<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="9.0.1">
<drawing>
<board>
<plain>
<wire x1="24.13" y1="0" x2="100.33" y2="0" width="0.1524" layer="20"/>
<wire x1="100.33" y1="0" x2="100.33" y2="76.2" width="0.1524" layer="20"/>
<wire x1="100.33" y1="76.2" x2="24.13" y2="76.2" width="0.1524" layer="20"/>
<wire x1="24.13" y1="76.2" x2="24.13" y2="0" width="0.1524" layer="20"/>
<text>The Bells of Christmas</text>
<text>(c) Howard Sheppard</text>
</plain>
<libraries>
<library name="atmel">
<description>&lt;b&gt;AVR Devices&lt;/b&gt;&lt;p&gt;
Configurable logic, microcontrollers, nonvolatile memories&lt;p&gt;
Based on the following sources:&lt;p&gt;
&lt;ul&gt;
&lt;li&gt;www.atmel.com
&lt;li&gt;CD-ROM : Configurable Logic Microcontroller Nonvolatile Memory
&lt;li&gt;CadSoft download site, www.cadsoft.de or www.cadsoftusa.com , file at90smcu_v400.zip
&lt;li&gt;avr.lbr
&lt;/ul&gt;
&lt;author&gt;Revised by librarian@cadsoft.de&lt;/author&gt;</description>
<packages>
<package name="DIL28-3">
<description>&lt;B&gt;Dual In Line&lt;/B&gt; 0.3 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="2,54/1,1">
<description>&lt;b&gt;THROUGH-HOLE PAD&lt;/b&gt;</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="TO220V">
<description>&lt;b&gt;TO 200 vertical&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-Capacitors">
<description>&lt;h3&gt;SparkFun Capacitors&lt;/h3&gt;
This library contains capacitors. 
&lt;br&gt;
&lt;br&gt;
We've spent an enormous amount of time creating and checking these footprints and parts, but it is &lt;b&gt; the end user's responsibility&lt;/b&gt; to ensure correctness and suitablity for a given componet or application. 
&lt;br&gt;
&lt;br&gt;If you enjoy using this library, please buy one of our products at &lt;a href=" www.sparkfun.com"&gt;SparkFun.com&lt;/a&gt;.
&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="CPOL-RADIAL-2.5MM-6.5MM">
<description>2.5 mm spaced PTHs with 6.5 mm diameter outline</description>
</package>
<package name="CAP-PTH-2.54">
<description>2 PTH spaced 0.1" apart</description>
</package>
<package name="CAP-PTH-10MM">
<description>2 PTH spaced 10mm apart</description>
</package>
<package name="CPOL-RADIAL-5MM-10MM">
<description>5 mm spaced PTHs in 10 mm diameter silk ring</description>
</package>
</packages>
</library>
<library name="SparkFun-Clocks">
<description>&lt;h3&gt;SparkFun Clocks, Oscillators and Resonators&lt;/h3&gt;
This library contains the real-time clocks, oscillators, resonators, and crystals we use. 
&lt;br&gt;
&lt;br&gt;
We've spent an enormous amount of time creating and checking these footprints and parts, but it is &lt;b&gt; the end user's responsibility&lt;/b&gt; to ensure correctness and suitablity for a given componet or application. 
&lt;br&gt;
&lt;br&gt;If you enjoy using this library, please buy one of our products at &lt;a href=" www.sparkfun.com"&gt;SparkFun.com&lt;/a&gt;.
&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="HC49US">
<description>&lt;h3&gt;HC49/US 11.6x4.6mm PTH Crystal&lt;/h3&gt;
&lt;p&gt;&lt;a href="https://www.digikey.com/Web%20Export/Supplier%20Content/Citizen_300/PDF/Citizen_HC49US.pdf?redirected=1"&gt;Example Datasheet&lt;/a&gt;&lt;/p&gt;</description>
</package>
</packages>
</library>
<library name="SparkFun-Resistors">
<description>&lt;h3&gt;SparkFun Resistors&lt;/h3&gt;
This library contains resistors. Reference designator:R. 
