keep

Keep, was made as a companion to bastl instruments ‘kastle 1.5’ synth.

It’s a self-modulating modular analog synth based on the ancient XR 2206 IC, which you can still buy (in china) :)

keep_v4

I make limited numbers and offer a kit for sale. The kit is 50 Euro and built 86 Euro. Batteries not included :) See below for what is included.

Here is a complex example of self-sequencing :)

More videos and audio …

Keep videos and audio

Open hardware

Open Sources includes several versions as fritzing files. The breadboard and schematic views are messy. Working on it.

The kit

The kit is pictured below.

keep_v4 kit contents

What’s in the kit?

  • 1 40106 (+ 1 spare!)
  • 1 CD4040E (+ 1 spare!)
  • 1 XR2206 frequency generator
  • 1 Audio Jack (TRS) 3.5mm
  • 4 Ceramic Capacitors
  • 4 Electrolytic Capacitor
  • 1 100kΩ Resistor
  • 1 1kΩ Resistor
  • 1 220Ω Resistor
  • 2 330Ω Resistor
  • 6 4.7kΩ Resistor
  • 10+ Custom female headers - 2 pins - 10 pins
  • 1 DIY Vactrol
  • 1 Barreljack Power plug
  • 1 LED (+ 1 spare!)
  • 2 Top and bottom PCB
  • 4 Silicon feet
  • 9 Rotary Potentiometers
  • 9 Pot Knobs
  • 1 9volt to barreljack plug
  • 12 mini jumper cables of various lengths and color