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Old 28th April 2012, 11:46 PM   #1341
nrg2009 is offline nrg2009  United States
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Toecutter, it is great to see this progress. Keep up the great work, the results are better with each revision. Well done and thanks for your work.
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Old 29th April 2012, 12:16 AM   #1342
imix500 is offline imix500  United States
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I should be able to load the psu and check diode temps Mon or Tues.

I did have to change the Phoenix connectors to allow for larger wire but I see you have revised that.
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Old 29th April 2012, 04:50 AM   #1343
Variac is offline Variac  United States
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Quote:
Originally Posted by nrg2009 View Post
Toecutter, it is great to see this progress. Keep up the great work, the results are better with each revision. Well done and thanks for your work.

With the connections on both ends of the output boards, you can put an N or P board on either side and still have a short connection to the power supply. Also in a monster Monoblock you could have 2 N type or 2 P type boards daisy chained together on each side.

And the new input board with a pair of input circuits makes a 2ch amp easy, as well as a balanced monoblock.
Or snap it in two for a regular monoblock.

Last edited by Variac; 29th April 2012 at 04:52 AM.
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Old 29th April 2012, 11:07 PM   #1344
imix500 is offline imix500  United States
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Ok, had some extra time today so I got some temp readings on the PSU board.

With a 5A load at 32.6v the rectifier heatsink settled at 134F @74.5F Ambient
With a 8A load at 31.4v the rectifier heatsink settled at 180F @75.5F Ambient

The cap closest to the heatsink and .47 resistors was at 107F

The PSU is mounted in the enclosure, so there was little air movement. I have tunnel heatsinks with very quiet fans that will be sharing the space, so I'm sure the air movement will make a difference.
I am however wondering if it might be worthwhile looking into larger sinks for the rectifiers.

This was with only one side loaded as I only have one dynamic load. The next step will be using some large resistors to load down both sides.
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Old 29th April 2012, 11:38 PM   #1345
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Might i make two suggestions. Put the diodes at the back of the PSU board like the DCB1 which will allow for easy mounting to a separate small heat sink. If this causes connection problems, put two diodes to each side and the sinks can flank the psu board.
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Old 30th April 2012, 01:36 AM   #1346
koja is offline koja  Canada
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Default WHAT? - new F5T pcbs?

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Originally Posted by koja View Post
i already let Andy know but for the record:
For me please:

2 input stage boards (70x70mm)
8 single fet output boards (35x50mm),
and please try to make the dimensions stick. no more changes pls Thx.
---------------
Now, if you guys would get past sharing your heatsink designs (everybody's different, Ok, so no details pls..):

Is there some interest maybe in discussing getting matched fets? at least P-to-P and N-to-N matched and then P-to-N side will be left to the trimmer?
Did I just waste two months waiting for these pcbs?

The dimensions already changed three times back in Feb., we finally settled for something, you had prototypes made, and NOW (!) you want to go "universal". Universal is what Peter. D. does, makes them miniature and there is a big GB within a month with ton of people who know they can run thick wires and place the output fets in ANY location taht suits their design.

I have small fan-cooled sinks and after your last change I played for hours figuring out how to fit everything based on your 70x70mm (input) and 35x50 (single output) dims. Can I still count on those or should I pursue a different venue? Where are all those people who were attending this thread back in Feb.?
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Old 30th April 2012, 03:06 AM   #1347
a.wayne is offline a.wayne  United States
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Yeah it's a bit confusing at the moment , Too much smoke I guess , could be worst , yes , very much so ...

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Old 30th April 2012, 08:53 AM   #1348
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by imix500 View Post
.......................................I got some temp readings on the PSU board.

With a 5A load at 32.6v the rectifier heatsink settled at 134F @74.5F Ambient
...............................................
I am however wondering if it might be worthwhile looking into larger sinks for the rectifiers..............................
What speaker demands a continuous 5Adc from the amplifier?
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Old 30th April 2012, 09:21 AM   #1349
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V3 could have 8A of draw at all times, even using dual mono supplies, correct? The dodes can operate at mich higher temps. The numbers imix had translate to about 85C, which is well within their ability to continue their work, even at high current levels. V3 will almost certainly require dual mono supplies. As for layout, i must say that i prefer TeaBags version to the current one. Just opinion, though.
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Old 30th April 2012, 09:31 AM   #1350
AndrewT is offline AndrewT  Scotland
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So, Imix really means PSU rectifiers, not the rectifiers parallel to the source resistors?

If Imix is running each half of the F5T @ 4A of bias for a total monoblock bias of 8A then I consider Imix only option is to run true monobloc. Any attempt to pull 16A of stereo bias would overwhelm even the biggest of chassis dissipation abilities.

Sorry for my earlier intrusion. I just did not believe the PSU reference.
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