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Circuits designed by David Johnson, P.E.
Last Updated on:
Monday, January 01, 2018 04:03 AM
List of Dave's Circuit Designs
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Fence Alarm
Designed by David Johnson, P.E. |
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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.
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| 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. |
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DC Magazine, Issue 2, Page 7 : Fence Alarm |
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