This circuit was obtained from Signetics documentation from the 80's. The components used are from that time. The circuit can serve as a basis for repair, maintenance or projects with modern components.
This circuit from a Radio Electronics from February 1966 uses an LDR as a sensor. The transistor is a...
The trigger signal for this circuit is an audio tone. Tones up to close to 100 kHz can be used. The...
This transistor tester configuration can be found on this website with many variations. The...