This commercial circuit is from a Japanese magazine from 1967. It uses germanium transistors, and the coil can be made with 80 to 100 turns of fine enameled wire on a ferrite rod.
We found this amplification step in an English publication from 1977. The circuit does not use a...
This TTL shield with high level logic is from the LM111's own 80's manual. The integrated circuit is...
This effect for guitar was found in an English magazine from 1978. The transistors can be the most...