This circuit was found in a 1970s General Electric documentation. This circuit already used an emitting LED. The circuit operates at frequencies from 50 Hz to 50 kHz with short pulses
This is a high voltage probe that allows the measurement of high continuous voltages with a common...
This oscillator provides a 1 MHz rectangular signal determined by the capacitors used. The circuit...
This circuit was found in a 90s Popular Electronics. The sensor can be any phototransistor. ...