FM detector (CB20237E)

This circuit is based on an unusual component today. It demodulates a 10.7 MHz FI signal and was found in 1980s documentation.

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Car adapter (CB7252E)
Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V...
Light Activated Relay 4001 (CB25865E)
This sensitive circuit was found in the June 1995 Electronics Now magazine. R1 can be from 10k to 1M...
Continuity test (CB9328E)
This audible continuity test was obtained in a book from the 90's describing simple projects. The...