While I started working on a (never ending) modulair system I also had the plan to make a small synth that I could build relatively fast and cheap.
It is based on a simple soundgeneratorchip (sn76477, half analog/half digital) and is more of a sound effects machine. Sounds from dr Who come to mind when playing with this. I found back all the pencildrawn schematics and perfboard layouts so after some small repairs it came alive again and I recorded a few sounds that I made.
It also has a very basic handcontrolled resonant filter circuit being nothing more than 1 transistor and a twin-T feedbacknetwork with potentiometer (like a gitar wah-wah box). A few opamps sum the control and audio signals.
The nice woodwork was done by my father.
sound1
sound2
sound3
sound4
sound5
sound6
sound7
sound8
(I have to admit that the designs are a bit basic)
circuit-signalflow
circuit-page1
circuit-page2
circuit-page3
circuit-page4
