<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="6.5.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="64.44" y2="0" width="0" layer="20"/>
<wire x1="64.44" y1="0" x2="64.44" y2="34.28" width="0" layer="20"/>
<wire x1="64.44" y1="34.28" x2="0" y2="34.28" width="0" layer="20"/>
<wire x1="0" y1="34.28" x2="0" y2="0" width="0" layer="20"/>
<hole x="13.6525" y="32.385" drill="1.6"/>
<text>OUT</text>
<text>CounterBoard 1.1</text>
<text>23 NOV 2016</text>
<hole x="63.02375" y="32.385" drill="1.6"/>
<hole x="18.89125" y="6.985" drill="1.6"/>
<text>INPUT
+/-</text>
</plain>
<libraries>
<library name="74xx-eu">
<description>&lt;b&gt;TTL Devices, 74xx Series with European Symbols&lt;/b&gt;&lt;p&gt;
Based on the following sources:
&lt;ul&gt;
&lt;li&gt;Texas Instruments &lt;i&gt;TTL Data Book&lt;/i&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;Volume 1, 1996.
&lt;li&gt;TTL Data Book, Volume 2 , 1993
&lt;li&gt;National Seminconductor Databook 1990, ALS/LS Logic
&lt;li&gt;ttl 74er digital data dictionary, ECA Electronic + Acustic GmbH, ISBN 3-88109-032-0
&lt;li&gt;http://icmaster.com/ViewCompare.asp
&lt;/ul&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="DIL20">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
<package name="DIL24-6">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt; 0.6 inch</description>
</package>
</packages>
</library>
<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="1,6/0,9">
<description>&lt;b&gt;THROUGH-HOLE PAD&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="40xx">
<description>&lt;b&gt;CMOS Logic Devices, 4000 Series&lt;/b&gt;&lt;p&gt;
Based on the following sources:
&lt;ul&gt;
&lt;li&gt;Motorola &lt;i&gt;CMOS LOGIC DATA&lt;/i&gt;; book, 02/88, DL131 REV 1
&lt;li&gt;http://www.elexp.com
&lt;li&gt;http://www.intersil.com
&lt;li&gt;http://www.ls3c.com.tw/product/1/COMOS.html
&lt;/ul&gt;
&lt;author&gt;Created by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="DIL16">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-AnalogIC">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find all manner of analog ICs- DACs, ADCs, video chips, op-amps, and others.&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="DIP08">
<description>&lt;b&gt;Dual In Line&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-DiscreteSemi">
<description>&lt;h3&gt;SparkFun Electronics' preferred foot prints&lt;/h3&gt;
In this library you'll find discrete semiconductors- transistors, diodes, TRIACs, optoisolators, 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; 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="DIODE-1N4148">
</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; 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-0.4">
<description>1/4W Resistor, 0.4" wide&lt;p&gt;

Yageo CFR series &lt;a href="http://www.yageo.com/pdf/yageo/Leaded-R_CFR_2008.pdf"&gt;http://www.yageo.com/pdf/yageo/Leaded-R_CFR_2008.pdf&lt;/a&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-Passives">
<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; 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="1X03">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="IC2" library="74xx-eu" package="DIL20" value="74HCT273N">
<attribute name="VALUE"/>
</element>
<element name="IC3" library="74xx-eu" package="DIL20" value="74HCT273N">
<attribute name="VALUE"/>
</element>
<element name="12V" library="wirepad" package="1,6/0,9" value="+/- 12V">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="+5V" library="wirepad" package="1,6/0,9" value="5V">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="GND" library="wirepad" package="1,6/0,9" value="0V">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="IC1" library="40xx" package="DIL16" value="4040N">
<attribute name="VALUE"/>
</element>
<element name="IC4" library="74xx-eu" package="DIL24-6" value="74150N">