&lt;br&gt;
&lt;br&gt;
We've spent an enormous amount of time creating and checking these footprints and parts, but it is &lt;b&gt; the end user's responsibility&lt;/b&gt; to ensure correctness and suitablity for a given componet or application. 
&lt;br&gt;
&lt;br&gt;If you enjoy using this library, please buy one of our products at &lt;a href=" www.sparkfun.com"&gt;SparkFun.com&lt;/a&gt;.
&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="AXIAL-0.3">
<description>&lt;h3&gt;AXIAL-0.3&lt;/h3&gt;
&lt;p&gt;Commonly used for 1/4W through-hole resistors. 0.3" pitch between holes.&lt;/p&gt;</description>
</package>
<package name="TRIMPOT-PTH-3386U">
<description>&lt;h3&gt;Trimpot - PTH, Trimpot w/ finger-adjustable knob&lt;/h3&gt;
&lt;p&gt;&lt;a href="https://www.sparkfun.com/products/9806"&gt;Trimpot 10K with Knob&lt;/a&gt; (COM-09806)&lt;/p&gt;
&lt;p&gt;&lt;a href="http://www.sparkfun.com/datasheets/Components/General/TSR-3386.pdf"&gt;Datasheet&lt;/a&gt;&lt;/p&gt;</description>
</package>
</packages>
</library>
<library name="ic-package">
<description>&lt;b&gt;IC Packages an Sockets&lt;/b&gt;&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="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>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="IC1" library="atmel" package="DIL28-3" value="ATMEGA 328P">
<attribute name="MF" value=""/>
<attribute name="MPN" value=""/>
<attribute name="OC_FARNELL" value="unknown"/>
<attribute name="OC_NEWARK" value="unknown"/>
</element>
<element name="9V" library="wirepad" package="2,54/1,1" value=""/>
<element name="&quot;&quot;" library="wirepad" package="2,54/1,1" value=""/>
<element name="C1" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="C3" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="IC5" library="linear" package="TO220V" value="7805"/>
<element name="X1" library="SparkFun-Clocks" package="HC49US" value="16MHz">
<attribute name="PROD_ID" value="XTAL-08181"/>
<attribute name="SF_ID" value="COM-00536"/>
</element>
<element name="C5" library="SparkFun-Capacitors" package="CAP-PTH-2.54" value="22pF">
<attribute name="PROD_ID" value="CAP-09128"/>
</element>
<element name="C6" library="SparkFun-Capacitors" package="CAP-PTH-2.54" value="22pF">
<attribute name="PROD_ID" value="CAP-09128"/>
</element>
<element name="R1" library="SparkFun-Resistors" package="AXIAL-0.3" value="10k">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="IC3" library="ic-package" package="DIL08" value="LM358"/>
<element name="IC4" library="ic-package" package="DIL08" value="LM386"/>
<element name="R13" library="SparkFun-Resistors" package="AXIAL-0.3" value="270">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="C9" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="0.47uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="VR1" library="SparkFun-Resistors" package="TRIMPOT-PTH-3386U" value="1M">
<attribute name="PROD_ID" value="RES-09730"/>
<attribute name="SF_SKU" value="COM-09806"/>
</element>
<element name="C11" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="R15" library="SparkFun-Resistors" package="AXIAL-0.3" value="270">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="C10" library="SparkFun-Capacitors" package="CAP-PTH-10MM" value="0.1uF">
<attribute name="PROD_ID" value="CAP-09321"/>
</element>
<element name="VR2" library="SparkFun-Resistors" package="TRIMPOT-PTH-3386U" value="10K">
<attribute name="PROD_ID" value="RES-09730"/>
<attribute name="SF_SKU" value="COM-09806"/>
</element>
