http://www.ladyada.net/wiki/ 2009-11-17T16:38:37-05:00 http://www.ladyada.net/wiki/ http://www.ladyada.net/wiki/lib/images/favicon.ico text/html 2007-12-03T00:11:37-05:00 http://www.ladyada.net/wiki/x0x/accent?rev=1196658697&do=diff Definition (Wikipedia) In music, an accent is an emphasis placed on a particular note, either as a result of its context or specifically indicated by an accent mark. A tonic accent is an emphasis on a note by virtue of being higher in pitch than surrounding notes. An agogic accent is an emphasis by virtue of being longer in duration than surrounding notes. Dynamic accents are created when one note is louder than another. text/html 2007-12-03T00:11:37-05:00 http://www.ladyada.net/wiki/x0x/analogsynthesizer?rev=1196658697&do=diff The Analog Synthesizer The AnalogSynthesizer lives on the MainBoard and has five major sections. First off is the VoltageControlledOscillator, which takes an input from the DigitalSequencer, and creates a SquareWave or a SawWave from it. It then sends this waveform to the VoltageControlledFilter, which also takes an input from the EnvelopeGenerator to perform the LowPassFilter and Accent. After that it sends its signal to the VoltageControlledAmplifier, which also gets an input from the Envelop… text/html 2007-12-03T00:11:37-05:00 http://www.ladyada.net/wiki/x0x/avrprogram?rev=1196658697&do=diff abfasjklblasjkfbasklbfksbfklasbfklasbfjklbfasdjkbfjklasbfasdkl text/html 2007-09-20T17:47:18-05:00 http://www.ladyada.net/wiki/x0x/ba662asources?rev=1190324838&do=diff So far, most "sources" for BA662A chips that have been found online have not panned out. If you're convinced that you really need one (I used one and don't hear any positive difference), your best bet is probably to gut one from a dead or cheap synth that contains one. text/html 2007-12-03T00:11:38-05:00 http://www.ladyada.net/wiki/x0x/billofmaterials?rev=1196658698&do=diff Bill of Materials A "bill of materials", often abbreviated to BOM, is what it says: it is a list of materials, in this case it is the list of all components and parts in the kit. You can download a PDF version of the x0xb0x BOM here: Expanded Bill of Materials Thanks to control voltage for putting this together. text/html 2007-12-03T00:11:39-05:00 http://www.ladyada.net/wiki/x0x/bootloader?rev=1196658699&do=diff The Java Bootloader The Java-based Atmal bootloader software is JAvrProg, written by LadyAda. Once set up, it's very slick. Unfortunately, Java doesn't know how to work with serial ports out of the box, so you'll need to set it up first... Making the Bootloader Work This isn't the easiest process in the world to do, but if you are careful, you can make it go text/html 2007-12-03T00:11:39-05:00 http://www.ladyada.net/wiki/x0x/bypasscapacitors?rev=1196658699&do=diff What is a Bypass Capacitor? Bypass capacitor : A capacitor employed to conduct an alternating current around a component or group of components. Often the AC is removed from an AC/DC mixture, the DC being free to pass through the bypassed component. Essentially they remove any power fluctuations from an AC circuit. Generally a 0.1uF monolithic ceramic capacitor is used. For more information, see The Basics - Bypass Capacitors (The Encoder - The Newsletter of the Seattle Robotics Society) text/html 2007-12-03T00:11:39-05:00 http://www.ladyada.net/wiki/x0x/c0ntr0l?rev=1196658699&do=diff File Formats and Protocols * The x0xb0x PatternFileFormat * The x0xb0x SerialProtocol Application Internals * Main Structure * Globals - Contants and globals, and 2 functions hexToSignedInt and opj (which should be renamed) * main - The main window, sets up the ModelViewController. Taken from someones standard lib. * model - Very high level routines to talk to the serial * view - Handles the actual GUI * controller - performs application initialization (and teardown?) text/html 2007-12-03T00:11:39-05:00 http://www.ladyada.net/wiki/x0x/categorizingpages?rev=1196658699&do=diff Categorizing Pages All category pages start with CategoryBlah where Blah is the name of the category. Any time that you run into a page that is to be categorized, at the bottom of the page, you would add links to the relavent categories, like this: text/html 2007-12-03T00:11:40-05:00 http://www.ladyada.net/wiki/x0x/categorycategory?rev=1196658700&do=diff The Uber Category This is the Master Category Page. text/html 2007-12-03T00:11:40-05:00 http://www.ladyada.net/wiki/x0x/categorycircuit?rev=1196658700&do=diff CategoryTheory CategoryCategory text/html 2007-12-03T00:11:40-05:00 http://www.ladyada.net/wiki/x0x/categorycomponent?rev=1196658700&do=diff Electronic Components CategoryTheory CategoryCategory text/html 2007-12-03T00:11:41-05:00 http://www.ladyada.net/wiki/x0x/categoryfirmware?rev=1196658701&do=diff CategoryCategory text/html 2007-12-03T00:11:41-05:00 http://www.ladyada.net/wiki/x0x/categoryluminary?rev=1196658701&do=diff Category Luminary A list of important people to either the x0xb0x or the TB-303. CategoryCategory text/html 2007-12-03T00:11:41-05:00 http://www.ladyada.net/wiki/x0x/categorymods?rev=1196658701&do=diff x0xb0x Modifications CategoryCategory text/html 2007-12-03T00:11:41-05:00 http://www.ladyada.net/wiki/x0x/categoryopamp?rev=1196658701&do=diff CategoryTheory CategoryCategory text/html 2007-12-03T00:11:42-05:00 http://www.ladyada.net/wiki/x0x/categoryresistor?rev=1196658702&do=diff Resistance CategoryTheory CategoryCategory text/html 2007-12-03T00:11:42-05:00 http://www.ladyada.net/wiki/x0x/categorysemiconductor?rev=1196658702&do=diff Semi-Conductors CategoryComponent CategoryCategory CategoryTheory text/html 2007-12-03T00:11:42-05:00 http://www.ladyada.net/wiki/x0x/categorytheory?rev=1196658702&do=diff This is a good category to look into if you want to learn more about electronics in general. CategoryCategory text/html 2007-12-03T00:11:43-05:00 http://www.ladyada.net/wiki/x0x/categorywikitag?rev=1196658703&do=diff WikiTags on this wiki CategoryCategory CategoryMetaWiki text/html 2007-12-03T00:11:43-05:00 http://www.ladyada.net/wiki/x0x/componentguide?rev=1196658703&do=diff Component Guide Resistors The x0xb0x comes with a metric-fuck-tonne of resistors. These do not have to be soldered in any particular way (no polarity), and they are not heat sensitive. There are also 2 