<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.5.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="34.55" y2="0" width="0" layer="20"/>
<wire x1="34.55" y1="0" x2="34.55" y2="63.125" width="0" layer="20"/>
<wire x1="34.55" y1="63.125" x2="0" y2="63.125" width="0" layer="20"/>
<text>LM324</text>
<hole x="2.5" y="2.5" drill="3"/>
<hole x="31.875" y="2.5" drill="3"/>
<hole x="2.5" y="60.625" drill="3"/>
<hole x="31.875" y="60.625" drill="3"/>
</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="DIL14">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-DiscreteSemi">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find discrete semiconductors- transistors, diodes, TRIACs, optoisolators, etc.&lt;br&gt;&lt;br&gt;
We've spent an enormous amount of time creating and checking these footprints and parts, but it is the end user's responsibility to ensure correctness and suitablity for a given componet or application. 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="TO-92">
<description>&lt;b&gt;TO 92&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="pot">
<description>&lt;b&gt;Potentiometers&lt;/b&gt;&lt;p&gt;
Beckman, Copal, Piher, Spectrol, Schukat&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="3RP/1610N">
<description>&lt;b&gt;16mm Potentiometer&lt;/b&gt; one level&lt;p&gt;
Source: http://www.alphapotentiometers.net/html/16mm_pot_2.html</description>
</package>
</packages>
</library>
<library name="adafruit">
<packages>
<package name="C025-025X050">
<description>&lt;b&gt;CAPACITOR&lt;/b&gt;&lt;p&gt;
grid 2.5 mm, outline 2.5 x 5 mm</description>
</package>
<package name="0204/7">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;p&gt;
type 0204, grid 7.5 mm</description>
</package>
<package name="DO41-10">
<description>&lt;B&gt;DIODE&lt;/B&gt;&lt;p&gt;
diameter 2.54 mm, horizontal, grid 10.16 mm</description>
</package>
<package name="E2-5">
<description>&lt;b&gt;ELECTROLYTIC CAPACITOR&lt;/b&gt;&lt;p&gt;
grid 2.032 mm, diameter 5 mm</description>
</package>
</packages>
</library>
<library name="SparkFun-Connectors">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find connectors and sockets- basically anything that can be plugged into or onto.&lt;br&gt;&lt;br&gt;
We've spent an enormous amount of time creating and checking these footprints and parts, but it is the end user's responsibility to ensure correctness and suitablity for a given componet or application. 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="1X01">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
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</variantdefs>
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<attribute name="VALUE"/>
</element>
<element name="Q1" library="SparkFun-DiscreteSemi" package="TO-92" value="MOSFET-NCHANNEL2N7000"/>
<element name="R1" library="pot" package="3RP/1610N" value="">
<attribute name="VALUE"/>
</element>
<element name="R2" library="pot" package="3RP/1610N" value="100K">
<attribute name="VALUE"/>
</element>
<element name="C1" library="adafruit" package="C025-025X050" value="270nF">
<attribute name="VALUE"/>
</element>
<element name="C2" library="adafruit" package="C025-025X050" value="270nF">
<attribute name="VALUE"/>
</element>
<element name="C3" library="adafruit" package="C025-025X050" value="270nF">
<attribute name="VALUE"/>
</element>
<element name="C4" library="adafruit" package="C025-025X050" value="270nF">
<attribute name="VALUE"/>
</element>
<element name="R3" library="adafruit" package="0204/7" value="100K">
<attribute name="VALUE"/>
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<element name="R4" library="adafruit" package="0204/7" value="10K">
<attribute name="VALUE"/>
</element>
<element name="R5" library="adafruit" package="0204/7" value="100K">
<attribute name="VALUE"/>
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<element name="D1" library="adafruit" package="DO41-10" value="1N4004"/>
<element name="D2" library="adafruit" package="DO41-10" value="1N4004"/>
<element name="R6" library="adafruit" package="0204/7" value="680K">
<attribute name="VALUE"/>
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<element name="R7" library="adafruit" package="0204/7" value="2.7K">
<attribute name="VALUE"/>
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<element name="C5" library="adafruit" package="E2-5" value="100uF">
<attribute name="VALUE"/>
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<element name="R8" library="adafruit" package="0204/7" value="2.7K">
<attribute name="VALUE"/>
</element>
