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.
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
This circuit was obtained in a 90s Popular Electronics. It is used for tuning on AM radios. The...
We found this circuit in the May 1972 issue of Radio Electronics magazine. Its purpose is to teach...