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Battery Chargers
All Battery Chargers:   #'s - B       C - K      L - R       S - Z

Also see:      Alkaline       Lead Acid        Lithium      Nickel

Last Updated: December 07, 2017 02:04 PM

Circuits Designed by Dave Johnson, P.E. :

Battery Amp-hour Capacity Tester   -  I bought some lithium ion rechargeable batteries a while back.  I was planning on using them to modify some solar powered LED spot lights.  What I like about these new batteries is that they are the same size as a standard 1.5v alkaline AA cell . . . Circuit by Dave Johnson P.E.-February 05, 2012

Battery Charge Current Indicator   -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current . . . Circuit by Dave Johnson P.E.-July 23, 2006

Battery Charging Generator Starter -  As the drawing below illustrates, the alternator was wired in a three phase “Y” configuration.  By making a few changes, the alternator could be turned into a very powerful motor.  The motor had the advantage of being able to draw current from the main battery bank.  Using this method, the company’s control system would just need to activate a relay to switch the battery between the rectifier circuit and a brushless DC motor configuration. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 17 Mar 2011



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

Battery (NiCad) Rejuvenator -  Don't throw away those seemingly un-chargeable, rechargeable batteries; they could very well be brought back to life with the aid of this simple circuit.    (Tony van Roon's Tony van Roon) __ Designed by Tony van Roon  VA3AVR

Battery Amp-hour Capacity Tester -  I bought some lithium ion rechargeable batteries a while back.  I was planning on using them to modify some solar powered LED spot lights.  What I like about these new batteries is that they are the same size as a standard 1.5v alkaline AA cell. . . Circuit by Dave Johnson P.E.-February, 2012

Battery Box -  When an application or circuit is powered by batteries the device comes under a criteria of obligation.  If a rechargeable power source is not being used then the batteries have to be replaced quite often in a high drain circuit __ Contact: Collin Mitchell

Battery Charge Current Indicator -  This circuit turns on a LED whenever it detects at least 25ma of battery charge current. . . Circuit by Dave Johnson P.E.-July, 2006

Battery Charging Generator Starter -  As the drawing below illustrates, the alternator was wired in a three phase “Y” configuration.  By making a few changes, the alternator could be turned into a very powerful motor.  The motor had the advantage of being able to draw current from the main battery bank.  Using this method, the company’s control system would just need to activate a relay to switch the battery between the rectifier circuit and a brushless DC motor configuration. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 17 Mar 2011

Battery charger -  This project is not so important for those who ride a car every day.  In my case, a car is not used every day.  In that case, the voltage of a battery is falling and a car sometimes cannot be put into operation __ Designed by Seiichi Inoue

Battery Charger 110 to 12 volt Non-Isolated type -  POSSIBLE SHOCK HAZZARD, A Good Simple Charger, BUT When Charging, This Circuit and the circuit it is connected to, MUST BE ISOLATED FROM THE USER. __ Designed by G.L. Chemelec

Battery Charger 12v SLA -  Before we go into the operation of the SLA Battery Charger circuit, there are a number of points we need to cover about the care and use of Sealed Lead Acid batteries.  Firstly, these batteries must be charged, discharged and stored very carefully.  We normally think batteries can be stored for months   (if not years) and they will be available for immediate use __ Designed by Collin Mitchell

Battery Charger Current & Voltage Regulated for Sealed Lead Acid types -  Current and Voltage Regulated for Sealed Lead Acid types __ Designed by G.L. Chemelec

Battery Charger Display Using LT1639 -  The Over-the-Top type of operational amplifier is ideal for use as a current sense for battery charger applications.  The design described here can be used with chargers for rechargeable batteries (Lead/acid or NiCd etc).  The 5 V operating supply for the circuit is derived from the battery on charge.  The circuit uses a sense resistor|

Battery Charger Indicates Rate of Charge -  05/25/95 EDN-Design Ideas A single LED indicates wher  battery Chargers s delivering a trickle charge or a fast charge, Circuit designed to charge2-14 cells. __ Circuit Design by Larry Suppan, Maxim Integrated Products, Sunnyvale, CA

Battery Charger Takes on Two Roles -  01/01/98 EDN-Design Ideas The NiCd and NiMH
battery charger in Figure 1 applies a battery fast-charge controller IC in a way that not only provIdeas peak-voltage fast-charge termination--as IC was designed to do--but also precisely regulates  charge curre __ Circuit Design by Thomas A Somerville, Motorola SPS, Tempe, AZ

