Found in an Electronic Design from the 90s, this circuit measures the phase difference between two signals using an electronic multimeter. The circuit makes use of components of the time.
Suitable for clandestine listening and in SMD assembly, this circuit was found in the Radio...
This alarm circuit was found in the July 1992 Radio Electronics magazine. The circuit uses a small...
This system makes use of incandescent lamps only and uses a SCR with a full wave bridge for powers...