<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE eagle SYSTEM "eagle.dtd">
<eagle version="7.2.0">
<drawing>
<board>
<plain>
<wire x1="0" y1="0" x2="68.885" y2="0" width="0" layer="20"/>
<wire x1="68.885" y1="0" x2="68.885" y2="54.6" width="0" layer="20"/>
<wire x1="68.885" y1="54.6" x2="0" y2="54.6" width="0" layer="20"/>
<wire x1="0" y1="54.6" x2="0" y2="0" width="0" layer="20"/>
<hole x="2.54" y="52.07" drill="3.2"/>
<hole x="66.04" y="52.07" drill="3.2"/>
<hole x="2.54" y="2.54" drill="3.2"/>
<hole x="66.04" y="2.54" drill="3.2"/>
<text>electronicaudioexperiments.com/diy
for personal and educational use only</text>
<text>Steiner VCF</text>
</plain>
<libraries>
<library name="mb_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="mb_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="B25P">
<description>&lt;b&gt;Potentiometer&lt;/b&gt;&lt;p&gt;
1/4" on-board trim potentiometer</description>
</package>
<package name="16MM_PCB_PADS_SMALL">
</package>
</packages>
</library>
<library name="mb_caps-electro">
<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>
<package name="050_020_1">
<description>&lt;b&gt;5mm diameter, 2mm lead spacing, 0.1" pad spacing&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="mb_caps-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="072X045">
<description>&lt;b&gt;7.2mm x 4.5mm&lt;/b&gt;
&lt;p&gt;WIMA MKP2, MKS2</description>
</package>
<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="mb_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>
<package name="R0207/1V">
<description>&lt;b&gt;RESISTOR&lt;/b&gt;&lt;br&gt;
&lt;br&gt;
vertical position&lt;br&gt;
format: 0.1" (perfboard)&lt;br&gt;
spacing: 1 hole

&lt;p&gt;This length resistor applies to 1/4 watt metal film.</description>
</package>
</packages>
</library>
<library name="mb_diodes">
<description>&lt;b&gt;Diodes&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;Zener 1N47xx (as in protection for the MOSFET in the AMZ MOSFET Booster)
&lt;li&gt;rectifier 1N4001-1N4008 (for polarity reversal protection in power supply sections)
&lt;li&gt;clipping 1N914 (as in a TS808)
&lt;li&gt;LED (light emitting diode, 3mm and 5mm)
&lt;li&gt;mostly gathered from Eagle libraries
&lt;/ul&gt;</description>
<packages>
<package name="DO41-3">
<description>&lt;b&gt;DO-41 0.3" pad spacing&lt;/b&gt;</description>
</package>
<package name="DO35-3">
<description>&lt;B&gt;DO-35 0.3" spacing&lt;/B&gt;</description>
</package>
</packages>
</library>
<library name="mb_ics">
<description>&lt;b&gt;Integrated Circuits&lt;/b&gt;
&lt;ul&gt;
&lt;li&gt;mostly op amps (e.g., 4558, TL072)&lt;/li&gt;
&lt;li&gt;also CD4049 (for Anderton's Tube Sound Fuzz, the Red Llama, ...)
