This circuit uses a lamp driven by the Hertz loop and measures its brightness with ordinary photovoltaic cells. The circuit is from a Radio Electronics from February 1964.
The simple speed control for DC motors shown in the figure can control loads up to 2 amps. The...
This is the typical circuit of a local oscillator for a superheterodyne FM receiver. The circuit...
This circuit was suggested by General Electric in documentation from the 80s. SCRs are common...