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Old 22nd February 2006, 10:42 AM   #901
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by awpagan
the 22mV noise?
you have problem with 20mHz scope
mine is a 5mHz velleman portable
Hi Allan,

I'm afraid it's not the scope. The noise is coming out of the player....
Brent measured it too the other day.

Ray.
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Old 22nd February 2006, 10:42 AM   #902
awpagan is offline awpagan  Australia
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rowemeister
"""Now what do I do now...... """

give us the details of your present configuration
and we all will do our best to think of something

allan
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Old 22nd February 2006, 10:52 AM   #903
awpagan is offline awpagan  Australia
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Quote:
Originally posted by 6h5c


Hi Allan,

I'm afraid it's not the scope. The noise is coming out of the player....
Brent measured it too the other day.

Ray.

i didn't think it was the scope.

what frequency is it?
is there any harmonics relevent to it also.


allan
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Old 22nd February 2006, 10:55 AM   #904
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Quote:
Originally posted by awpagan
rowemeister
"""Now what do I do now...... """

give us the details of your present configuration
and we all will do our best to think of something

allan

Do you want to know what I have done to my player?
err I have changed almost everything. lol

I am going to compile a full list of mods.

I have 10 regs (mainly Audiocom) so every rail is isolated, all caps and resistors on opamp , dac , servo , rf and hf circuits are 0.1% tol and silver mica. Nearly all my big caps are Black gate.

I have 3x nuvotmen tx as well has the marantz toroidal. All diodes are HexFred.

bypass caps on dac etc. Opamps are a combo of OPA627 and opa132 on browndog pcb.

coax mod

The output caps and HDAM is bypassed with silver wire. muting removed. etc etc
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Old 22nd February 2006, 11:03 AM   #905
awpagan is offline awpagan  Australia
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Quote:
Originally posted by rowemeister



Do you want to know what I have done to my player?
err I have changed almost everything. lol

I am going to compile a full list of mods.

I have 10 regs (mainly Audiocom) so every rail is isolated, all caps and resistors on opamp , dac , servo , rf and hf circuits are 0.1% tol and silver mica. Nearly all my big caps are Black gate.

I have 3x nuvotmen tx as well has the marantz toroidal. All diodes are HexFred.

bypass caps on dac etc. Opamps are a combo of OPA627 and opa132 on browndog pcb.

coax mod





The output caps and HDAM is bypassed with silver wire. muting removed. etc etc


Aaahhhhaaa!!

you have opamps still.

allan
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Old 22nd February 2006, 11:05 AM   #906
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Have you done any mechanical mods? I did mod a friends CD63 with lots of bitumen sheets. Not entirely sure if it helped the sound, but it did make it mechanically quieter. Made a near stock CDP over 5kg - so it could nudge yours into double figures


Cheers,
Phil
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Old 22nd February 2006, 11:38 AM   #907
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by awpagan
i didn't think it was the scope.

what frequency is it?
is there any harmonics relevent to it also.

allan
Oh, sorry...misunderstood your scope-joke
Too serious at work here, I think...

I tried triggering my scope to the various clock signals in the player, but I can't get a clearer picture. It's too wide-band. Probably HF-residue from the DAC's PWM outputs = lot's of harmonics.

I placed an extra 100p capacitor parallel to the 100p in the filter and that reduces it considerably, so I guess we'll need a higher order filter to get rid of it.

Regards,

Ray.
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Old 22nd February 2006, 11:49 AM   #908
awpagan is offline awpagan  Australia
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Quote:
Originally posted by 6h5c


Oh, sorry...misunderstood your scope-joke
Too serious at work here, I think...

I tried triggering my scope to the various clock signals in the player, but I can't get a clearer picture. It's too wide-band. Probably HF-residue from the DAC's PWM outputs = lot's of harmonics.

I placed an extra 100p capacitor parallel to the 100p in the filter and that reduces it considerably, so I guess we'll need a higher order filter to get rid of it.

Regards,

Ray.
I'll see if i can find the info about the 44.1Hz noise.
may be lucky

yes harmonics, which are from data and which are from noise?

might have to put a very accuate filter after and then subtract the
known(filter).

allan

ps work does interfere with interesting stuff
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Old 22nd February 2006, 11:51 AM   #909
awpagan is offline awpagan  Australia
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Quote:
Originally posted by philpoole
Have you done any mechanical mods? I did mod a friends CD63 with lots of bitumen sheets. Not entirely sure if it helped the sound, but it did make it mechanically quieter. Made a near stock CDP over 5kg - so it could nudge yours into double figures


Cheers,
Phil

i havn't done much in the way of mod's yet. just starting

go back thought the thread and look at the pic's of rowemeister's
it looks awesome

and a far few mechanical mods too

allan

ps or wait for the sumory with pic's too
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Old 22nd February 2006, 11:55 AM   #910
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by 6h5c


Oh, sorry...misunderstood your scope-joke
Too serious at work here, I think...

I tried triggering my scope to the various clock signals in the player, but I can't get a clearer picture. It's too wide-band. Probably HF-residue from the DAC's PWM outputs = lot's of harmonics.

I placed an extra 100p capacitor parallel to the 100p in the filter and that reduces it considerably, so I guess we'll need a higher order filter to get rid of it.

Regards,

Ray.

Hi.

What about replacing the LC filter between the 2 op amps with an active filter?/


Andy
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