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Stenor  
#1 Posted : Monday, May 17, 2010 4:22:54 PM(UTC)
Stenor

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Hello

I've built some of your stuff before, and I must say, Greeeaat Sound :d/
Anyway, I bought a Placid BP pcb.
So, the question is this: I can't seem to get a hold of the Panasonic FM's 1000uF 35v. I see they're "Extremely Low ESR", would these EPCOS caps do?
They're very low impedance, but still more than double that of the FM's

So, an Epcos of 1000uF 35v would have esr of 0,038 while the fm is 0,014 i think
I have actually ordered the epcos ones, so Im wondering if there will be any problem with these?

Thanks

Edited by user Tuesday, May 18, 2010 2:15:41 AM(UTC)  | Reason: Not specified

Brian Donegan  
#2 Posted : Tuesday, May 18, 2010 4:00:03 AM(UTC)
Brian Donegan

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They will be just fine.
Stenor  
#3 Posted : Tuesday, May 25, 2010 3:24:03 AM(UTC)
Stenor

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Thank you Brian.

I'm afraid I have another question. Will the OPA228PA do instead of 227?
Now I have to pairs of components that are off, will this combination wrk out.. I don't have equipment to test.
If you have some recommendation, please let me know.
Brian Donegan  
#4 Posted : Tuesday, May 25, 2010 4:31:34 AM(UTC)
Brian Donegan

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The OPA228 is not uity-gain stable, so would not work as well here.
Stenor  
#5 Posted : Tuesday, May 25, 2010 6:31:01 AM(UTC)
Stenor

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Hmm, I think there's a small fault in the BOM. You say OPA227PA, but when looking at the pcb (2.1.2), I see no holes for ic's. So I guess what you mean is OPA227UA.
Brian Donegan  
#6 Posted : Tuesday, May 25, 2010 7:20:33 AM(UTC)
Brian Donegan

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You are correct, I will fix that. I have actually been using LME49710 lately in the kits, so that's another option for you.
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