The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
We found this circuit in a 1982 documentation, but the circuit can still be easily assembled, as the...
This circuit uses the SQ3524, a switching integrated circuit. The circuit was found in the April...
This circuit is intended for the use as modulated light signals from digital sources. The circuit...