X1L3 – Circuit bent – Casio SK-1 – for Meng Qi Music

July 2, 2015 · Posted in Uncategorized · Comments Off on X1L3 – Circuit bent – Casio SK-1 – for Meng Qi Music 

The Casio SK-1 is the cheapest sampler in the world. Followed by the SK-5, the second cheapest in the world. It’s a polyphonic synthesizer (just four voices) with very cheap sounds and it can store one sample in its memory. The sampling is 8-bit PCM, 9.38kHz, giving about 1.4 seconds. It’s so gritty… Samples can only be recorded through the awful mini-mic built-in to the upper-right corner or a 3.5mm line-input plug on the backside of the synth. Alas, its memory clears when turned off.


There are 11 built-in accompaniment-style drum patterns (disco, rock, samba, etc.) which are all embarrassingly fun and totally unusable. The keyboard uses mini plastic keys. It lacks MIDI, lacks effects, edit-ability, memory, and filtering. However there are 13 envelope shapes that can affect your sample or synth sounds somewhat. There is also portamento, vibrato, and chord accompaniment with the chord selector system.

Background video description:

One off custom Casio SK1 project.

Built for:


Evolving improvised set. Melodic ambience to drone to noise. Touching on the lines of PE and HNW. Anyone who’s familiar with the Alec Empire live dvd of intelligence and sacrifice will probably recognise the tone of this from the noise set in new world order.

No post processing or production. It is what it is.

Circuit Bent Mickey Mouse Toy Phone

March 23, 2015 · Posted in Uncategorized · Comments Off on Circuit Bent Mickey Mouse Toy Phone 

Mickey Mouse Toy Phone

Green LED
Switched mono mini jack output
Pitch Up/Down Control
Sequencer Pitch trigger jack for my sequencer to warp the sounds more!

Groove TV: Circuit Bending & Beyond (HD Video)

November 23, 2014 · Posted in Uncategorized · Comments Off on Groove TV: Circuit Bending & Beyond (HD Video) 

In this episode of Groove TV the Berlin-based sound artist Derek Holzer gives an introduction to the subculture of circuit bending and do-it-yourself electronics. Without any formal training in either music or electronics, Holzer decided to try his hand at building his own instruments and subsequently developed the design for his “SoundBoxes”.

Link: http://macumbista.net/ (Derek Holzer)

Filmed, edited and directed by: Maren Sextro

First broadcast on groove.de in May 2012
Visit our website: http://www.groove.de
Like us on Facebook: http://on.fb.me/15TcIX0

Dr Blankenstein’s Circuit Bent “Pocket Calculator” Live Demo

May 5, 2014 · Posted in Uncategorized · Comments Off on Dr Blankenstein’s Circuit Bent “Pocket Calculator” Live Demo 

More Dr Blankenstein: http://www.drBlankenstein.com
Twitter: https://twitter.com/Dr_Blankenstein
eBay: http://www.ebay.com/usr/dr_blankenstein

In this video we see a live demo / rehearsal for the Drew Blanke (Dr Blankenstein) for his presentation for MAKE magazine at Moogfest 2014. The jam is based loosely around the Kraftwerk classic “Pocket Calculator” off their “Computer World” album. Keep in mind this is live, and unedited…. just a raw jam on 4 circuit bent pieces.

The pieces include a Mattel Bee-Gee’s “Rhythm Machine” keyboard, Casio ML-831 Musical “Pocket Calculator”, a built from the ground up custom Stylophone and a prototype for the APC2600 V2.6. All pieces have the ILLUMIRINGER device modification kit installed in them, although most of the demo is featuring the pocket calculator in ILLUMIRINGER mode. Only reverb has been added to the mix via the mixer. The beat was made on an Electribe ER-1 and sampled into a Boss loop pedal.

Sorry about the slightly out of tune Stylophone in the beginning, it’s needs to be left on for a bit to warm up and get into tune (kinda like an old moog). Hey, that’s rock n’ roll. It’s worked into the jam nicely… so why not let it roll.

Stay tuned for individual demos of each piece in this video coming at you THIS MONTH (I promise, I know we have been slacking on the videos:) Thanks for watching, please remember to SUBSCRIBE and follow the twitter link up top to stay up to date on the newest Dr. Blankenstein creations.

Better Living Through Circuitry

Moogfest 2014 Circuit Bending Challenge

April 29, 2014 · Posted in Uncategorized · Comments Off on Moogfest 2014 Circuit Bending Challenge 

Moogfest 2014 Circuit Bending Challenge went off in full blast at the Moog Store
read the article here http://wp.me/p2DmTM-1Vm

Here’s my Circuit Bent Hing Hon EK-001 squarewave keyboard, built into an upright style synth, which runs on four AA batteries (6V). Three months of semi-constant work for the Moog circuit bending challenge of 2014. I hope you enjoy. In this demo I try to run over some of the more pertinent mod combinations while keeping the demo time to a minimum. All sounds in this video are raw.

