1 Minute to 20 Hour Timer (CB25748E)

This wide range timer was found in the July 1994 issue of Electronics Now magazine. The circuit drives a relay and is powered by the relay voltage.

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Balanced Mixer as Product Detector (CB4235E)
Found in a 1980s telecommunications documentation, the circuit presented acts as a product...
IR Remote Control (CB26156E)
This circuit was found in the Electronics Experimenter Handbook from 1991. The circuit controls a simple...
Timer with 741 (CB12281E)
The time obtained in this circuit, from a 1978 publication, depends on R3 and C. R3 can have...