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Old 5th February 2009, 08:41 AM   #51
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i think the biggest savings from a gb would be on the 3886 chips and the bypass caps...

they add up to a good chunk of money...
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Old 5th February 2009, 08:43 AM   #52
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Quote:
Originally posted by chatziva
i think the biggest savings from a gb would be on the 3886 chips and the bypass caps...

they add up to a good chunk of money...

This is the general idea. There is a huge saving on the 3886. Plus it avoids people having to order from multiple suppliers.
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Old 5th February 2009, 08:54 AM   #53
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indeed.

I am attaching my parts list for the BPA to get started if we decide to go ahead on a gb. I was planning to use these parts on the basis on small quantities for my amp

Feel free to change / improve it

best regards
Evan
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File Type: zip bpa300 parts list b.zip (6.5 KB, 90 views)
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Old 5th February 2009, 08:57 AM   #54
rhysh is offline rhysh  United Kingdom
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Thanks, i will use your part numbers for the resistors from farnell. I was thinking more high end capacitors such as nichicon muse ES etc.
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Old 5th February 2009, 10:50 AM   #55
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Is there anyway to match 3886 chips. I think in a parallel setup it could be beneficial. This amp puts out a prodigous amount of power for a chipamp and matching will keep everything equal, if it can be done.

Are boards still available. I would like 4. I have built 6 of these amps and they sound awesome.

Thanks Tad
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Old 5th February 2009, 11:01 AM   #56
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by tryonziess
Is there anyway to match 3886 chips. I think in a parallel setup it could be beneficial. This amp puts out a prodigous amount of power for a chipamp and matching will keep everything equal, if it can be done.

Are boards still available. I would like 4. I have built 6 of these amps and they sound awesome.

Thanks Tad
It would be possible to match 3886 chips, but the cost would be very high i would expect do to the surplus.

Boards are still available, please add your name to the wiki on the first page.

R
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Old 5th February 2009, 09:32 PM   #57
alvane is offline alvane  Norway
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Numbers are raising, looks promising.

Quick question about the large capacitor (C1), does it need to be 10uF or will the 4.7uF capacitor chatziva used in his spreadsheet work just as good?
Also, what voltage rating does it need to have? 400/630V seems abit high
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Old 5th February 2009, 10:10 PM   #58
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Again feel free to improve

I have chosen the 4.7uf caps instead of 10uf because they were cheaper

I have tried Ansar 2.2uf input caps on my experimentation gainclone with good results.

also note that for C9,11,12,14 I have chosen 8x 1000uf instead of 16x 2200uf again due to price. I was going to try and see how that works. Don't underestimate the Ruby's - their ripple current rating is very good

but obviously with a gb we should be able to get more exotic parts for a good price

Evan
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Old 5th February 2009, 10:24 PM   #59
HaLo6 is offline HaLo6  United States
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I would be in for the kit for 4 of the boards (2 monoblocs)... I am getting an extra 2 in case I screw them up (this is my first amp build)
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Old 7th February 2009, 02:51 PM   #60
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Re chip matching: I can't remember where I've read it but one way to roughly match the chips would be to make sure they have the same serial number - see photo attached.

This number represents location of manufacture i think.

But I would think that if you order a tube of chips they should all have the same serial number anyway, no?

regards
Evan
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File Type: jpg product1411200784533.jpg (24.8 KB, 407 views)
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