Found in an 80's Electronic Design, this circuit is based on the ICL7107 which is not an easy component to obtain today. The circuit is compatible with TTL and CMOS.
This stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit is from an English magazine of 1974, but can still be assembled with the replacement of...