NOTE: At 19:20 Youtube may have removed the audio (a song by Squarepusher) – to see the [external audio input to video output] you can go here: https://www.youtube.com/watch?v=du6Ve… for another demonstration which youtube hasn’t forced me to remove…


0:35 – Distortion modulation on rhythm
2:00 – Engage drum glitch switches
2:57 – First use of pitch LFO
4:30 – All LFOs in use with keys
6:00 – Rhythm skip & key sustain
6:20 – Short demo of hex keyboard (and optic theremin)
8:30 – Rhythm skip/LED based optic theremin mod, then LFOs added
12:41 – Optic theremin for dist. modulation controlled by hand movements
13:30 – Vibrato touch contact
14:05 – Crude CV input (TR-626 playing rhythm, x0xb0x as CV source)
17:13 – Black and white visualization output demo (keyboard sounds)
18:20 – Audio input distorted (x0xb0x as audio source)
19:18 – B&W visualization output (from external audio input)
20:25 – Video input distortion
22:23 – Triforce get! (hex keyboard)

Detailed photo album of progress, build instructions, and schematics located here: http://imgur.com/a/qOT5Y

A full Bill of Materials spreadsheet is available here for download:http://www.bit.ly/1bXsns8

If you have any feedback or questions that aren’t answered by the schematics and other info in the photo album, just comment or send me a message here on youtube, or email me at george.gleixner@gmail.com – always happy to help!

Circuit bent Casio PT-50

December 10, 2013 · Posted in Uncategorized · Comments Off on Circuit bent Casio PT-50 

Hand built framework and additional panel design for the modifications.

This was the only Casio keyboard with ROM-Pack slot but no key lighting; instead it can load the ROM-Pack musics into an internal sequencer, and with the optional Casio TA-1 module it can even save them on audio cassettes. Even a RAM-Pack cartridge Casio RA-1 was made for this thing to save sequencer data – I never saw any other Casio keyboard designed for using it.

Despite this keyboard looks almost like a twin of the Casio PT-30, there are many small differences. 3 of the 8 preset sounds are changed, the chords and bass timbre is different and also the rhythm set is completely different and includes fill-in. Even the LCD has different segments and shows e.g. a “J” for major chords. Also the sequencer of this thing was changed and is horribly awkward like with Casio MT-70, because it apparently neither can record note lengths in realtime nor melody and chord together, thus everything has to be entered in different modes step by step. But by the general similarities I only explain here the differences to the PT-30.

Main features:

  • 8 OBS preset sounds {piano, harpsichord, organ, violin, flute, clarinet, trumpet, celesta}.
  • 16 preset rhythms {rock, rock’n’roll, disco, 16 beat, samba, latin rock, bossa-nova, beguine, tango, march, waltz, rock waltz, slow rock, ballad, swing 2beat, swing 4beat} made of analogue percussion + bass & piano accompaniment (contains no arpeggio).
  • tempo +/- buttons (19 steps, counts 1..20)
  • different editable sequencer (no realtime recording, terribly awkward!)
  • transpose buttons (12 semitone steps)
  • different LCD display shows pressed keys and chords (only important for the sequencer)
  • ROM-/ RAM- Pack slot (but no key lighting/ melody guide feature)
  • demo button (plays musics from the inserted ROM-Pack when present)
  • multi-chip hardware:
    • CPU= “NEC D1868G 004, 8314EK, Japan” (80 pin SMD)
    • 2x SRAM= “HD  B, 61914, 3D, 23” (44 pin SMD)

The Devil’s Machine (Circuit Bent Kawasaki Keyboard)

August 14, 2013 · Posted in Uncategorized · Comments Off on The Devil’s Machine (Circuit Bent Kawasaki Keyboard) 

Circuit Bent Kawasaki toy keyboard.

Onboard resonant filter from Ray Wilson’s Weird sound generator.
Onboard pt2399 delay.
Variable LFO on the filter.
Huge pitch bend range.
3 distortion bend knobs.
Special DJ style “TRansformer” button.

Check out
for more info

Circuit Bent Playtime Keyboard

July 20, 2013 · Posted in Uncategorized · Comments Off on Circuit Bent Playtime Keyboard 

Time for a new circuit bending video, details below:

Playtime Keyboard

switched mono 1/4inch jack output
white LED
red LED
power starve control
pitch up/down control
hi-fi boost
Monotribe Sync input with 4 rotary glitch switch to select which button glitch you want. The Monotribe triggers various buttons on the keyboard to make it sound glitch – video to follow for that

.fd. online
Facebook – freeform delusion
Twitter – https://twitter.com/freeformd
eBay – Search for – Circuit Bent
My older Circuit Bending channel – http://youtube.com/eecouk

Circuit Bent Star Wars Technika FX

July 16, 2013 · Posted in Uncategorized · Comments Off on Circuit Bent Star Wars Technika FX 

Star Wars Technika – rehoused Star Wars sound FX keyring inside a Technika casing

switched 1/4inch jack output
white LED
4 red momentary buttons for each sound
toggle switch with rotary switch to select a sound to hold and loop
red latching button to select pitch on/off
pitch up/down control

Circuit Bent Mickey Mouse Clubhouse Piano

July 14, 2013 · Posted in Uncategorized · Comments Off on Circuit Bent Mickey Mouse Clubhouse Piano 

Mickey Mouse Clubhouse Piano – with a very special guest playing!!

switched 1/4inch jack output
Pitch up/Down Control
Red Button Bass feedback control
Two Way switch for distortion or feedback with control knob

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