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AA Battery Solar Charger (Solorb) - This almost trivial circuit may be used to
charge a pair of AA or AAA sized rechargeable battery cells from sunlight….
(circuit design added 8/03) |
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Amplified Zener - A 13 volt Zener diode will work well for charging a 12 volt
battery on Standby use. Or use a 14 volt zener a diode for a Standard 14.6 volt
charge…. (circuit / schematic design added 10/06) |
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Atmel Solar Panel Battery Charger - Batwatch is a simple monitor for a solar panel
battery charger, using an Atmel ATtiny13V. It periodically measures the charge current
and battery voltage, and shows them by blinking two LEDs. I built this circuit into
the plug of a VW solar charger panel that is used to prevent a discharge of the
battery when a car is not used for some time. A modern car contains a large amount of
electronics, and a quiescent current of 40-50mA (about 1Ah per day!) is considered
"normal". ….(circuit design added 11/08) |
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Automatic Trickle Charger - Scroll down to find this circuit. Here is the
schematic for the automatic charger I have been using for my kids' battery cars. The
charger is a small molded unit that probably doesn't supply more than an amp and this
circuit would have trouble with much more. No current limit is provided by this
circuit...(electronic schematic added 05/05/05) |
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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. ….(circuit
design added 04/09) |
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Battery Charge Current Indicator - This circuit turns on a LED whenever it detects
at least 25ma of battery charge current. (added 7/06) ….(designed by David A. Johnson) |
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Battery Charger (appnote) - (application / block diagram added 6/07) |
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Battery Charger (chemelec) - Current and Voltage Regulated for Sealed Lead Acid
types (electronic circuit added 10/06 |
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Battery Charger (sound.westhost) - Automatic Charger for Battery Operated Hi-Fi
Preamps (circuit added 6/07) |
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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.....(circuit design
added 05/06/07) |
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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....(circuit / schematic design added 6/06) |
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BattMan II: A Computer Controlled Battery Manager - design idea added 04/05/06) |
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Broken Charger-Connection Alert - Detects if a device is not properly connected to
its supply. Suitable for battery chargers, portable appliance supplies etc.
(added 3/050 |
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Build Your Own Solar Battery Charger - (circuit added 6/07) |
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Candle Power - A single lit candle in conjunction with an inexpensive thermopile
voltage generator provides enough power to charge a small battery when used with a
small low voltage DC to DC converter. Posted ….(designed by David A. Johnson) |
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Charge Monitor for 12 Volt Rechargeable Lead Acid Battery - (electronic Circuit /
Schematic added 10/04) |
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Yourself Portable Cell Phone Charger - It seems that as cell phones become more
sophisticated, their operating times become shorter and shorter. If you are on
the go all the time and have difficultly finding AC or DC outlets to charge your
phone, you might consider this simple scheme....(designed by Dave Johnson, P.E.) |
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Experimental Alternator Controller - Scroll down to find this circuit. Here
is an experimental (and simple!) regulator for alternator chargers. (schematic
added 05/05/05) |
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Fast PIC NiMH / NiCd Battery Charger - This battery charger charges a NIMH 5-pack
battery used in the BiPed robot in less than 1 hour, and charges the 10-pack NiCd used
in the Snuf robot in about 30 minutes. To prevent overheating of the battery, the
charging current is turned off when the slope of the battery-voltage turns from
positive into negative. A second termination-criterion of the charging process is
provided for safety: the charge time is limited to about 1 hour. ….(design added
11/08) |
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Intelligent NiCd/NiMH Battery Charger - This cheap and easy to build NiCd/NiMH
Battery Charger is suitable for automatically charging a wide range of batteries for
many applications. Proper chargers are usually expensive and cheap chargers supplied
with the original equipment often incorrectly charge the cells and dramatically
shorten their life. ….(electronic schematic added 11/08) |
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Intelligent NiCd/NiMH Charger/Cycler with 128x64 Graphical LCD - The accu cycler
project presented here is an excellent solution for charging and discharging NiCd and
NiMH accumulators for R/C modelers and others who make use of these accumulator types.
With its performance it is very close to the many of the commercial products available
on the market. ….(design added 11/08) |
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iPOD - MP3 Player Charger - Portable iPod charger that you can use while away from
your computer. The circuit is based around an MC34063 switchmode regulator. This has
high efficiency so that there is very little heat produced inside the box, even when
delivering its maximum output current. The circuit is more complicated than if we used
a 7805 3-terminal regulator but since the input voltage could be 15V DC or more, the
voltage dissipation in such a regulator could be 5W or more at 500mA. and 5W is far
too much for a 7805, even with quite a large heatsink. ….(design added 11/08) |
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Li-ion Battery Charger - This is a charger for lithium ion batteries which takes
its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion
battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863 are
advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management devices
allow these peripherals to utilize the full power of the USB port. ….(design added
11/08) |
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Li-Po Charger and Balancer - This is a Li-Po charger and balancer project for R/C
hobby.The charger circuit is based on the circuit of Electron head and all folks in
the DIY electronics topic on the rcgroups.com. ….(design added 11/08) |
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Lithium Ion, Lithium Poly Charger Circuit - The above circuit will charge any
2-cell * Li-Ion battery pack. Maximum current is about 650 milliamps. The circuit is
designed for batteries of 900mah or higher. Note this circuit is NOT for Li-Metal
batts (i.e. Duralites). Power source can be a 12v Gell cell (Power panel), or can be
powered by a car's cigarette lighter. I use an old 12v DC wall transformer (800ma or
more.) Radio shack sells a 12v/1amp wall DC adapter #273-1776 that will work. Supply
does not need to be regulated. In fact my cheap supply outputs 17 volts with no load.
