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Old 1st November 2010, 10:20 PM   #1091
bsl is offline bsl  Hungary
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hi alex!
would you be so kind as to post the last versions of the pcb-s? ( comlete docs - as you did it in the past )
thank you
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Old 1st November 2010, 10:37 PM   #1092
Liliya is offline Liliya  Norway
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Location: 3370 Vikersund
Default Transformer and source resistors.

Ivodonchev, thank you.

Dropping 32/33 down to a lower value: A straightforward solution for me (and others).

But we are still talking of 50VAC to this point and not DC?


Alex, thanks to you too for listening about the source resistor. Your proposal to this on the underside of PCB will be easy to adapt for those who want/need it.

Eivind Stillingen
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Old 1st November 2010, 10:50 PM   #1093
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I am talking about 50VAC not DC too. Please look at the simulation
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Old 1st November 2010, 10:54 PM   #1094
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This is another valid solution
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Old 1st November 2010, 10:59 PM   #1095
Liliya is offline Liliya  Norway
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Default 2x50 VAC transformer for Goldmund.

Ivodonchev

According to the simultation you have done, a 80VDC capasitor for C31/C34 will be "safe" enough? 100 VDC not needed??

Eivind Stillingen
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Old 1st November 2010, 11:15 PM   #1096
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for 50vac transformer 80v capacitors is fine with sure
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Old 1st November 2010, 11:30 PM   #1097
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Here is simulation with 60VAC transformer, as you can see there are not difference in the power between two simulations. I think that the reason why Goldmund push mosfet's to the limit are primary sonic performance.

Best regards
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File Type: jpg Goldmund_60AC.jpg (292.8 KB, 1056 views)
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Old 2nd November 2010, 05:06 AM   #1098
jam is offline jam  United States
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Default We don't need no real engineers!

...............maybe we need to rename this thread, The Burning/Smoking Amp Thread.......

Last edited by jam; 2nd November 2010 at 05:09 AM.
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Old 2nd November 2010, 09:00 AM   #1099
dadod is offline dadod  Croatia
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Hi Alex,
Last PCB has an error as drain is pin no2 and sourse is connected to the MOFET case.
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Old 2nd November 2010, 10:30 AM   #1100
Luke is offline Luke  New Zealand
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so then shouldnt the board have a place for source resistors?
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