Using a sensor from the time, this circuit was found in the 1992 Radio Electronics Handbook magazine. The circuit uses a pair of integrated two-digit A/D converters.
This circuit, obtained in an old publication, causes a second telephone bell to be played in a...
This circuit is from the 1982 SGS Linear Circuits Manual. The circuit provides currents from 35 mA...
This circuit generates pulses of up to 60 seconds with a short reset time. The circuit is from an...