thermistors in the kit, which look really similar to the resistors, so be careful. text/html 2007-12-03T00:11:43-05:00 http://www.ladyada.net/wiki/x0x/cvprotection?rev=1196658703&do=diff CV Protection CV protection is something you have to be aware of when doing CV related mods. If your CV device outputs too high a voltage, or even a negative voltage, then the out-of-bounds input might just hose your x0xb0x. Here are a few ideas on how to deal with the problem. text/html 2007-12-03T00:11:44-05:00 http://www.ladyada.net/wiki/x0x/darlingtonpair?rev=1196658704&do=diff Darlington Pair A darlington pair is a pair of transistors that are connected together in sunch a way to provide a very high current gain. A darlington pair is made by tying together the collectors of two transistors, and the emitter of transistor 1 to the base of transistor 2. The Base of transistor 1 becomes the base for the pair, and the emitter of transistor 2 becomes the emitter of the pair. text/html 2007-12-03T00:11:44-05:00 http://www.ladyada.net/wiki/x0x/devilfish?rev=1196658704&do=diff Devil Fish The devilfish is a set of modifications to the original TB-303 performed by RobinWhittle of Real World Interfaces. The modifications apparently started with a few simple additions here and there, and it has grown to the point where the devilfish is almost its own instrument. RobinWhittle has said that he is not interested in performing the same modifications for an x0xb0x, which leaves us to figure out what they are, and how he did it for ourselves, which is half the fun. text/html 2007-12-03T00:11:44-05:00 http://www.ladyada.net/wiki/x0x/difficultyrating?rev=1196658704&do=diff Difficulty Rating Total Components: Heat Sensitive: Polarity: Originally difficulty rating was just going to be an estimate of how hard it would be to construct each section, however, with a little bit of math and common sense, we can probably come up with a better number. text/html 2007-12-03T00:11:45-05:00 http://www.ladyada.net/wiki/x0x/digitalsequencer?rev=1196658705&do=diff The Digital Sequencer The sequencer made up of 2 primary sections, the MicroProcessor and the IO system of the sequencer. The Microprocessor and EPROM Input Section Switches The input from the switches are sent to the 3 74hc165 ICs (IC16, IC17 and IC18) which are parallel to serial converters. The serial data is sent to the MicroProcessor via the SPL_OUT line. The output from IC16 is daisy chained to IC17, which is daisy chained to IC18. text/html 2007-12-03T00:11:45-05:00 http://www.ladyada.net/wiki/x0x/dinsync?rev=1196658705&do=diff The Din Sync Standard MidiAndSync The SYNC standard was developed by Roland as a way of syncronizing drum machines and sequencers. It has 2 main signals, "clock" and "star/stop". The signals are TTL compatible, so 0V is low, and +5V is high. It uses a cable like midi, but its pinout is different: text/html 2007-12-03T00:11:45-05:00 http://www.ladyada.net/wiki/x0x/diode?rev=1196658705&do=diff Diodes Diodes are made out of semiconductor material, and only conduct one way. CategoryTheory CategoryComponent CategorySemiConductor text/html 2007-12-03T00:11:45-05:00 http://www.ladyada.net/wiki/x0x/envelopefabrication?rev=1196658705&do=diff Pointers This section is pretty quick and easy to do, because there aren't that many components. Be careful to solder in the tantalum capacitor properly! If you accidentally put it in backwards, upon power-up you will have hosed your tantalum cap, and you will need to get a new one even if it seems to work just fine. Tantalum caps are prone to random failure if put in backward. text/html 2007-12-03T00:11:46-05:00 http://www.ladyada.net/wiki/x0x/envelopegenerator?rev=1196658706&do=diff Envelope and Gate Generator This circuit has 3 main parts, the Gate Circuit and the Envelope Generator and the Accent. The Envelope Generator is further subdivided into the VoltageControlledFilter envelope and the VoltageControlledAmplifier envelope text/html 2007-11-05T00:04:49-05:00 http://www.ladyada.net/wiki/x0x/envelopemods?rev=1194239089&do=diff Envelope Mods Gate On Forever Tie a line from the juncture of D35 and R133 to a single pole switch, and the other end to 12V. When the switch is on, the gate will be on forever, but the sound will still die when the main envelope closes the VCA. A good place to get 12V is pin 3 of J4 (pin 1 is 5.333v, pin 2 GND and pin 3 12v) text/html 2007-12-03T00:11:46-05:00 http://www.ladyada.net/wiki/x0x/envelopetesting?rev=1196658706&do=diff Testing the Envelope * Power up the main board by connecting J4 * Clip one end of an aligator clip to the south side of R146 (this provides the gate signal), and the other end to the exposed side of R3 on the IO board. * Check the voltage on the north side of D35. It should be 12V when the clip is connected, and 0V when it isn't. text/html 2007-12-03T00:11:47-05:00 http://www.ladyada.net/wiki/x0x/envmods?rev=1196658707&do=diff Accent Mods Increase Accent Range R46 and R119 control the depth of the accent. If you wanted a deeper accent, you could lower their values or replace them with jumpers. R119 controls the amplitude gain of the accent, and R46 controls the resonance gain. text/html 2007-12-03T00:11:47-05:00 http://www.ladyada.net/wiki/x0x/fabrication?rev=1196658707&do=diff Fabrication Starting Out Before you get your soldering iron out and start wreckin' stuff, there are a few things you should do: * Get a clean workspace! * Go through all of the parts, and make sure you have everything. Some of the LED standoffs (or other small components) might be stuck inside of the jacks. Check to make sure! Bicky has made a condensed BillOfMaterials in PDF format: . If you had the USB section pre-soldered, don't forget to count those soldered components! * Read… text/html 2007-12-03T00:11:47-05:00 http://www.ladyada.net/wiki/x0x/finishingitoff?rev=1196658707&do=diff Check polarity of electrolytics and transistors Even if you think you can be trusted to sit the right way on a toilet, you might not get all your electrolytic capacitors and transistors stuffed in the right way. Before you solder your jumpers together, it's worth quickly checking through all your polar components to make sure you haven't fluffed the positive and negative ends. It should only take you about 20 minutes