Found in Popular Electronics from the 90s, this circuit is intended for a radar emitting pistol. The circuit is very critical for the frequency at which it operates.
This is a circuit from 1999 documentation, therefore there is some difficulty in obtaining the...
This circuit emits a warning sound when night falls. The circuit is from a Hands On Electronics from...
This circuit with germanium transistors is from 1960 and was found in Mullard's transistor...