This circuit can be used with 3 receivers and is intended for low frequencies (medium wave range). We found it in the September 1995 Electronics Now magazine.
This two-channel bargraph meter uses a single KAA2281 integrated circuit. Found in the January 1991...
This 80's circuit, suggested in Texas Insrtruments documentation, uses a Hall effect sensor. The...
A negative pulse applied to the input of the circuit shown in figure bellow turns on the relay....