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Old 27th September 2005, 08:38 AM   #11
Nordic is offline Nordic  South Africa
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depends on if you are running inverted or not doesn't it...
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Old 27th September 2005, 10:37 AM   #12
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It is the inverting layout.
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Old 27th September 2005, 10:43 AM   #13
Electrons are yellow and more is better!
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Ideally, the inverting input should "see" the same DC resistance as the non-inverting. If so you have eliminated pretty much DC offset.

The gain should be 20-30 if you have normal signals but my recommendation is to start at 20. Don't have more gain than necessary. You will only get more noise.

Rf = 220 K
Rin = 10 k

These are common values but you can choose to have lower.

The only thing I don't like about this configuration is the rather big electrolythic cap at the input. I myself prefer an extremely good buffer AD8620 and a direct connection to the LM3886, see my SMD Gainclone, OK a bit more complicated but why make simple things

Mr. Maria could you enable your email button so I can get in touch with you?
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Old 27th September 2005, 11:06 AM   #14
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Ok, thanks for the input, I will check out the input buffer.

Per Anders, I don't know how to make the e-mail button appear but you can send a mail to maria.anderssson@gmail.com
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Old 27th September 2005, 11:25 AM   #15
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Quote:
The only thing I don't like about this configuration is the rather big electrolythic cap at the input.
hear, hear.


Quote:
Originally posted by maria_andersson
I don't know any good translation for "grabbighet" actually, I'll inform you if I find any good word.
Eager Beaver(s) ?
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Old 27th September 2005, 12:05 PM   #16
Electrons are yellow and more is better!
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Quote:
Originally posted by maria_andersson
Per Anders, I don't know how to make the e-mail button appear but you can send a mail to maria.anderssson@gmail.com
Button at the top
USER CP -> Edit Option- > Hide Email Address? -> Check NO

Another hot tips is also NOT to write your email in plain text becasue of spam reasons. Better to write name (at) domain dot com, or simply fake it a bit.
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Old 27th September 2005, 12:06 PM   #17
Electrons are yellow and more is better!
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Quote:
Originally posted by jacco vermeulen
hear, hear.
Sure, but I still don't like it
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Old 27th September 2005, 12:16 PM   #18
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Ok, I found it,

I think Jacco agreed to your idea with the input buffer PA. Does an input buffer like that help to keep the feed from being 'drained' if you use long interconnects? Or is it just a better DC blocker?

P.S. I read your deal on your homepage about the engineering approach to hifi-electronics. I can only agree that less is not always more. I guess people start to rant about this since if less is added then less is too be understood, which I assume is the hard part. D.S.
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Old 27th September 2005, 12:18 PM   #19
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Also, unrelated question, what's on your picture? a dismembered 'falukorv' or a cactus?
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Old 27th September 2005, 12:28 PM   #20
Electrons are yellow and more is better!
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A living stone, from the Namibia desert and north South Africa.
http://www.mesembs.com/lithops/index.htm
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