F5 Turbo is posted - Page 36

Tea-Bag · 14th April 2012, 12:13 PM

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.

arche13 · 14th April 2012, 12:22 PM

Thank you Tea-bag

Rush · 14th April 2012, 01:29 PM

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.

If you go to this thread: F5 Turbo Builders Thread

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

AudioSan · 14th April 2012, 03:28 PM

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

Tea-Bag · 14th April 2012, 10:42 PM

Thanks guys, so 10K it is...Either one looks good.

AudioSan · 14th April 2012, 10:46 PM

yes. 10K works for most rail voltages

dimkasta · 26th April 2012, 12:46 AM

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).

flg · 26th April 2012, 02:44 AM

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...

Bksabath · 26th April 2012, 02:46 AM

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

a.wayne · 26th April 2012, 02:54 AM

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 ...

.......

14th April 2012, 03:28 PM	#354
AudioSan 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, 10:46 PM	#356
AudioSan 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

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14th April 2012, 12:22 PM	#352
arche13 diyAudio Member Join Date: Jan 2009	Thank you Tea-bag

14th April 2012, 10:42 PM	#355
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 7	Thanks guys, so 10K it is...Either one looks good.

26th April 2012, 12:46 AM	#357
dimkasta 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).

26th April 2012, 02:46 AM	#359
Bksabath 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