<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.4.0">
<drawing>
<board>
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<wire x1="13.97" y1="0" x2="77.47" y2="0" width="0" layer="20"/>
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</plain>
<libraries>
<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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="AUDIO-JACK">
</package>
</packages>
</library>
<library name="SparkFun-Capacitors">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find resistors, capacitors, inductors, test points, jumper pads, 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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="0603-CAP">
</package>
<package name="CPOL-RADIAL-100UF-25V">
</package>
<package name="0805">
</package>
</packages>
</library>
<library name="SparkFun-LED">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find discrete LEDs for illumination or indication, but no displays.&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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="LED3MM">
<description>&lt;B&gt;LED&lt;/B&gt;&lt;p&gt;
3 mm, round</description>
</package>
</packages>
</library>
<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="SO14">
<description>&lt;b&gt;Small Outline Package 14&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-Passives">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find resistors, capacitors, inductors, test points, jumper pads, 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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="0603-RES">
</package>
<package name="0805">
</package>
</packages>
</library>
<library name="SparkFun-Electromechanical">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find anything that moves- switches, relays, buttons, potentiometers. Also, anything that goes on a board but isn't electrical in nature- screws, standoffs, 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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="SWITCH-SPDT">
</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>
<package name="BATTERY-AA">
</package>
</packages>
</library>
<library name="tle2426">
<packages>
<package name="TO226AA">
<description>TO-226AA</description>
</package>
</packages>
</library>
<library name="homegrown">
<packages>
<package name="DIP16-SOCKET">
<description>&lt;b&gt;Dual In Line Socket&lt;/b&gt;</description>
</package>
<package name="SOT23-5L">
<description>&lt;b&gt;Small Outline Transistor&lt;/b&gt;&lt;p&gt;
package type OT</description>
</package>
<package name="PTD901">
</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; Creative Commons ShareAlike 4.0 International - https://creativecommons.org/licenses/by-sa/4.0/ 
&lt;br&gt;&lt;br&gt;
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="SOD-123">
<description>100V/150mA 1N4148 - Super Cheap</description>
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
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<element name="C2" library="SparkFun-Capacitors" package="0603-CAP" value="560p"/>
<element name="C3" library="SparkFun-Capacitors" package="0603-CAP" value="560p"/>
<element name="C4" library="SparkFun-Capacitors" package="0603-CAP" value="560p"/>
<element name="C5" library="SparkFun-Capacitors" package="CPOL-RADIAL-100UF-25V" value=""/>
<element name="D1" library="SparkFun-LED" package="LED3MM" value=""/>
<element name="IC1" library="linear" package="SO14" value="OPA4227D"/>
<element name="IN1" library="SparkFun-Connectors" package="AUDIO-JACK" value=""/>
<element name="OUT1" library="SparkFun-Connectors" package="AUDIO-JACK" value=""/>
<element name="OUT2" library="SparkFun-Connectors" package="AUDIO-JACK" value=""/>
<element name="R1" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="R10" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="R13" library="SparkFun-Passives" package="0603-RES" value="1K"/>
<element name="R2" library="SparkFun-Passives" package="0603-RES" value="499"/>
<element name="R3" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="R4" library="SparkFun-Passives" package="0603-RES" value="499"/>
<element name="R5" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="R6" library="SparkFun-Passives" package="0603-RES" value="499"/>
