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 interesting circuit provides an output proportional to the input voltage, regardless of its...
The proposed circuit generates signals in the range between 9 kHz and more than 44 kHz, which, it is...
A modulated (intermittent) siren, using the four gates of the 4001 integrated circuit is shown in the...