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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Sound Activated Relay (CB19971E)
This Vox or sound activated relay was found in an American documentation from 1975. Equivalent...
4 A 79xx Negative Current Regulator (CB15341E)
This circuit is from Motorola's Linear Interface ICs from 1993. The circuit uses a booster...
1000 second timer (CB23601E)
The existence of field effect transistors at the input of the integrated circuit (operational...