This circuit was found in the Electronics Experimenter Handbook from 1991. The sensor is a diode and the circuit has a relay according to the voltage used in the supply.
This relaxation circuit was found in a 2002 documentation. Several articles dealing with white...
The recommended distance between the emitter and the sensor of this coupler is 15 mm. The circuit is...
We found this test circuit in the November 1999 issue of Electronics Now magazine. The circuit is to be...