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1.3V Power Supply - This is a replacement power source for 1.3V mercury cells or or small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital rmometer.
12V / 7.2A battery charger
5v Solar Charger - 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.
A Solar Cell Battery Charger - A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell.
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…
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.
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".
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..
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.
Battery Charge Current Indicator - This circuit turns on a LED whenever it detects at least 25ma of battery charge current.
Battery Charger (appnote)
Battery Charger (chemelec) - Current and Voltage Regulated for Sealed Lead Acid types
Battery Charger (sound.westhost) - Automatic Charger for Battery Operated Hi-Fi Preamps
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.
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 tolerance, or on if the voltage difference is greater than 100 millivolts.
BattMan II: A Computer Controlled Battery Manager
Broken Charger-Connection Alert - Detects if a device is not properly connected to its supply.  Suitable for battery chargers, portable appliance supplies etc.
Build Your Own Solar Battery Charger
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.
Charge Monitor for 12 Volt Rechargeable Lead Acid Battery
Do It 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.
Experimental Alternator Controller - Scroll down to find this circuit.  Here is an experimental (and simple!) regulator for alternator chargers.
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.
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.
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.
iPOD - MP3 Player Charger - Portable iPod charger that you can use while away from your computer. The circuit is based around an MC34063 switch mode 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.
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.
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.
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.
Multi NiCad Charger
Muscle power drives battery free electronics - EDN-Design Ideas:  Your sweat and a super-cap replace the battery
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.
Nicad Battery Charger
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.
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.
Picref-5: Smbus Level-3 Battery Charger/Selector Reference Design Based on the PIC16C73a - Microchip Application Note Published 11-May-98
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…
Powered AA NiMH and NiCd Battery Charger
Pre-Charged (Low Self-Discharge) Rechargeable Battery Roundup
Salt Water Battery
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.
Smart Battery Chargera
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.
Solar Cell Battery Charger - A Simple Regulator for Charging Lead Acid Batteries from a Solar Cell.
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.
Step Up supply charges battery while serving load  - 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..
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…
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..
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....
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.
USB Powered AA NiMH and NiCd Battery Charger
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.
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