<element name="VR3" library="SparkFun-Resistors" package="TRIMPOT-PTH-3386U" value="10K">
<attribute name="PROD_ID" value="RES-09730"/>
<attribute name="SF_SKU" value="COM-09806"/>
</element>
<element name="C13" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="C12" library="SparkFun-Capacitors" package="CPOL-RADIAL-5MM-10MM" value="220uF">
<attribute name="PROD_ID" value="CAP-09538"/>
</element>
<element name="C14" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="C2" library="SparkFun-Capacitors" package="CPOL-RADIAL-5MM-10MM" value="220uF">
<attribute name="PROD_ID" value="CAP-09538"/>
</element>
<element name="C15" library="SparkFun-Capacitors" package="CAP-PTH-10MM" value="0.05uF">
<attribute name="PROD_ID" value="CAP-09321"/>
</element>
<element name="R14" library="SparkFun-Resistors" package="AXIAL-0.3" value="10">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="GND1" library="wirepad" package="2,54/1,1" value=""/>
<element name="SPKR" library="wirepad" package="2,54/1,1" value=""/>
<element name="H1" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="H3" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="H4" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="H2" library="holes" package="3,2" value="MOUNT-HOLE3.2"/>
<element name="PB" library="wirepad" package="2,54/1,1" value=""/>
<element name="GND" library="wirepad" package="2,54/1,1" value=""/>
<element name="IC2" library="atmel" package="DIL28-3" value="ATMEGA 328P">
<attribute name="MF" value=""/>
<attribute name="MPN" value=""/>
<attribute name="OC_FARNELL" value="unknown"/>
<attribute name="OC_NEWARK" value="unknown"/>
</element>
<element name="X2" library="SparkFun-Clocks" package="HC49US" value="16MHz">
<attribute name="PROD_ID" value="XTAL-08181"/>
<attribute name="SF_ID" value="COM-00536"/>
</element>
<element name="C8" library="SparkFun-Capacitors" package="CAP-PTH-2.54" value="22pF">
<attribute name="PROD_ID" value="CAP-09128"/>
</element>
<element name="C7" library="SparkFun-Capacitors" package="CAP-PTH-2.54" value="22pF">
<attribute name="PROD_ID" value="CAP-09128"/>
</element>
<element name="C4" library="SparkFun-Capacitors" package="CPOL-RADIAL-2.5MM-6.5MM" value="10uF">
<attribute name="PROD_ID" value="CAP-08439"/>
</element>
<element name="R2" library="SparkFun-Resistors" package="AXIAL-0.3" value="10k">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R3" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R4" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R5" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="LED1" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED2" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED3" library="wirepad" package="2,54/1,1" value=""/>
<element name="R6" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R7" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R8" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="LED4" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED5" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED6" library="wirepad" package="2,54/1,1" value=""/>
<element name="R9" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R10" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R11" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="R12" library="SparkFun-Resistors" package="AXIAL-0.3" value="120">
<attribute name="PROD_ID" value=" "/>
</element>
<element name="LED8" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED9" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED7" library="wirepad" package="2,54/1,1" value=""/>
