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Old 24th December 2011, 03:20 PM   #841
Franz Gysi is offline Franz Gysi  Switzerland
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Step 1, used another tranny (18-0-18):

I have now 49.5VDC on C105

But cannot get more than 39.5VDC output

I change R103 to a 10k type, right?

Franz
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Old 24th December 2011, 03:23 PM   #842
Salas is online now Salas  Greece
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Its the Vref then, no doubt. With now Q103 IDSS you chanced on, is a bit short of steam. If you will up the R103 value it will increase. What voltage drop you got over R103 and what is its now value?
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Old 24th December 2011, 03:25 PM   #843
Franz Gysi is offline Franz Gysi  Switzerland
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Voltage drop is 20.2VDC over 6k8 (R103)
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Old 24th December 2011, 03:32 PM   #844
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2.97mA. Means it sits at the left of midpoint 4mA that the examples are given for. Make R103 10K. Should suffice. Will give ~9V more range.
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Old 24th December 2011, 03:39 PM   #845
Franz Gysi is offline Franz Gysi  Switzerland
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Perfect, thanks

Can adjust now the desired 45V.

More soon

Franz
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Old 24th December 2011, 03:47 PM   #846
Salas is online now Salas  Greece
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Old 24th December 2011, 04:11 PM   #847
Franz Gysi is offline Franz Gysi  Switzerland
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uuups, the hot button...

Last edited by Franz Gysi; 24th December 2011 at 04:21 PM.
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Old 24th December 2011, 04:18 PM   #848
Salas is online now Salas  Greece
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Old 24th December 2011, 04:21 PM   #849
Franz Gysi is offline Franz Gysi  Switzerland
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First quick and dirty test (dont do the same, it is a dangerous arrangement):

Click the image to open in full size.

No remote sensing yet.

Recently, I purchased the latest Tom Waits album on vinyl (Bad As Me). And it contained also the CD.

Now, I am switching for and back between vinyl and my squeezebox, as I did it some weeks ago, using a LM317 psu for the phono pre.

You may ask yourself: is Tom Waits a good choice to compare?

Yes, it is. It contains very clean and sublte details.

First minutes, I was thinking: not a big difference to the LM317 psu.

But, now listening on the second side and switching for and back:

This is it. A big step towards real analog audio for me.

The vinyl reproduction is beating the digital reproduction in some sublte details now.

I simply like it.

Thanks for all Salas!

I wish a merry christmas to all readers
Franz
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Old 24th December 2011, 04:23 PM   #850
Salas is online now Salas  Greece
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Merry Xmas!

Remote is better still (especially for your cable distance).
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