Bob,

I re-ran the Bspice simulation with the following assumptions:

Power supply 5 volts with 0.7Vp-p ripple

Battery 4.5V  modeled as a 3V source with 3 ohm series resistance
Pic input in 3 different states - open, high and low


With the pic output open or low, the current in the battery was essentially
zero

With the PIC output at 5V, the current into the battery was
29.7mA  to 6mA
while the power supply ripple was 5.7 to 4.3V


I'm scratching my head about the constant current regulation right now.

Anybody else use Bspice?

-- Lawrence Lile

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