Mic Preamp

[Rafa]

Hi:
Im needing a good and powerful SS mic preamp, the ones on sound west host were too complicated or have eq which I dont need.
Any ideas?
Thanks
Rafa

[Aharon]

Hey Rafa,build the GREEN ....I did,it's really nice pre.
http://1176neve.tripod.com/id10.html
If you ned a compressor go for the WHAT.
Same site.



Aharon

[Rafa]

Thanks Ill build it   

[Minion]

I have built a couple Green Pre"s .....they were actually my first real Project....My Impressions were that they are very clean sounding pre"s but were severely lacking in Dynamic Range.....

I recently built a 2 Channel Preamp Based on the INA217 Pre amp Chip and these Preamps are definately Much better sounding than my Green Pre"s....They were also cheaper and easier to build and use the Same PSU as the Green Pre....

Look at the INA217 Datasheet for a Mic preamp design, It is very simple and by adding a simple Ballanced Line driver to the output you get ballanced output (if you need it).....


Cheers

[JimRayden]

Hey Rafa,build the GREEN ....I did,it's really nice pre.

No, this is a really nice pre.

---------
Jimbo

[Aharon]

Here's the datasheet for the INA217
http://focus.ti.com/lit/ds/symlink/ina217.pdf

Aharon

[Rafa]

Mhhh I cant get the ina217 here, any other idea appart from the  GREEN ....?

[Minion]

If you want something simple with acceptable performance that is still Fairly simple then try this:

http://sound.westhost.com/project66.htm

It uses a Discrete Transistor front end which gives Ballanced inputs and uses a generic opamp at the output but it has Unballanced outputs but a simple Line driver at the output will create a ballanced output.....

This schematic doesn"t have phantom power but it can be easilly implemented.....

Also if you don"t want to use Transistors and would rather stick with Opamps you can easilly build a Ballanced input Opamp based Mic pre that would even be simpler...You could simply take Pins 2 and 3 of the XLR input into each a Non-Inverting Opamp with say a Gain of 20 and then the output of Pin 2 (+) opamp would go into the + input of another opamp and Pin 3 (-) ouput would go into the - Input of the opamp and have that Opamp can have an adjustable gain of say 100 and to the output Unballanced....This could be implemented with as little as 3 opamps and about 14 resistors and a few capacitors......


Cheers