&lt;li&gt;generally gathered from Eagle libraries
&lt;/ul&gt;</description>
<packages>
<package name="DIL08">
<description>&lt;b&gt;Dual In Line Package&lt;/b&gt;</description>
</package>
<package name="SOCKED-08">
<description>&lt;b&gt;Dual In Line Socket&lt;/b&gt;</description>
</package>
</packages>
</library>
<library name="mb_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="TO92-">
</package>
</packages>
</library>
</libraries>
<attributes>
</attributes>
<variantdefs>
</variantdefs>
<elements>
<element name="A" library="mb_supply" package="SQUARE" value=""/>
<element name="AP1" library="mb_supply" package="SQUARE" value=""/>
<element name="AP2" library="mb_supply" package="SQUARE" value=""/>
<element name="B" library="mb_supply" package="SQUARE" value=""/>
<element name="CV_BIAS" library="mb_pots" package="B25P" value="2.5K">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="BP" library="mb_supply" package="SQUARE" value=""/>
<element name="C1" library="mb_caps-electro" package="063_025" value="47u"/>
<element name="C10" library="mb_caps-electro" package="063_025" value="47u"/>
<element name="C11" library="mb_caps-electro" package="063_025" value="47u"/>
<element name="C12" library="mb_caps-box" package="072X045" value="1u"/>
<element name="C13" library="mb_caps-box" package="072X045" value="1u"/>
<element name="C14" library="mb_caps-box" package="072X025" value="100p"/>
<element name="C15" library="mb_caps-electro" package="063_025" value="47u"/>
<element name="C16" library="mb_caps-box" package="072X025" value="100n MLCC"/>
<element name="C17" library="mb_caps-box" package="072X025" value="100p"/>
<element name="C2" library="mb_caps-box" package="072X025" value="100n MLCC"/>
<element name="C3" library="mb_caps-electro" package="050_020_1" value="10u"/>
<element name="C4" library="mb_caps-box" package="072X025" value="100n"/>
<element name="C5" library="mb_caps-box" package="072X025" value="100p"/>
<element name="C6" library="mb_caps-box" package="072X025" value="100p"/>
<element name="C7" library="mb_caps-box" package="072X025" value="2.2n"/>
<element name="C8" library="mb_caps-box" package="072X025" value="2.2n"/>
<element name="C9" library="mb_caps-box" package="072X025" value="2.2n"/>
<element name="CLR" library="mb_resistors" package="R0207/3" value="4.7k"/>
<element name="D1" library="mb_diodes" package="DO41-3" value="1N5817"/>
<element name="D10" library="mb_diodes" package="DO35-3" value=""/>
<element name="D11" library="mb_diodes" package="DO35-3" value=""/>
<element name="D2" library="mb_diodes" package="DO35-3" value="1N4148"/>
<element name="D3" library="mb_diodes" package="DO35-3" value=""/>
<element name="D4" library="mb_diodes" package="DO35-3" value=""/>
<element name="D5" library="mb_diodes" package="DO35-3" value=""/>
<element name="D6" library="mb_diodes" package="DO35-3" value=""/>
<element name="D7" library="mb_diodes" package="DO35-3" value=""/>
<element name="D8" library="mb_diodes" package="DO35-3" value=""/>
<element name="D9" library="mb_diodes" package="DO35-3" value=""/>
<element name="DRIVE" library="mb_pots" package="16MM_PCB_PADS_SMALL" value="A50K"/>
<element name="FREQ" library="mb_pots" package="16MM_PCB_PADS_SMALL" value="B50K"/>
<element name="G" library="mb_supply" package="SQUARE" value=""/>
<element name="HP" library="mb_supply" package="SQUARE" value=""/>
<element name="I" library="mb_supply" package="SQUARE" value=""/>
<element name="IC1" library="mb_ics" package="DIL08" value="TL072P"/>
