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Old 21st February 2012, 03:11 PM   #331
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Originally Posted by UKToecutter View Post
Scott,
I share many of your concerns.
However, there is no way that my wife would entertain an amplifier in the lounge that was 2' high!!!!
For that reason, I choose to go deeper (400mm) rather than higher and I will use some 'Quiet PC' fans.
My heatsinks will be external rather than internal.

I know that DIYer's will come up with many innovative solutions to the problem.
In reallity, however much we simulate, the 'proof of the pudding is in the eating' so the saying goes.
At this point in time I know of no F5 Turbo V2's and V3's that have been built to the new schematic so we don't currently have a benchmark.
Also the dissipation will vary dependant on what each individual chooses for his supply rails and how 'hot' he bias's.
Me, I'm only looking for about 100W into 8 Ohms so I will be conservative with my AC supply.

Comments welcome.....

Andy
100W output at 8ohms, with a good amount of bias will give you about 300W from the wall pr ch. that can not be done from one heatsink without forced cooling.
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Old 21st February 2012, 03:18 PM   #332
rizqi is offline rizqi  Indonesia
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Quote:
Originally Posted by AudioSan View Post
100W output at 8ohms, with a good amount of bias will give you about 300W from the wall pr ch. that can not be done from one heatsink without forced cooling.
I agree with u
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Old 21st February 2012, 03:20 PM   #333
CeeVee is offline CeeVee  Portugal
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Originally Posted by AudioSan View Post
split PCB's will almost be a must for V3 at full power without forced cooling.
V2 can be build as stereo amp. but V3 has to be monoblocks.
monoblocks will be cheeper to, when it comes to heatsinks.
..total agreement.

People entertaining the idea that a 250mm deep stereo V3 is possible...even with forced cooling it would be a task and then some.

V3 is a BEAST no doubt about it.
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Old 21st February 2012, 03:25 PM   #334
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Originally Posted by AudioSan View Post
100W output at 8ohms, with a good amount of bias will give you about 300W from the wall pr ch. that can not be done from one heatsink without forced cooling.
Indeed, which is why I am using forced air cooling.
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Old 21st February 2012, 03:27 PM   #335
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So......

Where does this leave us in terms of PCB layout?

Are we back to the drawing board?
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Old 21st February 2012, 03:29 PM   #336
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Originally Posted by UKToecutter View Post
Indeed, which is why I am using forced air cooling.
but most will not use it. if they can build them as monoblocks, the 5U 500mm chassis from modushop can be used. 2pc for V3 monoblocks. 1pc for V2 stereo amp. every colling issues solved.
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Old 21st February 2012, 03:31 PM   #337
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Originally Posted by AudioSan View Post
but most will not use it. if they can build them as monoblocks, the 5U 500mm chassis from modushop can be used. 2pc for V3 monoblocks. 1pc for V2 stereo amp. every cooling issues solved.
So...

Split N & P channel MOSFET sections and a seperate 1st stage board?
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Old 21st February 2012, 03:32 PM   #338
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Quote:
Originally Posted by AudioSan View Post
100W output at 8ohms, with a good amount of bias will give you about 300W from the wall pr ch
100W continuous output power in 8 Ohm means 40V peak.
Add 5V for losses : 45V rails.

100W Class A in 8 Ohm means 2.5A bias.
With 45V rails : 225W output stage dissipation, of which the heatsinks will have to swallow ~220W.

But why full Class A ?
Bias to 25W in 8, the rest in AB : 110W for the heatsinks !
Still desire full Class A : go fan blown or build yourself a huge stereo power amp.

(me balanced X-files, 50W Class A, rest AB, 2 boards on 1 heatsink tunnel, with those pretty Noctua fans that Ihquam posted)
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Old 21st February 2012, 03:32 PM   #339
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Originally Posted by UKToecutter View Post
So......

Where does this leave us in terms of PCB layout?

Are we back to the drawing board?
how about 2 output boards and one front-end board?
then they dont need to mount front-end board on heatsinks, and it will be easy to adjust bias and ofsett without unbolting the heatsinks.
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Old 21st February 2012, 03:42 PM   #340
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by jacco vermeulen View Post
100W continuous output power in 8 Ohm means 40V peak.
Add 5V for losses : 45V rails.

100W Class A in 8 Ohm means 2.5A bias.
With 45V rails : 225W output stage dissipation, of which the heatsinks will have to swallow ~220W.

But why full Class A ?
Bias to 25W in 8, the rest in AB : 110W for the heatsinks !
Still desire full Class A : go fan blown or build yourself a huge stereo power amp.

(me balanced X-files, 50W Class A, rest AB, 2 boards on 1 heatsink tunnel, with those pretty Noctua fans that Ihquam posted)
This is what i consider a balanced option ...nice choice

Bought a couple of those fans yesterday....very good stuff, perfect for us
they are 12 v, if run at 9...will be dead silent.
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