work in progress and by no means "production ready"
proceed with caution until it is production ready.
arduino controlled VCO VCF and VCA.
Uses Digital Potentiometers controlled by an MCU through
an I2C Expander.
Please see readme.txt in attachments.
Little "Stylophon" thing. Tested and works. Bridge the solder Jumper named "BYPASS" that it works.
ATTENTION! HEADPHONE AND DC_IN JACK FOOTPRINTS AR **NOT** CORRECT!
The Power switch is a momentary switch you should also replace this one with a spdt switch.
**You should use another part for production!**
SV2 means "Square-o, Version 2." Version 1 was a simple square wave oscillator built using 1/6 of an SN74HC14N Hex Schmitt Trigger. Version 2 is very much the same idea, but the dimensions are intended to comply (I think, anyway) with Intellijel/Doepfer Eurorack design specifications. This version also features vertical, mounted audio jacks and potentio...
9V input. Output range: 5V-6V over twelve "keys." Designed to be connected to twelve simple switches or buttons and fed into an oscillator's CV input jack.
Want to buy one pre-assembled by JLCPCB? [go here](https://www.tindie.com/products/diysynthjunk/twelvey-12-channel-control-voltage-interface/)
Note: This design also features a space (currently unused) for a built-in dual oscillator (SN74LVC2...
An expansion of the Chaos Nand drone synthesizer.
This one has been fine tuned so sound is a little bit less out of control. Gate inputs have been added to control the characteristics of the sound from a sequencer (but not its pitch).
* POT1: Main pitch. Controls the 2 main oscillators at the same time, with lovely imperfections so they drift a bit out of tune.
This is a ladder filter based off of the Moog style one from the papers [*Analysis of the Moog transistor ladder and other derivative flters*](http://www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf) and [*Generalized Moog Filter: Part I Linear Analysis and Parameterization*](https://aaltodoc.aalto.fi/bitstream/handle/123456789/14420/article5.pdf).