N° of component 

Transistor Tester (CB1409E )

The indicator instrument of this transistor tester, from an Argentine publication of the 1970s, may be the corresponding range of currents of a common multimeter. The circuit proves both NPN and PNP transistors depending on your connection. The power is made by two or four small batteries. The setting is for the full scale of the instrument, taking as reference a known gain transistor.


Circuit Bench