at the most. text/html 2007-12-03T00:11:48-05:00 http://www.ladyada.net/wiki/x0x/finishingmods?rev=1196658708&do=diff Finishing Mods You can use a different case, even mount the x0xb0x in a rack enclosure and move the knobs and switches to the front panel of your rack! Some interesting mods and mod ideas have been: * FrontPanelMods * Spraypainting the black case silver * using a metal enclosure * replacing the knobs which classy silver ones text/html 2009-05-31T14:56:03-05:00 http://www.ladyada.net/wiki/x0x/firmware?rev=1243796163&do=diff x0xb0x Firmware If you want to upgrade your firmware, see the BootLoader section of the wiki. There are a set of modifications made to the firmware by the x0xb0x community, check em out at FirmWarePatches. There is also a wantlist/wishlist at FirmWareRequests. text/html 2007-12-03T00:11:48-05:00 http://www.ladyada.net/wiki/x0x/firmwaredevelopment?rev=1196658708&do=diff Firmware Development The Heavy Duty Option One option for firmware development (on windows) is to install WinAvr and Eclipse. Eclipse is a rather large, but featurefull IDE. It is also excellent for Java Programming (if you want to work on the BootLoader), and quite probably has a python package as well. text/html 2007-12-03T00:11:49-05:00 http://www.ladyada.net/wiki/x0x/firmwarehacking?rev=1196658709&do=diff Hacking the Firmware To get started on hacking the firmware, you will need some software first. See FirmWareDevelopment for install instructions. See the MicroProcessor page for a list of inputs/output ports. Files and Descriptions * compcontrol.c : ComputerControlMode * delay.c : Timer Helper functions * dinsync.c : * eeprom.c : * keyboard.c : KeyboardMode * led.c : * main.c : Main initialization and helper functions * midi.c : * pattern_edit.c : * pattern_play.c… text/html 2007-12-03T00:11:49-05:00 http://www.ladyada.net/wiki/x0x/firmwarepatches?rev=1196658709&do=diff Firmware Patches Son, in software, we call mods 'patches'. Use Rest, Accent & Slide buttons in a new way while playing and also get larger pitch range Daniel Araya has patched the firmware so that you can use the Rest, Accent & Slide buttons while playing a pattern and have the function on as long as you hold the buttons. The mod also increases the octave range to about 4 Octaves. He has provided another patch to increase the range of up to 6 Octaves, which apparently can do some "really … text/html 2007-12-03T00:11:49-05:00 http://www.ladyada.net/wiki/x0x/firmwarerequests?rev=1196658709&do=diff Firmware Wishlist Pattern Play Mode Pattern Rotate Rotate the pattern by single steps. Suggested Implementation: Hold down 'CHAIN' and hit 'PREV' or 'NEXT' to rotate the note in the sequence. Example: The pattern starts with the first note in the first step of the sequence, but after holding down 'CHAIN' and pressing 'NEXT' three times, the first note of the pattern is now in the fourth step of the sequence. text/html 2007-12-03T00:11:49-05:00 http://www.ladyada.net/wiki/x0x/fixme?rev=1196658709&do=diff Fix Me CategoryWikiTag text/html 2007-12-03T00:11:50-05:00 http://www.ladyada.net/wiki/x0x/frontpanelmods?rev=1196658710&do=diff Making BijouBitterSolies Panel x0xb0x #026 (BijouBittersolie) did an amazing front panel mod and created an amazing 303-like front panel.Here is a link to his TIF file. * Print out the TIF file on card stock * Cut out the holes for LED's, Switches and Knobs * Trim the sides, leaving 1 1/2 CM at the top and sides, and 2 CM at the bottom * Fold the exess at the bottom and sides over, and screw the top panel in * Revel in the beauty. text/html 2007-12-03T00:11:50-05:00 http://www.ladyada.net/wiki/x0x/gettingyourx0xb0x?rev=1196658710&do=diff Getting an x0xb0x Purchasing an x0xb0x is not like going down to your local Music Shop and buying a keyboard. First, you have to get on the waiting list, as there were only plans to do a run of 500. To get on the waiting list, send a message to <x0xb0x@gmail.com> and ask to be put on the waiting list. You should recieve a confirmation email at some point (give it at least a week or so). The time between being on the waiting list and having a kit in your hot little hands is roughly 3 months… text/html 2007-12-03T00:11:51-05:00 http://www.ladyada.net/wiki/x0x/hardtofind?rev=1196658711&do=diff Hard to find Parts Transistors * 2sa733p - TO-92 PNP * 2sc536f - TO-92 NPN * 2sk30AY - JFET * 2sk30AO - JFET * 2sc2291 - SIP matched pair with common base * 2sc1583 - SIP matched pair with common emitter ICs * AN6562 - Dual Operational Amplifier * LA4140 - Amplifier * ba6110 - VCA SIP * ba622a - VCA SIP - extremely rare, see Ba662aSources text/html 2007-12-03T00:11:51-05:00 http://www.ladyada.net/wiki/x0x/headphoneandmixer?rev=1196658711&do=diff Headphones and Mixer section This section is relatively simple. It taxes the incoming signal on the Mix In jack, and combines it with the x0xb0x signal. Then it is sent to Mix Out Jack. It is also sent to the headphone section, which is the LA4140, and support circutry. text/html 2007-12-03T00:11:51-05:00 http://www.ladyada.net/wiki/x0x/headphonefabrication?rev=1196658711&do=diff Headphone and Mixer Fabrication This section is pretty simple to solder, as there arent that many components. Testing this section is probably best done after you have the IO Board in place, because there are quite a few sections that you will need to power. text/html 2007-12-03T00:11:52-05:00 http://www.ladyada.net/wiki/x0x/headphonemods?rev=1196658712&do=diff Headphone and Mixer Mods Kill Switch on Headphone Amplifier The original TB-303 had a kill switch hooked up to the LA 4140 (Headphone Amplifier), which makes sense, because the LA44140 is the only draw of the +6Volt power. Modify Headphone Amplifier to Distortion Circuit This is entirely theoretical, but you might be able to change the circuit so that the LA 4140 can be used as a Distortion, and/or EQ circuit. text/html 2007-12-03T00:11:52-05:00 http://www.ladyada.net/wiki/x0x/headphonetesting?rev=1196658712&do=diff Testing the Headphone and Mixer Generally, this section is best tested when all the jumpers are attached. Headphone Testing Here is a list of voltages that should be seen on the LA4140. The best way to test it is to set the x0xb0x to random mode and the volume full up. Make sure you do not have