[sdiy] Power Supply ???

[Joe Kramer]

Tim,
    Actually the current draw will be low for all six modules--probably
totalling 100ma.  The 18v and 9v rails supply the modules.  The 5v rails
will be there only for front panel "biasing" outputs, so the draw will
be almost nothing on them.  I was also planning on bolting all
regulators to a big hunk of aluminum.

Joe

Tim Ressel wrote:

> Joe,
>
> It depends. Apply Ohm's law: 20V-5V=15V. at 100mA of
> current, 15V * 0.1A=1.5W. At 1A of current,
> 15V*1A=15W. I don't know what your current
> requirements are, but those regs might get hot. At
> least make sure you heat sink them.
>
> --Tim
>
> --- Joe Kramer <musetrap at earthlink.net> wrote:
> > Dear Tim,
> >     All the regulators are supposed to be able to
> > handle 40v max at the
> > input, but I was thinking of using something around
> > 20v from the
> > transformer for the whole thing.  Is that what you
> > mean?  Would this
> > still be an issue?
> >
> > Regards,
> > Joe
> >
> > Tim Ressel wrote:
> >
> > > Joe,
> > >
> > > The issue I see here is the amount of power the 5V
> > > regs will be dissipating. This has to do with the
> > > amount of voltage drop they will be providing.
> > Perhaps
> > > a second transformer for the +/-5V side?
> > >
> > > --tim
> > >
> > > --- Joe Kramer <musetrap at earthlink.net> wrote:
> > > > Dear Friends,
> > > >     I'm building a supply for six Paia 4700
> > modules.
> > > >  I need +18v, +/-9v, and
> > > > +/-5v.  I have all the necessary three-terminal
> > > > regulators, but my question is
> > > > this: given a hefty enough transformer, can I
> > just
> > > > hang the regulators in
> > > > parallel off  the full wave bridge and filter
> > caps,
> > > > or will this put to much
> > > > strain on them?  I'm sure all six modules will
> > come
> > > > in way under an amp of
> > > > current consumption.  Any design advice
> > appreciated.
> > > >
> > > > Regards,
> > > > Joe Kramer
> > > >
> > > >
> > >
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