High gain radio (CB21922E)

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

Micro FM Transmitter (CB19438E)
According to the author of this project, from a documentation on espionage from the 1980s, this...
Timer TAA865 C (CB16092E)
This circuit suggested by Siemens can provide time intervals for triggering values that are given...
Transistorized 1 kHz Astable (CB25323E)
This circuit generates a good-intensity 1 kHz rectangular signal. The circuit is from Electronics Now...