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


Text & Graphics Copyright David A. Johnson, PE  --  ALL Rights Reserved.
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Gadget Circuits
Circuits Designed by Dave Johnson, P.E. :

Chicken Coop Door Opener with Timer

Click Sound Generator

Coin Operated Telescope

Color Film Makes Optical Filter

Corona Monitor

DC Current Indicator 6

Door Knob Alarm

Door Knock Beeper

Electrical Device Harvests Earthworms

Honeybee Counter

Night Light from White LED

Remote Doorbell Beeper

Simple Circuit for White LED Night Light

Vertically Lifting Security Gate Power Source

Voltage to Frequency Converter + 1us LED Pulse Driver

Wave Power Generator Demo System

120 VAC Touch Switch

4-20ma Current Loop Tester

60 Watt Lamp with Auxiliary 14v LED Lamp

6v NMH/NiCd Battery Tester

AC Current Controls Hour Meter

Automotive Electrical Voltage Indicator

Basement Doorbell Beeper


 

Dave's Circuits

Hobby Circuits

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HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
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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