5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

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Optical FM Transmitter (CB8864E)
This circuit was found in a 1970s General Electric documentation. This circuit already used an...
Astable Multivibrator LM3900 (CB5053E)
A rectangular signal can be generated with the figure setting. The values given in the circle...
FET Preamplifier with Tone Control (CB13677E)
This circuit was obtained in an old publication. The FET can also be the BF245. The potentiometers can be...