F5X -- the EUVL Approach - The Build Thread - Page 36 - diyAudio
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Old 14th January 2013, 08:00 PM   #351
EUVL is offline EUVL  Europe
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Test it with 2x 4ohm 100W resistor (one per rail) after the CRC boards, before you test it with the amp.

You can use the scope in ac coupling to check the ripples.
And check the DC voltages at various stages of the PSU.


Patrick



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Old 15th January 2013, 08:49 AM   #352
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In the BOM for the power supply, it was listed per channel:

D8-D11, - 4 Diode, - 20A Ultra Fast, - STMicroelectronics, - STTH2002D, -
497-5276-5-ND

1) I see 16 nos here and I only have 8 from the GB.
2) Why wasn't a board done for these instead of hand wiring them?
3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?

Thanks.
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Old 15th January 2013, 08:59 AM   #353
NicMac is offline NicMac  Italy
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> 1) I see 16 nos here and I only have 8 from the GB.

There was an error in the BOM and ashaw did not notice it. Therefore you are missing 8 diodes. You have only paid for the 8 you have.

> 3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?

See attachment.
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File Type: jpg 4_diodes_bridge_rectifier.jpg (14.0 KB, 396 views)
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Old 15th January 2013, 09:08 AM   #354
heinz1 is offline heinz1  Europe
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Quote:
Originally Posted by pmchoong View Post
3) It's difficult to see which wire goes into which leg of the diodes. Could Nic be kind enough to sketch out a diagram?
There are also some drawings in the .pdf file compiled by Mark Lai called "Xen Audio F5X Amplifier Case Assembly Notes" which was sent to case subscribers.
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Old 15th January 2013, 01:34 PM   #355
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Thanks, guys.
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Old 15th January 2013, 04:00 PM   #356
Horio is offline Horio  United States
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Quote:
Originally Posted by NicMac View Post
Just a few pics before I close it up.
Thanks for the progress photos.

I'm still a bit surprised that a little rectifier board wasn't part of the project, considering all the attention paid to the other details of the amp. In the end its not that important, but it certainly would clean up things a bit under the PS heatsink.
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Old 15th January 2013, 04:44 PM   #357
NicMac is offline NicMac  Italy
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I'm sure that a small PCB will be part of Patrick's final solution for the regulated supply once this is ready.
I actually learned a bit about P2P wiring having to do this and in the end it results very reliable and is invisible being located below the heatsink.
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Old 15th January 2013, 05:09 PM   #358
EUVL is offline EUVL  Europe
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At the time we did this years ago, there was no rectifier board. I used P2P myself.
Also it has been a DIY project, with a lot of your own participation, and not a finished commercial product from me.

Anyway, there is one (PCB) now.
If you want to get organised, WK will get them made and send to the distributors, as before.
You can do direct paypal this time for the small sum.
But don't ask him to send to 30 addresses.
He has already way too much work ....

OK ?


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Old 15th January 2013, 05:58 PM   #359
EUVL is offline EUVL  Europe
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So we checked PCB prices.

70m copper, double sided, blue mask, white silk screen.
4 pieces per amplifier, 80 HKD (~10 USD) all inclusive (Paypal, registered post, etc.)

Please post at one of the GB threads, and leave this for technical things.


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Old 16th January 2013, 02:28 AM   #360
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Thanks Patrick. By no means was I being critical at all. I was just stating my surprise considering the amazing amount of attention to detail you have put into the project as a whole.

For those who are interested, I started Rectifier Board GB interest thread here.
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