<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="6.1">
<drawing>
<board>
<plain>
<wire x1="-2.54" y1="30.47" x2="-2.54" y2="1.27" width="0" layer="20"/>
<wire x1="-2.54" y1="1.27" x2="0" y2="-1.27" width="0" layer="20" curve="90"/>
<wire x1="0" y1="-1.27" x2="39.04" y2="-1.27" width="0" layer="20"/>
<wire x1="39.04" y1="-1.27" x2="41.58" y2="1.27" width="0" layer="20" curve="90"/>
<wire x1="41.58" y1="1.27" x2="41.58" y2="30.47" width="0" layer="20"/>
<wire x1="41.58" y1="30.47" x2="39.04" y2="33.01" width="0" layer="20" curve="90"/>
<wire x1="39.04" y1="33.01" x2="0" y2="33.01" width="0" layer="20"/>
<wire x1="0" y1="33.01" x2="-2.54" y2="30.47" width="0" layer="20" curve="90"/>
<text>MIC+</text>
<text>GND</text>
<text>OUT+</text>
<text>GND</text>
<text>GND</text>
<text>9+</text>
<text>TL071P</text>
<text>MIC</text>
<text>POW</text>
<text>GAIN</text>
</plain>
<libraries>
<library name="linear">
<description>&lt;b&gt;Linear Devices&lt;/b&gt;&lt;p&gt;
Operational amplifiers,  comparators, voltage regulators, ADCs, DACs, etc.&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="DIL08">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
We've spent an enormous amount of time creating and checking these footprints and parts. If you enjoy using this library, please buy one of our products at www.sparkfun.com.
&lt;br&gt;&lt;br&gt;
&lt;b&gt;Licensing:&lt;/b&gt; CC v3.0 Share-Alike You are welcome to use this library for commercial purposes. For attribution, we ask that when you begin to sell your device using our footprint, you email us with a link to the product being sold. We want bragging rights that we helped (in a very small part) to create your 8th world wonder. We would like the opportunity to feature your device on our homepage.</description>
<packages>
<package name="AXIAL-0.3">
</package>
<package name="POT_ALPHA_RV16AF-20">
<description>Package for Alpha RV16AF-20 potentiometer</description>
</package>
<package name="CPOL-RADIAL-100UF-25V">
</package>
<package name="CAP-PTH-5MM">
</package>
<package name="STAND-OFF">
<description>&lt;b&gt;Stand Off&lt;/b&gt;&lt;p&gt;
This is the mechanical footprint for a #4 phillips button head screw. Use the keepout ring to avoid running the screw head into surrounding components. SKU : PRT-00447</description>
</package>
</packages>
</library>
<library name="twomey">
<packages>
<package name="1X2-3.5MM">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="IC1" library="linear" package="DIL08" value="TL071P"/>
<element name="R1" library="SparkFun" package="AXIAL-0.3" value="10k"/>
<element name="VOL" library="SparkFun" package="POT_ALPHA_RV16AF-20" value="100k"/>
<element name="C1" library="SparkFun" package="CPOL-RADIAL-100UF-25V" value="100uF"/>
<element name="C2" library="SparkFun" package="CAP-PTH-5MM" value="0.1uF"/>
<element name="MIC_IN" library="twomey" package="1X2-3.5MM" value=""/>
<element name="POW" library="twomey" package="1X2-3.5MM" value=""/>
<element name="A_OUT" library="twomey" package="1X2-3.5MM" value=""/>
<element name="R2" library="SparkFun" package="AXIAL-0.3" value="100k"/>
<element name="R3" library="SparkFun" package="AXIAL-0.3" value="100k"/>
<element name="R4" library="SparkFun" package="AXIAL-0.3" value="1k"/>
<element name="R5" library="SparkFun" package="AXIAL-0.3" value="2.2k"/>
<element name="C3" library="SparkFun" package="CPOL-RADIAL-100UF-25V" value="47uF"/>
<element name="R6" library="SparkFun" package="AXIAL-0.3" value="47"/>
<element name="C4" library="SparkFun" package="CAP-PTH-5MM" value="0.1uF"/>
<element name="C5" library="SparkFun" package="CPOL-RADIAL-100UF-25V" value="22uF"/>
<element name="JP1" library="SparkFun" package="STAND-OFF" value="STAND-OFF"/>
<element name="JP2" library="SparkFun" package="STAND-OFF" value="STAND-OFF"/>
<element name="JP3" library="SparkFun" package="STAND-OFF" value="STAND-OFF"/>
<element name="JP4" library="SparkFun" package="STAND-OFF" value="STAND-OFF"/>
</elements>
<signals>
<signal name="N$1">
<contactref element="IC1" pad="6"/>
<contactref element="C4" pad="1"/>
<contactref element="VOL" pad="1"/>
</signal>
<signal name="N$2">
<contactref element="C4" pad="2"/>
<contactref element="R6" pad="P$2"/>
</signal>
<signal name="N$3">
<contactref element="VOL" pad="3"/>
<contactref element="R5" pad="P$2"/>
<contactref element="IC1" pad="2"/>
<contactref element="VOL" pad="2"/>
</signal>
<signal name="N$4">
<contactref element="R5" pad="P$1"/>
<contactref element="C5" pad="1"/>
</signal>
<signal name="AGND">
<contactref element="POW" pad="1"/>
<contactref element="IC1" pad="4"/>
<contactref element="C5" pad="2"/>
<contactref element="A_OUT" pad="1"/>
<contactref element="R3" pad="P$1"/>
<contactref element="MIC_IN" pad="2"/>
<contactref element="C3" pad="2"/>
<contactref element="C1" pad="2"/>
</signal>
<signal name="+9V">
<contactref element="POW" pad="2"/>
<contactref element="IC1" pad="7"/>
<contactref element="R4" pad="P$1"/>
<contactref element="C1" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="R6" pad="P$1"/>
<contactref element="A_OUT" pad="2"/>
</signal>
<signal name="N$5">
<contactref element="R3" pad="P$2"/>
<contactref element="IC1" pad="3"/>
<contactref element="C2" pad="2"/>
<contactref element="R2" pad="P$1"/>
</signal>
<signal name="N$8">
<contactref element="R2" pad="P$2"/>
<contactref element="R4" pad="P$2"/>
<contactref element="R1" pad="P$2"/>
<contactref element="C3" pad="1"/>
</signal>
<signal name="N$9">
<contactref element="R1" pad="P$1"/>
<contactref element="C2" pad="1"/>
<contactref element="MIC_IN" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
