<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.6.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="61.265" y2="0" width="0" layer="20"/>
<wire x1="61.265" y1="0" x2="61.265" y2="25.39" width="0" layer="20"/>
<wire x1="61.265" y1="25.39" x2="0" y2="25.39" width="0" layer="20"/>
<wire x1="0" y1="25.39" x2="0" y2="0" width="0" layer="20"/>
</plain>
<libraries>
<library name="Daniel">
<packages>
<package name="BATTERY-A23">
<description>Battery holder for A23 (12V) batteries</description>
</package>
<package name="SPDT-SWITCH">
</package>
</packages>
</library>
<library name="rcl">
<packages>
<package name="E2,5-5">
<description>&lt;b&gt;ELECTROLYTIC CAPACITOR&lt;/b&gt;&lt;p&gt;
grid 2.54 mm, diameter 5 mm</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="DIL08">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="adafruit">
<packages>
<package name="TRIM-3386">
</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; 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="1X05_LOCK">
</package>
</packages>
</library>
<library name="CMU-ArtFab">
<packages>
<package name="0204V">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;p&gt;
type 0204, grid 2.5 mm</description>
</package>
<package name="TO92-">
<description>&lt;b&gt;TO 92 pad in line&lt;/b&gt;</description>
</package>
<package name="1/8&quot;-F-STEREO-PCB">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="BAT1" library="Daniel" package="BATTERY-A23" value=""/>
<element name="C1" library="rcl" package="E2,5-5" value="10u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C3" library="rcl" package="E2,5-5" value="0.1u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C4" library="rcl" package="E2,5-5" value="10u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="IC1" library="linear" package="DIL08" value="OPA2134PA">
<attribute name="IC_NAME" value="TL072"/>
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="JP1" library="SparkFun-Connectors" package="1X05_LOCK" value="">
<attribute name="CON1" value="Vin"/>
<attribute name="CON2" value="3V"/>
<attribute name="CON3" value="GND"/>
<attribute name="CON4" value="AC"/>
<attribute name="CON5" value="DC"/>
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="ON/OFF" library="Daniel" package="SPDT-SWITCH" value="labl"/>
<element name="R1" library="CMU-ArtFab" package="0204V" value="1K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R2" library="CMU-ArtFab" package="0204V" value="100K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R3" library="CMU-ArtFab" package="0204V" value="10">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R5" library="CMU-ArtFab" package="0204V" value="47K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R4" library="CMU-ArtFab" package="0204V" value="47K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R6" library="adafruit" package="TRIM-3386" value="10K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C2" library="rcl" package="E2,5-5" value="100u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="IC3" library="CMU-ArtFab" package="TO92-" value="78">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="JP2" library="SparkFun-Connectors" package="1X05_LOCK" value="">
<attribute name="CON1" value="Vin"/>
<attribute name="CON2" value="3V"/>
<attribute name="CON3" value="GND"/>
<attribute name="CON4" value="AC"/>
<attribute name="CON5" value="DC"/>
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C5" library="rcl" package="E2,5-5" value="10u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R7" library="CMU-ArtFab" package="0204V" value="1K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R8" library="CMU-ArtFab" package="0204V" value="100K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C6" library="rcl" package="E2,5-5" value="10u">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R9" library="adafruit" package="TRIM-3386" value="10K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="U$1" library="CMU-ArtFab" package="1/8&quot;-F-STEREO-PCB" value="1/8&quot;-F-STEREO-PCB"/>
</elements>
<signals>
<signal name="GND">
<contactref element="C3" pad="-"/>
<contactref element="R4" pad="1"/>
<contactref element="IC1" pad="4"/>
<contactref element="JP1" pad="3"/>
<contactref element="ON/OFF" pad="2"/>
<contactref element="R6" pad="1"/>
<contactref element="C2" pad="-"/>
<contactref element="IC3" pad="2"/>
<contactref element="JP2" pad="3"/>
<contactref element="R9" pad="1"/>
<contactref element="U$1" pad="SLEEVE2"/>
<contactref element="U$1" pad="SLEEVE1"/>
</signal>
<signal name="N$8">
<contactref element="C3" pad="+"/>
<contactref element="R5" pad="1"/>
<contactref element="R4" pad="2"/>
<contactref element="IC1" pad="3"/>
<contactref element="IC1" pad="5"/>
</signal>
<signal name="N$2">
<contactref element="BAT1" pad="GND@1"/>
<contactref element="ON/OFF" pad="1"/>
</signal>
<signal name="N$3">
<contactref element="JP1" pad="4"/>
<contactref element="C4" pad="+"/>
</signal>
<signal name="N$4">
<contactref element="C4" pad="-"/>
<contactref element="R1" pad="1"/>
</signal>
<signal name="N$5">
<contactref element="R2" pad="1"/>
<contactref element="R1" pad="2"/>
<contactref element="IC1" pad="2"/>
</signal>
<signal name="VBAT">
<contactref element="BAT1" pad="PWR@1"/>
<contactref element="R3" pad="2"/>
<contactref element="R5" pad="2"/>
<contactref element="IC3" pad="1"/>
</signal>
<signal name="+5V">
<contactref element="JP1" pad="1"/>
<contactref element="IC3" pad="3"/>
<contactref element="JP2" pad="1"/>
</signal>
<signal name="N$9">
<contactref element="R2" pad="2"/>
<contactref element="IC1" pad="1"/>
<contactref element="C1" pad="+"/>
</signal>
<signal name="N$1">
<contactref element="R3" pad="1"/>
<contactref element="IC1" pad="8"/>
<contactref element="C2" pad="+"/>
</signal>
<signal name="N$6">
<contactref element="C1" pad="-"/>
<contactref element="R6" pad="3"/>
</signal>
<signal name="N$7">
<contactref element="R6" pad="2"/>
<contactref element="U$1" pad="TIP1"/>
<contactref element="U$1" pad="TIP2"/>
</signal>
<signal name="N$10">
<contactref element="JP2" pad="4"/>
<contactref element="C5" pad="+"/>
</signal>
<signal name="N$11">
<contactref element="C5" pad="-"/>
<contactref element="R7" pad="1"/>
</signal>
<signal name="N$12">
<contactref element="R7" pad="2"/>
<contactref element="IC1" pad="6"/>
<contactref element="R8" pad="1"/>
</signal>
<signal name="N$13">
<contactref element="C6" pad="+"/>
<contactref element="IC1" pad="7"/>
<contactref element="R8" pad="2"/>
</signal>
<signal name="N$14">
<contactref element="C6" pad="-"/>
<contactref element="R9" pad="3"/>
</signal>
<signal name="N$15">
<contactref element="R9" pad="2"/>
<contactref element="U$1" pad="RING"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
