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 found this circuit in a 1994 documentation. It was originally created to be used as a sign for...
Found in a Popular Electronics from the 80's, this bridge allows the measurement of resistances in 5...
This circuit covers 400 kHz to 40 MHz in three bands according to the selected coil. The double...