[sdiy] power woes

[Tom Corbitt]

Just add an inline full wave rectifier circuit in series, and you can
ensure that no matter what they plug in (center positive/center
negative/ac) your circuit still is powered correctly,. You just need
to add headroom to your input to account for the diode loss (plus the
regulator loss) If you want 9VDC out, a 12VDC would probably be rjust
about right on the money

TI and National both make a bazillion regulator chips that take wide
input ranges and are very low noise output. Even better, they have
tools that will take your voltage/current specs and generate a custom
reference design complete (TI often has the option to order the pcb,
chip and parts for your design)


Once you get a good PS design dialed in and proven, you can reuse it
over and over again.

Tom C

On Sat, Mar 6, 2010 at 1:08 PM, dan snazelle <subjectivity at hotmail.com> wrote:
> thanks guys
>
> i am using center neg because most of the pedal people use that and it was recommended that i stick with the standard
>
> BUT now i am not so sure as there are far fewer center neg options
>
>
> the dunlop one is the first semi-cheap one (but not quite as cheap as id hoped) that fits the bill so if i can source who makes it for them, i might be in luck
>
>
> if not, i am going to be doing lots of experiments to make sure the power ends up OK when i ship the products
>
>
>
> its funny as i had always thought transformer power was cleaner than switching supplies but in general, the transformer ones are heavier and hummier
>
> i will keep at it and post back
>
>
> thanks!
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