This TTL circuit uses LED indicators and must be powered by a voltage of 5 V. The capacitor determines the speed of the draw. We found it in documentation from the 90s.
This circuit was obtained from Popular Electronics in 1993. It consists of a low frequency...
The emitter of this circuit from a 1995 publication is an infrared LED and the sensors are...
This version of the circuit is from 2000, using a source of negative voltage that allows to obtain...