headphones connected. text/html 2007-12-03T00:11:52-05:00 http://www.ladyada.net/wiki/x0x/highgaintransistors?rev=1196658712&do=diff The TB-303 generally used the 2SA733ap, which is a transistor with a gain of about 300-350. Unfortunately the 2SA733ap is no longer being manufactured, so LadyAda used the 2SA733p, which for the most part is a drop in replacement. However, in applications where the transistor gain is important, like shaping the Square in the VoltageControlledOscillator, or converting the voltage to current for the VoltageControlledFilter the gain is very important. text/html 2007-12-03T00:11:53-05:00 http://www.ladyada.net/wiki/x0x/ioboard?rev=1196658713&do=diff IoBoard Contains the MidiAndSync and PowerSupply Schematic <http://wiki.jonnay.net/_media/x0x/ioboardschematic.png> text/html 2007-12-03T00:11:53-05:00 http://www.ladyada.net/wiki/x0x/jumpers?rev=1196658713&do=diff Jumpers 3 Wire Jumpers Jumper Pin1 Pin2 Pin3 J4 5.333V GND 12V J5 Headphone GND 6V J6 CV GND Gate J7 Mix Out GND Mix In The 12 Wire Jumper Pin Signal 1 USB TX 2 USB RX 3 +5 V 4 +5 V 5 Midi In 6 Midi Out 7 GND 8 GND 9 Din Sync 4 10 Din Sync 3 11 Din Sync 2 12 Din Sync 1 text/html 2007-12-03T00:11:53-05:00 http://www.ladyada.net/wiki/x0x/ladyada?rev=1196658713&do=diff Along with TheGerman, she has created the x0xb0x. A very busy individual, with too much cool shit on her plate. <http://ladyada.net/> <http://ladyada.net/make/> has all her other cool projects: * x0xb0x, of course * MIDIsense, a real-world MIDI interface platform * Spoke POV, an LED image display for the wheels of your bike * Mini POV, another Persistance of Vision toy for displaying text * MintyMP3, a Flash MP3 player that fits in an Altoid tin * Game Grrl, an old school Nintend… text/html 2007-12-03T00:11:53-05:00 http://www.ladyada.net/wiki/x0x/lowpassfilter?rev=1196658713&do=diff Definition (Wikipedia) A low-pass filter is a filter that passes low frequencies well, but attenuates (or reduces) frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter. It is sometimes called a high-cut filter, or treble cut filter when used in audio applications. text/html 2007-12-03T00:11:54-05:00 http://www.ladyada.net/wiki/x0x/main.c?rev=1196658714&do=diff main.c Lots of different functions in here: do_tempo This is essentially a software interupt. A huge function with a big fat case statement in it. Handles note playing, amongst other things. Signals Output Compare Handles sync and tempo. Deals with DinSync and Midi Sync. text/html 2007-12-03T00:11:54-05:00 http://www.ladyada.net/wiki/x0x/mainboard?rev=1196658714&do=diff Main Board Contains The following Sections: * VoltageControlledOscillator * VoltageControlledFilter * VoltageControlledAmplifier * EnvelopeGenerator * GateCircuit * HeadphoneAndMixer Amplifier. * ATmega162Microcontroller * DigitalInputAndDisplayOutput text/html 2007-12-03T00:11:54-05:00 http://www.ladyada.net/wiki/x0x/makingitatrueclone?rev=1196658714&do=diff Making the x0xb0x a true Clone The x0xb0x is a very close clone. For the synthesizer section almost every capacitor, resisitor, IC, and transistor are exactly the same with the TB303. Some substitutions have needed to be made. The x0xb0x diverges from the TB303 in 2 major sections. The PowerSupply and the DigitalSequencer. text/html 2009-04-14T22:48:02-05:00 http://www.ladyada.net/wiki/x0x/manual?rev=1239763682&do=diff Here is the latest version of the manual, in InDesign format: [x0x Manual] This adobe illustrator template may come in handy: [x0xlayout template] text/html 2007-12-03T00:11:55-05:00 http://www.ladyada.net/wiki/x0x/microprocessor?rev=1196658715&do=diff The Microprocessor The processor of the x0xb0x is an ATmega162 microcontroller. There is a great site called AVR Freaks which appears to be for all things AVR. The datasheet for the ATmega162 is available Here: . In depth documentation is available here: text/html 2007-12-03T00:11:55-05:00 http://www.ladyada.net/wiki/x0x/midiandsync?rev=1196658715&do=diff IO Board Most of it is pretty simple. A block diagram would be redundant, as it would show inputs leading to outputs, with exception to the USB, where it goes through the USB chip first. Mix In/Out and Gate/CV Out These are pretty simple. Mix In and Out both me through J7 and are connected directly to their respective jacks. CV and gate come thorugh J6, and again, are connected directly to their respective jacks. text/html 2007-12-03T00:11:55-05:00 http://www.ladyada.net/wiki/x0x/midiplay?rev=1196658715&do=diff ra text/html 2007-12-03T00:11:56-05:00 http://www.ladyada.net/wiki/x0x/midisyncfabrication?rev=1196658716&do=diff Midi, USB and Sync Section Fabrication USB Section The USB section contains a surface mount chip. If you are at all unsure about soldering SMD parts, then you can get your x0xb0x built with the USB section built and tested for you for an extra 25 bucks. This is a good idea! text/html 2007-12-03T00:11:56-05:00 http://www.ladyada.net/wiki/x0x/midisyncmods?rev=1196658716&do=diff IO Board Mods Because of the relative simplicity of this section, there isn't much in the way of mods to be done here. Change Midi Out to Another Midi Thru VerifyMe: Cut the trace to pin 5, and wire it up a 220 Ohm resistor to the Collector of Q50 text/html 2007-12-03T00:11:56-05:00 http://www.ladyada.net/wiki/x0x/midisynctesting?rev=1196658716&do=diff Testing the USB, Midi, Sync, CV and Audio Connections Testing the USB * Power the IO board, but don't connect it to the main board * Plug in the USB into a computer. * If you are using Windows, The computer should detect a "Serial <-> USB" chip and request a driver. * If you are using OSX or Linux, .... WorkOnMe text/html 2007-12-03T00:11:57-05:00 http://www.ladyada.net/wiki/x0x/modelviewcontroller?rev=1196658717&do=diff Model-View-Controller The x0x c0ntr0l application employs the model-view-controller (MVC) paradigm for application design. This three tier approach seperates the graphical user interface (the view) from the mechanics of the application such as the serial ports, data storage on disk and application logic (the model). The controller is the interface between the object and the view. Messages between the model and view must pass through the controller. These messages must adhere to the specifi… text/html 2007-12-03T00:11:57-05:00 