F5 Turbo Circuit Boards

[T Leung]

Thanks AudioSan. I go for 2X30VAC. tranny

 

[AudioSan]

then you better cascode the j-fets

 

[T Leung]

Yes. somehow, I have problems to locate 500W+ transformer(s) locally. So I figured out to use dual (400W) PS if I need the F5 turbo v3 for my home.

 

[T Leung]

If I go for F5Tv2 of +-32VDC RAIL , are 15,000uf /63VDC PS Cap enough or must I go for 30,000uf each ?

 

[Zen Mod]

how many of them , per channel ?

 

[T Leung]

From the PS in http://www.passdiy.com/pdf/zen-v5-hires.pdf
6 caps C4 -C9 @ 15,000uf or 30,000 for Turbo v2 for 1 ch.

 

[Zen Mod]

6 pcs per channel are OK , be it 15mF or 33mF

 

[T Leung]

Thanks.
I think I go for a 600VA 30-0-30 transfo and 12 pcs 15mF/ 63Vdc for PSU.

 

[AudioSan]

2x30V transformers will give you close to +/-40V NOT +/-32
i use 6x12.000uF pr ch on "standar" F5.

 

[T Leung]

AudioSan:
Thanks for the helps.
BTW, I read about your threads about dual mono above.
I am sourcing for chassis.
I just wonder if the PSU (Toroid transfo + 16 huge caps) is taken out to a short chassis and leaving all Stereo parts ( inputs & outputs ) in a 17" X 16" X 6" (high ) chassis with the mosfets mounted to the sinks with fins as 2 walls on 2 sides . With the big empty space in the center releases much of the demanding heat sink to 2 moderate sink of 16" X 6" X 1.5" (fin) ?
You know I am a newbie, just curious would it work for at least v2 with 32V rail (or v3 ) .

 

[AudioSan]

hello. if you have a well vented chassis. and +/-32V 4 pair of output fets.
say you bias it at 1.6A . 32x1.6x2=103W pr ch. (40WclassA in 8ohm)
then the 4U400mm(modushop) chassis will be perfect. or if you like to build chassis.
then heatsinksUSA's 10.08" profiles 6" are great. 2 pr side. they can do 130W+ pr side if the outputs are well spaced

 

[AudioSan]

you can also use fisher, aavid and all that. from your local store

 

[T Leung]

Thanks. I figure to use Dual PSU in a ~ 4" high chassis to give 2 X 500W toroidal power house feeding the vented but no fan 4 pairs FET Amp F5 Turbo circuits.
The rectifying cost is mainly the 12 cap anyway and price of 800W toroid may be doubled that of 500W's. In contrast to 2 muscular 10" monoblock chassis building, this alternative approach save some steel for military tanks production

 

[AudioSan]

4" is too smal. 4U=176mm

 

[a.wayne]

Anyword on Boards ...... ? .....

 

[rolandong]

It was a bit exciting how this thread started quite energitic and everyones pouring ideas with UKTOECUTTER's hard work... when will this boards available in diyaudio store?

 

[nrg2009]

So we know we need about 2 six inch heatsinks 12 inches wide with 2 inch fins (HEATSINK USA).
if we used one common sink for cooling the diodes, how large would that be? Could you think of a configuration to have that third heatsink as the front or back panel of the enclosure?
I still like the idea of one enclosure for stereo, but im not sure how to make that work....
Thanks for answering my questions..

 

[AudioSan]

10" wide
the diodes don't need much of heatsinking. the 1.813" sink profile from heatsinksUSA. they must be as long as the distance between the diodes on the far end.
v3 in one stereo chassis? that will be big, or use of fans/watercooling.

 

[cHoc]

These would be nice heatsinks for the people in Europe, as suggested by Jacco, if they want to make their own case.
And not to expensive to (ex vat), Farnell sells these same heatsinks at about 3 times the price.....

SindoPower | Heatsink KL-285 (P3)/120 mm | A SEMIKRON-group company - online sales portal
SindoPower | Heatsink KL-285 (P3)/180 mm | A SEMIKRON-group company - online sales portal

 

[JBL4435]

I there any progress here?

I signed the interest list long ago, but nothing happened till now.