Bass control (CB8722E)

Found in a 1993 Electronics Hobbyst Handbook, this passive circuit can be used with common preamplifiers and amplifiers.

Position indicator (CB17588E)
The relay of this circuit closes when the position set in P2 is reached by the sensor...
Flame Detector (CB17547E)
This circuit is intended to monitor the flame of gas heating systems that must always have a small...
TTL Clock LM311 (CB20622E)
This circuit makes use of an old operational one to generate clock signals that depend on the...