Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two channels including the voltage regulator stage.
This 2004 circuit is based on the ionization effect that occurs in old incandescent lamps with...
This circuit memorizes through an LED indicator if your phone was used during your absence. The...
Found in a 1969 Electronics World, this circuit generates low frequency signals with two...