This 1967 Raytheon circuit uses a Raystor, an optical coupler with a lamp and an LDR. The circuit can be adapted to use another type of coupler.
This circuit was obtained from Popular Electronics of the 1990s. It makes use of a mercury switch that...
I found this circuit in a Popular Electronics from 1992. The circuit shows how we can modulate a lamp...
Found in a 1966 American publication, this circuit invert the phase of a low frequency signal. The...