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).
We present a DC-DC converter circuit that can operate with input voltages from 2.4 V to 14 V and...
We found this circuit in a 1977 Radio Shack brochure. Transistors can be the most modern BC548 for NPN...
This circuit can be used as an input shield for microcontrollers or other TTL circuits. The power...