This circuit with germanium transistors was found in a publication by Gernsback from 1960. The circuit is low power, a few tens of milliwatts.
We got this circuit from Radio Electronics from July 1990. The circuit mimics the sound of the red...
This circuit was found in a 1987 documentation. It is a timer that takes advantage of the signal of...
This TTL circuit found in the September 1996 issue of Electronics Now magazine doubles the...