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Hobby Circuits designed by Dave Johnson

Last Updated on: Tuesday, October 24, 2017 03:04 PM

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

Battery Charger Circuits
Circuits Designed by David Johnson, P.E. :

Eight-Solar Cell Lithium Ion Battery Charger Version 3


Improved Solar Path Light

Indicates Battery Charge Current





Lithium Battery Tester

Lithium Ion Solar Battery Charger-#2


Modified 4 D Cell LED Lantern

Modified Colman Lantern3

NMH/NiCd 6v Battery Tester



Solar 1w Cob LED Light

Solar Fireflies In Jar Light

Solar Lithium Ion Battery Charger using LT1129

Solar Path Light Improvement

Solar Powered Cell Phone Charger

Solar Powered Lighthouse

Solar Powered Lithium Ion Battery Charger

Solar Powered Mason Jar Light

Solar Powered Quartz Clock

Tool Shed LED Light

+5v Powered Charge Pump Battery Charger


1W Solar Path Light with COB

2-12v Battery Isolator Circuit with a LTC4412


6v NMH/NiCd Battery Tester

8 Solar Cell LED Light

8-Solar Cell Lithium Ion Battery Charger Version 2

Battery Amp-hour Capacity Tester

Battery Charge Current Indicator

Candle Power

Cell Phone Charger

Cell Phone Solar Powered Charger

Charge Pump Battery Charger-+5 Volts

Charging a 24v Battery Charger from a 12v Source

Circuit Indicates Battery Charge Current


Current Indicator for Battery Chargers

DIY Cell Phone Charger

Do It Yourself Portable Cell Phone Charger


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



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