Jule T.'s Analog Synthesizer Build Breaks Things Down Into Easy-to-Understand Sub-Circuits - Hackster.io
DIY audio synthesizer aka electronic piano circuit - Gadgetronicx
Paraphonischer Analog-Synthesizer Circuit Mono Station von Novation | KEYBOARDS
simple DIY 555 synth - Make:
oscillator - Why does music synthesizer built from chain of astable multivibrator circuits get "out-of-tune" after a few hours? - Electrical Engineering Stack Exchange