http://www.ladyada.net/wiki/x0x/mods?rev=1196658717&do=diff x0xb0x modifications If you want to get into modding your x0xb0x, having a good idea of what is going on inside the guts is a good idea. Check the SchematicOverview and all of the subsections for more information. If you want to just perform the mods like a cookbook, you can probably do that too, but you might get hosed if something goes wrong! If you have performed a mod, feel free to write about your reactions, any problems you have (or had) and any pointers on how to do it. text/html 2009-03-25T15:37:23-05:00 http://www.ladyada.net/wiki/x0x/momerath?rev=1238009843&do=diff User: <http://www.ladyada.net/forums/memberlist.php?mode=viewprofile&u=296> text/html 2007-12-03T00:11:57-05:00 http://www.ladyada.net/wiki/x0x/noninvertingamplifier?rev=1196658717&do=diff Non Inverting Op Amp A non-inverting Op Amp provides a gain in voltage. (a better explination goes here). The Gain in voltage is determined by 1 + (R2 / R1). |\ o----|+\ | \ +---|- /----+-----o | | / | | |/ \ | / R2 | \ +-----------+ / \ R1 / | --- GND This is used in the PowerSupply to boost the 5.333 voltage to a voltage of 11.851 (roughly 12 volts) text/html 2007-12-03T00:11:57-05:00 http://www.ladyada.net/wiki/x0x/oneminutewiki?rev=1196658717&do=diff One Minute Wiki What is a Wiki? A wiki is a piece of software, usually on a website that does (at least) 2 things: * Allows anyone to add, edit or delete pages * Makes it easy to create links between pages What is this Wiki? This wiki is devoted to the discussion of all facets of the x0xb0x, a Do It Yourself Synthesizer based on the TB-303. It also branches out into the general areas of electronics and music. For more information, see WikiMission. text/html 2007-12-03T00:11:58-05:00 http://www.ladyada.net/wiki/x0x/parallelresistor?rev=1196658718&do=diff Resistors In Parallel When resistors are in parallel, their total resistance is diminished. The formula for figuring out the resistance is: 1 R(total) = -------------------------------- ((R1 / 1) (R2 / 1) ... (Rn / 1)) A good calculator is available here: <http://www.1728.com/resistrs.htm> text/html 2007-12-03T00:11:58-05:00 http://www.ladyada.net/wiki/x0x/pattern_play.c?rev=1196658718&do=diff Pattern Play Mode Initialization (fill in here) Pattern Play Loop The pattern play loop looks like this: * Read any input from the switches * If the function has changed, stop and exit * If we are in master sync mode, handle tap tempo * Start a new chain if the chain key was just pressed * Finalize chain mode once chain is released * Display Somthing... * If we are in the middle of chain mode, then display the current chain and add patterns/tracks OR * If up/down is pres… text/html 2008-11-07T22:25:50-05:00 http://www.ladyada.net/wiki/x0x/patternfileformat?rev=1226114750&do=diff x0xb0x pattern file (*.xbp) (version 100) This information can be used to put the pattern back in EEPROM in the location where it was originally stored. Optionally, this information can be ignored, or set to the NULL bank/pattern (0, 0) if no bank/location info is available. text/html 2007-12-15T21:56:27-05:00 http://www.ladyada.net/wiki/x0x/playing?rev=1197773787&do=diff Make your x0xb0x sing, Make your x0xb0x scream. For information on how to get the best sounds out of your x0xb0x, see UsingTheSynth. For information on how the sequencer works, see UsingTheSequencer. Modes of Operation The x0xb0x has 7 major modes of operation, plus 3 "user" modes of operation which, if you are willing to hack the FirmWare, you can make it do whatever you like. text/html 2008-04-14T01:11:20-05:00 http://www.ladyada.net/wiki/x0x/powersupply?rev=1208149880&do=diff The Power Supply The power supply is relatively simple to understand. The power comes in at 9V AC, and goes to the rectifier From here, it is split into 2 sections The 5V and 6V, and the 12V and 5.333 Volt. At each section there are SmoothingCapacitors and ByPassCapacitors. text/html 2007-12-03T00:11:59-05:00 http://www.ladyada.net/wiki/x0x/psfabrication?rev=1196658719&do=diff Power Supply Fabrication The power supply is the most important part of the x0xb0x. Take your time and do this right! If you get stuck, download the schematic, and follow along with the PowerSupply page so you can understand what the circuit is doing. This will give you an idea of what went wrong where. text/html 2008-05-24T03:06:56-05:00 http://www.ladyada.net/wiki/x0x/psmods?rev=1211612816&do=diff Power Supply Mods On / Off Switch Basically Trivial. Locate the power jack. On the solder side of the I/O-board, cut the trace that almost circles the jack between the first two solder pads. Refer to this picture. Solder the wires leading to your switch as shown here. Find a good place on your I/o panel to mount the switch. Before drilling your precious panel make sure the switch doesnt stick out too much or the 2200uf caps on the I/O-board might get in the way! text/html 2007-07-30T01:22:56-05:00 http://www.ladyada.net/wiki/x0x/pstesting?rev=1185772976&do=diff Testing The Power Supply Most of the testing should have happened along with the building of the power supply. ----- PSU: Test that the voltage across the jack terminals is roughly 12V AC. Note that it could be as low as 10, or as high as 14. The voltage across each capacitor should be about 15 Volts DC. Again, this has give. - Finally test that the voltage across the middle pin of where IC20 will go, and the left pin (with the white dot) is higher then 8V DC. (probably around 13, but Your… text/html 2007-09-04T00:35:32-05:00 http://www.ladyada.net/wiki/x0x/rareparts?rev=1188880532&do=diff These are the ultra-rare parts that you may have problems getting. I suggest searching eBay, Octopart.com/Findchips.com, Google, etc. for them. Good luck! You'll need two of these dual op amps. They are hard to get, but you can probably substitute a LM358 or any other rail-to-rail opamp that can go up to 30V input. text/html 2007-12-03T00:12:00-05:00 http://www.ladyada.net/wiki/x0x/refactorme?rev=1196658720&do=diff Refactor Me This is a WikiTag to show that a particular piece of content needs to be changed to fill it out or make it better. The term "refactor" comes from Computer Science. Here is a list of all of the pages that need 'refactoring': CategoryWikiBadge