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.

12 W Stereo Amplifier TDA1010 (CB14721E)
We found this amplifier for automotive use in the Philips integrated circuit manual from 1990. The...
Digital Audio Recorder (CB18606E)
This interesting circuit records a few seconds of audio signals, reproducing them in a small...
Optocoupler Input Shield (CB18262E)
Settings like this can be found at various points on this site. The trigger door can be a 4093...