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 Forum index » DIY Hardware and Software » Circuit Bending
Post Your Instruments!
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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Thu Nov 19, 2009 9:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

All the controls, like the switches, pots, knobs, speaker.
Inside are a few oscillators made of simple transistors.

I noticed some SK1's in this topic.
Here are my modded Casio Twins :

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Another instrument I bended : the Randrum.
Originally one of the first analog drum devices.
A small box with 3 knobs : volume, speed, and a switch with 6 different rhythms.
It had one noise generator used for both snare and hihat, and a low sine resonator for the kick.

This bending went out of hand a bit. The front can be seen here
And this is the back :

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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electri-fire



Joined: Jul 26, 2006
Posts: 535
Location: breda nl
Audio files: 4
G2 patch files: 4

PostPosted: Fri Nov 20, 2009 5:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sam_Zen wrote:
Another instrument I bended : the Randrum.
A small box with 3 knobs : volume, speed, and a switch with 6 different rhythms. This bending went out of hand a bit.


Oh My God Sam_Zen. A BIT out of hand you say? I wonder what you would consider Way out of hand. A wall to wall front panel?

Absolutely fine looking instrument.
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toybox



Joined: Aug 03, 2005
Posts: 176
Location: chicago/peru,illinois usa

PostPosted: Fri Nov 20, 2009 6:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

That must have been a labor of love! any sound files
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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1342
Location: Telford, PA USA

PostPosted: Fri Nov 20, 2009 8:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

That puts the "ICK" in Wicked!
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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Fri Nov 20, 2009 11:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

toybox wrote:
That must have been a labor of love!

Yes indeed. The love for electronic music. It took more than a year to build this.
My first reason to bend this, was the need to get an external clock to drive the thing.
Because I wanted to get it synced with the sequencer of my AKS.

But I had no circuit diagram.
So I had to make a drawing of both sides of the PCB, compile the schematics out of that,
and isolate the different sections with a specific function. A close example of such drawing :

Posted Image, might have been reduced in size. Click Image to view fullscreen.

More about it can be found here

Including some tracks (ogg format) where the instrument is used.
I'm planning to scan cq publish more data about the architecture of the Randrum on this page.

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DerBAUM



Joined: Nov 14, 2009
Posts: 4
Location: BRD (NRW)

PostPosted: Sat Nov 21, 2009 4:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Really cool stuff Sam_Zen!!
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JohnnyDaManiac



Joined: May 11, 2009
Posts: 11
Location: US

PostPosted: Sun Nov 29, 2009 9:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I really dig the casio twins Sam_Zen and the randrum is jaw dropping. So many tie in points. I can't imagine how many total hours you spent in front of that. You definitely put yourself into your work and it shows in the final product. That front panel is ridiculous. Is that circuit diagram drawn on a napkin?
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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Thu Dec 03, 2009 10:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not a napkin, but on a piece of paper thin enough to draw the PCB of the same location on both sides.
As soon as I had isolated the functions and the matrix of the rhythm switch, I could add volume sliders,
and started duplicating f.e. the circuit of the bass drum oscillator, to get other percussion frequencies.

There are two basic components when circuit bending : Resistors and Capacitors.
Resistors represent the element of power, capacitors represent the element of frequency.
So changing a resistor means changing the strength of some signal.
Changing a capacitor means changing some central frequency in the formula, so e.g. another filter or oscillation.
Even if, during a simple circuit bending, one connects one point straight to another, and see what happens,
one uses in fact a resistor of zero Ohms.

