In: , "Unrevealed Source" wrote:
In general, is it better to run a receiver off a good external DC power
supply, or using AC power and the built-in transformer? It would seem to me
that I might get less noise using an external DC power supply, but what is
the general concensus here? Thanks.

I find batteries to be the best results. 'Course, that is not very practical.

I use a cheap wal-wart, but I cut the wires and put a capacitor in the circuit, that
seems to help a little. (Had at one time a HUGE capacitor, but it was too much
trouble to carry around)

I suppose it all depends on how the respective power supply is built and how
OLD it is. Electrolytic capacitors dry out over time, (especially older tin-can
ones) which I believe explains the "hum" often heard in antique radios. As
equipment ages, I believe an external supply could help in this area.

Jamie
--
http://www.geniegate.com Custom web programming
(rot13) User Management Solutions

The Best DC supply is a car or motorcycle battery. It is completely
noise-free, has enough power to eliminate audio clipping, and can
supply many hours of listening.
The drawbacks are the need to be recharged and the need to keep it
well clear of electronic equipment because of corrosion caused by ions.
Of course, you cannot use it with the charger when listening as most
battery chargers are quite noisy, but I have used a motorcycle battery
with a 2 amp charger that was not too bad (Schumaker Mity Mite).
To repeat, do not keep a lead-acid battery near (within 10 feet) of
any electronic equipment: it will eat hell out of the boards. But it
will give you the best DC supply and it need not cost too much, either.

wrote:

The drawbacks are the need to be recharged and the need to keep it
well clear of electronic equipment because of corrosion caused by
ions.

Is this correct? I'd expect this sort of corrosion to be pretty
minimal, even with little separation.

Steve

wrote:

wrote:

The drawbacks are the need to be recharged and the need to keep it
well clear of electronic equipment because of corrosion caused by

ions.

Is this correct? I'd expect this sort of corrosion to be pretty
minimal, even with little separation.

Steve


I think he is referring to H2SO4 (Sulfuric Acid) fumes given off when it
is being charged. If you don't think Sulfuric Acid is BAD NEWS for lots
of things just do a search for "Sulfuric Acid" and see. Here's a MSDS
sheet on it, but it basically deals with SAFETY. Material Safety Data
Sheet = MSDS.

Now, if you get into FUMING SULFURIC ACID (also known as concentrated)
you're talking a whole different ball league -- not just a game!

Sorry. Forgot to include the URL for the Sulfuric Acid MSDS

http://avogadro.chem.iastate.edu/MSDS/H2SO4.htm

==========

Al Patrick wrote:



wrote:

wrote:

The drawbacks are the need to be recharged and the need to keep it
well clear of electronic equipment because of corrosion caused by


ions.

Is this correct? I'd expect this sort of corrosion to be pretty
minimal, even with little separation.

Steve


I think he is referring to H2SO4 (Sulfuric Acid) fumes given off when it
is being charged. If you don't think Sulfuric Acid is BAD NEWS for lots
of things just do a search for "Sulfuric Acid" and see. Here's a MSDS
sheet on it, but it basically deals with SAFETY. Material Safety Data
Sheet = MSDS.

Now, if you get into FUMING SULFURIC ACID (also known as concentrated)
you're talking a whole different ball league -- not just a game!

Gotcha, but I don't see why anyone would choose to power their receiver
off such a battery. There are plenty of sealed lead-acid and gel cell
batteries on the market that are safe for indoor use and that produce
negligible emissions.

Steve