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Battery Testers
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Last Updated on:
Monday, January 01, 2018 04:03 AM

Circuits Designed by Dave Johnson, P.E. :

Test UL Ground Resistance  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by David Johnson P.E.-April 28, 2001

Tests UL Ground Resistance  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.  This resistance must be tested with actual line current in excess or 10 amps.  The circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than 0.1ohms - modified on july 10, 2006 . . . Hobby Circuit designed by David Johnson P.E.-April 28, 2001

UL Ground Resistance Tester  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by Dave Johnson P.E.-April 28, 2001

Voltage Monitor for a 9v Battery  -  Nine voltage batteries are used in a wide variety of electronic devices.  But, you often donít know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be . . . Hobby Circuit designed by David Johnson P.E.-July 09, 2006


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Test batteries without a voltmeter  -  11/09/00 EDN Design Ideas:  The circuit in Figure 1 is an easy approach to testing batteries without exiting the voltmeter.  The battery holders in sizes AAA, AA, C, and D make this tester so much faster than a voltmeterPDF contains multiple circuits, scroll to find the one of interest __ Circuit Design by Nam Phan, Pasadena, CA

Test batteries without a voltmeter, part 2  -  03/03/01   EDN Design Ideas:  From a high-volume-production point of view of the Design ideas - "Test batteries without a voltmeter " (EDN , Nov 9, 2000, pg 167) , it is a time-consuming and laborious task to tweak the large number of potentiometers on each of the comparator input refere __ Circuit Design by Harry Gibbens Jr

Test UL Ground Resistance  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by David Johnson P.E.-April 28, 2001

Testing Sanyo's Eneloop Low Self-Discharge Rechargeable Battery  -  Late in 2006, I found out about Sanyo's new Eneloop Nickel Metal Hydride (NiMH) rechargeable batteries, available in AA and AAA cell sizes.  Unlike regular NiMH offerings from other vendors (e.  g.  Duracell, Energizer, Gold Peak) , Sanyo claimed the following benefits for their Eneloops __ Designed by Stefan Vorketter

Tests UL Ground Resistance  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.  This resistance must be tested with actual line current in excess or 10 amps.  The circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than 0.1ohms - modified on july 10, 2006 . . . Hobby Circuit designed by David Johnson P.E.-April 28, 2001

The Battery Guardian  -  Don't get caught with a flat battery; this easy-to-build circuit can cut off the power to a 12V fridge or car stereo system if the battery voltages drops below critical level.__ SiliconChip

Tritium - Type 3 (charge rate controlled) Solar Engines

TRUE RMS-TO-DC Adapter for DVM  -  The main differences between one of the application circuits in the AD737 data sheet are the addition of a MCP1702 micropower 3.3  volt regulator to split the power supply and two 11 volt zener diodes to prevent the voltage across the chip to become high enough to damage the chip in case the input is connected to an excessive voltage while in the 200 mv full scale setting.  __ 

UL Ground Resistance Tester  -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by Dave Johnson P.E.-April 28, 2001

Using the LTC1325 Battery Management Ic  -  AN64 App Note 64 details characteristics of various battery types and appropriate charging management schemes.  The LTC1325 battery management IC is highlighted along with information for applying it to any type battery.  Techniques and circuitry for conditioning, charging and monitoring NIC d, NiMH, Li-ion and Lead-Acid batteries are presented.  __ Linear Technology/Analog Devices

UVP protects rechargeable batteries  -  EDN Design Ideas:  04/11/2016    Protect rechargeable batteries from deep discharge with this UVP & load switch. __ Circuit Design by Peter Demchenko

Virtual 9 V Battery  -  PP3-size 9 V batteries (iEC: 6LR22) have a considerably poorer price/energy ratio than 1.5 V AA (iEC: LR6) cells.  This makes it all the more unfortunate when you accidentally leave a device switched on!  The author uses a number of such devices and so started looking for a solution to this problemmust register on this site __ Designed by Published in Elecktor July/Aug, 2010

Voltage Monitor  -  This voltage monitor circuit is based on an Elektor design with a 555 timer IC in the book 302 Circuits, which uses two LEDs (red and green) to indicate whether the voltage is within range.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Voltage Monitor  -  When the input voltage is 0 the LED glows.  The LED stops glowing when the voltage rises to the level determined by R2.  Reverse + and, pins to reverse operating mode.  To set voltage at which LED goes  __ Contact IQ Technologies

Voltage Monitor  -  When the input voltage is 0 the LED glows.  The LED stops glowing when the voltage rises to the level determined by R2.  Reverse + and, pins to reverse operating mode.  To set voltage at which LED goes  __ Contact IQ Technologies

Voltage Monitor for a 9v Battery  -  Nine voltage batteries are used in a wide variety of electronic devices.  But, you often donít know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be . . . Hobby Circuit designed by David Johnson P.E.-July 09, 2006

Voltage Monitor Prevents Deep Discharge of Battery  -  09/26/96 EDN Design Ideas:  To avoid the deep discharge that can destroy or shorten the life of a rechargeable battery, you must disconnect its load before the discharge is complete __ Circuit Design by Ron Clark and Larry Suppan, Maxim Integrated Products

Voltage Monitor with LED indicator  -  This project is an accelerometer data acquisition system for automotive suspension analysis.  In other words itís a low frequency spectrum analyzer based on Lanchpad TiVA Series from Texas Semiconductors.__ 


Battery Testers
Battery Testers:  #'s - A      B - D      E - L      M -
S     T - Z


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