<element name="LED10" library="wirepad" package="2,54/1,1" value=""/>
<element name="GND2" library="wirepad" package="2,54/1,1" value=""/>
<element name="GND3" library="wirepad" package="2,54/1,1" value=""/>
<element name="R16" library="SparkFun-Resistors" package="AXIAL-0.3" value="10K">
<attribute name="PROD_ID" value=" "/>
</element>
</elements>
<signals>
<signal name="GND">
<contactref element="&quot;&quot;" pad="1"/>
<contactref element="C1" pad="2"/>
<contactref element="IC5" pad="2"/>
<contactref element="C5" pad="1"/>
<contactref element="C6" pad="1"/>
<contactref element="C9" pad="2"/>
<contactref element="VR1" pad="3"/>
<contactref element="IC3" pad="4"/>
<contactref element="C10" pad="2"/>
<contactref element="VR2" pad="1"/>
<contactref element="IC4" pad="2"/>
<contactref element="IC4" pad="4"/>
<contactref element="C12" pad="-"/>
<contactref element="C14" pad="2"/>
<contactref element="R14" pad="P$2"/>
<contactref element="GND1" pad="1"/>
<contactref element="GND" pad="1"/>
<contactref element="C7" pad="1"/>
<contactref element="C8" pad="1"/>
<contactref element="GND2" pad="1"/>
<contactref element="GND3" pad="1"/>
<contactref element="IC1" pad="8"/>
<contactref element="C3" pad="2"/>
<contactref element="C4" pad="2"/>
<contactref element="IC2" pad="8"/>
<contactref element="IC2" pad="22"/>
<contactref element="IC1" pad="22"/>
</signal>
<signal name="9V">
<contactref element="9V" pad="1"/>
<contactref element="C1" pad="1"/>
<contactref element="IC5" pad="1"/>
<contactref element="IC4" pad="6"/>
<contactref element="C12" pad="+"/>
</signal>
<signal name="5V">
<contactref element="IC1" pad="20"/>
<contactref element="IC1" pad="7"/>
<contactref element="C3" pad="1"/>
<contactref element="IC5" pad="3"/>
<contactref element="R1" pad="P$1"/>
<contactref element="IC3" pad="8"/>
<contactref element="R2" pad="P$1"/>
<contactref element="IC2" pad="20"/>
<contactref element="IC2" pad="7"/>
<contactref element="C4" pad="1"/>
<contactref element="R16" pad="P$2"/>
</signal>
<signal name="N$2">
<contactref element="X1" pad="2"/>
<contactref element="IC1" pad="9"/>
<contactref element="C5" pad="2"/>
</signal>
<signal name="N$3">
<contactref element="X1" pad="1"/>
<contactref element="IC1" pad="10"/>
<contactref element="C6" pad="2"/>
</signal>
<signal name="N$4">
<contactref element="R1" pad="P$2"/>
<contactref element="IC1" pad="1"/>
</signal>
<signal name="N$5">
<contactref element="IC1" pad="17"/>
<contactref element="R13" pad="P$1"/>
</signal>
<signal name="N$6">
<contactref element="R13" pad="P$2"/>
<contactref element="C9" pad="1"/>
<contactref element="VR1" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="VR1" pad="2"/>
<contactref element="IC3" pad="3"/>
</signal>
<signal name="N$8">
<contactref element="IC3" pad="1"/>
<contactref element="IC3" pad="2"/>
<contactref element="C11" pad="1"/>
</signal>
<signal name="N$9">
<contactref element="C11" pad="2"/>
<contactref element="R15" pad="P$1"/>
</signal>
<signal name="N$10">
<contactref element="C10" pad="1"/>
<contactref element="R15" pad="P$2"/>
<contactref element="VR2" pad="3"/>
</signal>
<signal name="N$11">
<contactref element="VR2" pad="2"/>
<contactref element="IC4" pad="3"/>
</signal>
<signal name="N$12">
<contactref element="IC4" pad="1"/>
<contactref element="VR3" pad="3"/>
</signal>
<signal name="N$13">
<contactref element="VR3" pad="2"/>
<contactref element="C13" pad="1"/>
</signal>
<signal name="N$14">
<contactref element="C13" pad="2"/>
