Engineering Project - Analog to Digital Synthesizer

Look at some of these:

Selected synth related LMNC projects

Item Store link Project link Discourse link Annotated
ARDUINO SEQUENCER KEYBOARD project discourse
MIXER project
SIMPLE 1v/oct OSCILLATOR project annotated
SIMPLE ENVELOPE GENERATOR project annotated
SIMPLE LOW PASS FILTER project annotated
SIMPLEST OSCILLATOR project
SUPER SIMPLE MIDI KEYBOARD project discourse

The “Simplest Oscillator” is interesting but I wouldn’t try to make it the basis of a synth. For one thing it’s simple in that it has very few parts, but it can be tricky to get it working. For another thing its range is limited and it’s hard to make it work reliably to play different notes.

The “Simple 1V/oct oscillator” uses an AS3340 chip which might or might not suit you, it’s pretty much the core of a voltage controlled oscillator in a single chip and maybe you want to use something less “prepackaged”. But if not it’s a good way to go.

You might not need a voltage controlled oscillator, maybe a simpler oscillator would work for what you want, in which case there are other designs out there that are pretty simple (but more usable than the “Simplest”).

To play two notes at once you pretty much need two oscillators.

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