Testing of thermistors and SCRs (CB21391E)

This circuit was found in an old American manual. It is intended for testing SCRs and thermistors using indicator lamps.

Geiger Counter (CB21199E)
Found in old documentation, this meter has a high voltage inverter for the Geiger tube. The...
100 kHz Operational Oscillator (CB15105E)
In the figure we have a 100 kHz crystal-controlled oscillator using an operational amplifier....
4001 Oscillator 600 Hz to 6 kHz (CB24341E)
Found in the November 1974 issue of Radio Electronics magazine, this circuit has a frequency range...