<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.2.0">
<drawing>
<board>
<plain>
<wire x1="-1.27" y1="3.81" x2="52.07" y2="3.81" width="0" layer="20"/>
<wire x1="52.07" y1="3.81" x2="52.07" y2="46.99" width="0" layer="20"/>
<wire x1="52.07" y1="46.99" x2="-1.27" y2="46.99" width="0" layer="20"/>
<wire x1="-1.27" y1="46.99" x2="-1.27" y2="3.81" width="0" layer="20"/>
<text>VCC</text>
<text>GND</text>
<text>LEFT INPUT</text>
<text>RIGHT INPUT</text>
<text>LEFT</text>
<text>RIGHT</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="DIL14">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="capacitor-wima">
<description>&lt;b&gt;WIMA Capacitors&lt;/b&gt;&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="C2.5-2">
<description>&lt;B&gt;MKS2&lt;/B&gt;, 5 x 2.5 mm, grid 2.54 mm</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>
</packages>
</library>
<library name="diode">
<description>&lt;b&gt;Diodes&lt;/b&gt;&lt;p&gt;
Based on the following sources:
&lt;ul&gt;
&lt;li&gt;Motorola : www.onsemi.com
&lt;li&gt;Fairchild : www.fairchildsemi.com
&lt;li&gt;Philips : www.semiconductors.com
&lt;li&gt;Vishay : www.vishay.de
&lt;/ul&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="D-5">
<description>&lt;b&gt;DIODE&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="holes">
<description>&lt;b&gt;Mounting Holes and Pads&lt;/b&gt;&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="2,8">
<description>&lt;b&gt;MOUNTING HOLE&lt;/b&gt; 2.8 mm with drill center</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="CT6">
<description>&lt;b&gt;POTENTIOMETER&lt;/b&gt;&lt;p&gt;
Copal</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="RCA">
</package>
<package name="1X06">
</package>
</packages>
</library>
<library name="Cort-Library">
<packages>
<package name="AXIAL-0.3">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="ICR" library="linear" package="DIL14" value="MCP6004">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C1" library="capacitor-wima" package="C2.5-2" value="1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C2" library="capacitor-wima" package="C2.5-2" value="1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R1" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R11" library="SparkFun" package="AXIAL-0.3" value="VAR">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R10" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R9" library="SparkFun" package="AXIAL-0.3" value="2k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R23" library="SparkFun" package="AXIAL-0.3" value="100k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R24" library="SparkFun" package="AXIAL-0.3" value="100k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R3" library="SparkFun" package="AXIAL-0.3" value="100k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R2" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R5" library="SparkFun" package="AXIAL-0.3" value="150k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R4" library="SparkFun" package="AXIAL-0.3" value="50k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R8" library="SparkFun" package="AXIAL-0.3" value="2k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R7" library="SparkFun" package="AXIAL-0.3" value="39k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R6" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="D1" library="diode" package="D-5" value="1N914">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="H1" library="holes" package="2,8" value="MOUNT-HOLE2.8"/>
<element name="H2" library="holes" package="2,8" value="MOUNT-HOLE2.8"/>
<element name="H3" library="holes" package="2,8" value="MOUNT-HOLE2.8"/>
<element name="H4" library="holes" package="2,8" value="MOUNT-HOLE2.8"/>
