Palsonic DVD player

P

Phil Allison

Guest
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
 
On Oct 28, 5:17 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:
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
Click to expand...
On Oct 28, 5:17 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:
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
Click to expand...
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.
 
"kreed"

This was covered in some detail in Oct 2007 Silicon Chip mag
Click to expand...

** Nope - you are TOTALLY WRONG about this.


They believed that this was mostly due to the crappy switchmode power
supplies used in the players radiating noise,
Click to expand...

** 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
 
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
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:5oirbrFms6vqU1@mid.individual.net...
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

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

TT

PS How long did it take you to save the $44?
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:5oj9pbFmcpldU1@mid.individual.net...
Please note: the noise in my Palsonic is NOT linked to the mains
frequency.

194 Hz ??

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

Michael
 
"Michael Cunt"



** All that needs to be said, really






......... Phil
 
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