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F5 Turbo Builders Thread
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Old 5th December 2012, 02:42 AM   #601
AudioSan is offline AudioSan  Norway
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buzz. you know me
heatsinked man i'll use 2x10.080 profiles 6"long pr side. and drive them to maximum
acording to latest numbers. i will get the heat spread maximum over this field so i guess i'm good only the bias will tell

i will however run it on a BIT higher rail voltage. +/-51V or there about and still maintain about 2.6A bias

Last edited by AudioSan; 5th December 2012 at 02:45 AM.
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Old 5th December 2012, 03:13 AM   #602
dazed2 is offline dazed2  Canada
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Will 4 11" profile at 10" high be enough for one channel?
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Old 5th December 2012, 03:18 AM   #603
AudioSan is offline AudioSan  Norway
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daz. it's antek profiles you are thinking of?
they are made for forced air. so i don't know. the fins are a little close.
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Old 5th December 2012, 04:22 AM   #604
AudioSan is offline AudioSan  Norway
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okei. have run some PSU tests now.
with 2x40V transformer. i end up with +/-50-51V supply.
(yes it is 63V caps). so. with a +/-50V supply and 1000VA pr ch. and 4x68.000uF.
the PSU is behaving very good. all seams fine..
no reason for you to be nerves
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Old 5th December 2012, 04:24 AM   #605
dazed2 is offline dazed2  Canada
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Yep they are the Antek ones.
I'm using them at 8" high for my F5 now biasing at 1.6A
They get hot but I can put my hand on it for at least 20s
I think the last time I checked they run at 50C at 25C room temp


When you start adding the amp board to it what voltage drop do you get? 4-5V? or about 45-46V rail?

Last edited by dazed2; 5th December 2012 at 04:26 AM.
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Old 5th December 2012, 04:31 AM   #606
AudioSan is offline AudioSan  Norway
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okei daz then they are big and can handle it
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Old 5th December 2012, 01:56 PM   #607
BigE is offline BigE  Canada
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Are the sinks from heatsink USA more appropriate? You can order them as tall as you like.
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Old 5th December 2012, 02:26 PM   #608
buzzforb is offline buzzforb  United States
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I have trid to talk my wife into using these instead of central heating. Best excuse i could come up with to make mroe amps.
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...Shape the sound , Man!
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Old 5th December 2012, 02:52 PM   #609
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by dazed2 View Post
Hmm so this means to get the final 50Vpk loaded, I will need about 55Vpk unloaded
which means 55V = 1.3 x 42Vsec from the transformer.

This will mean that : 50Vpk /1.414 =35.36V and solve P=V^2 /R(8ohm) I should get 156Watts?!
What about efficiency factor ....?
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Old 5th December 2012, 03:36 PM   #610
BigE is offline BigE  Canada
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This looks like some good reading!

Amplifier Efficiency
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