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Battery Monitors / Testers
Battery Monitors
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Last Updated: November 21, 2017 05:44 AM

Circuits Designed by Dave Johnson, P.E. :

Small Battery Capacity Tester -  I have a client who uses a lot of batteries.  His sells a device which is powered by a 3v lithium coin cell and he sells thousands of them.  It seems that many of the batteries he has been importing from China have a milliamp-hour capacity which is much . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2008

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, 2001


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

Safely Deep-discharges NiCd battery  -  04/29/99  EDN-Design Ideas ?  NOTE :  Scroll to find this circuit.   Also available athttp://m.eet.com/media/1150682/25098-42999di     Nickel-cadmium (NiCd) batteries can possess an undesirable memory effect due to partial discharges.  The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. __ Circuit Design by Jim Hagerman, Science & Technology International, Honolulu, HI

Sailor?s Battery Meter -  On a sailboat, the condition of the battery is a major concern for obvious reasons.  On the author?s boat, a 120 Ah lead-acid battery is charged from a 25 watts solar panel.  The battery monitor described here was designed to give peace of mind.  It consists of two sub circuits: a sensor and a control/readoutmust register on this site __ Designed by Published in Elecktor July/Aug, 2010

Shunt Regulator Monitors Battery Voltage -  18-Sep-08 EDN-Design Ideas A shunt regulator and a handful of associated components function as a battery monitor __ Circuit Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine

Self-powered Fast Battery-Tester -  Tests 1.5 to 15 Volt cells; Two-LED display, no power supply required __ Contact: Flavio Dellepiane, fladello @ tin.it

Simple Circuit Battery-Status Indicator Uses Two LEDs -  08/12/10 EDN-Design Ideas Use LED brightness to indicate battery charge. __ Circuit Design by Abhijeet Deshpande, People?s Education Society Institute of Technology, Bangalore, India

Simple Circuit but reliable car battery tester -  This circuit uses the popular and easy to find LM3914 IC.  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. __ Designed by Jonathan Filippi

Simple Circuit Car Battery Charger psimages -  This very simple circuit uses a transformer , two diodes , a capacitor and an ammeter.  To charge a battery just connect+ and terminals of circuit to corresponding terminals of battery.  When battery is not charged, ammeter reading shows 1-3 amps|

Simple Circuit car battery Tester -  This circuit uses the popular and easy to find LM3914 IC.  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source __ Designed by Jonathan Filippi

Simple Circuit car battery voltage Monitor -  A Very Simple circuit and some Variations.  Play with it.  All parts are cheap and should be easily obtained. __ Designed by G.L. Chemelec

Simple Circuit disconnects loA - D -  02/17/00  EDN-Design Ideas Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1).  During shutdown, the disconnect completely isolates the battery __ Circuit Design by Larry Suppan

Simple Circuit Disconnects Load From Battery -  03/14/96 EDN-Design Ideas To prevent battery damage, the circuit in Figure 1 disconnects the load at a predetermined level of load voltage.  This load voltage, VTRIP, is closely proportional to the battery voltage.  R1 and R2 determine the level of VTRIP  that corresponds to voltage of 1.15V at pin 3 of IC1.  A voltage of 1.15V at pin 3 of IC1 causes the internal comparator to trip.  Thus, VTRIP=1.15(R1+R2)/R1 __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Simple Circuit indicates a Low battery -  02/03/14EDN-Design Ideas It may seem a bit counterintuitive to power on an LED when a battery is already low, but this Design Idea does it with aplomb __ Circuit Design by James Wood

Simple Circuit Monitors battery voltage -  11/21/96 EDN-Design Ideas The circuit in Figure 1 monitors four NiCd rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V.  The circuit consumes only 8 mA of current under normal operating conditions.   IC1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode.  The zener diode connects to the negative input of the comparator in the IC as a reference.  R6 and R7 divide the battery voltage __ Circuit Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA

Simple Circuit safely Deep-discharges NiCd battery  -  04/29/99  EDN-Design Ideas ?  NOTE :  Scroll to find this circuit.   Also available athttp://m.eet.com/media/1150682/25098-42999di     Nickel-cadmium (NiCd) batteries can possess an undesirable memory effect due to partial discharges.  The remedy is a complete discharge before charging again. Figure 1a shows a simple circuit that performs this feat. __ Circuit Design by Jim Hagerman, Science & Technology International, Honolulu, HI

Small Battery Capacity Tester -  I have a client who uses a lot of batteries.  His sells a device which is powered by a 3v lithium coin cell and he sells thousands of them.  It seems that many of the batteries he has been importing from China have a milliamp-hour capacity which is much . . . Hobby Circuit designed by Dave Johnson P.E.-September, 2008

Solid-state relays simplify Monitoring electric car battery-voltage -  02/19/04  EDN-Design Ideas Figure 1 shows the propulsion system of an electric vehicle.  It includes an electric motor, drive electronics, a mechanical transmission, vehicle control/power management, a charging system, and a battery.  The long-term performance __ Circuit Design by Robert Krause, Fairchild Semiconductor, San Jose, CA

T3SEType 3 (charge rate controlled) Solar Engines

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

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 0.1ohmsmodified on july 10, 2006 . . . Hobby Circuit designed by David Johnson P.E.-April, 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

TritiumType 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, 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 NiCd, 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 don?t 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, 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 it?s a low frequency spectrum analyzer based on Lanchpad TIVA Series from Texas Semiconductors.|


Battery Testers / Monitors:  #'s - A        B - F        G - L         M - R        S - Z


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