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Old 20th June 2008, 09:46 PM   #10201
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by SimontY
No, here it is:
Says Simon The Padlifter...
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Old 21st June 2008, 11:28 AM   #10202
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Quote:
Originally posted by ian21
I'm using bg's 220 uf at c611...614 so assume this is ok.?
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Old 21st June 2008, 11:31 AM   #10203
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Quote:
Originally posted by 6h5c
Says Simon The Padlifter...
Ahh, I knew there'd be come-back

Mine's been working for ages now! I.e. not modded for ages... but I still have a psu upgrade for my clocks to do and an Audiocom Super reg to fit on the DAC digital. I just don't want to break it!

Simon
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Old 21st June 2008, 11:56 AM   #10204
6h5c is offline 6h5c  Netherlands
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I see there's a bit of a dilemma there .

Shall I touch it..... or not?
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Old 21st June 2008, 02:59 PM   #10205
RCruz is offline RCruz  Switzerland
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Default C1 Clock report

Gentlemen

As agrred, here my report after implementing the C1 clock on the dac:

Improved dynamics with noticeable silences.
Much better stereo image.
Stage depth and stability improvements.
Instrument placement better defined.
Instrument size "volume" recreating an holographic auditive picture.
Recording place echoes and reverbs well recreated (Laurie Anderson "Bright Red")
Much better instrument diferentiation and positioning in the soundstage.
Particular improvements in attack and decay.
Voice timbre and placement extraordinary improvements (Tori Amos)
Piano notes and reverb recreated with aplomb.

This mod completely transformed the player.

Now I believe that PDM signal must have a good clock to result.

Ricardo
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Old 21st June 2008, 03:02 PM   #10206
RCruz is offline RCruz  Switzerland
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Default Heating sregs

Not everything is perfect.... the +-12v sregs are fed by a 2x18v TX and 4xhexfreds and 2x10.000uF.

The sregs get too hot to touch ..... is this normal ?
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Old 21st June 2008, 05:10 PM   #10207
6h5c is offline 6h5c  Netherlands
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Hi Ricardo,

That's great news. The clock is the 'heartbeat' of the player, so as you can hear a good stable clock has a lot of influence.

The regulators are getting hot because your input voltage is too high. An 18V tranny is too much if you want to make a regulated 12VDC. And, on top of that, you are using big 10.000uF caps that will boost the voltage even more.

How much VA is that tranny? If it is very big compared to the actual power it has to deliver, the 18V output voltage will be even higher, because the load is very small. The regulation of a 18VA tranny could be 20% typical, so that 18V~ will be more like 22V~ at small loads. I think if you measure the regulators' input voltage, you will see over 30V there.

Regards,

Ray
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Old 21st June 2008, 05:59 PM   #10208
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by 6h5c
Hi Ricardo,

That's great news. The clock is the 'heartbeat' of the player, so as you can hear a good stable clock has a lot of influence.

The regulators are getting hot because your input voltage is too high. An 18V tranny is too much if you want to make a regulated 12VDC. And, on top of that, you are using big 10.000uF caps that will boost the voltage even more.

How much VA is that tranny? If it is very big compared to the actual power it has to deliver, the 18V output voltage will be even higher, because the load is very small. The regulation of a 18VA tranny could be 20% typical, so that 18V~ will be more like 22V~ at small loads. I think if you measure the regulators' input voltage, you will see over 30V there.

29v

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Old 21st June 2008, 06:21 PM   #10209
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Old 21st June 2008, 10:55 PM   #10210
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by SimontY


Ahh, I knew there'd be come-back

Mine's been working for ages now! I.e. not modded for ages... but I still have a psu upgrade for my clocks to do and an Audiocom Super reg to fit on the DAC digital. I just don't want to break it!
I seem to have the same problem here...

Everytime I need to do a new mod, I must concentrate myself for some time so I do not panic while working in the pcb.... it is very easy to damage.

Now... should I consider heatsinks in the +-12v sregs ?

Any other alternative ?

I specifically built the opamps dedicated psu with a 2x18v TX following other´s ideas on this forum... I intend to use the same psu for the future discrete outputs...

Ricardo
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