<element name="R7" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="R8" library="SparkFun-Passives" package="0603-RES" value="499"/>
<element name="R9" library="SparkFun-Passives" package="0603-RES" value="30K"/>
<element name="S1" library="SparkFun-Electromechanical" package="SWITCH-SPDT" value="">
<attribute name="PROD_ID" value="SWCH-08261"/>
</element>
<element name="TLE" library="tle2426" package="TO226AA" value="TLE2426CLP"/>
<element name="VCA1" library="homegrown" package="DIP16-SOCKET" value="COOLAUDIO-V2164D"/>
<element name="R14" library="SparkFun-Passives" package="0603-RES" value="10K"/>
<element name="R15" library="SparkFun-Passives" package="0603-RES" value="1.5K"/>
<element name="R24" library="SparkFun-Passives" package="0603-RES" value="10K"/>
<element name="R25" library="SparkFun-Passives" package="0603-RES" value="1.5K"/>
<element name="STANDOFF1" library="SparkFun-Electromechanical" package="STAND-OFF" value="STAND-OFF"/>
<element name="STANDOFF2" library="SparkFun-Electromechanical" package="STAND-OFF" value="STAND-OFF"/>
<element name="STANDOFF3" library="SparkFun-Electromechanical" package="STAND-OFF" value="STAND-OFF"/>
<element name="STANDOFF4" library="SparkFun-Electromechanical" package="STAND-OFF" value="STAND-OFF"/>
<element name="C6" library="SparkFun-Passives" package="0805" value="1u"/>
<element name="C7" library="SparkFun-Passives" package="0805" value="1u"/>
<element name="C8" library="SparkFun-Passives" package="0805" value="1u"/>
<element name="C9" library="SparkFun-Passives" package="0805" value="1u"/>
<element name="IN2" library="SparkFun-Connectors" package="AUDIO-JACK" value=""/>
<element name="BAT1" library="SparkFun-Electromechanical" package="BATTERY-AA" value=""/>
<element name="BAT2" library="SparkFun-Electromechanical" package="BATTERY-AA" value=""/>
<element name="LMR" library="homegrown" package="SOT23-5L" value="LMR62014"/>
<element name="D2" library="SparkFun-DiscreteSemi" package="SOD-123" value=""/>
<element name="R16" library="SparkFun-Passives" package="0603-RES" value="88k"/>
<element name="R17" library="SparkFun-Passives" package="0603-RES" value="13.3k"/>
<element name="L1" library="SparkFun-Passives" package="0805" value="10uH"/>
<element name="C10" library="SparkFun-Capacitors" package="0603-CAP" value="2.2u"/>
<element name="C11" library="SparkFun-Capacitors" package="0603-CAP" value="330p"/>
<element name="C12" library="SparkFun-Capacitors" package="0805" value="4.7u"/>
<element name="VOL1" library="homegrown" package="PTD901" value="PTD901"/>
<element name="VOL2" library="homegrown" package="PTD901" value="PTD901"/>
<element name="C13" library="SparkFun-Capacitors" package="0805" value="0.1u"/>
<element name="C14" library="SparkFun-Capacitors" package="0805" value="0.1u"/>
</elements>
<signals>
<signal name="N$1">
<contactref element="R1" pad="2"/>
<contactref element="R2" pad="2"/>
<contactref element="VCA1" pad="2"/>
</signal>
<signal name="N$2">
<contactref element="R2" pad="1"/>
<contactref element="C1" pad="1"/>
</signal>
<signal name="GND">
<contactref element="C1" pad="2"/>
<contactref element="C2" pad="2"/>
<contactref element="C3" pad="2"/>
<contactref element="C4" pad="2"/>
<contactref element="VCA1" pad="8"/>
<contactref element="IN1" pad="SLEEVE"/>
<contactref element="IC1" pad="5"/>
<contactref element="IC1" pad="10"/>
<contactref element="IC1" pad="12"/>
<contactref element="IC1" pad="3"/>
<contactref element="OUT2" pad="SLEEVE"/>
<contactref element="OUT1" pad="SLEEVE"/>
<contactref element="C6" pad="2"/>
<contactref element="C7" pad="1"/>
<contactref element="C8" pad="1"/>
<contactref element="C9" pad="1"/>
<contactref element="IN2" pad="SLEEVE"/>
<contactref element="TLE" pad="1"/>
<contactref element="C14" pad="2"/>
<contactref element="C13" pad="2"/>
</signal>
<signal name="N$3">
<contactref element="R4" pad="2"/>
<contactref element="R3" pad="2"/>
<contactref element="VCA1" pad="7"/>
</signal>
<signal name="N$4">
<contactref element="R4" pad="1"/>
<contactref element="C2" pad="1"/>
</signal>
<signal name="N$5">
<contactref element="R5" pad="2"/>
<contactref element="R6" pad="2"/>
<contactref element="VCA1" pad="10"/>
</signal>
<signal name="N$6">
<contactref element="R6" pad="1"/>
<contactref element="C3" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="R7" pad="2"/>
<contactref element="R8" pad="2"/>
<contactref element="VCA1" pad="15"/>
</signal>
