This simple transistor tester was found in a Japanese magazine in 1967. It tests general purpose transistors of both the NPN and PNP type and is powered by 4 batteries (6 V).
This high input impedance circuit was found in American documentation from the 1980s. The power...
This didactic circuit makes the sequential activation from 0 to 10 to demonstrate the functioning of a...
Originally recommended to give a tone of transmission in equipment of the 60s (tubed) this circuit is...