This is the bad economy, we will find ways to better protect against identity theft, I recommend this circuit to help you. Burglar alarm systems Fridge door Alarm Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry This circuit, enclosed into a small box, is placed in the fridge [...]
Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 presents a high [...]
This low-cost burglar alarm employs a 12V strobe light and a truck reversing horn as the visible and audible alarm outputs while the alarm itself is a 12V horn relay and some pressure mat switches. This simple approach has the benefit that the alarm continues to operate even if the entry point is immediately closed [...]
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