Artistic Technology and Development on Mads Kjeldgaard — Composer and Sound Artist

SuperCollider DSP plugins and language extensions

Sat, 31 Jan 2026 00:00:00 +0000

Audio plugins

Feedback Delay SC: A collection of delay-related plugins for SuperCollider
Gutter Synth SC: Chaotic physical modelling in SuperCollider (Developed with scott carver)
Ported Plugins: A collection of plugins for the SuperCollider sound environment, all of which are ported / remixed from elsewhere

Language Extensions

Find more extensions on my Github and on my Codeberg.

Monolithic: Mads Kjeldgaard’s extension of the SuperCollider audio programming environment.
PolyBuf: Easily load and access a bunch of audio files into collections of buffers in SuperCollider.
HarmonicToolkitSC: Chords, arpeggios and harmony hacking in SuperCollider 👹.

Tiny Analog Motor Controller

Sat, 31 Jan 2026 00:00:00 +0000

Features

Easy to use: Just connect power at one end, a motor at the other end.
Power: 5-12V DC
Control speed using a potentiometer.
Hackable: Pins broken out to allow daisy chaining boards, or connecting circuitry in between the PWM signal and the motor gate (eg a button, an LDR or whatever).
Based on a 555 timer chip in astable mode.
4 x M3 mounting holes
Completely open source.
Tiny (about the size of a matchbox)

Videos

Datasheets

555 chip: LMC555
Motor mosfet: Infineon IRFS3806TRLPBF (but any similar mosfet will do the job).

Credits

Thanks PCBWay for sponsoring the PCB’s for this project during prototyping.
Thanks Thom, Niklas, Eirik, Fredrik and others for inspiration.

Pico Programmable Audio Board

Sun, 23 Mar 2025 00:00:00 +0000

A development board for working with audio, SD cards, hardware midi and sensors on the Raspberry Pi Pico.

Use this board to create interactive art projects, synthesizers, audio file players, props, USB audio interfaces, you name it.

Features

High quality i2s stereo output DAC with 3.5mm line out jack: PCM5102A DAC – this DAC is widely compatible with all platforms and SDK’s, including Arduino and C.
SD card reader
NeoPixel
Hardware MIDI in and out.
Compatible with all Pico-compatible boards, including Pico 1, PicoW and Pico 2.
StemmaQT connector for easy i2c expansion.
Power: Use external power (5V) or power from USB on Pico. Circuit will automatically switch between these two sources, depending on what’s available. Includes reverse polarity protection on power input.
Optional: Hardware mute button may be connected directly to DAC.
All remaining pins broken out with lots of ground and power pins to make external connections easy
Reset button connected to RUN on the Pico to make it easy to restart the Pico.
Self-documenting board: All pins and connections are written on the board itself.
4 x M3 mounting holes

Hyaline Motor Controller XL i2c

Sun, 09 Mar 2025 17:45:42 +0100

A board for Raspberry Pi Pico compatible boards, designed for controlling motors.

It can be used with pretty much any Pico-like board. It uses an i2c-based interface for controlling the motors, which frees up a lot of gpio for other things – at the expense of a limited PWM frequency of 1.6khz maximum (which can cause audible high frequency noise in some motors).

The board is completely decked out with a bunch of features to make it easy to hack and use it as the “brain” of a motorized project of any kind.

Teensy Haptic Audio Player

Thu, 06 Mar 2025 16:12:21 +0100

A PCB designed for audio and haptic projects with a Teensy 4.0.

Among other things, it can be used to play audio from the computer as a sound card when connected via USB or from audio files via the on board SD card reader. The audio will then be output both to a 3.5mm audio jack and a haptic driver that will make a vibration motor like this one vibrate in sync with the audio, kinda like in a gamepad, sex toy or phone.

Birdhouse