Digital, real time audio freq spectrum display

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Hi guys,

Im trying to build an amp so i can chop it in to different frequencies using a dsPIC to display on a LCD or on a LED matrix.

The amp circuit uses a 56nF mica cap which is hard to find. Its using Microchip MCP6022 dual op-amp. Any ideas what I can use to substitute the 56nF cap ?? Im guessing micas are used to lessen the noise.

Thanks in advance.
 
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