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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, December 29, 2017 02:53 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!

Safety Circuits
 
Circuits Designed by Dave Johnson, P.E. :

AC Power Loss Alarm

Alarm Beeps when the “Check Engine” Light Turns On

Check Engine Beeper

Circuit Protects from Battery Polarity Reversal

Illuminated Banister

Infrared Safety Switch

Low Voltage 120vAC Power Line Alarm

Night Light from White LED

Power Line Alarm

Simple Circuit for White LED Night Light

Sound Triggered Night Light

120 VAC Low Voltage Alarm

12v Battery Load Cutout Circuit

18v AC to DC Power Supply

 

Dave's Circuits

Hobby Circuits

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

 

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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

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

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