This simple circuit, found in American documentation, uses only one relay that locks when any of the sensors is activated. To reset, simply turn off the power for a moment.
This circuit generates a signal for double conversion receivers. The signal has the frequency...
a This very low voltage regulator supports input voltages from 1.7 V to 5.5 V and is suitable for IoT...
This timer, using the ZN1034E, is from a May 1987 Radio Electronics magazine. The circuit can...