<signal name="N$8">
<contactref element="R8" pad="1"/>
<contactref element="C4" pad="1"/>
</signal>
<signal name="VCC">
<contactref element="IC1" pad="4"/>
<contactref element="R25" pad="1"/>
<contactref element="R15" pad="1"/>
<contactref element="C7" pad="2"/>
<contactref element="VCA1" pad="16"/>
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<contactref element="C8" pad="2"/>
<contactref element="TLE" pad="3"/>
<contactref element="R13" pad="2"/>
<contactref element="C5" pad="1"/>
<contactref element="R16" pad="2"/>
<contactref element="C11" pad="2"/>
<contactref element="D2" pad="C"/>
<contactref element="C12" pad="1"/>
</signal>
<signal name="VDD">
<contactref element="IC1" pad="11"/>
<contactref element="TLE" pad="2"/>
<contactref element="D1" pad="K"/>
<contactref element="C5" pad="2"/>
<contactref element="R24" pad="2"/>
<contactref element="R14" pad="2"/>
<contactref element="C6" pad="1"/>
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<contactref element="C9" pad="2"/>
<contactref element="C9" pad="2"/>
<contactref element="C12" pad="2"/>
<contactref element="C10" pad="2"/>
<contactref element="BAT2" pad="GND@1"/>
<contactref element="R17" pad="1"/>
<contactref element="LMR" pad="2"/>
</signal>
<signal name="N$9">
<contactref element="IN1" pad="TIP"/>
<contactref element="R1" pad="1"/>
</signal>
<signal name="N$10">
<contactref element="IN1" pad="RING"/>
<contactref element="R3" pad="1"/>
</signal>
<signal name="N$11">
<contactref element="VCA1" pad="3"/>
<contactref element="VCA1" pad="6"/>
<contactref element="VOL1" pad="P$2"/>
<contactref element="C14" pad="1"/>
</signal>
<signal name="N$12">
<contactref element="VCA1" pad="14"/>
<contactref element="VCA1" pad="11"/>
<contactref element="VOL2" pad="P$2"/>
<contactref element="C13" pad="1"/>
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<signal name="N$33">
<contactref element="D1" pad="A"/>
<contactref element="R13" pad="1"/>
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<contactref element="IC1" pad="1"/>
<contactref element="R9" pad="2"/>
<contactref element="OUT1" pad="TIP"/>
<contactref element="OUT2" pad="TIP"/>
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<signal name="N$20">
<contactref element="R10" pad="2"/>
<contactref element="OUT1" pad="RING"/>
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<contactref element="OUT2" pad="RING"/>
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<signal name="N$39">
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<signal name="N$25">
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<contactref element="IC1" pad="2"/>
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<signal name="N$44">
<contactref element="R7" pad="1"/>
<contactref element="IN2" pad="RING"/>
</signal>
<signal name="N$14">
<contactref element="BAT1" pad="GND@1"/>
<contactref element="BAT2" pad="PWR@1"/>
</signal>
<signal name="N$17">
<contactref element="BAT1" pad="PWR@1"/>
<contactref element="S1" pad="2"/>
</signal>
<signal name="N$18">
<contactref element="S1" pad="1"/>
<contactref element="LMR" pad="5"/>
<contactref element="LMR" pad="4"/>
<contactref element="L1" pad="1"/>
<contactref element="C10" pad="1"/>
</signal>
<signal name="N$23">
<contactref element="LMR" pad="1"/>
<contactref element="D2" pad="A"/>
<contactref element="L1" pad="2"/>
</signal>
<signal name="N$26">
<contactref element="LMR" pad="3"/>
<contactref element="R16" pad="1"/>
<contactref element="R17" pad="2"/>
<contactref element="R17" pad="2"/>
<contactref element="C11" pad="1"/>
</signal>
<signal name="N$29">
<contactref element="R10" pad="1"/>
<contactref element="IC1" pad="6"/>
<contactref element="VCA1" pad="5"/>
<contactref element="VCA1" pad="13"/>
</signal>
<signal name="N$30">
<contactref element="IC1" pad="13"/>
</signal>
<signal name="N$13">
<contactref element="IC1" pad="9"/>
</signal>
<signal name="N$15">
<contactref element="R14" pad="1"/>
<contactref element="VOL1" pad="P$3"/>
</signal>
<signal name="N$16">
<contactref element="R15" pad="2"/>
<contactref element="VOL1" pad="P$1"/>
</signal>
<signal name="N$22">
<contactref element="R24" pad="1"/>
<contactref element="VOL2" pad="P$3"/>
</signal>
<signal name="N$28">
<contactref element="R25" pad="2"/>
<contactref element="VOL2" pad="P$1"/>
</signal>
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