<element name="IC2" library="mb_ics" package="DIL08" value="TL072P"/>
<element name="IC3" library="mb_ics" package="SOCKED-08" value="LT1054">
<attribute name="VALUE"/>
<attribute name="NAME"/>
</element>
<element name="JP1" library="mb_resistors" package="R0207/1V" value="0">
<attribute name="NAME"/>
<attribute name="VALUE"/>
</element>
<element name="L+" library="mb_supply" package="SQUARE" value=""/>
<element name="L-" library="mb_supply" package="SQUARE" value=""/>
<element name="LP" library="mb_supply" package="SQUARE" value=""/>
<element name="O" library="mb_supply" package="SQUARE" value=""/>
<element name="Q1" library="mb_trans" package="TO92-" value="2N3904"/>
<element name="Q2" library="mb_trans" package="TO92-" value="2N3904"/>
<element name="R1" library="mb_resistors" package="R0207/3" value="22K"/>
<element name="R10" library="mb_resistors" package="R0207/3" value="47K"/>
<element name="R11" library="mb_resistors" package="R0207/3" value="2.2K"/>
<element name="R12" library="mb_resistors" package="R0207/3" value="1K"/>
<element name="R13" library="mb_resistors" package="R0207/3" value="100"/>
<element name="R14" library="mb_resistors" package="R0207/3" value="1K"/>
<element name="R15" library="mb_resistors" package="R0207/3" value="3.3K"/>
<element name="R16" library="mb_resistors" package="R0207/3" value="100"/>
<element name="R17" library="mb_resistors" package="R0207/3" value="1K"/>
<element name="R18" library="mb_resistors" package="R0207/3" value="1Meg"/>
<element name="R19" library="mb_resistors" package="R0207/3" value="4.7K"/>
<element name="R2" library="mb_resistors" package="R0207/3" value="47K"/>
<element name="R20" library="mb_resistors" package="R0207/3" value="100K"/>
<element name="R21" library="mb_resistors" package="R0207/3" value="100"/>
<element name="R22" library="mb_resistors" package="R0207/3" value="47K"/>
<element name="R23" library="mb_resistors" package="R0207/3" value="47"/>
<element name="R24" library="mb_resistors" package="R0207/3" value="1K"/>
<element name="R25" library="mb_resistors" package="R0207/3" value="47K"/>
<element name="R26" library="mb_resistors" package="R0207/3" value="10K"/>
<element name="R3" library="mb_resistors" package="R0207/3" value="1M"/>
<element name="R4" library="mb_resistors" package="R0207/3" value="10K"/>
<element name="R5" library="mb_resistors" package="R0207/3" value="1Meg"/>
<element name="R6" library="mb_resistors" package="R0207/3" value="2.2K"/>
<element name="R7" library="mb_resistors" package="R0207/3" value="3.3K"/>
<element name="R8" library="mb_resistors" package="R0207/3" value="1K"/>
<element name="R9" library="mb_resistors" package="R0207/3" value="47K"/>
<element name="RES" library="mb_pots" package="16MM_PCB_PADS_SMALL" value="A50K"/>
<element name="V" library="mb_supply" package="SQUARE" value=""/>
<element name="VOL" library="mb_pots" package="16MM_PCB_PADS_SMALL" value="A50K"/>
</elements>
<signals>
<signal name="GND">
<contactref element="L-" pad="1"/>
<contactref element="C1" pad="-"/>
<contactref element="G" pad="1"/>
<contactref element="C2" pad="2"/>
<contactref element="R3" pad="1"/>
<contactref element="C5" pad="1"/>
<contactref element="R5" pad="1"/>
<contactref element="IC3" pad="3"/>
<contactref element="C15" pad="+"/>
<contactref element="C16" pad="2"/>
<contactref element="IC1" pad="5"/>
<contactref element="C10" pad="-"/>
<contactref element="R8" pad="2"/>
