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 delivers at its output a voltage that proportional to the amplitude of the input...
This circuit can be used to listen for SSB signals on receivers that do not have the built-in...
We found this circuit in a 1970 General Electric manual. The circuit uses components that are...