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Old 6th November 2008, 05:09 PM   #1
valo is offline valo  Norway
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Question 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
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Old 6th November 2008, 05:56 PM   #2
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I think you should make trip over to passlabs forum, that is if you like class a Amps. Put this same question there.
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Old 6th November 2008, 06:02 PM   #3
valo is offline valo  Norway
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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
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Old 6th November 2008, 06:18 PM   #4
wg_ski is offline wg_ski  United States
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Default 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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Old 6th November 2008, 06:28 PM   #5
valo is offline valo  Norway
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Default Re: Need more cowbell

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
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Old 6th November 2008, 09:19 PM   #6
wg_ski is offline wg_ski  United States
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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.
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Old 6th November 2008, 09:30 PM   #7
valo is offline valo  Norway
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Class H is new to me .. not sure if i have heard of it
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Old 6th November 2008, 09:59 PM   #8
Nrik is offline Nrik  Denmark
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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
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Old 6th November 2008, 10:03 PM   #9
Nrik is offline Nrik  Denmark
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...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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