text/html 2009-03-25T20:34:48-05:00 http://www.ladyada.net/wiki/x0x/replacementparts?rev=1238027688&do=diff For replacement/substitute parts, see this forum topic ---------- Here's some results distilled down for ya... ---------- LadyAda ships with these replacements, with no noticeable sound differences * 733p instead of 733ap * BA6110 instead of BA662a text/html 2007-12-03T00:12:01-05:00 http://www.ladyada.net/wiki/x0x/robinwhittle?rev=1196658721&do=diff Creator of the DevilFish a set of modifications to the TB-303, that make the thing a whole new instrument. CategoryLuminary text/html 2007-12-03T00:12:01-05:00 http://www.ladyada.net/wiki/x0x/sawwave?rev=1196658721&do=diff Basic Definition (Wikipedia) The sawtooth wave (or saw wave) is a kind of basic non-sinusoidal waveform. It is named a sawtooth based on its resemblance to the teeth on the blade of a saw. The usual convention is that a sawtooth wave ramps upward as time goes by and then sharply drops. However, there are also sawtooth waves in which the wave ramps downward and then sharply rises. The latter type of sawtooth wave is called a 'reverse sawtooth wave' or 'inverse sawtooth wave'. The 2 orientat… text/html 2007-12-03T00:12:01-05:00 http://www.ladyada.net/wiki/x0x/schematicoverview?rev=1196658721&do=diff An overview of the Schematic There are 3 major sections to the x0xb0x. The PowerSupply, the analog synthesizer and the DigitalSequencer. The PowerSupply lives on the IoBoard takes the ~9 volt AC power, splits it into two sections. One of them rectifies it to 5 volts and 6 volts, the other section references it to 5.333 volts, and doubles it to 12 volts. text/html 2007-12-03T11:36:52-05:00 http://www.ladyada.net/wiki/x0x/schematicoverviews?rev=1196699812&do=diff An overview of the Schematic There are 3 major sections to the x0xb0x. The PowerSupply, the analog synthesizer and the DigitalSequencer. The PowerSupply lives on the IoBoard takes the ~9 volt AC power, splits it into two sections. One of them rectifies it to 5 volts and 6 volts, the other section references it to 5.333 volts, and doubles it to 12 volts. text/html 2007-12-03T00:12:01-05:00 http://www.ladyada.net/wiki/x0x/sequencerfabrication?rev=1196658721&do=diff Building the Sequencer This section is not particularly difficult, but it is long. There are a lot of resistors, leds and switches. Also, be sure to put your eprom and MicroProcessor in after you finish soldering. Don't forget about the 2 Jumpers J1 and J2. They are not the wires to staple the rotary switches. text/html 2007-12-03T00:12:02-05:00 http://www.ladyada.net/wiki/x0x/sequencermods?rev=1196658722&do=diff Sequencer Mods Note, that to change the behavior of the sequencer, you are not going to be getting your soldering iron out, rather, you are going to be starting up your favorite text editor and brushing up on your C skills. See FirmWarePatches for sequencer behavior modifications. text/html 2007-12-03T00:12:02-05:00 http://www.ladyada.net/wiki/x0x/sequencertesting?rev=1196658722&do=diff Testing the Sequencer Testing the sequencer is best done when you have everything together, then you can just hit a key in keyboard mode, and make sure that it plays a sound. Troubleshooting Some leds don't light up, and others light up twice as bright Sometimes when soldering the resistors for the LEDs, you can either short out the resistors by having their leads touch or by having a solder bridge. If this happens, then you will run across the problem of intermittent led lighting on some… text/html 2007-12-03T00:12:03-05:00 http://www.ladyada.net/wiki/x0x/serialprotocol?rev=1196658723&do=diff SERIAL PROTOCOL A serial packet between the x0xb0x and the c0ntr0l application is composed of the following parts: Header ; Type (1 byte) : The type of message; e.g. read pattern, write pattern, etc. ; Size (2 bytes) : the size of the _body_ of the message. Can be 0 if the message has no arguments and no data. Body ; Body (N bytes) : The body of the message contains command arguments or command data (e.g. a 303 pattern), both, or sometimes neither. The number of bytes contained in the b… text/html 2007-12-03T00:12:03-05:00 http://www.ladyada.net/wiki/x0x/shippingcosts?rev=1196658723&do=diff Shipping, Taxes and Tarrifs When you get your x0xb0x, you might be hit with extra taxes and tarrifs, depending on the point of delivery. This should only be a rough guide as to what the extra costs are. When posts are added to the Actual Cost Thread They should be added here. text/html 2008-08-09T21:56:26-05:00 http://www.ladyada.net/wiki/x0x/sipsocket?rev=1218333386&do=diff SIP Socket Single In-Line Plastic Socket Examples include Mouser Electronics #571-1-1571994-0 (Tin contacts)Tyco Electronics/AMP #1-1571994-0 and #506-510-AG90D (gold contacts) Tyco Electronics/AMP #2-1437530-8. text/html 2007-12-03T00:12:03-05:00 http://www.ladyada.net/wiki/x0x/smoothingcapacitors?rev=1196658723&do=diff Smoothing Capacitors Smoothing Capacitors are ByPassCapacitors on crack. They are generally very large value elecrolytic capacitors. They take rectified voltage, and smooth it out. The capacitor gets charged on the rising voltage of the rectified output, and when the voltage starts to drop the capacitor discharges, ensuring that there isn't a big voltage drop. text/html 2007-12-03T00:12:04-05:00 http://www.ladyada.net/wiki/x0x/squarewave?rev=1196658724&do=diff Basic Definition (Wikipedia) A square wave is a basic kind of non-sinusoidal waveform encountered in electronics and signal processing. An ideal square wave alternates regularly and instantaneously between two levels, which may or may not include zero. text/html 2009-03-25T20:17:24-05:00 http://www.ladyada.net/wiki/x0x/subatomic?rev=1238026644&do=diff User: <http://www.ladyada.net/forums/memberlist.php?mode=viewprofile&u=103> text/html 2007-12-03T00:12:04-05:00 http://www.ladyada.net/wiki/x0x/tb-303?rev=1196658724&do=diff The TB-303 It's just a shitty monosynth. The TB-303 is an analog monosynth released by Roland in the early '80s. It was originally made to emulate a bass player. A guitarist would purchase the TB-303 along with the TR-606 (a drum machine), and (so the theory goes) they would not need a band for any practice. As it turns out, it was particularly bad at emulating a bass player. text/html 