also see my blog:electronics




custom controller with 5 rotary encoders (endless) with as many push buttons, 2 softpots and 3 touch sensors (capacitive). i use it to control my sound and video software. it is built using the absolutely brilliant avr-usb (now v-usb) from obdev and shows up like a standard HID devices. small, lightweight and just one cable (usb). plus it is very cheap to build - see parts list. the biggest cost is the encoders.
_schematic (version 1.0)
_firmware and schematics (version 1.0)
_class and abstraction for supercollider & max (version 1.1)

redKontroll03 redKontroll04 redKontroll05


another custom controller with 4 potentiometers, 1 slider, 1 light sensor, 16 pushbuttons and 1 switch. it is also built using the great v-usb (aka avr-usb) from obdev.
_schematic (version 1.0)
_firmware, schematics and partslist (version 1.0)
_class and abstraction for supercollider & max (version 1.0)

redKontroll2-01 redKontroll2-02 redKontroll2-03


27 wireless sensorboxes with up to 10 digital inputs and 2 analog outputs (pwm). built around the mirf v2 transceiver from sparkfun which has a range of approximately 80 meters. firmware written in assembly, radio network in supercollider. specially designed for the installation OrFi (see
_schematic master
_schematic slave
_firmware offline

orfi1 orfi2 orfi3


4 button midi pedal with 62 presets. the buttons send note on-off/on-on and controller data in different combinations or cycle banks. each preset can have up to 3 banks of settings.
casing&design: hadrian prett
software&electronics by me

midiladan fram midiladan under
midiladan bak midiladan krets


software phrasesampler / loopmachine with a custom hardware controller.

holydopahela holydopakrets holydopascreen


a device for switching four composite video signals. either pass through signals or take video from the fifth input. this fifth input is normally a black frame and thereby the device is functioning like an on/off switch for the individual four channels. but the fifth input can be any video signal.
the 4 input connectors are red, the common 5th input is yellow and the 4 outputs are black. this box is powered by a 9v ac adapter.

blackout00 blackout01 blackout02


videoswitch for 4 s-video or 8 composite videosignals. mainly used for quickly switching between four connected cameras. it needs power from a 9v ac adapter.

redFrikKamera redFrikKamera redFrikKamera

cv-midi boxes


cv-to-midi / midi-to-cv converter unit. usage: remote control, installations, analog synths, sensors.
rackmount 19" with 1/4" jacks, 12 inputs (4 analog, 8 digital), 12 outputs (4 analog, 8 digital), midi in/out/thru jacks, 9-12v dc power supply.

f0b4488hela f0b4488bak2 f0b4488krets


firmware upgrade for f0b4488. adds software programmability from any midi equipped mac/pc/linux system. customize what kind of midi data is transferred and scale cv output.


cv-to-midi converter unit. usage: installations, sensors, custom instruments.
62 inputs (16 analog, 46 digital), 2 midi out jacks, 9-12v dc power supply.


cv-to-midi / midi-to-cv converter unit. usage: remote control, installations, analog synths, sensors.
3.5mm jacks, 16 inputs (8 analog, 8 digital), 12 outputs (all digital), midi in/out/thru.

f0b80812hela f0b80812krets f0b80812krets2


tiny midi circuit with 14 digital in or out.

f0bs_mini2krets1 f0bs_mini2krets2

cv-to-midi16+8 (old)

customized general-purpose cv-to-midi converters based on the basic stamp 2 microprocessor. plug in any variable resistance (sensor) and convert it to midi controller data or use the digital inputs to generate note on/off messages. the pictures and schematic below shows one possible setup with 16 analog and 8 digital inputs.

cv-to-midi16+8hela cv-to-midi16+8krets cv-to-midi16+8screen