wrote in message
ups.com...

You could simply use 5 diodes in series to drop the 13v to 8v. Basic
1N4001 diodes would do fine. Cost a few p each.

Interesting idea, never heard of those before, but a few on ebay for next to
nothing. The camera's actually up and running now, using an old car voltage
adaptor, and some fancy wiring. However, it's enlightening to see other
potential solutions as it may well help the next time I want to do something
clever with a 12v supply!