<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="9.1.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="33" y2="0" width="0" layer="20"/>
<wire x1="33" y1="0" x2="33" y2="27.865" width="0" layer="20"/>
<wire x1="33" y1="27.865" x2="0" y2="27.865" width="0" layer="20"/>
<wire x1="0" y1="27.865" x2="0" y2="0" width="0" layer="20"/>
<text>Tuning Fork
TIA, rev 4.3
Jan 2019
EZ grp WIS</text>
<text>1</text>
<text>Rf~10MOhm</text>
<text>-12V</text>
<text>+12V</text>
<text>GND</text>
<text>IN</text>
<text>OUT</text>
</plain>
<libraries>
<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="3,0-PAD">
<description>&lt;b&gt;MOUNTING PAD&lt;/b&gt; 3.0 mm, round</description>
</package>
</packages>
</library>
<library name="Aviram">
<packages>
<package name="POWER-SUPP-0.1''-3POINT-0282834-3">
</package>
<package name="POWER-SUPP-0.1''-2POINT-0282834-2">
</package>
</packages>
</library>
<library name="Texas Instruments_By_element14_Batch_1">
<description>Developed by element14 :&lt;br&gt;
element14 CAD Library consolidation.ulp
at 30/07/2012 17:45:58</description>
<packages>
<package name="SOT95P280X145-5N">
</package>
</packages>
</library>
<library name="SparkFun-PowerIC">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find drivers, regulators, and amplifiers.&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="SOT223">
<description>&lt;b&gt;SOT-223&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="LTC_By_element14_Batch_1">
<description>Developed by element14 :&lt;br&gt;
element14 CAD Library consolidation.ulp
at 30/07/2012 10:08:22</description>
<packages>
<package name="SOT95P280X100-5N">
</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>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="C1" library="SparkFun-Capacitors" package="0603-CAP" value="0.1uF">
<attribute name="PROD_ID" value="CAP-08604"/>
<attribute name="VALUE" value="0.1uF"/>
</element>
<element name="C2" library="SparkFun-Capacitors" package="0603-CAP" value="10uF">
<attribute name="PROD_ID" value="CAP-11015"/>
<attribute name="VALUE" value="10uF"/>
</element>
<element name="C3" library="SparkFun-Capacitors" package="0603-CAP" value="0.1uF">
<attribute name="PROD_ID" value="CAP-08604"/>
<attribute name="VALUE" value="0.1uF"/>
</element>
<element name="C4" library="SparkFun-Capacitors" package="0603-CAP" value="10uF">
<attribute name="PROD_ID" value="CAP-11015"/>
<attribute name="VALUE" value="10uF"/>
</element>
<element name="H2" library="holes" package="3,0-PAD" value="MOUNT-PAD-ROUND3.0"/>
<element name="U1" library="Texas Instruments_By_element14_Batch_1" package="SOT95P280X145-5N" value="OPA657N/250">
<attribute name="MPN" value="OPA657N/250"/>
<attribute name="OC_FARNELL" value="1577159"/>
<attribute name="OC_NEWARK" value="75C5141"/>
<attribute name="PACKAGE" value="SOT-23-5"/>
<attribute name="SUPPLIER" value="Texas Instruments"/>
<attribute name="VALUE"/>
</element>
<element name="POWER" library="Aviram" package="POWER-SUPP-0.1''-3POINT-0282834-3" value="POWER-SUPP-0.1''-3POINT-0282834-3"/>
<element name="SIGNAL" library="Aviram" package="POWER-SUPP-0.1''-2POINT-0282834-2" value="POWER-SUPP-0.1''-2POINT-0282834-2">
<attribute name="NAME"/>
</element>
<element name="-15V_TO_-5V" library="LTC_By_element14_Batch_1" package="SOT95P280X100-5N" value="LT1964ES5-5TRMPBF">