<attribute name="VALUE"/>
</element>
<element name="SEL1" library="wirepad" package="1,6/0,9" value="b0">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SEL2" library="wirepad" package="1,6/0,9" value="b1">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SEL3" library="wirepad" package="1,6/0,9" value="b2">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="SEL4" library="wirepad" package="1,6/0,9" value="b3">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="STRB" library="wirepad" package="1,6/0,9" value="Get">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="2" library="wirepad" package="1,6/0,9" value="Bit">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="U$1" library="SparkFun-AnalogIC" package="DIP08" value="LM358">
<attribute name="VALUE"/>
</element>
<element name="R1" library="SparkFun-Resistors" package="AXIAL-0.4" value="12k">
<attribute name="VALUE"/>
</element>
<element name="R2" library="SparkFun-Resistors" package="AXIAL-0.4" value="4.7k">
<attribute name="VALUE"/>
</element>
<element name="R3" library="SparkFun-Resistors" package="AXIAL-0.4" value="12k">
<attribute name="VALUE"/>
</element>
<element name="R4" library="SparkFun-Resistors" package="AXIAL-0.4" value="4.7k">
<attribute name="VALUE"/>
</element>
<element name="R5" library="SparkFun-Resistors" package="AXIAL-0.4" value="4.7k">
<attribute name="VALUE"/>
</element>
<element name="D1" library="SparkFun-DiscreteSemi" package="DIODE-1N4148" value="1N148">
<attribute name="VALUE"/>
</element>
<element name="CLK" library="wirepad" package="1,6/0,9" value="Latch">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="5V" library="wirepad" package="1,6/0,9" value="+/- 5V">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="JP1" library="SparkFun-Passives" package="1X03" value="JUMPER-3PTH">
<attribute name="NAME"/>
</element>
<element name="JP2" library="SparkFun-Passives" package="1X03" value="JUMPER-3PTH">
<attribute name="NAME"/>
</element>
<element name="1" library="wirepad" package="1,6/0,9" value="Bit">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
</elements>
<signals>
<signal name="VCC">
<contactref element="+5V" pad="1"/>
<contactref element="IC1" pad="16"/>
<contactref element="U$1" pad="8"/>
<contactref element="IC2" pad="1"/>
<contactref element="IC3" pad="1"/>
<contactref element="IC3" pad="20"/>
<contactref element="IC3" pad="20"/>
<contactref element="IC2" pad="20"/>
<contactref element="IC2" pad="20"/>
<contactref element="IC4" pad="24"/>
<contactref element="IC4" pad="24"/>
</signal>
<signal name="GND">
<contactref element="IC1" pad="8"/>
<contactref element="U$1" pad="4"/>
<contactref element="R2" pad="P$1"/>
<contactref element="R5" pad="P$1"/>
<contactref element="IC1" pad="11"/>
<contactref element="IC4" pad="19"/>
<contactref element="IC4" pad="18"/>
<contactref element="IC4" pad="17"/>
<contactref element="IC4" pad="16"/>
<contactref element="IC3" pad="10"/>
<contactref element="IC3" pad="10"/>
<contactref element="IC2" pad="10"/>
<contactref element="IC2" pad="10"/>
<contactref element="IC4" pad="12"/>
<contactref element="IC4" pad="12"/>
<contactref element="R3" pad="P$1"/>
<contactref element="IC3" pad="14"/>
<contactref element="IC3" pad="13"/>
<contactref element="IC3" pad="17"/>
<contactref element="IC3" pad="18"/>
<contactref element="U$1" pad="5"/>
<contactref element="U$1" pad="6"/>
<contactref element="U$1" pad="7"/>
<contactref element="GND" pad="1"/>
</signal>
<signal name="C1">
<contactref element="IC2" pad="3"/>
<contactref element="IC1" pad="9"/>
</signal>
<signal name="C2">
<contactref element="IC1" pad="7"/>
<contactref element="IC2" pad="4"/>
</signal>
<signal name="C3">
<contactref element="IC1" pad="6"/>
<contactref element="IC2" pad="7"/>
</signal>
<signal name="C4">
<contactref element="IC1" pad="5"/>
<contactref element="IC2" pad="8"/>
</signal>
<signal name="C5">
