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 on: May 14, 2022, 01:18:01 PM 
Started by littleghost - Last post by littleghost
I’m sure many here have noticed the sudden disappearance of several circuit bending sites in recent years. It seems like every month, another old bending forum or blog goes offline. Many of these sites have been around for over a decade, and with their closure comes the loss of thousands of posts, schematics, diagrams, and other priceless info accrued by the bending community. Even community giants like GetLofi and Casper Electronics have 404ed recently.

In an effort to try and preserve the resources that still exist, we’ve started the Circuit Bending Wiki!

So, what is it?

The circuit bending wiki has 3 simple goals;

  • To act as a static place for the community to preserve existing info on bending before its gone, in a way that is centralized, collaborative, & easy navigable
  • To also act as a place for benders to share new info (tips, findings, build notes, etc) on specific devices as well as techniques & concepts
  • To create an extensive archive of service manuals, chip pinouts, and other technical documents relevant to circuit benders

How does it work?

Each device has its own dedicated article, where info related to that device can be posted. Lets use the CB Wiki’s article on the Casio SK-1 as an example. The article has a “Documentation” section, containing manufacturer documents like the service manual & chip pinouts. There’s also a “Community Documentation” section, where users can share info related to circuit bending like schematics, bend points, build notes, etc.

We don’t have an article for every commonly-bent device yet, but we hope to eventually. We’re building them as we go, and it’s up to the community to help make this Wiki the powerful resource it has the potential to be. If we’re missing an article for a device you’d like to see, feel free to create one!

Aside from the device articles, there’s also our catalog of service & operation manuals, which we hope to expand with the help of the community. As well as our “List of Resources”, a list of sites with valuable info for benders. We’re also hoping to have a list of common sound chips & pinouts created soon as well.

How do I contribute?

First and foremost, editing is open to all.

If you have any files you’d like to archive or share (manuals, schematics, images of bend points, circuit diagrams, etc), you can upload them to the Wiki HERE. After which they’ll be available on our “Files List”. page until someone can integrate them into articles.

If you’d like to contribute an article, visit our ”Planned Articles” page to see what we have on our to-do list. Our page on the SK-1 is meant to serve as a template for creating new articles, to make the process quick & easy.

Any suggestions for articles can also be added to the “Planned Articles” page.

If anyone has any questions, feel free to pose them in the replies, and we hope to see you over on the Wiki! Here’s hoping this is the start of a new, powerful resource for the community.

 on: March 27, 2022, 05:07:48 PM 
Started by iwillbeacircuitbender - Last post by iwillbeacircuitbender
Okay, so do you guys know about this site. This has ROM dumps of alesis systems, yamahas, and others. Here is the link to it:

 on: February 13, 2022, 05:33:47 PM 
Started by flyagaricus - Last post by flyagaricus
I have to connect a few more patch points internally, but this project is pretty much complete. My first bend  :)

 on: January 23, 2022, 03:11:09 AM 
Started by slayerz - Last post by channelite
I did a test with a 9v dc and 12v dc power adaptor powering the cb55 and the 12v makes the cb55 louder. The 9v still works, just has a lower volumes.  If that info is useful to you...

 on: January 22, 2022, 05:22:24 PM 
Started by Circuitbenders - Last post by slayerz
I think there might be a mistake in the build guide, isn't pin 1 on TRIG_IN2 the snare and not the hat? I get a snare on pin 1 and a hat on pin 2, so I looked at the schematic and it looks like it's going to the snare. Also, pin 3 on TRIG_IN1 (snare) leads to pin 1, so I think that reaffirms it?

 on: January 22, 2022, 05:16:19 PM 
Started by slayerz - Last post by slayerz
I use the Olegtron 4060 with the CB55, which has a power starve knob. Starving the power causes the CB55 to get distortion or unexpected sounds, which is kind of cool.  When there is no starving, which the normal gates are send from the Olegtron, the CB55 sounds normal.

