what to do whit this

valo · 6th November 2008, 05:09 PM

Hi

I have alot of nice parts under my bed

40 pcs of Rifa PEH169 15000uF/40V
100 pcs IRFP450 from Harris
A new toroid 2x21V /1000VA

So what can I make of this ?, i have been thinking of a 5CH amp but i cant find any circuts that i can use my parts in..

Iam thankfull for all the help i can get, and sorry for my spelling

homemodder · 6th November 2008, 05:56 PM

I think you should make trip over to passlabs forum, that is if you like class a Amps. Put this same question there.

valo · 6th November 2008, 06:02 PM

Quote:

Originally posted by homemodder
I think you should make trip over to passlabs forum, that is if you like class a Amps. Put this same question there.

class a amps are lovely, and i have already built one Aleph amp, but they have one big problem and its the heat , i dont want to use big heatsinks and fan's to keep it cold, so a class a/b or just class b will be good for me

wg_ski · 6th November 2008, 06:18 PM

Or secondary voltage to be really useful. Can you add turns to the secondaries, or is it potted in the center?

valo · 6th November 2008, 06:28 PM

Quote:

Originally posted by wg_ski
Or secondary voltage to be really useful. Can you add turns to the secondaries, or is it potted in the center?

Sure i can add more turns, the sec voltage is low, but i cant step over 40vdc , since my caps are rated 40v and i want to use them .. guess whit a sec of 21v it will give me about 30vdc, so i can add som turns mabe take it to 35 vdc

wg_ski · 6th November 2008, 09:19 PM

How about stacking four 30-35V? That will get you up to something respectable with those 40V caps. Then you could even do class H and not need much of a heat sink.

valo · 6th November 2008, 09:30 PM

Class H is new to me .. not sure if i have heard of it

Nrik · 6th November 2008, 09:59 PM

No forget class H, stick with A or AB - they sound best.

So you want:
- higher voltage /power than from 21v sec
- class AB
- N-channel FET output (quasicomplemntary)

My suggestion is:
Make 10 of the "Legend" by Dr. Bora ( use the search function)
and drive your 5 channels balanced.
It would be an effektive use of most of your nice parts

Nrik · 6th November 2008, 10:03 PM

...allthough with 5x200-240W per channel you might be pushing the toroid at full power. So drive the front L and front R balanced meaning 'only' 7 amplifiers.

...and if you have 8 leftovers caps, then I could sure find some use for them

6th November 2008, 05:09 PM	#1
valo diyAudio Member Join Date: Nov 2003 Location: bodÃ¸	what to do whit this Hi I have alot of nice parts under my bed 40 pcs of Rifa PEH169 15000uF/40V 100 pcs IRFP450 from Harris A new toroid 2x21V /1000VA So what can I make of this ?, i have been thinking of a 5CH amp but i cant find any circuts that i can use my parts in.. Iam thankfull for all the help i can get, and sorry for my spelling

6th November 2008, 06:18 PM	#4
wg_ski diyAudio Member Join Date: Oct 2007	Need more cowbell Or secondary voltage to be really useful. Can you add turns to the secondaries, or is it potted in the center?

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6th November 2008, 05:56 PM	#2
homemodder diyAudio Member Join Date: May 2006	I think you should make trip over to passlabs forum, that is if you like class a Amps. Put this same question there.

6th November 2008, 09:19 PM	#6
wg_ski diyAudio Member Join Date: Oct 2007	How about stacking four 30-35V? That will get you up to something respectable with those 40V caps. Then you could even do class H and not need much of a heat sink.

6th November 2008, 09:30 PM	#7
valo diyAudio Member Join Date: Nov 2003 Location: bodÃ¸	Class H is new to me .. not sure if i have heard of it

6th November 2008, 09:59 PM	#8
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	No forget class H, stick with A or AB - they sound best. So you want: - higher voltage /power than from 21v sec - class AB - N-channel FET output (quasicomplemntary) My suggestion is: Make 10 of the "Legend" by Dr. Bora ( use the search function) and drive your 5 channels balanced. It would be an effektive use of most of your nice parts

6th November 2008, 10:03 PM	#9
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	...allthough with 5x200-240W per channel you might be pushing the toroid at full power. So drive the front L and front R balanced meaning 'only' 7 amplifiers. ...and if you have 8 leftovers caps, then I could sure find some use for them

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