When the sensor, an ordinary photo-transistor, receives light, the relay closes its contacts. The circuit can be powered with either 6 or 12 V depending on the relay and the sensitivity is set at R1. The circuit is from a 1993 Poptronics.
When the sensor, an ordinary photo-transistor, receives light, the relay closes its contacts. The circuit can be powered with either 6 or 12 V depending on the relay and the sensitivity is set at R1. The circuit is from a 1993 Poptronics.
