Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

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Hobby Circuits designed by Dave Johnson

Last Updated on: Friday, December 29, 2017 04:28 PM

List of Hobby 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!


Motion Sensor / Detector / Monitor Circuits
 
Circuits Designed by David Johnson, P.E. :

Detector for Human Footsteps

Earthquake Alarm Circuit

Footstep Alarm for Human Traffic

Front End + Power Supply Circuits of the Electric Filed Disturbance Monitor

Home Made Geophone Detects Foot Steps

Pressure_&_Motion_Test_for_Optical_Fibers

Scare Off Pigeons

Shadow Activated Motion Detector

Alarm Discriminator + Battery Monitor of the Electric Field Disturbance Monitor


 

Hobby Circuits by Category

Dave's Circuits

eMail:  David A. Johnson, P.E. about these circuits

 


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


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