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.
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...
Found in General Electric documentation from 1967, this circuit uses an unusual PUT today. The...
This circuit, which uses a VU-meter with zero in the center of the scale, which is not easy to...