The track issued by the buzz and / or light-emitting diodes to illuminate when someone touched the door handle from the outside. Sound the alarm until the circuit will switch to shut down.
The whole track is closed in a small plastic or wooden box, and should be hanged up the door way to deal with [...]
Alternative version of the popular circuit
3V battery supply - Still operating at 1.3V
This is due to the use of CMOS integrated circuits 4060. In some cases, some of the equipment made by the manufacturer (rather than the Motorola) does not run, even in the name of 3V supply voltage.
A simple treatment, can be an [...]
Beeps if you leave open the door over 20 seconds
3V battery operation, simple circuitry
The track, closed into a small box, placed in the refrigerator in the vicinity of the light (if any) or open. With the closed doors inside the refrigerator is in the dark, the photo resistor R2 made the anti-high ( “200,000), thus [...]
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