Copying Op Amps to Make Mic Amps

Mar 17, 2007 9 Replies
D

Wow ...3 threads at same time for mic amps. "Improved mic amp posted on Rapidshare" "A Better Microphone Amplifier Yet" "Is S.E.D. actually sci.electronics.dummies"



I'm surprised mic amps are a lively topic on here. I thought it would be a beaten to death topic like audio power amplifier design. Also, by now shouldn't the ultimate microphone amp be a well known cookbook circuit?. Ever since "Mary had a little lamb" (history) there's been plenty of time to master mic amps. Is mic amp design still in fuzzy land?



Copying Op Amps to Make Mic Amps I'm sure the best op amp topologies have been thought out by designers. How about just (partially) copying a very good op amp internal design with discrete low noise transistors for the front end mic circuit? I recall somebody posted that it's the IC process that creates noisy transistors in op amps. D from BC


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J

Nah, the cool thing to do is to take a few ECC85 tubes and copy the opamp with those. Then give the glass of the tubes a spit shine for even lower noise :-)))

Regards, Joerg http://www.analogconsultants.com
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M

yep it's a fun subject But why copy opamp circuits in the first place, they just seem to have copied the discrete version

FWIW this is a newish guy on the block

formatting link

martin

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J

You forgot to mount it inside a glass case, with a brass name plate ;-)

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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J

Ah, you haven't seen the real audio freaks yet. Glass cases are frowned upon. It has to be a polished base and the tubes must stick out. Also, preferably there should be a vintage Gibson casually sitting next to the amplifier even if you can't play the guitar. A lava lamp can't hurt either. A 1960's VW bus with a peace sign in the driveway would also be a nice touch.

Glass is decidedly not cool. Smoked glass would be the worst, as that is identified with the previous generation. I remember a writing on a wall in one of those freak homes: "We are the people our parents always warned us about".

Regards, Joerg http://www.analogconsultants.com
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T

Don't forget to dip them in LN2 -- it "aligns the crystalline structure" for better sound.

Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html
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I

Mic pre design is a complex trade off. There is no perfect design, that's why there are so many.

Ian

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P

"Ian Bell"

** This is an unsupported opinion typical of a " sound engineer ".

Mostly, these dudes live a fantasy world of their own invention.

It sure as hell ain't the real world.

And they do not deal in fact.

....... Phil

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E

It is interesting, but why it's called it "mic" amps is confusing. It seemes to be about comparing the size of organs. :-)

Ed

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