Palsonic DVD player

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Hi all,

invested $44 on a Palsonic DVD2040  from DSE this arvo.

Just needed a compact CD player for my workshop  -  as a music signal source
and for my Denon " Audio Technical CD "  with its white and pink noise plus
1/3 octave noise tests signals ( 99 tracks in all).

Though the Palsonic works surprisingly well ( even has a volume function on
the remote)   there is a niggling problem.

The darn thing has a background hum on the L & R audio outputs, the
fundamental frequency of which is very steady at 194 Hz  -  plus some higher
harmonics. This must somehow be related to the audio sampling frequency of
194kHz.

The hum level is about 1.4mV rms or 62dB below max level,  it stops
completely in "pause" mode but the volume function has zero effect on the
level.

Anyone concur ?





.......   Phil





Re: Palsonic DVD player


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This was covered in some detail in Oct 2007 Silicon Chip mag with
tests of several similar consumer  DVD/CD players currently on the
market (though not the "Palsonic" model).

They believed that this was mostly due to the crappy switchmode power
supplies used in the players radiating noise, and they tried making up
a linear PSU to replace the SM one which fixed the hum problem, but
obviously not the poor audio quality.

Ironically, building such a replacement PSU would probably cost almost
as much in parts as the entire player retailed for however.



Re: Palsonic DVD player

"kreed"

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**  Nope -   you are  TOTALLY WRONG   about this.


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** That is also 100%  NOT  true.

The whole SC article was a pile of bollocks.

If  (and that is a very BIG  if  ) you hear residual 50 Hz derived noise
from a DVD player using a SMPS  -  all you need do to  ELIMINATE   IT   is
run the unit from a  240:240  volt isolation transformer.

The cause is the damn Y cap.

Funny how SC never said that.

Something about the  " .... the truth spoil a good story " ??

Please note: the noise in my Palsonic is NOT linked to the mains frequency.

194 Hz ??

Gimme a break .....




........  Phil





Re: Palsonic DVD player


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frequency.

You really are an fwit phil. Someone goes to the trouble to reply to your
question and you insult them. Dickhead.

Michael



Re: Palsonic DVD player


if its the psu like kreed mentioned. put an aluminium foil sheild around
the psu and filter capacitors on the V+ feeds, there should only be 3
voltages in the psu, 3v 5v and 12v. easy to tap these out of an old AT
psu if simple filtering/sheilding doesn't help

Re: Palsonic DVD player



"mat"

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**  194Hzzzzzzzzzzzzzz....





.......  Phil







Re: Palsonic DVD player



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Bought another dud eh Philthy?  Oh well you will soon be on first name basis
with all the people at Consumer affairs at this rate.

TT

PS How long did it take you to save the $44?



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