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.
The two previous circuits show the INA185 a current sensing amplifier in basic applications. This...
This metronome configuration with the 555, quite common was found in a 90s Hands On Electronics. The...
This bidirectional circuit was found in an American documentation from the 80's. The LEDs are...