Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

Fluid Level Controller (CB5309E)
This circuit, which can be used as a shield, was found in a 1980s documentation. The circuit can be...
Video amplifier (CB9413E)
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
Wireless FM Microphone (CB17295E)
The integrated circuit used in this 1986 wireless microphone is not very common today. The L1 coil...