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Last Updated on: Thursday, November 30, 2017 07:43 AM

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Fence Alarm
Designed by David Johnson, P.E.


Problem: 
It was deer hunting season and cattle rancher was fed up with hunters cutting his barbed wire fence, to gain entrance onto his property.  The rancher want to be alerted when the barbed wire was cut.

 

Solution:   The circuits below is placed inside a small plastic box which is placed inside the house.  A power jack for the +12v input and a terminal block for the earth ground and sensor wire connections are installed.  Two additional terminals were connected to a siren.  Central to the design is a closed pushbutton switch.  When pressed, the button would test the circuit by simulating a broken fence wire.

Wily Widget's Wire Fence Alarm schematic

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DC Magazine, Issue 2, Page 7 :  Fence Alarm


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