<contactref element="Q2" pad="2"/>
<contactref element="C11" pad="+"/>
<contactref element="CV_BIAS" pad="1"/>
<contactref element="R18" pad="2"/>
<contactref element="IC2" pad="3"/>
<contactref element="R20" pad="1"/>
<contactref element="R23" pad="2"/>
<contactref element="R25" pad="1"/>
</signal>
<signal name="N$1">
<contactref element="CLR" pad="1"/>
<contactref element="L+" pad="1"/>
</signal>
<signal name="N$3">
<contactref element="V" pad="1"/>
<contactref element="D1" pad="A"/>
</signal>
<signal name="+9V">
<contactref element="CLR" pad="2"/>
<contactref element="D1" pad="C"/>
<contactref element="C1" pad="+"/>
<contactref element="C2" pad="1"/>
<contactref element="IC3" pad="8"/>
<contactref element="JP1" pad="2"/>
<contactref element="IC1" pad="8"/>
<contactref element="IC2" pad="8"/>
<contactref element="R13" pad="1"/>
<contactref element="R22" pad="1"/>
</signal>
<signal name="N$5">
<contactref element="I" pad="1"/>
<contactref element="C4" pad="1"/>
<contactref element="R3" pad="2"/>
</signal>
<signal name="N$6">
<contactref element="C4" pad="2"/>
<contactref element="R4" pad="2"/>
</signal>
<signal name="N$7">
<contactref element="R4" pad="1"/>
<contactref element="R5" pad="2"/>
<contactref element="C5" pad="2"/>
<contactref element="IC1" pad="3"/>
</signal>
<signal name="N$4">
<contactref element="IC1" pad="2"/>
<contactref element="IC1" pad="1"/>
<contactref element="R1" pad="2"/>
</signal>
<signal name="N$26">
<contactref element="IC3" pad="2"/>
<contactref element="C3" pad="+"/>
</signal>
<signal name="N$27">
<contactref element="IC3" pad="4"/>
<contactref element="C3" pad="-"/>
</signal>
<signal name="-9V">
<contactref element="IC1" pad="4"/>
<contactref element="IC2" pad="4"/>
<contactref element="IC3" pad="5"/>
<contactref element="C15" pad="-"/>
<contactref element="C16" pad="1"/>
<contactref element="R16" pad="2"/>
</signal>
<signal name="N$24">
<contactref element="IC3" pad="1"/>
<contactref element="JP1" pad="1"/>
</signal>
<signal name="N$2">
<contactref element="R1" pad="1"/>
<contactref element="IC1" pad="6"/>
<contactref element="R7" pad="2"/>
</signal>
<signal name="N$8">
<contactref element="IC1" pad="7"/>
<contactref element="B" pad="1"/>
<contactref element="A" pad="1"/>
<contactref element="C6" pad="2"/>
<contactref element="DRIVE" pad="2"/>
<contactref element="DRIVE" pad="3"/>
</signal>
<signal name="N$9">
<contactref element="D2" pad="A"/>
<contactref element="D3" pad="C"/>
</signal>
<signal name="N$10">
<contactref element="D3" pad="A"/>
<contactref element="D4" pad="C"/>
<contactref element="C7" pad="2"/>
</signal>
<signal name="N$11">
<contactref element="D4" pad="A"/>
<contactref element="D5" pad="C"/>
</signal>
<signal name="N$12">
<contactref element="D5" pad="A"/>
<contactref element="D6" pad="C"/>
<contactref element="C9" pad="2"/>
<contactref element="C12" pad="1"/>
</signal>
<signal name="N$13">
<contactref element="D6" pad="A"/>
<contactref element="D7" pad="C"/>
</signal>
<signal name="N$14">
<contactref element="D7" pad="A"/>
<contactref element="D8" pad="C"/>
<contactref element="C8" pad="2"/>
</signal>
<signal name="N$15">
<contactref element="D8" pad="A"/>
<contactref element="D9" pad="C"/>
</signal>
<signal name="N$16">
<contactref element="LP" pad="1"/>
<contactref element="AP1" pad="1"/>
<contactref element="R2" pad="2"/>
</signal>
<signal name="N$17">
<contactref element="R2" pad="1"/>
<contactref element="R6" pad="1"/>
<contactref element="R11" pad="1"/>
