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

 

Last Updated: October 13, 2017 03:02 AM

Circuits Designed by Dave Johnson, P.E. :

NMH/NiCd 6v Battery Tester -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions.  As designed, the circuit applies a 10 amp load to the battery pack.  A heat sink must be used on the main power transistor . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

Measure Button Battery Cell's Internal Resistance  -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell.   This circuit when used . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006


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

Make a Simple Circuit Battery Status Monitor -  Monitor battery status with this easy electric circuit projectno skill required!. __ Designed by REUK-Renewable Energy UK website

Make a Simple Circuit PC-Based frequency meter  -  04/29/99  EDN-Design Ideas ?  NOTE :  Scroll to find this circuit.   A simple, low cost, and precision frequency meter uses only two pins of a pc parallel port (Figure 1). The TTL-level periodic input signal with frequency fIN connects to the ACK pin of LPT1. __ Circuit Design by Radovan Stojanovic, University of Patras, Patras, Greece

Measuring the Capacity of a Battery -  Find out how to measure the capacity of a battery. __ Designed by REUK-Renewable Energy UK website

Measure Button Battery Cell's Internal Resistance  -  The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell.  However, there is a relationship between battery health and the internal resistance of the cell.   This circuit when used . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Measuring the Charging & the Discharging Current Of the Battery -  Introduction When we work with rechargeable battery it is useful to have the following functions:* measuring the charging current * measuring the discharging current * measuring the voltage over the batteryBut in order to __ Electronics Projects for You

Microamps Monitor dual-supply batteries -  03/02/98 EDN-Design Ideas NOTE :  File contains many circuits, please scroll to find this one  The low-power circuit in Figure 1  monitors two 9V batteries in a dual-supply configuration and turns on the Battery Low LED if either battery voltage drops below its limit.  It also provIdeas two shutdown signals you can use to turn off voltage regulators, such as Maxim's MAX663/664 positive and negative. __ Circuit Design by Bruce Anderson, University of Wisconsin--Madison

Micropower DC/DC Converter with Independent Low-Battery Detector LT1304 -  DN120 Design Notes __ Linear Technology/Analog Devices

Model Aeroplane Navigation Strobe/Battery Level Indicator  -  If you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have.  An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn't seems to involve that sickening crunch __ Contact: r dot p @ webone.com.au

Monitor 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

Monitor Conserves Battery Energy -  04/19/12  EDN-Design Ideas Many battery-powered systems require a visual indication when the battery needs replacement.  LEDs often serve as the indicator, but they can draw as much as 10 mA of current.  This excessive current drain unduly accelerates the battery?s discharging and cu __ Circuit Design by Brian Huffman, Linear Technology Corp, Milpitas, CA

Monitor for 6V/12V Batteries -  Rechargeable batteries of 6V and 12V are used in a large number of applications.  It is imperative that these are maintained properly to get maximum life out of them.  Further, their __ Electronics Projects for You

Motor Accu Ladder -  Article is in Dutch __ Designed by Jan Hammer

My New Battery Desulfation/Tester -  This circuit helps to Desulfate Lead Acid batteries.  Added Bonus: This Circuit also gives a good indication of the Internal Resistance of the battery. __ Designed by G.L. Chemelec

NiCad Discharger for Tx & Rx Packs -  The reason I designed this discharger are many, however I will list a typical example.  A modeler charges his batteies for 14 hrs, then goes to the field for a fly.  He then rests for a week, then charges his batteries again for 14 hrs and flies again.  The third time, he repeats the procedure, then wonders why his aircraft has a major argument with the runway.  The problem with this method is that he is rechargeing a battey pack which after the first week, is in an unknown state of charge __ Designed by John Nooyen

NiCad Sensor for Heli -  NiCad Voltage Monitor for Rx   Circuit + Parts List + Notes __ Designed by Tony van Roon  VA3AVR

Nine-Volt Battery Voltage Monitor -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts.  It uses a LTC1440 comparator, which also contains a 1.18v reference diode.  In standby mode, the circuit draws only 4uA. . . Circuit by Dave Johnson P.E.-July, 2006

NMH/NiCd 6v Battery Tester -  I designed this circuit to test rechargeable six volt battery packs under constant current conditions.  As designed, the circuit applies a 10 amp load to the battery pack.  A heat sink must be used on the main power transistor . . . Hobby Circuit designed by David Johnson P.E.-December, 2004

Optimizing Bluetooth Device Battery Drain Measurements in Manufacturing -  Application Note__ Aligent

Overload & Reverse Currentry Protects Battery & LoA - D -  03/01/96 EDN-Design Ideas Battery-operated equipment is prone to the consequences of backward-installed batteries, accidental short circuits, and other careless use.  The effects of a reversed battery are critical.  Unfortunately, it's difficult to guard against a reversed battery.  To make __ Circuit Design by Dana Davis, Maxim Integrated Products

Preamp & 330 + MHz Prescaler -  A preamp that drives the CMOS counter input and a divide by 10 prescaler to extend the range __ Designed by Dick Cappels

Precision Audio Frequency Peak Detection Probe  -  This is a handy companion for a digital voltmeter.  Its allowed me to do a lot of things I used to use my oscilloscope for, and in addition it measures voltages to much greater precision.  Using an LM324 quad op amp, this peak detector provides 2% measurement accuracy on square waves from 5 Hz to 20 kHz. __ Designed by Dick Cappels

Prevent Deep Discharge of Battery -  09/26/96 EDN-Design Ideas NOTE : Page includes several designs, scroll to find this one.  mCs such as the 8051 and 8096 and UARTs such as the 82510 provide hardware support for a multiprocessor asynchronous serial-communication protocol (MicroLan].  This featu __ Circuit Design by Rolando Herrero, Instituto Tecnologico de Buenos Aires, Argentina

Protect Battery from Overdischarge -  04/12/01 EDN-Design Ideas All electronic circuits powered by a battery discharge the battery.  In some applications, it is undesirable to overdischarge the battery, because it could irreversibly reduce the battery?s capacity and the number of discharge/charge cycles.  The circuit in Figure 1 protectsPDF contains multiple circuits, scroll to find this circuit __ Circuit Design by Martin Wuzik, Implex AG Hearing Technology, Ismaning, Germany

Remote Charging uses Three Wire Sensing -  05/25/95 EDN-Design Ideas Remote voltage sensing usually uses a four wire sensing System, this System works with three Wires. __ Circuit Design by D Hayden, Tempo Research, Vista, CA

Remote control turns battery on & off -  09/12/97 EDN-Design Ideas The circuit in Figure 1 acts as a latching solid-state relay.  A short application of a magnetic field in the vicinity of S1 toggles the relay on and off.  The relay switches power from a 3V battery at load currents as high as 10 mA.  This remote switch is ideal for battery-powered applications.  In the off state, the circuit draws no current; in the on state, the circuit draws only 100 ?A.  All the parts are inexpensive and readily available. __ Circuit Design by Allen Harstine,Integrated Measurement Systems Inc, Beaverton, OR

Resistance Tester got UL Ground Requirement -  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

RF Inductance Meter -  needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn't need anything fancy, and since once a friend finishes his AT90S1200-based design, I plan to make one myself, I figured I'd use this for less than a year, so I didn't want to invest __ Designed by Dick Cappels


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

 


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