- Published in issue 1/2018 on page 92
Bi-colour Transistor Tester
Green: NPN; red: PNP
Remarkably, in this transistor tester the TUT (transistor under test) flashes a bicolour LED. This allows you to see immediately whether the transistor is functioning, which terminal is the base, emitter and collector, and whether the trannie an NPN or PNP type.