The capacitors on this circuit determine the frequency that this circuit can detect. We can adapt it to work as an interesting shield detector for logic signals.
This circuit uses an optocoupler with a phototriac or optotriac to drive an external triac. The...
The circuit in figure 1 is a dynamic test for FETs. The characteristic of a FET is displayed in...
This circuit was found in a 1965 Radio Shack documentation. The transistors are from that time....