This photoelectric sensor that triggers a relay was found in an English book from 1989. The transistor is a general-purpose type, and the integrated circuit consists of an operational amplifier.
The quiescent current of the small transmitter is around 20 mA. The transmission frequency depends on...
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit has an interesting application. If a device with the selector switch in the 110 V...