….(circuit design added 11/08) |
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Multi NiCad Charger - ….(circuit design added 05/09) |
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Muscle power drives battery free electronics - 11/21/05 - EDN-Design Ideas:
Your sweat and a super-cap replace the battery.....(design idea added 10/06) |
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Nicad Battery Charger - This simple charger uses a single transistor as a constant
current source. The voltage across the pair of 1N4148 diodes biases the base of the
BD140 medium power transistor. The base- emitter voltage of the transistor and the
forward voltage drop across the diodes are relatively stable. The charging current is
approximately 15mA or 45mA with the switch closed. This suits most 1.5V and 9V
rechargeable batteries. ….(electronic schematic added 11/08) |
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Nicad Battery Charger - (schematic added 10/06) |
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Ni-Cd Charger - This is a NiCd/Ni-MH charger that can charge with constant current
and automatic charge termination when the total voltage for all cells reach the
setting voltage. ….(electronic schematic added 11/08) |
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NiCd Charger with Thermal Peak Detection - The electric model aircraft and car
industries have produced a bewildering array of field chargers for NiCd motor battery
packs. These range from simple 6 or 7 cell chargers consisting of a resistor and
mechanical timer, to more complex chargers with peak detection, cycling, and the
ability to handle 36 cell packs. ….(design added 11/08) |
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Picref-5: Smbus Level-3 Battery Charger/Selector Reference Design Based on the
PIC16C73a - Microchip Application Note Published 11-May-98 (app note added
2/06) |
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Power Supply 5v Solar - This project uses the 1.2v rechargeable battery and solar
panel from a Solar Garden Light. These lights can be bought for less than $5.00 in
most $2.00 shops or similar shops that sell general household items diagram….(circuit
added 05/07) |
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Powered AA NiMH and NiCd Battery Charger - ….(schematic added 05/09) |
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Pre-Charged (Low Self-Discharge) Rechargeable Battery Roundup - ….(design added
03/09) |
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Salt Water Battery - (electronic circuit added 10/05) |
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Simple Lithium-ion / Lipo Battery Charger - This is a Lithium-ion charger for lipo
batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery
but voltage can be set to charge several batteries in series. Lipo charger sets a
current limit with the LM317, and 1 resistor, and the voltage limit with the TL431,
and 2 resistors. 1K resistor is needed to let the TL431 decrease the LM317 current,
and to provide the necessary current to the TL431. The optional Schottky diode at the
output will prevent current flowing back from battery to the charger circuit when
power is disconnected, and reverse biasing of the LM317. Power supply with more than
3V above output voltage is required. ….(electronic schematic added 11/08) |
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Smart Battery Charger - ….(electronic schematic added 03/08) |
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Solar Battery Charging - This instructable will show you how to make your own
solar battery charger from very simple components. It is taken from my documentation
provided with a kit I supply - you should easily be able to source the same components
yourself of course. ….(circuit design added 11/08) |
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Solar Cell Battery Charger - A Simple Regulator for Charging Lead Acid Batteries
from a Solar Cell.….(electronic circuit added 10/06) |
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Solar Cell Phone Charger - This little gadget uses a small 3 volt solar cell to
charge a 6 volt NiCad battery pack which, in turn, may be used to charge many models
of cell phones and other portable devices. The circuit "scavenges" energy from the
solar cell by keeping it loaded near 1.5 volts...(circuit added 05/05/05) |
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Step Up supply charges battery while serving load - 06/08/95 - EDN-Design Ideas:
The circuit in Fig 1 supports portable applications in which a microprocessor controls
battery charging. Step-up switching regulator IC1 boosts VIN (5V)to supply a
combination of charging and load current. (Note that the 5V source must have
short-circuit protection.)IC2 is a high-side current-sense amplifier that monitors
charging current.....(design idea added 11/05) |
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The Amplified Zener - A 13 volt Zener diode will work well for charging a 12 volt
battery on Standby use. Or use a 14 volt zener a diode for a Standard 14.6 volt
charge…. (circuit / schematic design added 10/06) |
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Two 12v Battery Isolator - Linear Technology has just announced a neat little chip
(LTC4412). It has been designed to be used in conjunction with an external P-channel
power FET, to form an ideal diode function with a very low 0.05v voltage drop. The
chip monitors the voltage on either side of the FET. As long as the voltage on the
drain side is greater than the source side, the FET is turned on.... ….(designed by
David A. Johnson) |
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U-131 Simple Switchmode Lead-Acid Battery Charger - U-131 APPLICATION NOTE.
The charger circuit implements a two loop control. system with the current loop
operating inside the. voltage loop. During trickle-charge, bulk-charge and …(app note
6/07) |
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USB Li-ion Battery Charger - This is a charger for lithium ion batteries which
takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863
Li-ion battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863
are advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management
devices allow these peripherals to utilize the full power of the USB port. ….(design
added 11/08) |
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USB Powered AA NiMH and NiCd Battery Charger - ….(schematic added 05/09) |
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USB-Powered Lithium-Ion Battery Charger - With a maximum power rating 5.25V/500 mA,
the USB power bus is a great source for charging a single-cell Lithium-Ion battery.
The circuit in Figure 1 shows how to build a USB-powered single-cell Li-Ion battery
charger using National Semiconductor s LM3622 Li-Ion Battery Charger Controller.
….(design added 11/08) |