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potar



Joined: Nov 05, 2009
Posts: 12
Location: Long Beach, Ca

PostPosted: Wed Jan 06, 2010 6:07 pm    Post subject: Alesis HR-16 I just finished.. Reply with quote  Mark this post and the followings unread

I just finished this one up after a few months on the shelf, new battery, fresh (or at least new) paint, and 30 patch points for Bent Drum Madness!!
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Video here
http://www.youtube.com/watch?v=r6aPjvO-xmM

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If you develop an ear for sounds that are musical it is like developing an ego. You begin to refuse sounds that are not musical and that way cut yourself off from a good deal of experience.
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destroyifyer



Joined: Mar 22, 2006
Posts: 425
Location: Babylon
Audio files: 4

PostPosted: Sat Jan 23, 2010 5:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Video


nx7_three.mp3
 Description:
One

Download
 Filename:  nx7_three.mp3
 Filesize:  1.23 MB
 Downloaded:  754 Time(s)


rx7nes_one.mp3
 Description:
Two

Download
 Filename:  rx7nes_one.mp3
 Filesize:  2.64 MB
 Downloaded:  616 Time(s)


rx7nes_two.mp3
 Description:
Threee

Download
 Filename:  rx7nes_two.mp3
 Filesize:  2.68 MB
 Downloaded:  560 Time(s)

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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 20514
Location: The Netherlands, Enschede
Audio files: 147
G2 patch files: 318

PostPosted: Sun Jan 24, 2010 9:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks good, nice samples too.
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Sam_Zen



Joined: Mar 08, 2008
Posts: 251
Location: NL

PostPosted: Sun Jan 24, 2010 8:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

Agreed. Nice bend kits. I like the video as well.
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slugger



Joined: Feb 11, 2010
Posts: 42
Location: up on Cripple Creek (CO)

PostPosted: Wed Mar 10, 2010 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

my stuff so far:

the Mimsy Modular:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

the Coffee Can of Doom:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

modified Poly 800 MkII:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The links for the first two will take you to my blog, which has more info & audio samples.

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eh?



Joined: Apr 16, 2010
Posts: 1
Location: Australia

PostPosted: Fri Apr 16, 2010 12:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, this isnt technically mine, but its pretty interesting anyway. its a keytar made out of a children's keyboard and a cheap guitar hero controller knock-off from aldi. every sound heard in the song was made with the keytar.

http://www.youtube.com/watch?v=VfF-eGeNjDQ
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destroyifyer



Joined: Mar 22, 2006
Posts: 425
Location: Babylon
Audio files: 4

PostPosted: Tue Sep 14, 2010 6:37 pm    Post subject: RX7 as a keyboard controller and sequencer. Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Besides being very much circuit bent, this RX7 functions as a sequencer and a keyboard controller for the NES... I have felt throughout circuit bending that these machines go together well, and as a result this is the third generation of this setup. If you like the looks of these, feel free to check out the sound samples.
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seaweedfactory



Joined: Apr 12, 2006
Posts: 61
Location: Earth

PostPosted: Mon Feb 21, 2011 9:23 pm    Post subject: . Reply with quote  Mark this post and the followings unread

.
Last edited by seaweedfactory on Sun Jul 06, 2014 7:27 pm; edited 2 times in total
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butchasound



Joined: Mar 24, 2011
Posts: 7
Location: NYC

PostPosted: Thu Mar 24, 2011 7:04 am    Post subject: Circuit Bent Roland TR-626 Reply with quote  Mark this post and the followings unread

Here's one I did a few years ago with help from the Burnkit 2600 site. The 626 has a 32 point IC chip with all the samples. Simple connections make it bend. I made an RCA patch bay that connects to a DB25 printer port. This video really only skims the surface, there's many more bends and multiple bends at once are also possible.

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dylar



Joined: Apr 25, 2011
Posts: 51
Location: iowa

PostPosted: Wed May 04, 2011 4:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

http://youtu.be/9u6IWO-NNq4
Here's a "Techno-Beat" toy keyboard. Didn't expect much out of this one, but it ended up making some pretty cool sounds IMO. Only 5 bent controls.
Plus, as usual I accidentally made a radio - but I decided to keep it this time.[/url]
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Lorenzo



Joined: Nov 09, 2008
Posts: 349
Location: Trieste - Italyjstan

PostPosted: Thu May 05, 2011 9:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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