<element name="RIGHT_TRIM" library="pot" package="CT6" value="100k-200k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="ICL" library="linear" package="DIL14" value="MCP6004">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C5" library="capacitor-wima" package="C2.5-2" value="1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C6" library="capacitor-wima" package="C2.5-2" value="1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R12" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R22" library="SparkFun" package="AXIAL-0.3" value="VAR">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R21" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R20" library="SparkFun" package="AXIAL-0.3" value="2k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R14" library="SparkFun" package="AXIAL-0.3" value="100k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R13" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R16" library="SparkFun" package="AXIAL-0.3" value="150k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R15" library="SparkFun" package="AXIAL-0.3" value="50k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R19" library="SparkFun" package="AXIAL-0.3" value="2k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R18" library="SparkFun" package="AXIAL-0.3" value="39k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R17" library="SparkFun" package="AXIAL-0.3" value="10k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="D2" library="diode" package="D-5" value="1N914">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="LEFT_TRIM" library="pot" package="CT6" value="100k-250k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="RIGHT" library="SparkFun-Connectors" package="RCA" value="RCA_R"/>
<element name="LEFT" library="SparkFun-Connectors" package="RCA" value="RCA_L"/>
<element name="JP1" library="SparkFun-Connectors" package="1X06" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C3" library="capacitor-wima" package="C2.5-2" value=".1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C4" library="capacitor-wima" package="C2.5-2" value=".1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C7" library="capacitor-wima" package="C2.5-2" value=".1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C8" library="capacitor-wima" package="C2.5-2" value=".1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="L1" library="Cort-Library" package="AXIAL-0.3" value="Ferrite Bead">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C9" library="capacitor-wima" package="C2.5-2" value=".1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="N$2">
<contactref element="C1" pad="2"/>
<contactref element="R1" pad="P$1"/>
</signal>
<signal name="IN_L">
<contactref element="C1" pad="1"/>
<contactref element="RIGHT" pad="PIN"/>
</signal>
<signal name="N$5">
<contactref element="R1" pad="P$2"/>
<contactref element="ICR" pad="2"/>
<contactref element="RIGHT_TRIM" pad="E"/>
<contactref element="RIGHT_TRIM" pad="S"/>
</signal>
<signal name="N$7">
<contactref element="ICR" pad="1"/>
<contactref element="C2" pad="1"/>
<contactref element="RIGHT_TRIM" pad="A"/>
</signal>
<signal name="VCC">
<contactref element="ICR" pad="4"/>
<contactref element="R23" pad="P$2"/>
<contactref element="ICL" pad="4"/>
<contactref element="L1" pad="P$1"/>
<contactref element="C9" pad="1"/>
</signal>
<signal name="GND">
<contactref element="R24" pad="P$1"/>
<contactref element="ICR" pad="11"/>
<contactref element="R2" pad="P$1"/>
<contactref element="R6" pad="P$1"/>
<contactref element="R10" pad="P$1"/>
<contactref element="R5" pad="P$1"/>
<contactref element="ICR" pad="5"/>
<contactref element="R17" pad="P$1"/>
<contactref element="R21" pad="P$1"/>
<contactref element="R16" pad="P$1"/>
<contactref element="ICL" pad="5"/>
<contactref element="R13" pad="P$1"/>
<contactref element="ICL" pad="11"/>
<contactref element="LEFT" pad="SHELL"/>
<contactref element="LEFT" pad="SWITCH"/>
<contactref element="RIGHT" pad="SHELL"/>
<contactref element="RIGHT" pad="SWITCH"/>
<contactref element="JP1" pad="6"/>
<contactref element="C3" pad="2"/>