Thanks, but I don't mean to actually use a lower voltage to trigger - I want to modify the trigger conditioning circuit, where the opamp comparators are fed off 9v, so it accepts a 3.3v trigger and translates it to 5v. I guess I'll just try both and see

 on: January 21, 2022, 02:59:36 AM 
Started by slayerz - Last post by channelite
I use the Olegtron 4060 with the CB55, which has a power starve knob. Starving the power causes the CB55 to get distortion or unexpected sounds, which is kind of cool.  When there is no starving, which the normal gates are send from the Olegtron, the CB55 sounds normal.

 on: January 17, 2022, 09:06:51 PM 
Started by slayerz - Last post by slayerz
My circuit skills are non-existent but I was trying to figure out if it would be possible to lower the triggering voltage threshold in the trigger conditioning circuit so I could use microcontrollers with a 3.3v output.
If I understand correctly, lowering the values of R5, R12, R18 and R25 to, for example, 10k would have that effect while still keeping the current behavior for 5v triggers if I choose to use them later on.

I'm very possibly missing something so please let me know what you think.


 on: January 16, 2022, 02:29:27 AM 
Started by wax+wire - Last post by wax+wire
So I've been working on circuit bending my KAOSS Pad 2 / KP2. I had added a LTC1799 clock mod, a switch to hold the pad motion latch, and a patch bay of bannaa plug all connected to the RAM chip.

I'd been doing it over months, and stupidly forgot how to put it back together, and managed to put a crack right through the screen.

The screen is just two piece of glass with a resistance pressure strip around it, but it doesn't seem to work with cracked glass! I'm wondering if I should be able to just replace the broken glass with another piece, or replace the whole screen, or what other ideas there are out there. Feel like such a fool

 on: January 06, 2022, 10:35:31 AM 
Started by littleghost - Last post by littleghost
well, just an update for anyone who cares:

I did eventually get some good advice from some people over on the synth DIY subreddit.

one person told me I needed to wire  a diode in series before connecting to the keyboard matrix, but we eventually determined that this wasn’t the case, as only the “n” column pins in the matrix have diodes, and not the “s” pins (the rows), which would be the ones containing these secret drum samples.

Then I received a great reply with the actual probable answer; all of these pins connected to the matrix are also connected to “pull-up” resistors. Before this project & reply, I had never even heard of pull-up or pull-down resistors, logic states, or any of that. But basically, the reason this hadn’t worked previously, is because this pin should be  “active-high”, and needs to be connected to VCC via a 4.7k resistor like all of its neighboring pins to work properly.

Well, sadly, I tried this and still, no results. So at this point, ive decided to throw in the towel. It’s possible that even with the probably-correct solution in front of me, I still managed to wire it up incorrectly, and that’s why this didn’t work. It’s also possible that there was simply a software change on this chip between the PSS-80 & the PSS-125, and no amount of fiddling will ever unlock this drum pad ive spent so much time chasing. Honestly, who knows? Maybe someone will come along and succeed where i’ve failed one day, but for now, the PSS-80 remains drumpad-less.

Except… There actually IS a drum pad on the PSS-80, though its not super practical to use. By booting into its secret test mode (holding 2 highest keys while powering on), you not only reroute all of the face buttons to the keyboard, but you also turn the “voice select” buttons into a real, working drum pad.

The only issue; Because all of the buttons are rerouted, all of the keyboards usual functions are disabled with test mode enabled. And they stay disabled, until you turn the machine off and back on again, disabling the drum pad. Ive done lots of experimenting with this test mode to try to unlock aspects of it in normal boot up mode (it also has a cool reverb voice only accessible during normal operation) and re-route these drum buttons, but I haven’t had any luck there either.

Funny how a functioning drum pad on this device always seems to be so tantalizingly close in so many ways, but also completely unachievable 😭

Anyway. Thats where I leave this project. Maybe someone will pick up this torch some day and continue on, but for me, it’s the end of the road ✌🏼

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