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.
The components of this circuit are still common today. The circuit is from a 1967 publication by...
This analog TV circuit can be used on a small transmitter. The circuit is from an 80's American...
We found this circuit in a 1976 documentation. The FET can be BF245 or MPF102 and the power supply...