<contactref element="R12" pad="2"/>
</signal>
<signal name="N$18">
<contactref element="R6" pad="2"/>
<contactref element="D2" pad="C"/>
<contactref element="Q1" pad="1"/>
</signal>
<signal name="N$19">
<contactref element="C7" pad="1"/>
<contactref element="C8" pad="1"/>
<contactref element="R10" pad="2"/>
<contactref element="R14" pad="1"/>
</signal>
<signal name="N$20">
<contactref element="C9" pad="1"/>
<contactref element="R9" pad="2"/>
<contactref element="R8" pad="1"/>
</signal>
<signal name="N$21">
<contactref element="HP" pad="1"/>
<contactref element="AP2" pad="1"/>
<contactref element="R9" pad="1"/>
</signal>
<signal name="N$22">
<contactref element="BP" pad="1"/>
<contactref element="R10" pad="1"/>
</signal>
<signal name="N$23">
<contactref element="D9" pad="A"/>
<contactref element="R11" pad="2"/>
<contactref element="Q2" pad="1"/>
</signal>
<signal name="N$25">
<contactref element="R13" pad="2"/>
<contactref element="C10" pad="+"/>
<contactref element="R12" pad="1"/>
</signal>
<signal name="N$28">
<contactref element="R14" pad="2"/>
<contactref element="IC2" pad="7"/>
<contactref element="D11" pad="C"/>
<contactref element="D10" pad="A"/>
<contactref element="R19" pad="1"/>
<contactref element="RES" pad="2"/>
<contactref element="RES" pad="3"/>
<contactref element="C17" pad="1"/>
</signal>
<signal name="N$29">
<contactref element="Q1" pad="3"/>
<contactref element="R15" pad="1"/>
<contactref element="Q2" pad="3"/>
</signal>
<signal name="N$31">
<contactref element="R15" pad="2"/>
<contactref element="R16" pad="1"/>
<contactref element="C11" pad="-"/>
</signal>
<signal name="N$34">
<contactref element="Q1" pad="2"/>
<contactref element="R17" pad="1"/>
<contactref element="R24" pad="2"/>
</signal>
<signal name="N$35">
<contactref element="R17" pad="2"/>
<contactref element="CV_BIAS" pad="3"/>
<contactref element="CV_BIAS" pad="2"/>
</signal>
<signal name="N$30">
<contactref element="C12" pad="2"/>
<contactref element="R18" pad="1"/>
<contactref element="IC2" pad="5"/>
</signal>
<signal name="N$37">
<contactref element="IC2" pad="6"/>
<contactref element="D10" pad="C"/>
<contactref element="D11" pad="A"/>
<contactref element="R26" pad="1"/>
<contactref element="R25" pad="2"/>
<contactref element="C17" pad="2"/>
</signal>
<signal name="N$38">
<contactref element="R19" pad="2"/>
<contactref element="IC2" pad="2"/>
<contactref element="VOL" pad="1"/>
<contactref element="C14" pad="1"/>
</signal>
<signal name="N$36">
<contactref element="VOL" pad="2"/>
<contactref element="VOL" pad="3"/>
<contactref element="IC2" pad="1"/>
<contactref element="C13" pad="1"/>
<contactref element="C14" pad="2"/>
</signal>
<signal name="N$40">
<contactref element="C13" pad="2"/>
<contactref element="R21" pad="2"/>
<contactref element="R20" pad="2"/>
</signal>
<signal name="N$41">
<contactref element="R21" pad="1"/>
<contactref element="O" pad="1"/>
</signal>
<signal name="N$39">
<contactref element="R24" pad="1"/>
<contactref element="FREQ" pad="2"/>
</signal>
<signal name="N$42">
<contactref element="FREQ" pad="1"/>
<contactref element="R23" pad="1"/>
</signal>
<signal name="N$43">
<contactref element="R22" pad="2"/>
<contactref element="FREQ" pad="3"/>
</signal>
<signal name="N$44">
<contactref element="R26" pad="2"/>
<contactref element="RES" pad="1"/>
</signal>
<signal name="N$45">
<contactref element="DRIVE" pad="1"/>
<contactref element="R7" pad="1"/>
<contactref element="C6" pad="1"/>
</signal>
</signals>
</board>
</drawing>
</eagle>
