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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. |
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12V / 7.2A battery charger |
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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. |
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A Solar Cell Battery Charger - A Simple
Regulator for Charging Lead Acid Batteries from a
Solar Cell. |
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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… |
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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. |
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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". |
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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.. |
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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. |
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Battery Charge Current Indicator - This circuit
turns on a LED whenever it detects at least 25ma of
battery charge current. |
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Battery Charger (appnote) |
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Battery Charger (chemelec) - Current and Voltage
Regulated for Sealed Lead Acid types |
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Battery Charger (sound.westhost) - Automatic
Charger for Battery Operated Hi-Fi Preamps |
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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. |
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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 tolerance, or on if
the voltage difference is greater than 100
millivolts. |
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BattMan II: A Computer Controlled Battery Manager |
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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. |
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Build Your Own Solar Battery Charger |
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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. |
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Charge Monitor for 12 Volt Rechargeable Lead Acid
Battery |
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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. |
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Experimental Alternator Controller - Scroll down
to find this circuit. Here is an experimental (and
simple!) regulator for alternator chargers. |
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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. |
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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. |
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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. |
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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
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. |
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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. |
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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. |
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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. |
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Multi NiCad Charger |
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Muscle power drives battery free electronics -
EDN-Design Ideas: Your sweat and a super-cap
replace the battery |
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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. |
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Nicad Battery Charger |
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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. |
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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. |
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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 |
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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… |
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Powered AA NiMH and NiCd Battery Charger |
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Pre-Charged (Low Self-Discharge) Rechargeable
Battery Roundup |
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Salt Water Battery |
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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. |
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Smart Battery Chargera |
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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. |
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Solar Cell Battery Charger - A Simple Regulator
for Charging Lead Acid Batteries from a Solar Cell. |
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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. |
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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.. |
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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… |
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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.. |
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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.... |
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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. |
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USB Powered AA NiMH and NiCd Battery Charger |
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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. |
