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diyAudio Member

Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
Quote:
 Originally Posted by AudioSan not realy. if you got +/-100V rails, then you want some higher then 10K. 100/(10K+4.75K)X4.75K=32.2V. 100/(47.5K+4.75K)x4.75K=9.1V
Can you elaborate on what effect this has on cascade. I am still trying to figure this out. It's not symmetrical, so it's hard to figure.

One for 32v and 50v would be good examples.
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 14th April 2012, 12:22 PM #352 diyAudio Member   Join Date: Jan 2009 Thank you Tea-bag
diyAudio Member

Join Date: Sep 2009
Location: Tampa, Florida
Quote:
 Originally Posted by Tea-Bag Can you elaborate on what effect this has on cascade. I am still trying to figure this out. It's not symmetrical, so it's hard to figure. One for 32v and 50v would be good examples.

And read before and after Jacco's post.

If the link doesn't take you, it is the "F5 Turbo Builders Thread" page 14 at 10 posts per page.

It is supposed to be symmetrical, Papa was probably showing the extreme values for high and low rail voltage, both R25 and R26 should be equal.

Rush

 14th April 2012, 03:28 PM #354 diyAudio Member   Join Date: Feb 2009 Location: Trondheim cascode referance voltage = rail voltage/(R25+R27)xR27 so for 50V rails it will be: 50/(10K+4.75K)x4.75K= 16.1V for 32Vrails: 32/(10K+4.75K)x4.75K= 10.3V __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers
 14th April 2012, 10:42 PM #355 not politcally affiliated diyAudio Member     Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7 Thanks guys, so 10K it is...Either one looks good.
 14th April 2012, 10:46 PM #356 diyAudio Member   Join Date: Feb 2009 Location: Trondheim yes. 10K works for most rail voltages __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers
 26th April 2012, 12:46 AM #357 Dimitris diyAudio Member     Join Date: May 2010 Location: Athens Guys any F5T topology suggestions for 1.7 maggies? I m looking for a more educated opinion from people who are more experienced with how the F5T might actually perform with such difficult loads (math aside).
diyAudio Member

Join Date: Jul 2005
Location: North East
Quote:
 Originally Posted by dimkasta Guys any F5T topology suggestions for 1.7 maggies? I m looking for a more educated opinion from people who are more experienced with how the F5T might actually perform with such difficult loads (math aside).
F5 For Low Z Loads ?
Might be some interesting stuff here. Predates the article a little but the same as Version 1 I guess. They;'ll be some updates in a week or two...
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 26th April 2012, 02:46 AM #359 diyAudio Member     Join Date: Dec 2007 Sorry but I think no one has much experience with the Turbo. My 2 cent with F5 on 4 homs PolkLSi15 (probably easier load) Think about big heat sink and then duble that go for 4 or more mosfets on each suply rail crank up bias as much as sink can cope (top of head figure is no more than 50 W dissipation on each mosfet) I have F5 running on twin whitout the current limiters and it works preaty well with polks
diyAudio Member

Join Date: May 2008
Location: Front Row Center
Quote:
 Originally Posted by flg F5 For Low Z Loads ? Might be some interesting stuff here. Predates the article a little but the same as Version 1 I guess. They;'ll be some updates in a week or two...
I'm just glad you are not moving ..... Again ... .......

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