Re: Help Building a battery pack

From: pjdd@xxxxxxxxxxxxxx
Date: 5 Dec 2005 11:32:22 -0800

Some time ago, a friend asked me to rig up something for the same
purpose. In my part of the world, the original 7.2V pack is difficult
to get, quite expensive and doesn't last very long. OTOH, 6V
general-purpose sealed rechargeable batteries are cheap and easily
available. So I took two of them and used an LM317 IC to regulate the
resultant 12V down to 7.2V.

The camera now receives a constant 7.2V supply even when the 12V
battery voltage level varies from full charge to full discharge. He's a
semi-pro and doesn't mind the extra weight and bulk.

The linear regulator generates considerable heat when the camera is
running, so I used a fairly hefty finned heatsink from my junk box. A
switched-mode regulator would be more efficient but more complex.

.

Follow-Ups:
- but I just need to lower 1 volt
  - From: optimizer
- Thats the regulator I was looking at - how do I use it
  - From: optimizer

References:
- Help Building a battery pack
  - From: optimizer

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