<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.4.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="25.07" y2="0" width="0" layer="20"/>
<wire x1="25.07" y1="0" x2="25.07" y2="17.77" width="0" layer="20"/>
<wire x1="25.07" y1="17.77" x2="0" y2="17.77" width="0" layer="20"/>
<wire x1="0" y1="17.77" x2="0" y2="0" width="0" layer="20"/>
</plain>
<libraries>
<library name="gm-supply">
<description>&lt;b&gt;Supply&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;input, output, ground, and power supply.  
&lt;li&gt;these are used on a schematic for placeholders and on a board for pads for off-board components like jacks.
&lt;/ul&gt;</description>
<packages>
<package name="SQUARE">
<description>&lt;b&gt;Square Pad&lt;/b&gt;
&lt;ul&gt;&lt;li&gt;drill diameter 0.7 mm&lt;/li&gt;&lt;/ul&gt;</description>
</package>
</packages>
</library>
<library name="gm-caps-film-box">
<description>&lt;b&gt;Capacitors, Film, Box&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;1000pF - 2.2uF  (uF = µF = mF)
&lt;li&gt;popular nonpolarized capacitors because they are small
&lt;li&gt;these have short leads so that pad spacing equals lead spacing
&lt;li&gt;e.g., WIMA capacitors
&lt;/ul&gt;</description>
<packages>
<package name="072X025">
<description>&lt;b&gt;7.2mm x 2.5mm&lt;/b&gt;
&lt;p&gt;WIMA MKS2, MKP2</description>
</package>
</packages>
</library>
<library name="gm-pots">
<description>&lt;b&gt;Potentiometers&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;chassis-mount (e.g., Alpha 16mm) pots&lt;/li&gt;
&lt;li&gt;board-mount trim pots (1/4" and 3/8")&lt;/li&gt;
&lt;li&gt; all pot values have the same size package; you choose the value of resistance 
&lt;/ul&gt;</description>
<packages>
<package name="POT">
<description>&lt;b&gt;Potentiometer&lt;/b&gt;
&lt;p&gt;3 terminals for circuit board for wires connecting to 3 lugs of pot off-board</description>
</package>
</packages>
</library>
<library name="gm-trans">
<description>&lt;b&gt;Transistors&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;small signal amps (e.g., 2N508x)
&lt;li&gt;switching transistors (e.g., 2N2222, 2N390x)
&lt;li&gt;JFETs (e.g., J201, 2N3819, 2N5457)
&lt;li&gt;MOSFETs (e.g., BS170, BS250)
&lt;li&gt;mostly copied from Eagle libraries
&lt;/ul&gt;</description>
<packages>
<package name="SOT54ES">
</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="R0207/3">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;br&gt;
&lt;br&gt;
length: 6mm&lt;br&gt;
format: 0.1" (perfboard)&lt;br&gt;
spacing: 3 holes

&lt;p&gt;This length resistor applies to 1/4 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 = µF = mF)
&lt;li&gt;often used in power supply filters
&lt;/ul&gt;</description>
<packages>
<package name="063_025">
<description>&lt;b&gt;6.3mm diameter, 2.5 mm lead spacing, 0.1" pad spacing&lt;/b&gt;</description>
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="+" library="gm-supply" package="SQUARE" value="+9V(T)">
<attribute name="NAME"/>
</element>
<element name="C1" library="gm-caps-film-box" package="072X025" value=".0022">
<attribute name="NAME"/>
</element>
<element name="C2" library="gm-caps-film-box" package="072X025" value=".022">
<attribute name="NAME"/>
</element>
<element name="-" library="gm-supply" package="SQUARE" value="GND(T)">
<attribute name="NAME"/>
</element>
<element name="I" library="gm-supply" package="SQUARE" value="IN(T)"/>
<element name="O" library="gm-supply" package="SQUARE" value="OUT(T)"/>
<element name="DRIVE" library="gm-pots" package="POT" value=""/>
<element name="LEVEL" library="gm-pots" package="POT" value=""/>
<element name="Q1" library="gm-trans" package="SOT54ES" value="LND150">
<attribute name="NAME"/>
</element>
<element name="Q2" library="gm-trans" package="SOT54ES" value="LND150">
<attribute name="NAME"/>
</element>
<element name="R1" library="gm-resistors" package="R0207/3" value="1M">
<attribute name="NAME"/>
</element>
<element name="R2" library="gm-resistors" package="R0207/3" value="22K">
<attribute name="NAME"/>
</element>
<element name="R3" library="gm-resistors" package="R0207/3" value="4K7">
<attribute name="NAME"/>
</element>
<element name="R4" library="gm-resistors" package="R0207/3" value="250">
<attribute name="NAME"/>
</element>
<element name="R5" library="gm-resistors" package="R0207/3" value="5K7">
<attribute name="NAME"/>
</element>
<element name="R6" library="gm-resistors" package="R0207/3" value="250">
<attribute name="NAME"/>
</element>
<element name="C3" library="gm-caps-electro-pol" package="063_025" value="22 to 330 uF">
<attribute name="NAME"/>
</element>
</elements>
<signals>
<signal name="N$1">
<contactref element="Q1" pad="G"/>
<contactref element="R2" pad="1"/>
</signal>
<signal name="IN">
<contactref element="I" pad="1"/>
<contactref element="R1" pad="2"/>
<contactref element="R2" pad="2"/>
</signal>
<signal name="N$2">
<contactref element="Q1" pad="D"/>
<contactref element="C1" pad="1"/>
<contactref element="R3" pad="1"/>
</signal>
<signal name="N$3">
<contactref element="Q1" pad="S"/>
<contactref element="R4" pad="2"/>
</signal>
<signal name="N$4">
<contactref element="C1" pad="2"/>
<contactref element="DRIVE" pad="3"/>
</signal>
<signal name="N$5">
<contactref element="DRIVE" pad="2"/>
<contactref element="Q2" pad="G"/>
</signal>
<signal name="N$6">
<contactref element="R5" pad="1"/>
<contactref element="Q2" pad="D"/>
<contactref element="C2" pad="1"/>
</signal>
<signal name="N$7">
<contactref element="Q2" pad="S"/>
<contactref element="R6" pad="2"/>
<contactref element="C3" pad="+"/>
</signal>
<signal name="N$10">
<contactref element="C2" pad="2"/>
<contactref element="LEVEL" pad="3"/>
</signal>
<signal name="OUT">
<contactref element="LEVEL" pad="2"/>
<contactref element="O" pad="1"/>
</signal>
<signal name="+9V">
<contactref element="R3" pad="2"/>
<contactref element="R5" pad="2"/>
<contactref element="+" pad="1"/>
</signal>
<signal name="GND">
<contactref element="R1" pad="1"/>
<contactref element="R4" pad="1"/>
<contactref element="R6" pad="1"/>
<contactref element="DRIVE" pad="1"/>
<contactref element="LEVEL" pad="1"/>
<contactref element="-" pad="1"/>
<contactref element="C3" pad="-"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
