Power supply for Toslink -> coax converter
Public Image Ltd
Long time, no talk. I have a question: Jaycar are trying to sell me a
switching power supply (6V, 800 mA) for said converter. Any potential
problems there? My instincts say no, because a conversion from one
digital format to another is hardly demanding stuff. But I suppose
there could be gotchas regarding operational frequencies,
interference, and the like. The converter input will be an LCD TV,
output to a DAC (non-switching 9V/1-3 A power supply).
Opinions please. Knowledge and experience would be even better. :-)
Arny Krueger
news:312da72b-2fcd-4df0...@z4g2000prh.googlegroups.com
Tiny switching supplies seem to replacing traditional analog power supplies,
even at the lowest power levels. If they meet FCC Part 15 rules they can't
be too noisy.
On a Toslink->Coax converter the largest potential source of EMI would be
the Coax output. Unless it is properly fiiltered, it will produce harmonics
up into the microwave band.
Soundhaspriority
"Public Image Ltd" <muck...@yahoo.com.au> wrote in message
news:312da72b-2fcd-4df0...@z4g2000prh.googlegroups.com...
Opinion: No problemo :) This is based on the following observation. My
converter, having been purchased some years ago, is equipped with a generic
wart. These warts are no paragons of virtue.
Let us know if you make a disappointing discovery ;)
Bob Morein
(310) 237-6511
Phil Allison
"Public Image Ltd"
>
> Long time, no talk.
** It's like a ghost town here ......
> I have a question: Jaycar are trying to sell me a
> switching power supply (6V, 800 mA) for said converter. Any potential
> problems there?
** Well - it is from Jaycar so you never quite know what you are getting.
> My instincts say no, because a conversion from one
> digital format to another is hardly demanding stuff.
** The device converts from optical to electrical - the signal format stays
the same actually.
> But I suppose
> there could be gotchas regarding operational frequencies,
> interference, and the like.
** That is what a *digital* link is supposedly all about eliminating.
In any case, you will find it hard to find a similar, new supply that is not
using switching circuitry - cos they were outlawed in Australia earlier
this year under the Green Loonie controlled MEPS insane rules.
One issue is possible - most SMPS plug packs have a rather high residual AC
voltage on the output lead that can be a hazard for sensitive input circuits
of some equipment at the MOMENT of being connected. This is particularly
true of RCA plugs that invariably connect the signal pin first.
Best idea is to make the SMPS the very LAST thing you plug in and power up.
..... Phil