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F5X -- the EUVL Approach - The Build Thread
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Old 2nd October 2016, 08:48 PM   #1001
samoloko is offline samoloko  Bulgaria
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Quote:
Originally Posted by alazira View Post
Can anyone tell me the spacing for the diodes on the heatsink?

After discovering the quasimodo thread I am looking to snub the transformers as well as replacing the diodes. Pre-building the bridges (PTP) would reduce the time the amp is out of commission. Anyone snub the primrose tx with the quasimodo?
which diodes you plan to use - FFPF30, HexFreds or else
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Old 4th October 2016, 09:12 PM   #1002
alazira is offline alazira  United States
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Quote:
Originally Posted by samoloko View Post
which diodes you plan to use - FFPF30, HexFreds or else
This one: STTH15S12
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File Type: pdf diode STMicro STTH15S12.pdf (256.6 KB, 35 views)
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Old 5th October 2016, 02:31 PM   #1003
samoloko is offline samoloko  Bulgaria
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thank you for reply
please tell us Impression after change

one thing that I remember from Mark posts Is that super fast switching diodes not always guarantee better sound
did you notice relatively high voltage drop - 1.9 V

Last edited by samoloko; 5th October 2016 at 02:34 PM.
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Old 5th October 2016, 09:34 PM   #1004
Markus is offline Markus  Germany
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Default Transformer Integration

When I was searching in this thread for a nice solution on how to integrate the power transformers and how to solve the transformer connectivity mess I saw that I was not the only one who was on the search for proper solution.

For those how might be interested this the solution I ended up with.

Since I know this question will come:
I have 12 V and 3 V secondary coils such that I can combine them to 9, 12 and 15V. The shown configuration privides 15V each.

Markus
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Old 5th October 2016, 10:05 PM   #1005
pchw is offline pchw  United States
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One important point to add, the number of amps drawn is limited by the lesser of the 2 windings.
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Old 6th October 2016, 06:55 AM   #1006
EUVL is offline EUVL  Europe
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Nice solution Markus.




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Old 6th October 2016, 03:01 PM   #1007
pmchoong is offline pmchoong  Malaysia
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Hi Markus, what are those white pieces of flat plates on the transformers?
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Old 6th October 2016, 07:50 PM   #1008
Markus is offline Markus  Germany
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Default Transformer Integration

Hi Pmchoong,

the white pieces are flanges made from plastics, more precisely from POM (PolyOxyMethylen). The flanges are sitting on the potting material the center holes of the toroids are filled up with. On the bottom side the transformers are sitting on support rings that are also interfacing to the potting material. The coil itself is free from any mechanical contact and related mouning stress, only the potting material experieces the monting stress.
I attached the sketches of both parts.


Cheers
Markus
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File Type: pdf TransformerSupport5.pdf (23.5 KB, 43 views)
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Old 6th October 2016, 08:01 PM   #1009
EUVL is offline EUVL  Europe
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Perhaps you should also educate us why it is important to have the coil winding stress free.




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Old 6th October 2016, 08:09 PM   #1010
alazira is offline alazira  United States
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Quote:
Originally Posted by samoloko View Post
thank you for reply
please tell us Impression after change

one thing that I remember from Mark posts Is that super fast switching diodes not always guarantee better sound
did you notice relatively high voltage drop - 1.9 V
Yeah, I noticed the large Vf, so I may need to adjust the zener ref. Thankfully I used sockets for those so no big deal to change them. It also has a Softness=2, although with the snubbing not as much of a factor. More importantly, in listening tests (DAC power supply) I preferred it over previous favorites.

I will report the snubber values I find with the quasimodo here, although I'm not sure when that will be (sometimes these projects sit around for months before I get to them).
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