Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

Digital Speedometer (CB17306E)
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
Darlington Photo Amplifier (CB8316E)
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...
12 V inverter (CB8715E)
The output voltage of this inverter depends on the employed transformer. The circuit is from a 90s...