2007-12-03T00:12:04-05:00 http://www.ladyada.net/wiki/x0x/tb303x0xb0xdifferences?rev=1196658724&do=diff Differences between the TB-303 and the x0xb0x Power Supply The x0xb0x power supply is a lot stiffer then the TB-303. The TB-303 can also run off of batteries, and disconnects the 6V power supply when the headphone jack is not in use. The stiffness of x0xb0x power supply does actually affect the ability to accurately reproduce the TB-303, because sometimes the TB-303's supply would be loaded down, introducing a resonance warble. These two issues are dealt with in the PsMods section. text/html 2007-12-03T00:12:05-05:00 http://www.ladyada.net/wiki/x0x/templates?rev=1196658725&do=diff Templates Here is a list of templates that we use on the x0xd0x wiki. For a bigger explination of templates, see templates. To use a template, insert this into your wikipage: {{template>.templates:templatename}} * fabmenu - Fabrication/Testing/Schematic menu * fabinfo - Fabrication Information. See FabInfoHelp * schema - Schematic Information. See SchemaHelp text/html 2007-12-03T00:12:05-05:00 http://www.ladyada.net/wiki/x0x/testing?rev=1196658725&do=diff Testing and troubleshooting the x0xb0x What you need for testing The bare minimum that you will need to test your x0xb0x is: * a multimeter (digital works best) * 2 Double A batteries * aligator clips * High impedance (cheap) headphones text/html 2007-12-03T00:12:05-05:00 http://www.ladyada.net/wiki/x0x/thegerman?rev=1196658725&do=diff The German is a secretive fellow. Some people claim that, as a child, he was permanently disfigured via a tragic accident involving 10-Molar hydroflouric acid in high school chemistry class. His face & voice destroyed, The German retreated deep underground to a secretive lair where he spent a decade perfecting his "ZochsMaschine": an electronic device that would allow him to communicate with the outside world and fully express his dreams and desires. text/html 2007-12-03T00:12:06-05:00 http://www.ladyada.net/wiki/x0x/transistor?rev=1196658726&do=diff Transistors There are 3 major types of transistors used in the x0xb0x: * NpnTransistor * PnpTransistor * JfetTransistor For an explination of how each transistor works, please visit its page. CategoryTransistor CategoryTheory text/html 2007-12-03T00:12:06-05:00 http://www.ladyada.net/wiki/x0x/transistorbetatest?rev=1196658726&do=diff text/html 2007-08-15T23:36:18-05:00 http://www.ladyada.net/wiki/x0x/transistors?rev=1187235378&do=diff I beta-tested a bunch of 2SC2291's since it seems like their time on this earth is very close to the end. These were all tested with Ice = 1mA and Vce = ~10V. It's not a precision setup but it is consistent. Transistor "name" Datecode Beta 1 Beta 2 Matching NTE44 #1 None (sanded off) 513 500 1.03 NTE44 #2 None (sanded off) 520 528 0.98 NTE44 #3 None (sanded off) 365 373 0.98 NTE44 #4 None (sanded off) 493 496 0.99 NTE44 #5… text/html 2007-12-03T00:12:06-05:00 http://www.ladyada.net/wiki/x0x/usermode?rev=1196658726&do=diff These modes are apparently for future expansion. In the 1.04 firmware, only User Mode A appears to be functional. User Mode A Same functionality as pattern edit mode, but synced to MIDI in only (reportedly not with DIN Sync - check the 1.04 update thread for more info). text/html 2007-12-03T00:12:06-05:00 http://www.ladyada.net/wiki/x0x/usingthesynth?rev=1196658726&do=diff Using the Synthesizer Generally using the synthesizer isn't that difficult. It is just a shitty little monosynth after all... or so you might think! The TB-303 and by extension, the x0xb0x, have some interesting little quirks that affect what kind of sound that you can get out of it. text/html 2007-12-03T00:12:07-05:00 http://www.ladyada.net/wiki/x0x/vcafabrication?rev=1196658727&do=diff Building the Voltage Controlled Amplifier Most of the components are pretty straightforward, with a few exceptions. As usual Solder in the Potentiometer in last. Take care with the polarity of the Tantalum capacitor, putting this component in wrong is not fun. Finally, there is the question of the BA6110/BA622A. The x0xb0x ships with a BA6110, because the BA662A is no longer built by the manufacturer. You are probably going to want to mount this on a SIP socket. Some people claim that th… text/html 2007-10-20T02:05:26-05:00 http://www.ladyada.net/wiki/x0x/vcamods?rev=1192860326&do=diff VCA Mods Bass Boost Mod This mod is absolutely essential if you want your x0xb0x to be a bassline machine. It is a really good one to make! Change C21 and C20 from .01uF to .1uF. Some people have found that it gets too boomy if you use your x0xb0x for more of a lead sound, but you can either make it switchable or roll off the bass on your eq. text/html 2007-12-03T00:12:07-05:00 http://www.ladyada.net/wiki/x0x/vcatesting?rev=1196658727&do=diff Testing the Voltage Controlled Amplifier * Connect power from the IO board and provide 2.0VDC to R90, as before. * In a quiet room, connect up a pair of low-fi (32ohm or greater impedance) headphones as before: ground the sleeve (the mid pin of j4 is a good ground), and use the tip for probing. Touch the tip to rightmost pin (the one that is not connected to the ground plane) of where the volume potetiometer VR8 will go. * Connect up an alligator clip as it was for testing the gate (clipp… text/html 2007-12-03T00:12:08-05:00 http://www.ladyada.net/wiki/x0x/vcffabrication?rev=1196658728&do=diff Pointers Make sure you don't get the five pin transistors confused when building this section. There is one 2SC2291, and two 2SC1583 transistors. Also, the picture of the completed VCA on the main fabrication page is wrong, C23 is backwards. text/html 2008-05-20T19:03:11-05:00 http://www.ladyada.net/wiki/x0x/vcfmods?rev=1211324591&do=diff Filter Mods Perhaps this page could be split out into a grouping of pages soon. Filter Modulation (VCO) This is another relatively easy but awesome mod for the 303. Take the feed from the square wave (R36/Q8) and the saw wave (R105/Q28) and wire one to pin3 of an SPDT switch and the other to pin1 of the same switch. Use a SPDT switch so that you can select the saw or square wave as the modulation source. Connect pin2 from the switch to the 3rd leg of a 50K log External Linkpot. Wire the fir… text/html 2008-03-29T07:28:57-05:00 