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.

AC Amplifier TL061 (CB14495E)
The circuit is from Motorola's Linear Databook from 1990, but the configuration is current because...
Inverter source (CB8132E)
Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output...
Heads or tails 555 (CB22202E)
This is another one of the many versions of this circuit that we have in this section. We found it in...