<contactref element="IC1" pad="3"/>
<contactref element="IC2" pad="13"/>
</signal>
<signal name="C6">
<contactref element="IC1" pad="2"/>
<contactref element="IC2" pad="14"/>
</signal>
<signal name="C7">
<contactref element="IC1" pad="4"/>
<contactref element="IC2" pad="17"/>
</signal>
<signal name="C8">
<contactref element="IC1" pad="13"/>
<contactref element="IC2" pad="18"/>
</signal>
<signal name="C9">
<contactref element="IC1" pad="12"/>
<contactref element="IC3" pad="3"/>
</signal>
<signal name="C10">
<contactref element="IC1" pad="14"/>
<contactref element="IC3" pad="4"/>
</signal>
<signal name="C11">
<contactref element="IC1" pad="15"/>
<contactref element="IC3" pad="7"/>
</signal>
<signal name="C12">
<contactref element="IC1" pad="1"/>
<contactref element="IC3" pad="8"/>
</signal>
<signal name="SEL1">
<contactref element="SEL1" pad="1"/>
<contactref element="IC4" pad="15"/>
</signal>
<signal name="SEL2">
<contactref element="SEL2" pad="1"/>
<contactref element="IC4" pad="14"/>
</signal>
<signal name="SEL3">
<contactref element="SEL3" pad="1"/>
<contactref element="IC4" pad="13"/>
</signal>
<signal name="SEL4">
<contactref element="SEL4" pad="1"/>
<contactref element="IC4" pad="11"/>
</signal>
<signal name="STROBE">
<contactref element="STRB" pad="1"/>
<contactref element="IC4" pad="9"/>
</signal>
<signal name="E0">
<contactref element="IC2" pad="2"/>
<contactref element="IC4" pad="8"/>
</signal>
<signal name="E1">
<contactref element="IC2" pad="5"/>
<contactref element="IC4" pad="7"/>
</signal>
<signal name="E2">
<contactref element="IC2" pad="6"/>
<contactref element="IC4" pad="6"/>
</signal>
<signal name="E3">
<contactref element="IC2" pad="9"/>
<contactref element="IC4" pad="5"/>
</signal>
<signal name="E4">
<contactref element="IC2" pad="12"/>
<contactref element="IC4" pad="4"/>
</signal>
<signal name="E5">
<contactref element="IC2" pad="15"/>
<contactref element="IC4" pad="3"/>
</signal>
<signal name="E6">
<contactref element="IC2" pad="16"/>
<contactref element="IC4" pad="2"/>
</signal>
<signal name="E7">
<contactref element="IC2" pad="19"/>
<contactref element="IC4" pad="1"/>
</signal>
<signal name="E8">
<contactref element="IC3" pad="2"/>
<contactref element="IC4" pad="23"/>
</signal>
<signal name="E9">
<contactref element="IC3" pad="5"/>
<contactref element="IC4" pad="22"/>
</signal>
<signal name="E10">
<contactref element="IC3" pad="6"/>
<contactref element="IC4" pad="21"/>
</signal>
<signal name="E11">
<contactref element="IC3" pad="9"/>
<contactref element="IC4" pad="20"/>
</signal>
<signal name="N$3">
<contactref element="R3" pad="P$2"/>
<contactref element="R4" pad="P$1"/>
<contactref element="U$1" pad="2"/>
</signal>
<signal name="PULSE">
<contactref element="CLK" pad="1"/>
<contactref element="IC3" pad="11"/>
<contactref element="IC2" pad="11"/>
</signal>
<signal name="N$2">
<contactref element="R5" pad="P$2"/>
<contactref element="R4" pad="P$2"/>
<contactref element="U$1" pad="1"/>
<contactref element="JP1" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="IC1" pad="10"/>
<contactref element="D1" pad="C"/>
</signal>
<signal name="N$1">
<contactref element="R1" pad="P$2"/>
<contactref element="12V" pad="1"/>
</signal>
<signal name="N$4">
<contactref element="U$1" pad="3"/>
<contactref element="R2" pad="P$2"/>
<contactref element="R1" pad="P$1"/>
</signal>
<signal name="N$5">
<contactref element="JP1" pad="2"/>
<contactref element="D1" pad="A"/>
</signal>
<signal name="N$6">
<contactref element="5V" pad="1"/>
<contactref element="JP1" pad="3"/>
</signal>
<signal name="N$8">
<contactref element="IC4" pad="10"/>
<contactref element="JP2" pad="2"/>
</signal>
<signal name="N$9">
<contactref element="JP2" pad="3"/>
<contactref element="2" pad="1"/>
</signal>
<signal name="N$10">
<contactref element="JP2" pad="1"/>
<contactref element="1" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
