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Old 2nd April 2013, 12:54 PM   #491
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Thanks Georg, that just about cover everything including the B32522 10oF caps - I use the 1uF version of these (1uF/63v B32529) as bipass caps a lot - I think Elfa has the 10uF ones - not so sure about the Fukashimas, but can get the equivalents okay.

A query about the raw supply filter caps - you mention a 40,000uF per rail/ch - can this be a C-R-C of 10,000 - 0.1R - 20,000uF.

Also, from the above ...
load capacitance of at least +- 44.000 per channel before the regulator boards and the same buffer capacitances at the regulators' outputs.

Does this mean another 40,000uF on the output of the Rag, on the amp's supply lines (after the regulator) too?
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Old 2nd April 2013, 01:24 PM   #492
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Originally Posted by jameshillj View Post
Thanks Georg, that just about cover everything including the B32522 10oF caps - I use the 1uF version of these (1uF/63v B32529) as bipass caps a lot - I think Elfa has the 10uF ones - not so sure about the Fukashimas, but can get the equivalents okay.

A query about the raw supply filter caps - you mention a 40,000uF per rail/ch - can this be a C-R-C of 10,000 - 0.1R - 20,000uF.

Also, from the above ...
load capacitance of at least +- 44.000 per channel before the regulator boards and the same buffer capacitances at the regulators' outputs.

Does this mean another 40,000uF on the output of the Rag, on the amp's supply lines (after the regulator) too?

Yes. See the picture of my supply boards (two channels shown). I use BCcomponents 47,000/40V (051 57473). There are also available 22.000 (051 57223) and 33,000 (051 57333) with equal 40mm diameter.

The first section is CRC, the second the buffer capacitance after the regulators. The bypass caps are Roederstein or Wima or Siemens 2.2 MKC or MKP (22.5mm spacing).

Last edited by permaneder; 2nd April 2013 at 01:35 PM.
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Old 2nd April 2013, 01:33 PM   #493
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Here's the picture now
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Old 2nd April 2013, 01:57 PM   #494
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Ah, I see - C-R-C and the post reg C with the common central 0 Volt point - thanks, very clear, as usual.

Do the footprints suit the F&T snap-in caps?

Hey, this makes up to be a pretty serious power supply!
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Old 2nd April 2013, 02:11 PM   #495
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Instead of the 4 resistors in the R of the CRC, you could insert a small inductor. Thus a CLC where the L is a combination of coil inductance and wire resistance.

20mm mandrill, 10mm between the cheeks. 100 turns of 1mm wire, giving a coil 40mm diameter by 10mm thick.
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Old 2nd April 2013, 02:20 PM   #496
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Quote:
Originally Posted by jameshillj View Post
Do the footprints suit the F&T snap-in caps?
Diameter? Spacing (10mm)?
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Old 2nd April 2013, 03:50 PM   #497
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Ah, sorry Georg - I now had a good look at the pcb and see the flexibility of the cap sizes designed into it - foot in mouth troubles!

Present design is BYV diodes into 2 x 4,700uF Nichicon GT - 0.1R/3W Dale SMD - 12,000uF Elna for Audio -> Basic Fet Cmultiplier -> 6,800uF Nichicon SuperThru -> amp (1uF Epcos bipass caps) for 8 Ohm load.

Nothing like the cap sized you have designed - have to look into this.

Mixed results with Choke filters for me, Andrew - I can't seem to get the Duncan design to work right for me with the C-L-C setup, even with #14 wire and flat Theile profile.
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Old 2nd April 2013, 06:53 PM   #498
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Hi Georg,
The PCBs look great !
And long... perfect for my 40cm long heatsinks

You used a 4x CRC PS, like a dual mono configuration.
I'll keep mine a little simpler, a common PS for both channels but separate regulators:
one 500VA, two bridges(+and-), two CLC and then the four regulators.
Almost the same PS as in my regular F5 but with the extra regulators.

One question: what's the heat dissipation of the regulators ?
So I can calculate if I need additional heatsinks or I can put them on the same heatsink as the toshiba mosfets.

Regards,
Danny
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Old 3rd April 2013, 05:28 AM   #499
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Quote:
Originally Posted by danny_66 View Post
Hi Georg,
The PCBs look great !
And long... perfect for my 40cm long heatsinks

You used a 4x CRC PS, like a dual mono configuration.
I'll keep mine a little simpler, a common PS for both channels but separate regulators:
one 500VA, two bridges(+and-), two CLC and then the four regulators.
Almost the same PS as in my regular F5 but with the extra regulators.

One question: what's the heat dissipation of the regulators ?
So I can calculate if I need additional heatsinks or I can put them on the same heatsink as the toshiba mosfets.

Regards,
Danny

Hi Danny,

Given a transformer with 2*22V secondaries, the regulator MOSFETs will dissapate ~ 20W each per rail and channel ((22V*square root 2 - 20V Vout)*2A). That is a minimum total of 80W for a Stereo amp.

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Georg
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Old 3rd April 2013, 07:26 PM   #500
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Quote:
That is a minimum total of 80W for a Stereo amp.
Thanks, I think I'll attach the regulators to the alu frontplate, it's 10mm thick and 45x18cm large.
If that's not enough I can always add some cooling fins on the frontplate (inside the case).
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