Found in the June 1987 issue of Radio Electronics magazine, this circuit uses well-known CMOS components. The circuit has a CMOS amplifier stage that drives a small speaker.
This symmetrical power supply appears in our section in many versions. This one is from the Radio...
To protect your home, vehicles or even objects, what we present is a sensitive alarm circuit that...
This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply...