Jai wrote...

>As for the comment made about breadboards being the worst way to go... keep in
>mind I'm just testing it now, I don't plan on boxing this up and using it with
>a breadboard :-)

It doesn't matter WHY you're using a solderless breadboard now;
the problem is that your circuit is very unlikely to work AT ALL
if you attempt to build it that way.

Regarding this 50 uH inductor you're using: is it the right kind
of inductor, one meant for switching regulator application?  Not
all inductors are the same, you know.  You need one which is
rated to handle the peak current in-circuit without saturating.

One other comment: the 220 uF capacitor in your circuit,
following the rectifier- are you sure it's big enough?  I know
that's the value Maxim shows on their schematic for the MAX787,
but that's not the only thing you should consider.  You need to
use a capacitor large enough that the instantaneous capacitor
voltage will not droop too low in between peaks of the mains AC
input.  The LM350 requires a certain minimum input voltage to
keep its output regulated, and you need to ensure you maintain
that minimum under full load conditions.  My subjective judgement
(i.e., educated guess) is that you need a capacitor at least ten
times as large as the one you're using.

Dave D.

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