This commercial signal follower was found in a 1967 Japanese magazine. It uses germanium transistors and provides a speaker output without the need for a transformer.
We find this circuit in an old American manual from the 80's. The circuit has a memory that keeps...
This circuit, found in a 1982 documentation, consists of a small inverter based on a Hartley...
This relay circuit protects against accidental inversion of input polarity. The circuit was...