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 complex circuit with many digital components measures inductances in 6 ranges ranging from 100...
This circuit triggers a photographic flash when the microphone picks up a sound. The SCR can be...
This simple MW radio circuit with two transistors was obtained in an Argentine publication from...