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Hey guys,

I know I've been gone for a while because I've been thinking hard about this project I am beginning to do! What this project contains is a microphone - an op amp to boost the audio power then I would like this to be plugged into the ADC input for analysis. For instance, if the Arduino Uno detects a decibel of -60 to -80 decibel then it would trigger a LED to indicate an "abnormality".  Why between -80 to -60? Electronic Voice Phenomenon usually occur at that lowest range. Would it be much wiser if I was just used a comparator instead? Any input would be most appreciated! 
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Hi,

An opamp is a good way to amplify the microphone output. If you start with a small electret condenser type microphone, a single opamp could amplify low level sound into the 0 to 5V you want for the Arduino input.  Make the gain adjustable.

On the http://ArduinoInfo.Info WIKI see: http://arduino-info.wikispaces.com/Popular-ICs and scroll down to NE5532. Follow links to circuits etc..

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Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

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Quote
Electronic Voice Phenomenon usually occur
  ??? What is that? Have a link on wiki?
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Thanks Terry for the input! Yesterday, I purchased the LT1630 from digikey and other components for the equipment. I am unable to show any more details about the device because once the device is done prototyping and field-tested - then it will a finalized product to market to other paranormal investigators.

I'll look at the values that I'll get from arduino soon but what I can say is that I stripped the plug of a headphones; attached it to the Analog Input 0 then plugged the jack into my speakers. Played with the volume a bit while looking at the serial monitor in the Arduino IDE. 

My mind is a bit scattered about but once I get the electret microphone from digikey then I'll analyze the audio coming in from the LT16430 Op Amp.
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