Null Indicator (CB21930E)

This bridge was found in a Raytheon transistor manual from the 1960s. The transistors are germanium from the time.

Astable 555 with two potentiometers (CB25510E)
This circuit has both frequency and duty cycle control. We found it in the October 1992 Radio...
12 V x 2 A power supply (CB11911E)
This power supply is indicated for the supply of not very powerful car radios of the AM and FM...
Carrier Switching Transmitter (CB14896E)
In the absence of a modulation signal, the carrier of this simple short-range transmitter is cut...