<contactref element="C4" pad="2"/>
<contactref element="C7" pad="2"/>
<contactref element="C8" pad="2"/>
<contactref element="C9" pad="2"/>
</signal>
<signal name="N$6">
<contactref element="C2" pad="2"/>
<contactref element="R3" pad="P$2"/>
<contactref element="R2" pad="P$2"/>
</signal>
<signal name="N$9">
<contactref element="R4" pad="P$1"/>
<contactref element="R3" pad="P$1"/>
<contactref element="ICR" pad="6"/>
</signal>
<signal name="N$12">
<contactref element="R6" pad="P$2"/>
<contactref element="R7" pad="P$1"/>
<contactref element="ICR" pad="9"/>
</signal>
<signal name="N$11">
<contactref element="R7" pad="P$2"/>
<contactref element="ICR" pad="8"/>
<contactref element="R8" pad="P$2"/>
</signal>
<signal name="N$13">
<contactref element="ICR" pad="7"/>
<contactref element="D1" pad="A"/>
</signal>
<signal name="N$10">
<contactref element="R4" pad="P$2"/>
<contactref element="D1" pad="C"/>
<contactref element="R5" pad="P$2"/>
<contactref element="ICR" pad="10"/>
</signal>
<signal name="N$16">
<contactref element="R10" pad="P$2"/>
<contactref element="R11" pad="P$1"/>
<contactref element="ICR" pad="13"/>
</signal>
<signal name="N$15">
<contactref element="ICR" pad="12"/>
<contactref element="R9" pad="P$1"/>
<contactref element="C4" pad="1"/>
</signal>
<signal name=".5VCC">
<contactref element="R24" pad="P$2"/>
<contactref element="R23" pad="P$1"/>
<contactref element="ICR" pad="3"/>
<contactref element="ICL" pad="3"/>
</signal>
<signal name="N$1">
<contactref element="C5" pad="2"/>
<contactref element="R12" pad="P$1"/>
</signal>
<signal name="IN_R">
<contactref element="C5" pad="1"/>
<contactref element="LEFT" pad="PIN"/>
</signal>
<signal name="N$8">
<contactref element="R12" pad="P$2"/>
<contactref element="ICL" pad="2"/>
<contactref element="LEFT_TRIM" pad="E"/>
<contactref element="LEFT_TRIM" pad="S"/>
</signal>
<signal name="N$18">
<contactref element="ICL" pad="1"/>
<contactref element="C6" pad="1"/>
<contactref element="LEFT_TRIM" pad="A"/>
</signal>
<signal name="N$19">
<contactref element="C6" pad="2"/>
<contactref element="R14" pad="P$2"/>
<contactref element="R13" pad="P$2"/>
</signal>
<signal name="N$20">
<contactref element="R15" pad="P$1"/>
<contactref element="R14" pad="P$1"/>
<contactref element="ICL" pad="6"/>
</signal>
<signal name="N$21">
<contactref element="R17" pad="P$2"/>
<contactref element="R18" pad="P$1"/>
<contactref element="ICL" pad="9"/>
</signal>
<signal name="N$22">
<contactref element="R18" pad="P$2"/>
<contactref element="ICL" pad="8"/>
<contactref element="R19" pad="P$2"/>
</signal>
<signal name="N$23">
<contactref element="ICL" pad="7"/>
<contactref element="D2" pad="A"/>
</signal>
<signal name="N$24">
<contactref element="R15" pad="P$2"/>
<contactref element="D2" pad="C"/>
<contactref element="R16" pad="P$2"/>
<contactref element="ICL" pad="10"/>
</signal>
<signal name="N$26">
<contactref element="R21" pad="P$2"/>
<contactref element="R22" pad="P$1"/>
<contactref element="ICL" pad="13"/>
</signal>
<signal name="N$28">
<contactref element="ICL" pad="12"/>
<contactref element="R20" pad="P$1"/>
<contactref element="C8" pad="1"/>
</signal>
<signal name="L_OUT">
<contactref element="JP1" pad="3"/>
<contactref element="ICL" pad="14"/>
<contactref element="R22" pad="P$2"/>
</signal>
<signal name="R_OUT">
<contactref element="JP1" pad="4"/>
<contactref element="R11" pad="P$2"/>
<contactref element="ICR" pad="14"/>
</signal>
<signal name="R_RECT">
<contactref element="JP1" pad="5"/>
<contactref element="R8" pad="P$1"/>
<contactref element="C3" pad="1"/>
<contactref element="R9" pad="P$2"/>
</signal>
<signal name="N$3">
<contactref element="JP1" pad="1"/>
<contactref element="L1" pad="P$2"/>
</signal>
<signal name="L_RECT">
<contactref element="R20" pad="P$2"/>
<contactref element="C7" pad="1"/>
<contactref element="R19" pad="P$1"/>
<contactref element="JP1" pad="2"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
