On Mon, 19 Nov 2007 12:45:57 +0000, Tim Newport-Peace wrote:

Not using diodes is good.

I use two diodes to provide a "fail safe" supply to the equipment that
draws low current but requires high availability, like the Volkslogger.

Two very small cheap rectifying diodes do a very effective job with
negligible voltage drop (about 0.1V), no heat sinks etc.

The high current equipment (radio, transponder etc) is powered directly
from alternate batteries via change over switches. But these normally
don't mind a short duration interruption.


Ian