--- In Jason Stahls <> wrote:
>
> Jim Jackson wrote:
> >>> Maybe a simple voltage conversion circuit can help? The LM7805 is a
> >>> handy little device, even if it's not the most efficient possible
> >>> solution, it's easy enough to use.
> >>>
> >> Inefficient alright - from 12v to 5v it would waste over 50% power, not to
> >> mention heating the regulator. My project is a small solar powered boat
> >> which will need to operate 24 hours a day. Low power consumption was
> >> the primary reason I got this particular board.
> >>
> > For powering my TS7200 from a "12V" Lead Acid battery, I purchased a little
> > switchmode PSU module that substitutes for a 7805, and has a wide input
> > voltage range. The part is PT5101 from Powertrends. I bought mine from
> > Farnell here in the UK. It will supply upto 1 amp and they claim efficiency
> > of over 90% at an input voltage of 16v
> I'll second the Powertrends modules, I've used the +5v, +12 and -12
> modules in the past in industrial environments and we had next to no
> problems with them. Definitely higher MTBF then a 78xx regulator. I
> think Powertrends might have been bought out by someone else, not sure
> who tho I think maybe TI.
>
> --
> Jason Stahls
>
I've made a simple stepdown regulator for a 7250 based on the LM2596 . These
are fairly complete and easy to use. They just need a couple of capacitors and
an inductance externally.
I pulled a toroidal cored inductor off an old PC main board. I also found these
regulators are quite common on flat screen TV controller cards. I build the
ptototype circuit almost entirely from recovered parts.
http://search.datasheetcatalog.net/key/LM2596
similarly efficiency should be around 80-90% depending on load.
This is perfect for the TS board but I'm seeing some very low level pick up on
our analogue board , around one or two LSB , that I believe to be RF pick up
from the regulator switching. This is within design requirements.
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