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 56 Euro and built 86 Euro. Batteries not included :) See below for what is included. If you are more comfortable with online stores, it’s available at https://tonetoys.etsy.com and at https://www.tindie.com/stores/poetaster/
This is a funk piece with the moat and keep playing together. It’s over the top but shows what I made keep for :-)
Here is a complex example of self-sequencing :)
More 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