We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
This circuit was found in an English magazine from 1976. The transistors can be the BC548. The...
Avago Technologies (www.avago.com) suggests the circuit in Figure 9 for amplifying signals of...
The circuit presented shows how to use a diode in temperature compensation of a push-pull output...