This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.
This sophisticated comparator, which may have didactic or practical purposes, was found in a 1980s...
July 2017 - The new Schottky rectifiers from Diodes Incorporated with 5 to 40 A currents and 100...
Suitable for clandestine listening and in SMD assembly, this circuit was found in the Radio...