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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, November 30, 2017 10:29 AM

List of Dave's Circuit Designs

Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY CONTENT to your WEB SITE server!




Burglar Security Circuits
 
Circuits Designed by Dave Johnson, P.E. :

Alarm Sounds when Phone Line is Cut

Chain Link Fence Alarm

Cut Phone Line Alarm

Electric Field Disturbance Monitor-Alarm Discriminator Battery Monitor

Electric Field Disturbance Monitor-Front End Power Supply Circuit

Front End Power Supply Circuits of the Electric Filed Disturbance Monitor

Simple Circuit Wire Security Loop Alarm

Wire Loop Security Alarm

Alarm Discriminator Battery Monitor of the Electric Field Disturbance Monitor

Alarm for a Chain Link Fence


 

Dave's Circuits

Hobby Circuits

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Copyright  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 


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