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Old 3rd January 2013, 09:05 AM   #751
FdW is offline FdW  Netherlands
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Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by brozatus View Post
I can touch them only for seconds.
If you can touch it, then it will be about 80degC, that is acceptable (although a bit high). You can lower the input voltage of the PSU by adding a bit of series resistance to the rectified transformer output, the voltage to the PSU will drop by 1,5V for each 10ohm. In your case you could drop 3V and you should thus use 20ohms (2 * 1.5V = 3Watt will be dissipated by the resistor).

According to Mpp#6462 you could even drop 4.5V = 30Ohm = 4.5Watt

Be sure that air circulates freely around the heatsink.

These are the most important/relevant messages regarding PSU and Pre-Reg.
  1. Mpp #4375 PSU-pre-regulator.
  2. Mpp #4610 V2 Schemas UPS and Amp.
  3. Mpp #6506 CCS fine-tuning.
  4. Mpp #6462 PSU with my notes.
  5. Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
  6. Mpp #7127 More about transformer selection.
  7. Mpp #7635 Single and dual transformer wiring (also corrected drawing).
  8. Mpp #7733 Grounding (PSU, RIAA and Player).
  9. Mpp #7810 35V PSU for the CroMagnon.
  10. Mpp #7830 The PSU explained.
  11. PradiseBuilders #155 Vdc input voltage minimum simulated.
Have a look at these and their following messages.

Last edited by FdW; 3rd January 2013 at 09:23 AM.
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Old 3rd January 2013, 09:39 AM   #752
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That's perfect!

Thanks a lot, for all the links also.

Best regards,
Christoph
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Old 3rd January 2013, 10:31 AM   #753
ste is offline ste  United Kingdom
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Many thanks for the links.
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Old 3rd January 2013, 11:00 AM   #754
carolus is offline carolus  Belgium
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@ FdW,
thanks for the links (& your hints) ... I can see "the trees in the wood" ...
Allez, salukes.
Karel
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Old 3rd January 2013, 11:13 AM   #755
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And here is the board lay out for the pre regulator post 4375 as I am currently using with My Paradise R2 I have added further RC stage which can be used to connect cokes
Attached Files
File Type: pdf Preregulator last version030113.PDF (104.2 KB, 87 views)
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Old 3rd January 2013, 11:58 AM   #756
FdW is offline FdW  Netherlands
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And if you have some spare time, go-to Google.com (yes that one ). In the search-bar type the name of your favorite component (BD140? or (as I did here) LME49710). Then select 'Images' and be amazed . Looking at these images you see odd items (or just interesting ones), select one and have a look.

BTW this is what I found in the LME49710 search results opamp??
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Old 3rd January 2013, 04:13 PM   #757
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Quote:
Originally Posted by Joachim Gerhard View Post
From JP2a to JP2b. Simply from output to ground.
I did it , but it changes nothing on fluctuation .
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greatings , Dirk
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Old 3rd January 2013, 04:28 PM   #758
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Substitute R15 with a 500 Ohm multiturn trimmer and trim the offset.
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Old 3rd January 2013, 07:18 PM   #759
Take5 is offline Take5  Germany
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Hello,
today i start up my Paradise. First i started with one supply for both boards, all measurements were fine and so i connect my Denon 103 after set up DC Offset with a dummy.

Big Noise was the first result. Searching the source i found out that both channels playing fine for itself, without pluging the other Channel, it must be a problem with ground.

Second start with two supplies and seperate grounds, lipo batteries from my rc helicopter, and the paradise works fine. So its no question for me to bulid up to supplies.

I was suprised about the sound at the first beginning, fast, open and clear, the perfect match for my DIY setup > Audio » Hörraum

Great job guys! Special thanks to Gerhad for this mad design, i saw and heard one of the first hedgehog at frickelfest 2010

Best regards
Chris

Click the image to open in full size.
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Old 3rd January 2013, 07:40 PM   #760
FdW is offline FdW  Netherlands
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Congratulations, good to see that you succeeded Nice 'Hörraum'.
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