Battery Charger Trickle-Charges From Line Source -  07/04/96  EDN-Design Ideas For trickle-charging low-power products such as shavers, yard and power tools, and flashlights, the Unitrode UCC3890 off-line, battery-charger IC provIdeas 1 to 2W of constant-current or -voltage charge from 100 to 400V dc.  The device charges single-cell r __ Circuit Design by Bill Schweber, Unitrode Corp, Merrimack, NH

Battery Charger with Automatic Switch-Off -  This smart charger automatically switches off when your rechargeable batteries reach the full charge.  The circuit comprises a bistable multivibrator wired around timer IC 555.  The bistable output is fed to an __ Electronics Projects for You

Battery Charger with LM317 -  LM317 regulator is used to regulate the voltage and current for this circuit.  This battery charger should be used only for Ni-Cad cells.  Other type of batteries   (li-ion, NiMH
, Lead and Li-ion polymer) needs special care so it cannot be used. __ Designed by Jose Pino

Battery Deep Discharge Saver -  This circuit can be used to ensure that a 12V sealed lead-acid battery does not go into the condition of deep discharge.  The circuit disconnects the battery from load when its __ Electronics Projects for You

Battery Equal Charge Indicator -  The circuit below illuminates an LED to indicate unequal charges between two 12 volt lead batteries.  It can be used to verify that two batteries are connected in parallel or isolated since the LED will be off when the voltages are equal within a tollerance, or on if the voltage difference is greater than 100 millivolts.  Three comparators __ Designed by Bill Bowden

Battery Extends Power over Ethernet Poe Peak Current -  DN361 Design Notes__ Linear Technology/Analog Devices

Battery Rejuivnator for Lithium Batteries -  These batteries are Not Rechargable.  But you can get Considerable Extra Life in this way __ Designed by G.L. Chemelec

BattMan II: a Computer Controlled Battery Manager -  BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. __ Designed by Stefan Vorketter

Bidirectional Power Inverter -  08/02/01  EDN-Design Ideas If you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer.  One implementation is the symmetrical flyback converter shown in Figure 1.  The circuit __ Circuit Design by Tom Napier, North Wales, PA

Broken Charger-Connection Alert -  Detects if a device is not properly connected to its supply.    Suitable for battery chargers, portable appliance supplies etc. __ Contact: Flavio Dellepiane, fladello @ tin.it

Buck converter charger also provides system power -  11/16/96 Literature Number: SNVA532Switching Regulator providescharge voltage setpoint with Current regulation, and second Switching Regulator provides 5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery is best choice because of high capacity and relatively low cost.  The battery charges __ Designed by Application Note Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Buck-converter charger also provides system power -  05/22/97 EDN-Design Ideas Switching Regulator provIdeas  charge voltage setpoint with Current regulation, and second Switching Regulator provIdeas5V System Power -Many systems require long-time operation during periods of power loss.  Often, a gel or wet-cell lead-acid battery is  best choice because of high capacity and relatively low cost.  The battery charges __ Designed by Robert Hanrahan, National Semiconductor, Woodcliff Lake, NJ

Build a High Speed NiCd Charger for Electric R/C -  A few years back, I published a design for a Low Cost Thermal Peak Detection Charger.  Since then, I've designed several other chargers, in my ongoing quest to avoid having to spend money.  Of course, in building all these designs, I've probably spent more than a really good commercial charger would have cost me.  But designing and building is half the fun __ Designed by Stefan Vorkoetter

Build a Simple Circuit Rechargeable CMOS Battery -  Occasionally we come across a computer motherboard that seems to eat those CR2032 batteries every 4 to 5 months.  This is particularly frustrating because the computer works perfectly once booted but all the important BIOS settings are lost when the CR2032 battery fails.  This is very irritating if the affected computer will not boot up with the default BIOS settings.  I recently had a computer motherboard with this same irritating phenomenon.  A test revealed that the current drain __ Designed by Radio Amateur Society of Norwich N1HFX

Build a USB Powered AA NiMH
& NiCd Battery Charger
-  I’m always complaining about all the chargers and wall warts I need to carry with me when going on a trip.  This project, which can charge a pair of AA Nickel Metal Hydride   (NiMH
) or Nickel Cadmium   (NiCd) cells using a laptop’s USB port for power, arose to address part of that problem. __ Contact: Stefan Vorketter

Build Your Own Solar Battery Charger -  For this project I used 12 cells but you really only need 6.  So if you are on a budget use 6 but if you want a fast charger use 12.  Next lay out all your cells on your window to make sure everything is going to fit.  I used the "deeper" side of the window so that there would be more room

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Battery Charger Circuits:  #'s - B       C - K      L - R       S - Z


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