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 operational amplifier circuit with variable gain was obtained in an 80's Electronic...
This audio mixer or mixer was found in a translation of an American publication from the 1980s. The...
September 2017 - Mouser Electronics already has the AP431S adjustable regulator from Diodes...