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Old 11th October 2005, 02:49 AM   #1
sopapo is offline sopapo  Spain
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Default High Quality Mic Preamp?

Hello I would like to make a quality mic preamp for recording to the computer--

Do know for a schematic or proyect for this?


I look for a solid state design, it can be opamps ,discrete etc I dont care what opamp if needed I have 627,6204,2134 several AD I mean that I dont care if is a design with a expensive opamp.... I don t care if the design use a transformer or not...

I have been looking around the web and the information looks very dispersed...

If you can help me a little I'll apreciate it..

Thanks for your time
Best regards
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Old 11th October 2005, 05:14 AM   #2
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You could check out Walt Jung's book about opamps, free of charge, just download it.

Can't find the link right now. I'll be back later with the link.
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Old 11th October 2005, 05:42 AM   #3
jcx is offline jcx  United States
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you could narrow down your requirements by specifying a particular mic - sensitivity, ouput Z, exected spl, ...

walt's book:

http://www.analog.com/library/analog..._handbook.html
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Old 11th October 2005, 05:56 AM   #4
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Maybe it's a usb powered 70V variable pattern cardiod condenser mic needing 50M loading, he's after?

Cheers,
Greg
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Old 11th October 2005, 05:04 PM   #5
sopapo is offline sopapo  Spain
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thanks for you answers...I have a dinamic shure 57 that I use to mic a cabinet of my guitar amp.... and I would like to build a preamp for this mic that has certain quality.....I was looking in this forum and in the web and dont find nothing representative...I mean a preamp design with quality in mind.......

Thanks for the jung link jcx and peranders...

I was looking for a IC design preferably transformerless....I know that the top qualiry preamp it usually put a transformer inside....but there are too comercially available some models without it...

Thanks
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Old 11th October 2005, 05:06 PM   #6
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Borbely Audio has two mic preamps. One with and one without transformer. DC coupled. JFETs only.

http://www.borbelyaudio.com/eb103213.asp





Sigurd
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Old 12th October 2005, 03:44 PM   #7
jcx is offline jcx  United States
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at 200 Ohms source impedance you'll be giving up some s/n with fet input op amps, this is AD797, LT1028 territory noise wise - discrete low noise bjt or fet front end would also be an option unless you use a xfmr
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Old 13th October 2005, 03:36 AM   #8
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Hi sopapo,

I'll second jcx here, the LT1028 would do this admirably. If your SM57 is anything like the ubiquitous SM58, the singers mic, with it's high treble peak giving lots of 'air' and 'detail' , you will do well to err on the side of very low noise. Good supply range will benefit your dynamic range - making it harder to overload.

Cheers,
Greg
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