DIY simple lipoly charger
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.
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.