<element name="C7" library="adafruit" package="E2-5" value="100uF">
<attribute name="VALUE"/>
</element>
<element name="JP1" library="SparkFun-Connectors" package="1X01" value="In">
<attribute name="VALUE"/>
</element>
<element name="JP2" library="SparkFun-Connectors" package="1X01" value="Audio In"/>
<element name="C6" library="adafruit" package="C025-025X050" value="100nF">
<attribute name="VALUE"/>
</element>
<element name="R9" library="adafruit" package="0204/7" value="10K">
<attribute name="VALUE"/>
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<element name="R10" library="adafruit" package="0204/7" value="100K">
<attribute name="VALUE"/>
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<element name="R11" library="adafruit" package="0204/7" value="10K">
<attribute name="VALUE"/>
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<element name="R12" library="adafruit" package="0204/7" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C8" library="adafruit" package="C025-025X050" value="100nF">
<attribute name="VALUE"/>
</element>
<element name="JP3" library="SparkFun-Connectors" package="1X01" value="Out">
<attribute name="VALUE"/>
</element>
<element name="JP4" library="SparkFun-Connectors" package="1X01" value="Audio Out"/>
<element name="JP5" library="SparkFun-Connectors" package="1X01" value="Switch">
<attribute name="VALUE"/>
</element>
<element name="JP6" library="SparkFun-Connectors" package="1X01" value="Switch"/>
<element name="JP7" library="SparkFun-Connectors" package="1X01" value="Vcc">
<attribute name="VALUE"/>
</element>
<element name="JP8" library="SparkFun-Connectors" package="1X01" value="Gnd">
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="N$1">
<contactref element="C1" pad="1"/>
<contactref element="C2" pad="2"/>
<contactref element="R4" pad="1"/>
</signal>
<signal name="N$3">
<contactref element="C2" pad="1"/>
<contactref element="C3" pad="2"/>
<contactref element="R5" pad="1"/>
</signal>
<signal name="N$4">
<contactref element="C4" pad="1"/>
<contactref element="C1" pad="2"/>
<contactref element="R3" pad="1"/>
</signal>
<signal name="GND">
<contactref element="R3" pad="2"/>
<contactref element="R5" pad="2"/>
<contactref element="R2" pad="3"/>
<contactref element="R1" pad="1"/>
<contactref element="R8" pad="1"/>
<contactref element="C5" pad="-"/>
<contactref element="C7" pad="-"/>
<contactref element="JP1" pad="1"/>
<contactref element="JP4" pad="1"/>
<contactref element="JP8" pad="1"/>
<contactref element="IC1" pad="11"/>
</signal>
<signal name="N$2">
<contactref element="R4" pad="2"/>
<contactref element="R2" pad="2"/>
<contactref element="R2" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="IC1" pad="7"/>
<contactref element="C3" pad="1"/>
<contactref element="R1" pad="3"/>
<contactref element="D1" pad="A"/>
<contactref element="D2" pad="C"/>
</signal>
<signal name="N$9">
<contactref element="C4" pad="2"/>
<contactref element="IC1" pad="6"/>
<contactref element="R6" pad="1"/>
</signal>
<signal name="N$10">
<contactref element="D1" pad="C"/>
<contactref element="D2" pad="A"/>
<contactref element="R6" pad="2"/>
</signal>
<signal name="N$5">
<contactref element="R7" pad="1"/>
<contactref element="IC1" pad="3"/>
<contactref element="R8" pad="2"/>
<contactref element="C7" pad="+"/>
<contactref element="IC1" pad="5"/>
</signal>
<signal name="VCC">
<contactref element="R7" pad="2"/>
<contactref element="C5" pad="+"/>
<contactref element="JP7" pad="1"/>
<contactref element="IC1" pad="4"/>
</signal>
<signal name="N$6">
<contactref element="JP2" pad="1"/>
<contactref element="C6" pad="2"/>
<contactref element="JP5" pad="1"/>
</signal>
<signal name="N$8">
<contactref element="C6" pad="1"/>
<contactref element="R9" pad="2"/>
</signal>
<signal name="N$11">
<contactref element="R9" pad="1"/>
<contactref element="IC1" pad="2"/>
<contactref element="R12" pad="1"/>
</signal>
<signal name="N$12">
<contactref element="R1" pad="2"/>
<contactref element="R10" pad="1"/>
</signal>
<signal name="N$13">
<contactref element="R10" pad="2"/>
<contactref element="Q1" pad="2"/>
</signal>
<signal name="N$14">
<contactref element="IC1" pad="1"/>
<contactref element="Q1" pad="1"/>
<contactref element="R11" pad="2"/>
<contactref element="C8" pad="1"/>
</signal>
<signal name="N$15">
<contactref element="Q1" pad="3"/>
<contactref element="R11" pad="1"/>
<contactref element="R12" pad="2"/>
</signal>
<signal name="N$16">
<contactref element="C8" pad="2"/>
<contactref element="JP3" pad="1"/>
<contactref element="JP6" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
