<?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="7.62" x2="45.72" y2="7.62" width="0" layer="20"/>
<wire x1="45.72" y1="83.81" x2="-1.27" y2="83.81" width="0" layer="20"/>
<wire x1="-1.27" y1="83.81" x2="-1.27" y2="7.62" width="0" layer="20"/>
<hole x="42.545" y="10.16" drill="3"/>
<hole x="1.27" y="10.16" drill="3"/>
<hole x="1.27" y="81.28" drill="3"/>
<hole x="43.18" y="81.28" drill="3"/>
<wire x1="45.72" y1="83.81" x2="45.72" y2="7.62" width="0" layer="20"/>
<text>S1 Phantom</text>
<text>S3 Pad</text>
<text>S4 Phase</text>
<text>S2 Impedence</text>
<text>LED GND</text>
<text>LED V+</text>
<text>48v GND</text>
<text>48v GND</text>
<text>Pin 2</text>
<text>Pin 3</text>
<text>Mic Preamp Front End PCB Rev #1
based on Jensen AS016
straypacket / 20150326</text>
</plain>
<libraries>
<library name="c-k-switches">
<packages>
<package name="F2UEE">
</package>
</packages>
</library>
<library name="gm-resistors">
<description>&lt;b&gt;Resistors&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;6mm long -- the size of 1/4 watt resistors
&lt;li&gt; all resistor values have the same size package; you choose the value of resistance 
&lt;/ul&gt;</description>
<packages>
<package name="0703">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;br&gt;
&lt;br&gt;
length: 7.5mm&lt;br&gt;
format: 0.1" (perfboard)&lt;br&gt;
spacing: 3 holes

&lt;p&gt;This length resistor applies to 1/2 watt metal film.</description>
</package>
</packages>
</library>
<library name="gm-caps-electro-pol">
<description>&lt;b&gt;Capacitors, Polar Electrolytic, Radial &lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;large value capacitors: .22 - 470uF (uF = ÃÂÃÂµF = mF)
&lt;li&gt;often used in power supply filters
&lt;/ul&gt;</description>
<packages>
<package name="063_025_2">
<description>&lt;b&gt;6.3mm diameter, 2.5mm lead spacing, 0.2" pad spacing&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun">
<description>Spark Fun Electronics' preferred foot prints. &lt;b&gt;Not to be used for commercial purposes.&lt;/b&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.</description>
<packages>
<package name="MOLEX-1X4_LOCK">
</package>
<package name="1X02_LOCK_LONGPADS">
<description>This footprint was designed to help hold the alignment of a through-hole component (i.e.  6-pin header) while soldering it into place.  
You may notice that each hole has been shifted either up or down by 0.005 of an inch from it's more standard position (which is a perfectly straight line).  
This slight alteration caused the pins (the squares in the middle) to touch the edges of the holes.  Because they are alternating, it causes a "brace" 
to hold the component in place.  0.005 has proven to be the perfect amount of "off-center" position when using our standard breakaway headers.
Although looks a little odd when you look at the bare footprint, once you have a header in there, the alteration is very hard to notice.  Also,
if you push a header all the way into place, it is covered up entirely on the bottom side.  This idea of altering the position of holes to aid alignment 
will be further integrated into the Sparkfun Library for other footprints.  It can help hold any component with 3 or more connection pins.</description>
</package>
<package name="LED5MM">
<description>&lt;B&gt;LED&lt;/B&gt;&lt;p&gt;
5 mm, round</description>
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="S1" library="c-k-switches" package="F2UEE" value="CKF2UEE"/>
<element name="S3" library="c-k-switches" package="F2UEE" value="CKF2UEE"/>
<element name="S4" library="c-k-switches" package="F2UEE" value="CKF2UEE"/>
<element name="S2" library="c-k-switches" package="F2UEE" value="CKF2UEE"/>
<element name="R1" library="gm-resistors" package="0703" value="200">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="C1" library="gm-caps-electro-pol" package="063_025_2" value="220uF 63v">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R2" library="gm-resistors" package="0703" value="6k81">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R3" library="gm-resistors" package="0703" value="6k81">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="JP1" library="SparkFun" package="MOLEX-1X4_LOCK" value=""/>
<element name="SIGIN" library="SparkFun" package="1X02_LOCK_LONGPADS" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SIGOUT" library="SparkFun" package="1X02_LOCK_LONGPADS" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R4" library="gm-resistors" package="0703" value="68r1">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R5" library="gm-resistors" package="0703" value="68r1">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R6" library="gm-resistors" package="0703" value="169">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R7" library="gm-resistors" package="0703" value="619">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R8" library="gm-resistors" package="0703" value="619">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="R9" library="gm-resistors" package="0703" value="1k">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="LED1" library="SparkFun" package="LED5MM" value="">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="GND">
<contactref element="JP1" pad="3"/>
<contactref element="S1" pad="5"/>
<contactref element="C1" pad="-"/>
</signal>
<signal name="AGND">
<contactref element="JP1" pad="1"/>
<contactref element="S1" pad="6"/>
<contactref element="LED1" pad="K"/>
</signal>
<signal name="N$2">
<contactref element="JP1" pad="4"/>
<contactref element="S1" pad="1"/>
</signal>
<signal name="N$1">
<contactref element="JP1" pad="2"/>
<contactref element="S1" pad="2"/>
</signal>
<signal name="N$3">
<contactref element="S1" pad="3"/>
<contactref element="R1" pad="1"/>
</signal>
<signal name="N$4">
<contactref element="R1" pad="2"/>
<contactref element="C1" pad="+"/>
<contactref element="R2" pad="2"/>
<contactref element="R3" pad="1"/>
</signal>
<signal name="N$5">
<contactref element="S1" pad="4"/>
<contactref element="R9" pad="2"/>
</signal>
<signal name="N$6">
<contactref element="R9" pad="1"/>
<contactref element="LED1" pad="A"/>
</signal>
<signal name="N$7">
<contactref element="R2" pad="1"/>
<contactref element="SIGIN" pad="1"/>
<contactref element="S2" pad="1"/>
<contactref element="R4" pad="1"/>
</signal>
<signal name="N$8">
<contactref element="R3" pad="2"/>
<contactref element="S2" pad="2"/>
<contactref element="SIGIN" pad="2"/>
<contactref element="R5" pad="1"/>
</signal>
<signal name="N$9">
<contactref element="S2" pad="3"/>
<contactref element="R4" pad="2"/>
<contactref element="S3" pad="1"/>
<contactref element="R7" pad="1"/>
</signal>
<signal name="N$10">
<contactref element="S3" pad="2"/>
<contactref element="R8" pad="1"/>
<contactref element="R5" pad="2"/>
<contactref element="S2" pad="4"/>
</signal>
<signal name="N$11">
<contactref element="S3" pad="3"/>
<contactref element="R7" pad="2"/>
<contactref element="S4" pad="1"/>
<contactref element="S4" pad="6"/>
</signal>
<signal name="N$12">
<contactref element="S3" pad="4"/>
<contactref element="R8" pad="2"/>
<contactref element="S4" pad="2"/>
<contactref element="S4" pad="5"/>
</signal>
<signal name="N$16">
<contactref element="S4" pad="3"/>
<contactref element="SIGOUT" pad="1"/>
</signal>
<signal name="N$17">
<contactref element="S4" pad="4"/>
<contactref element="SIGOUT" pad="2"/>
</signal>
<signal name="N$13">
<contactref element="S3" pad="5"/>
<contactref element="R6" pad="2"/>
</signal>
<signal name="N$14">
<contactref element="S3" pad="6"/>
<contactref element="R6" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
