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wire loop alarm (1N4007)

2016-02-20 14:29  
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This article describes a wire loop alarm (1N4007). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: 1N4007.

This circuit is a simple wire loop alarm that can be used
in doorways, hallways, or any other place the tripwire will be
broken by intruders. The circuit has a built in siren, but it can
be replaced by a relay to drive an external siren, commercial
alarm, etc.


alarm1 wire loop alarm

Notes:

1. Email Alex Meaden with questions, comments, etc.

2. The loop can be any type of hookup wire, with a maximum
resistance of about 90K. Using very thin wire (40AWG, for
example) will make a very sensitive trip wire, but will shorten
the distance it can be strung due to the high resistance.

3. The siren can be replaced with a relay to drive external loads.

 


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