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Old 21st April 2002, 03:08 PM   #1
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Default Aleph 2 Power R

the Power Resistors in Alpeh2
1 Ohm. use better quality is Better sound?
are they Min 2 W or higher?

the 0.47ohm 's quality is affect to the sound too?
are they at least 5W?

the Cap .001 is meaning
0.001 uf?

thanks.
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Old 21st April 2002, 03:24 PM   #2
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Hello,


With 5W resistors you should have no problems.
The .001 is 0.001uF or 1nF.



Kristijan Kljucaric
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Old 21st April 2002, 03:32 PM   #3
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I mean the 1 ohm and 0.47 ohm
need use hi Quality product? (+-1%)
or common type +-5%is Also ok?
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Old 21st April 2002, 04:33 PM   #4
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Both resistors influence the sound so you should use the best you can afford. Panasonic from Digi-Key are good cheap alternative. I used them in my amps and can't complain.
Tolerance is not that important, 5% resistors should work fine.
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Old 21st April 2002, 04:43 PM   #5
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5% resistors will work ok, but if you can find 1% then use it.

They certainly will not hurt.
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Old 21st April 2002, 10:09 PM   #6
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To the extent that the banks of MOSFETs are matched, it's nice to have everything as predictable as possible further on down the line. If you can find tight-tolerance resistors, by all means use them. It will reduce the variations in current through each output/current source pair, hence lowering the distortion and ensuring more equal load sharing.
That said, I used the blue Panasonic (Matsushita) resistors from Digikey. They are, I believe, 5% tolerance parts.
They are in the signal path. The better quality you use, the better your results will be.

Grey
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Old 22nd April 2002, 11:39 AM   #7
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the Panasonic (Matsushita) resistors from Digikey is 3W?
thanks
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Old 22nd April 2002, 01:43 PM   #8
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Regarding power requirement, someone correct me, but I think it goes something like:

P = I^2.R = 0.5 x 0.5 x 1 = 0.25W

Now, the dynamic current source can double its bias, so we take 2xI = 1W maximum dissipation.

Everyone I have ever spoken to will say allow at least 2x maximum power requirement, so we are now at 2W.

I suspect the 6W resistors I just bought are "way over the top" .......

Which brings me to the point: IF my calculations are correct, then why not just use a number of metal film devices in parallel. They are cheap, easy to come by, have excellent tolerance and have near zero ESL ??

What say the EE-types ....... have I missed something here ??????

cheers, mark
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Old 22nd April 2002, 02:02 PM   #9
nar is offline nar
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Smile Aleph power resistors

Hi Mark.I can see you intend to tune up your A 4 !!
I think the modification will perfectly work.I would do the same,but running 4 resistors in parallel /0.25W 1% from Welwyn
at each power resistor initial place.
Maybe Nelson can light us up,but I think he may not have same interest than ours in this precise point.

Regards
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Old 22nd April 2002, 02:07 PM   #10
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That'll do it.

Grey
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