http://www.ladyada.net/wiki/x0x/vcftesting?rev=1206790137&do=diff Testing and Calibrating the VCF Testing * Re-attach the power supply (with J4) * Apply 3volts to R90 (either with 2 AA batteries or a benchtop supply) * Probe the resonance pot with either a cheap pair of headphones or your oscilloscope. With the cutoff all the way anti-clockwise, you should see mostly a sinewave. If you're probing with headphones, you should hear a low, soft tone. When you turn the cutoff up, you should see a waveform similar to the one you have selected on the VCO. … text/html 2007-12-03T00:12:09-05:00 http://www.ladyada.net/wiki/x0x/vcofabrication?rev=1196658729&do=diff Pointers Be careful, there are 4 different kinds of transistors on this circuit. Make sure you get the right one in the right place. After you build the VCO, it is a good idea to Test the circuit after you build it, this will make tesitng (and troubleshooting, if you have to) the other sections much easier. text/html 2007-09-30T17:28:08-05:00 http://www.ladyada.net/wiki/x0x/vcomods?rev=1191187688&do=diff Voltage Controlled Oscillator Mods Better Square By using a high beta transistor at Q8, you can get a much more TB303-like square. This is because the original 303 used high gain 2SA733ap transistors which are no longer being produced. The x0x0b0x comes with 2SA733p transistors, which are close, but have less gain. For more information on the transistors, see HighGainTransistors text/html 2007-12-03T00:12:10-05:00 http://www.ladyada.net/wiki/x0x/vcotesting?rev=1196658730&do=diff Testing the VCO To properly test the VCO, you need to do 2 things. 1 generate a CV signal, and 2 check the waveform. This can be done with multi-thousand dollar waveform generators and oscilloscopes or with 2 AA Cell batteries taped together and a cheap pair of headphones. text/html 2007-12-03T00:12:10-05:00 http://www.ladyada.net/wiki/x0x/verifyme?rev=1196658730&do=diff Pages that need Verification This page contains a list of all WikiPages that need to have their contents verified by someone who is competent with electronics. If you feel you can contribute, pick one of the pages below and have a look. If the information is correct, remove the VerifyMe message. If the information is incorrect, either do what you can to correct it (this could be hard) or update the content with a little message saying that it is wrong (this is easy). text/html 2009-04-06T16:48:57-05:00 http://www.ladyada.net/wiki/x0x/voltagecontrolledamplifier?rev=1239050937&do=diff Voltage Controlled Amplifier WorkOnMe BA6110 Pinout The BA6110 comes in SIP and DIP (BA6110FS) packages. The x0xb0x ships with the SIP version, but the DIP pinout is provided for reference in case you need to replace it, and you can't find the SIP. text/html 2007-10-05T15:08:56-05:00 http://www.ladyada.net/wiki/x0x/voltagecontrolledfilter?rev=1191611336&do=diff Voltage Controlled Filter There are 4 major sections to the Tb303's VCF. It is a unique 4 pole diode ladder filter (the diode ladder was an invention of Bob Moog's) which gives the response of a 3 pole filter. You might be wondering however, where all the diodes went. Apparently you can wire up transistors to act like diodes, and this is what is going on here. You can view the Patent for Bob Moog's ladder filter here: text/html 2007-09-30T14:58:39-05:00 http://www.ladyada.net/wiki/x0x/voltagecontrolledoscillator?rev=1191178719&do=diff The Voltage Controlled Oscillator The VCO is comprised of 5 sections. The first of which is the Digital to Analog converter, which takes the digital signals for the note generated by the MicroProcessor and converts them to a voltage. After that the voltage is sent to a buffer and the Slide Circuit. Then it is sent to Q26 which is responsible for (blah... marked as "antilog" on the Tb303 block schematic). Q25 and Q27 act as a special switch, which is based on a Silicon Controlled Rectifier … text/html 2007-12-03T00:12:11-05:00 http://www.ladyada.net/wiki/x0x/voltagefollower?rev=1196658731&do=diff Voltage Follower The voltage follower (also called a buffer) is a basic application of an OpAmp. It provides a high input impedance, a low output impedance and unity gain. So the voltage in is the same as the voltage out. |\ o--|+\ | \ +-|- /----+-----o | | / | | |/ | +---------+ CategoryTheory CategoryOpAmp CategoryCircuit text/html 2007-12-03T00:12:12-05:00 http://www.ladyada.net/wiki/x0x/whatthehelltodowiththeothertransistors?rev=1196658732&do=diff So you just purchased 100 transistors from Mouser to find some HighGainTransistors. Now you have a wack of them left. What now? Here are some ideas: * Build a distortion circuit. * Build another Low Pass Filter * Build a microprocessor ;) * That would be a macroprocessor! text/html 2009-05-31T14:50:27-05:00 http://www.ladyada.net/wiki/x0x/wikimission?rev=1243795827&do=diff Wiki Mission This wiki started out as a way for Jonnay to post various things that he has learned about the x0xb0x hardware, firmware and software. In its original form, it was a tiddly wiki which was only editable on his machine. He decided to open up the wiki to the internet, and it has grown since them to become this wiki. text/html 2007-12-03T00:12:13-05:00 http://www.ladyada.net/wiki/x0x/wikitodo?rev=1196658733&do=diff Let's Build Us A Garden There is lots of stuff that you can do to help the x0xd0x wiki grow, whether you are a seasoned electronics expert, or a beginning musician who wants to learn how to solder. There is something for everyone. The point of this wiki is to explain everything x0xb0x. From the Fabrication, Testing, Modding and Playing, to the internal guts of the Hardware, FirmWare and SoftWare. text/html 2007-12-03T00:12:13-05:00 http://www.ladyada.net/wiki/x0x/workonme?rev=1196658733&do=diff Work On Me This is a designator that the page needs to have more information in it. CategoryWikiTag text/html 2009-04-14T22:41:43-05:00 http://www.ladyada.net/wiki/x0x/x0xd0x?rev=1239763303&do=diff x0xd0x This is a wiki about the x0xb0x, a DIY analog synth built by LadyAda of Adafruit Industries. Technical Information SchematicOverviewsPowerSupplyAnalogSynthesizerVoltageControlledOscillatorVoltageControlledFilterEnvelopeGeneratorVoltageControlledAmplifierHeadphoneAndMixerDigitalSequencerMidiAndSyncTransistors FirmWareBootLoaderC0ntr0l