<contactref element="IC4" pad="8"/>
</signal>
<signal name="N$15">
<contactref element="C14" pad="1"/>
<contactref element="IC4" pad="7"/>
</signal>
<signal name="N$16">
<contactref element="C2" pad="+"/>
<contactref element="IC4" pad="5"/>
<contactref element="C15" pad="1"/>
</signal>
<signal name="N$17">
<contactref element="C15" pad="2"/>
<contactref element="R14" pad="P$1"/>
</signal>
<signal name="N$18">
<contactref element="SPKR" pad="1"/>
<contactref element="C2" pad="-"/>
</signal>
<signal name="N$19">
<contactref element="IC1" pad="14"/>
<contactref element="PB" pad="1"/>
<contactref element="R16" pad="P$1"/>
</signal>
<signal name="N$22">
<contactref element="C7" pad="2"/>
<contactref element="X2" pad="2"/>
<contactref element="IC2" pad="9"/>
</signal>
<signal name="N$23">
<contactref element="IC2" pad="10"/>
<contactref element="X2" pad="1"/>
<contactref element="C8" pad="2"/>
</signal>
<signal name="N$24">
<contactref element="R2" pad="P$2"/>
<contactref element="IC2" pad="1"/>
</signal>
<signal name="N$25">
<contactref element="IC1" pad="5"/>
<contactref element="R3" pad="P$1"/>
</signal>
<signal name="N$26">
<contactref element="IC1" pad="11"/>
<contactref element="R4" pad="P$1"/>
</signal>
<signal name="N$27">
<contactref element="R4" pad="P$2"/>
<contactref element="LED2" pad="1"/>
</signal>
<signal name="N$28">
<contactref element="R3" pad="P$2"/>
<contactref element="LED1" pad="1"/>
</signal>
<signal name="N$29">
<contactref element="IC1" pad="12"/>
<contactref element="R5" pad="P$1"/>
</signal>
<signal name="N$30">
<contactref element="R5" pad="P$2"/>
<contactref element="LED3" pad="1"/>
</signal>
<signal name="N$31">
<contactref element="IC2" pad="5"/>
<contactref element="R6" pad="P$1"/>
</signal>
<signal name="N$32">
<contactref element="R6" pad="P$2"/>
<contactref element="LED4" pad="1"/>
</signal>
<signal name="N$33">
<contactref element="IC2" pad="11"/>
<contactref element="R7" pad="P$1"/>
</signal>
<signal name="N$34">
<contactref element="R7" pad="P$2"/>
<contactref element="LED5" pad="1"/>
</signal>
<signal name="N$35">
<contactref element="IC2" pad="12"/>
<contactref element="R8" pad="P$1"/>
</signal>
<signal name="N$36">
<contactref element="R8" pad="P$2"/>
<contactref element="LED6" pad="1"/>
</signal>
<signal name="N$37">
<contactref element="IC2" pad="15"/>
<contactref element="R9" pad="P$1"/>
</signal>
<signal name="N$38">
<contactref element="R9" pad="P$2"/>
<contactref element="LED8" pad="1"/>
</signal>
<signal name="N$39">
<contactref element="IC2" pad="16"/>
<contactref element="R10" pad="P$1"/>
</signal>
<signal name="N$40">
<contactref element="R10" pad="P$2"/>
<contactref element="LED9" pad="1"/>
</signal>
<signal name="N$41">
<contactref element="IC2" pad="17"/>
<contactref element="R11" pad="P$1"/>
<contactref element="R12" pad="P$1"/>
</signal>
<signal name="N$42">
<contactref element="R11" pad="P$2"/>
<contactref element="LED7" pad="1"/>
</signal>
<signal name="N$43">
<contactref element="R12" pad="P$2"/>
<contactref element="LED10" pad="1"/>
</signal>
<signal name="A0">
<contactref element="IC2" pad="23"/>
<contactref element="IC1" pad="23"/>
</signal>
<signal name="A1">
<contactref element="IC2" pad="24"/>
<contactref element="IC1" pad="24"/>
</signal>
<signal name="A2">
<contactref element="IC2" pad="25"/>
<contactref element="IC1" pad="25"/>
</signal>
<signal name="A3">
<contactref element="IC2" pad="26"/>
<contactref element="IC1" pad="26"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
