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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 Testers / Monitors
Circuits Designed by David Johnson, P.E. :

Ground Resistance Tester

Lead-Acid Battery Low Voltage Indicator

Lithium Battery Tester

Low Battery Voltage Flasher

Low Voltage Indicator for Lead-Acid Battery

Measure Button Battery Cell's Internal Resistance 

Nine-Volt Battery Voltage Monitor

NMH/NiCd 6v Battery Tester

Resistance Tester got UL Ground Requirement

Small Battery Capacity Tester

Test UL Ground Resistance

Tests UL Ground Resistance

UL Ground Resistance Tester

Voltage Monitor for a 9v Battery

12v Battery Voltage Monitor-Expanded Scale 

3 Volt Low Battery Voltage Flasher

6v NMH/NiCd Battery Tester

9v Battery Voltage Monitor

Alkaline Low Battery Voltage Indicator

Button Battery Cell Internal Resistance Measurement

Expanded Scale 12v Battery Voltage Monitor


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



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