On Sat, 14 Sep 2002, Jim wrote:

>   "And a heatsink [for the 7805] "
>
>NOT to beat a dead horse, but what are the power
>requirements so far and what is the expected
>power budget for any peripherals?

The horse is alive.

He said ~300mA @ 5V from nominally 12V wall wart (15-16V peak unloaded).
The usual calculations apply to come up with a terrific efficiency of 30%
or so. The switcher will improve this to 75%. We are looking at lowering
the dissipation in the regulator from 2-3W to under 1W, which is probably
ok for the regulator choosen, assuming an external diode is used (so the
reg will burn ~= 0.5W at correct design).

Peter

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