<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.7.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="28.88" x2="0" y2="0.635" width="0" layer="20"/>
<wire x1="0" y1="0.635" x2="0.635" y2="0" width="0" layer="20" curve="90"/>
<wire x1="0.635" y1="0" x2="28.555" y2="0" width="0" layer="20"/>
<wire x1="28.555" y1="0" x2="29.19" y2="0.635" width="0" layer="20" curve="90"/>
<wire x1="29.19" y1="0.635" x2="29.19" y2="28.88" width="0" layer="20"/>
<wire x1="29.19" y1="28.88" x2="28.555" y2="29.515" width="0" layer="20" curve="90"/>
<wire x1="28.555" y1="29.515" x2="0.635" y2="29.515" width="0" layer="20"/>
<wire x1="0.635" y1="29.515" x2="0" y2="28.88" width="0" layer="20" curve="90"/>
<text>External</text>
<text>GLC 2019</text>
<text>Wien Bridge Oscilator</text>
<text>HPV</text>
<text>Freq Adj</text>
<text>Open Hardware</text>
<text>Wien Bridge Oscillator</text>
<text>1000 Hz</text>
<text>Rev. 1.1</text>
<text>Greg Christenson
2019</text>
<text>External</text>
<text>P Freq Adj.</text>
<text>S Freq Adj.</text>
</plain>
<libraries>
<library name="wirepad">
<description>&lt;b&gt;Single Pads&lt;/b&gt;&lt;p&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="2,54/1,1">
<description>&lt;b&gt;THROUGH-HOLE PAD&lt;/b&gt;</description>
</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="1210">
</package>
<package name="EIA3216">
</package>
<package name="0805">
</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="3,2">
<description>&lt;b&gt;MOUNTING HOLE&lt;/b&gt; 3.2 mm with drill center</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="SOIC8">
<description>&lt;b&gt;SOIC-8&lt;/b&gt; CASE 751-07&lt;p&gt;
Source: http://www.onsemi.com/pub/Collateral/MC34164-D.PDF&lt;p&gt;
&lt;b&gt;D (R-PDSO-G8)&lt;/b&gt;PLATIC SMALL-OUTLINE PACKAGE&lt;br&gt;
Source: http://focus.ti.com/lit/ds/symlink/tlc27l2.pdf</description>
</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-NS">
<description>&lt;h3&gt;LED 3MM - No Silk&lt;/h3&gt;
3 mm, round</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="RJ9W">
<description>&lt;b&gt;POTENTIOMETER&lt;/b&gt;&lt;p&gt;
Copal</description>
</package>
</packages>
</library>
<library name="SparkFun-Resistors">
<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="1206">
</package>
</packages>
</library>
<library name="SparkFun-Aesthetics">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find non-functional items- supply symbols, logos, notations, frame blocks, 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="OSHW-LOGO-S">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="15+" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="15-" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C1" library="SparkFun-Capacitors" package="1210" value="0.1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C2" library="SparkFun-Capacitors" package="1210" value="0.1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C4" library="SparkFun-Capacitors" package="EIA3216" value="4.7uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C5" library="SparkFun-Capacitors" package="EIA3216" value="4.7uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C6" library="SparkFun-Capacitors" package="0805" value="0.1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C7" library="SparkFun-Capacitors" package="0805" value="0.1uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="GND" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="H1" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="H2" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="IC1" library="linear" package="SOIC8" value="OPA1612">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="L1" library="SparkFun-LED" package="LED3MM-NS" value="7646">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="L2" library="SparkFun-LED" package="LED3MM-NS" value="7646">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R1" library="pot" package="RJ9W" value="500">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R2" library="pot" package="RJ9W" value="200">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R3" library="pot" package="RJ9W" value="200">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R4" library="SparkFun-Resistors" package="1206" value="1.5K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R5" library="SparkFun-Resistors" package="1206" value="1.5K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R6" library="SparkFun-Resistors" package="1206" value="10K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R7" library="SparkFun-Resistors" package="1206" value="100K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SGND" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SOUT" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="VR4" library="pot" package="RJ9W" value="10K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="G1" library="wirepad" package="2,54/1,1" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="U$1" library="SparkFun-Aesthetics" package="OSHW-LOGO-S" value=""/>
<element name="U$2" library="SparkFun-Aesthetics" package="OSHW-LOGO-S" value=""/>
</elements>
<signals>
<signal name="GND">
<contactref element="L1" pad="K"/>
<contactref element="R4" pad="1"/>
<contactref element="C1" pad="1"/>
<contactref element="VR4" pad="A"/>
<contactref element="IC1" pad="3"/>
<contactref element="GND" pad="1"/>
<contactref element="C4" pad="C"/>
<contactref element="C5" pad="A"/>
<contactref element="C6" pad="2"/>
<contactref element="C7" pad="1"/>
<contactref element="SGND" pad="1"/>
<contactref element="G1" pad="1"/>
</signal>
<signal name="N$2">
<contactref element="C1" pad="2"/>
<contactref element="IC1" pad="5"/>
<contactref element="R2" pad="A"/>
<contactref element="R3" pad="A"/>
<contactref element="R3" pad="S"/>
</signal>
<signal name="N$4">
<contactref element="R1" pad="E"/>
<contactref element="R1" pad="S"/>
<contactref element="IC1" pad="6"/>
<contactref element="L2" pad="A"/>
</signal>
<signal name="N$5">
<contactref element="R1" pad="A"/>
<contactref element="VR4" pad="E"/>
<contactref element="IC1" pad="7"/>
<contactref element="C2" pad="2"/>
</signal>
<signal name="N$10">
<contactref element="VR4" pad="S"/>
<contactref element="R6" pad="1"/>
</signal>
<signal name="N$11">
<contactref element="R6" pad="2"/>
<contactref element="R7" pad="1"/>
<contactref element="IC1" pad="2"/>
</signal>
<signal name="N$24">
<contactref element="R7" pad="2"/>
<contactref element="IC1" pad="1"/>
<contactref element="SOUT" pad="1"/>
</signal>
<signal name="VCC+">
<contactref element="15+" pad="1"/>
<contactref element="C4" pad="A"/>
<contactref element="C6" pad="1"/>
<contactref element="IC1" pad="8"/>
</signal>
<signal name="VCC-">
<contactref element="15-" pad="1"/>
<contactref element="C5" pad="C"/>
<contactref element="C7" pad="2"/>
<contactref element="IC1" pad="4"/>
</signal>
<signal name="N$1">
<contactref element="L1" pad="A"/>
<contactref element="L2" pad="K"/>
</signal>
<signal name="N$3">
<contactref element="R4" pad="2"/>
<contactref element="R2" pad="E"/>
<contactref element="R2" pad="S"/>
</signal>
<signal name="N$6">
<contactref element="R3" pad="E"/>
<contactref element="R5" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="R5" pad="2"/>
<contactref element="C2" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
