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Old 4th September 2003, 12:45 AM   #1
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Default Aleph 5 - C1 too big?

I'm using Digikey P3517-ND .047 uF cap for C1 on my Aleph 5 board and it doesn't seem to be a very good physical fit. It's alot bigger than the layout on the board and I had to drill out the holes. Did I choose the correct cap and or did everyone else have similar experiences? Here's a pic for communications sake:

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Regards,
Dan
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Old 4th September 2003, 01:05 AM   #2
jam is online now jam  United States
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Dan

A 100v cap would be fine. 630 volt rated caps tend to be a bit large.

Regards,
Jam
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Old 4th September 2003, 02:05 PM   #3
Klaus is offline Klaus  Germany
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Default leave this C out

Volksamp left this feedback C totally out. I saw a simulation of the Aleph2 circuit which also showed that it is totally not required - it limited the high frequencie bandwidth more than necessary for stability reasons. I left it out at my Aleph4 mono block and got a relatively strong sound performance improvement. In spite of the use of a very good and small EMZ KP cap before. Test it, maybe you will agree – and get rid of your high voltage monster…

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Klaus
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Old 4th September 2003, 02:21 PM   #4
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I agree with both comments.....I would get a smaller voltage cap if your sanity would be affected in not having one

DIRT®
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Old 4th September 2003, 04:53 PM   #5
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Dan

C1 in the original aleph 5 schematic is a 25000 uF electrolytic.

If Klaus and Dirt are talking about C6 (680pf), I agree with them.
I did not use C6 (1nf in this case) in my Aleph 1.2's either.

But the only 47nf cap in the aleph 5 schematic is C7 across CE of Q5. If this is the cap you are talking about, I don't think it's wise not to use it.

As a (better???) alternative you could use a 1nf cap across CB of Q5.

In any case check the schematic to make sure that everything is in its place.

Regards,

Nick
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