<attribute name="MPN" value="LT1964ES5-5#TRMPBF"/>
<attribute name="OC_FARNELL" value="1663814"/>
<attribute name="OC_NEWARK" value="59M8319"/>
<attribute name="PACKAGE" value="TSOT-23-5"/>
<attribute name="SUPPLIER" value="Linear Technology"/>
<attribute name="VALUE"/>
</element>
<element name="LT1521CST-5" library="SparkFun-PowerIC" package="SOT223" value="V_REG_MIC2920">
<attribute name="NAME"/>
</element>
<element name="C_BYP" library="SparkFun-Capacitors" package="0603-CAP" value="10 nF">
<attribute name="NAME"/>
<attribute name="PROD_ID" value="CAP-00867"/>
<attribute name="VALUE"/>
</element>
<element name="C_OUT" library="SparkFun-Capacitors" package="0603-CAP" value="10 uF">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C_FB" library="SparkFun-Capacitors" package="0603-CAP" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C5" library="SparkFun-Capacitors" package="0603-CAP" value="4.7uF">
<attribute name="NAME"/>
<attribute name="PROD_ID" value="CAP-08280"/>
<attribute name="VALUE"/>
</element>
<element name="C6" library="SparkFun-Capacitors" package="0603-CAP" value="4.7uF">
<attribute name="NAME"/>
<attribute name="PROD_ID" value="CAP-08280"/>
<attribute name="VALUE"/>
</element>
<element name="H1" library="holes" package="3,0-PAD" value="MOUNT-PAD-ROUND3.0"/>
<element name="C7" library="SparkFun-Capacitors" package="0603-CAP" value="1uF">
<attribute name="NAME"/>
<attribute name="PROD_ID" value="CAP-08280"/>
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="+VS">
<contactref element="C1" pad="2"/>
<contactref element="C2" pad="2"/>
<contactref element="U1" pad="5"/>
<contactref element="LT1521CST-5" pad="3"/>
<contactref element="C6" pad="1"/>
</signal>
<signal name="-VS">
<contactref element="C3" pad="1"/>
<contactref element="C4" pad="1"/>
<contactref element="U1" pad="2"/>
<contactref element="C_BYP" pad="2"/>
<contactref element="-15V_TO_-5V" pad="5"/>
<contactref element="C_OUT" pad="1"/>
</signal>
<signal name="GND">
<contactref element="C4" pad="2"/>
<contactref element="C1" pad="1"/>
<contactref element="C2" pad="1"/>
<contactref element="-15V_TO_-5V" pad="1"/>
<contactref element="LT1521CST-5" pad="2"/>
<contactref element="POWER" pad="P$2"/>
<contactref element="C3" pad="2"/>
<contactref element="U1" pad="3"/>
<contactref element="C_OUT" pad="2"/>
<contactref element="C6" pad="2"/>
<contactref element="C5" pad="2"/>
<contactref element="H1" pad="B3,0"/>
<contactref element="H2" pad="B3,0"/>
<contactref element="C7" pad="1"/>
</signal>
<signal name="VIN-">
<contactref element="U1" pad="4"/>
<contactref element="C_FB" pad="2"/>
<contactref element="SIGNAL" pad="P$2"/>
</signal>
<signal name="VOUT">
<contactref element="U1" pad="1"/>
<contactref element="SIGNAL" pad="P$1"/>
<contactref element="C_FB" pad="1"/>
</signal>
<signal name="N$3">
<contactref element="-15V_TO_-5V" pad="3"/>
<contactref element="C_BYP" pad="1"/>
</signal>
<signal name="-15V">
<contactref element="-15V_TO_-5V" pad="4"/>
<contactref element="-15V_TO_-5V" pad="2"/>
<contactref element="POWER" pad="P$3"/>
<contactref element="C7" pad="2"/>
</signal>
<signal name="+15V">
<contactref element="LT1521CST-5" pad="1"/>
<contactref element="POWER" pad="P$1"/>
<contactref element="C5" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
