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Old 16th May 2011, 11:52 AM   #11
qusp is offline qusp  Australia
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do want!!

if that thing works as planned, count me in for 2 boards for sure. its sexy!! i also read up on related material to the course you went to when researching an instrumentation amp i built a few weeks ago and it makes sense that done properly ground planes are good for all analogue audio too

i already have some lme49830 and have been looking for the right design to try them with and this looks like it.
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Old 16th May 2011, 11:57 AM   #12
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Quote:
Originally Posted by carlmart View Post
Great design. Congratulations!

Pity you didn't implement any DC servo for it, or DC protection.

Perhaps something like this might be used:

Untitled Document

I found this quite recently and thought it to be a clever idea.

If you add an input switch and an LDR attenuator at the input, you would have a very high quality integrated amp.

Are there any US sources for the MOSFETs?


Carlos
I think the best way would be to contact these guys:

EXICON

Peter
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Old 16th May 2011, 12:06 PM   #13
qusp is offline qusp  Australia
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btw thats a really clever way to mount the lme49830, kudos, took me a minute to confirm the first thought
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Old 16th May 2011, 12:07 PM   #14
marce is offline marce  United Kingdom
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Nice to see ground planes getting good press for a change, I have pointed out on numerous occasions that these have been used for analogue layout for years, and were the norm for analogue boards. having closely couple ground and power layers gives even more protection against hf noise.
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Old 16th May 2011, 12:11 PM   #15
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Originally Posted by PeterDupont View Post
I think the best way would be to contact these guys:

EXICON
They are in Europe, priced in Euros.

I wonder if there's a USA/Canada rep that sells in dollars and might have better prices. Those MOSFETs on the BOM list are quite expensive.
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Old 16th May 2011, 12:21 PM   #16
qusp is offline qusp  Australia
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you can choose whatever currency you wish at exicon. pricey compared to some fets, but not compared to top shelf and as these seem to be manufactured specifically with audio in mind they have my attention
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Old 16th May 2011, 12:50 PM   #17
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Euros or dollars is an euphemism really, in global times as present. Many times parts go low in price when they come to the US.

And I would compare them with bipolar TO3P types, not fets.

Last edited by carlmart; 16th May 2011 at 12:52 PM.
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Old 16th May 2011, 12:52 PM   #18
qusp is offline qusp  Australia
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not from here it isnt, our dollar is worth not a small amount more than the usd at the moment, but not so with eu.
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Old 12th June 2011, 06:10 PM   #19
qusp is offline qusp  Australia
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what happened with this? if there is ever more pcbs i am definitely interested
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Old 15th June 2011, 06:58 AM   #20
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I have received all the parts now but I haven't assembled and tested it yet. I will try to get one unit assembled this weekend and also do some initial testing.
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