This continuity test was found in a 90s Electronic Engineering. Transistors are types of general use of the time with equivalents such as BC548 and BC558.
This circuit for audio applications was found in an English magazine from the 80's. The circuit...
July 2017 - Ricoh's new 200mA R1524x voltage regulators are available from Mouser Electronics with...
This 80's circuitry decodes stereo signals used in analog TV at the time. The circuit can be used...