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Old Feb 12, 2003, 12:38 AM
billystiltner is offline
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United States, VA, Clintwood
Joined Nov 2002
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DIY simple lipoly charger

hey

i put together a charger from radio shack parts .
you can get the schematics and info on how to modify it for your cellpacks here.
http://www.shdesigns.org/lionchg.html

i used the simple design and measure the voltage with a voltmeter while charging so i dont overcharge.

my charger has been modified for a single cell 145mah lipoly
the values i changed are as follows
R1 = 5 ohm(i used two 1/4watt 10 ohm in parallel)
R3 = 1000 ohm (this lets you charge a single cell the original circuit was for charging 2 cells)

construction took about an hour and a half most of the connections between parts can be done with the component legs i had to use 2 wires and none of the connections overlap so all the soldering can be on 1 side of the board.

for the 12 volt supply i used a spare computer power supply.
for the heatsink i used a peice of aluminum soda can folded all up.

i will post a graph or just the actual numbers of the voltage and current vs time after i drain and recharge my battery.


here are some pics.

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Last edited by billystiltner; Feb 12, 2003 at 12:41 AM.
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