High gain radio (CB21922E)

This simple 1 transistor radio was found in Raytheon's transistor manual. The transistor is germanium from the 60s.

Diode Stabilized Wien Oscillator (CB14906E)
We found this configuration in a Radio Electronics from 1989. The circuit can be designed with...
Locked relay shield (CB8837E)
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
Sound Flash Trigger (CB5442E)
This circuit is from old American documentation intended to trigger the flash of a camera flash with...