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Battery Charge Current Indicator
This circuit turns on a LED whenever it detects at least 25ma of battery charge
current.... [Hobby Corner Circuit by Dave Johnson]
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
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
Solar
Powered Lithium Ion Battery Charger uses a LTC1734
The circuit below feeds a controlled current and voltage to a 3.6v lithium ion battery.
The current is limited to 300ma and the voltage is limited to 4.2 volts. The circuit
uses a LTC1734 IC from Linear Technology. No diode is needed between the circuit and a 6
volt solar panel....
Two 12v Battery
Isolator with a LTC4412
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....
