Palsonic DVD player

[Phil Allison]

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

 

[kreed]

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

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

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.

 

[Phil Allison]

"kreed"

This was covered in some detail in Oct 2007 Silicon Chip mag

** 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,

** 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

 

[mat]

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]

"mat"

if its the psu like kreed mentioned.

** 194Hzzzzzzzzzzzzzz....





........ Phil

 

[Michael C]

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

194 Hz ??

Gimme a break .....

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

Michael

 

[Phil Allison]

"Michael ****"



** All that needs to be said, really






......... Phil