This circuit, found in 2002 documentation, triggers LEDs when a phone call is received. The LEDs will flash alternately in these conditions. Common LEDs are used in this circuit.
The circuit shown in the figure triples the alternating voltage providing a continuous output...
This triac power control circuit makes use of an SGS integrated circuit, which is uncommon...
This circuit was found in the November 1992 Radio Electronics magazine. The resistor in series with...