Need help to choice a good electrolytic cap

glias · 14th September 2011, 03:32 PM

Hello,
I would want to build a low noise preamp and I'm wondering what is the best cap that I need for AC coupling ?

what are parameters that I have to check to minimize the noise ? ESR ? ESL ? what is the best type for this kind of application? How can I deal with the polarity "problem" ?

Thanks for your help

firechief · 14th September 2011, 04:26 PM

Have you a schematic of the design? You will get a much better response if we can see how the cap inquestion is being used. It matters.

glias · 15th September 2011, 12:41 PM

Hello Firechief,
thanks for your reply, well it's just a simple non inverting stage with an ADA4898 (G=32dB),
50 ohms resistor on the minus input to ground and a feeback resistor of 2k, and AC coupling on the + input with this cap...

14th September 2011, 03:32 PM	#1
glias diyAudio Member Join Date: Sep 2011	Need help to choice a good electrolytic cap Hello, I would want to build a low noise preamp and I'm wondering what is the best cap that I need for AC coupling ? what are parameters that I have to check to minimize the noise ? ESR ? ESL ? what is the best type for this kind of application? How can I deal with the polarity "problem" ? Thanks for your help

14th September 2011, 04:26 PM	#2
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	Have you a schematic of the design? You will get a much better response if we can see how the cap inquestion is being used. It matters. __________________ "You can keep your insurance baby nothing is guaranteed" -Tom Petty

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15th September 2011, 12:41 PM	#3
glias diyAudio Member Join Date: Sep 2011	Hello Firechief, thanks for your reply, well it's just a simple non inverting stage with an ADA4898 (G=32dB), 50 ohms resistor on the minus input to ground and a feeback resistor of 2k, and AC coupling on the + input with this cap...

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