Transistor tester (CB22071E)

Found in 1990s documentation, this circuit tests both PNP and NPN transistors by providing status indication on LEDs. The base is the LM380.

Who is the fast (CB9809E)
This simple TTL circuit indicates which was the first to press one of the four pressure switches. The...
Unijunction transistor sequential timer (CB21400E)
This circuit was found in Motorola documentation from 1968. Transistors can be modern equivalents, just...
Square generator with 2N2646 (CB23919E)
In this circuit, a unijunction transistor controls a multivibrator providing a rectangular signal...