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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html lang="en">
<head>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">
<title>The Class-A Amplifier Site</title>
<link rel="StyleSheet" href="class-a.css" type="text/css" media="screen, print">
<link rel="shortcut icon" type="image/ico" href="favicon.ico">
<meta name=description
content="A site primarily dedicated to the John Linsley Hood Class-A amplifier design, originally published in 1969 and later updated in 1996.">
<meta name=keywords
content="John,L,Linsley,Hood,Class-A,amplifier,articles,audio,power,supply,design,circuit,schematic,capacitance multiplier,JLH,class A,jean,hiraga,classe a,monster,le,monstre">
</head>
<body background="slate.jpg" bgcolor="#E8E8E8" lang=EN-GB link=blue vlink=blue>
<div class=Section1>
<p align=right style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:right'><b>The Class-A
Amplifier Site</b></p>
<p align=right style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:right'><span
style='font-size:10.0pt'>This page was last updated on 18 January 2007</span></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a href="index.htm"
title=index.htm>[ Back to Main Index ]</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
<p align=center style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:center'><b>&nbsp;</b></p>
<p align=center style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:center'><b><span
style='font-size:20.0pt'>JLH Power Amp Schematics</span></b></p>
<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
margin-bottom:.0001pt'><a name=index></a>&nbsp;</p>
<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
margin-bottom:.0001pt'>&nbsp;</p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width="100%"
style='width:100.0%;border-collapse:collapse'>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="WW4-69.gif">Simple Class A Amplifier&nbsp;</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Wireless World
April 1969</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b><a
href="WW4-69a.gif">Power Supply&nbsp;</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="WW7-70.gif">15-20W Class AB Audio Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Wireless World July
1970</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:27.0pt;margin-bottom:.0001pt;text-align:left;text-indent:27.0pt'><b><a
href="WW7-70a.gif">Power Supply</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:27.0pt;margin-bottom:.0001pt;text-align:left;text-indent:27.0pt'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:0cm;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="HFN11-72.gif">A Direct-Coupled High Quality Stereo Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Hi-Fi News November
1972</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="HFN1-80.gif">A Simple 30 Watt Integrated Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Hi-Fi News January
1980</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:-1.35pt'><b><a
href="HFN12-80.gif">An Introduction to MOSFETs</a>  </b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:-1.35pt'>(Update
to ‘Simple 30W Integrated Amplifier’)</p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:-1.35pt'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Hi-Fi News December
1980</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="WW8-82.gif">80-100W MOSFET Audio Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Wireless World
August 1982</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="ETI7-84.gif">Audio Design Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>ETI July 1984</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b><a
href="ETI7-84a.gif">Power Supply</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="EWW3-89.gif">Class A/AB MOSFET Power Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Electronics &amp;
Wireless World March 1989</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="ETI5-89.gif">Audio Design 80W MOSFET Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>ETI May 1989</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b><a
href="ETI5-89a.gif">Power Supply</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="EWWW5-92.gif">IGBT Audio Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Electronics World
&amp; Wireless World May 1992</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="EWWW6-93.gif">An Integrated Audio Amplifier</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Electronics World
&amp; Wireless World June 1993</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b><a
href="EWWW6-93a.gif">Power Supply</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><a
href="EW9-96.gif">Class-A Power</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>Electronics World
September 1996</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b><a
href="EW9-96a.gif">Power Supply</a></b></p>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left;text-indent:25.65pt'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
<tr>
<td width="51%" valign=top style='width:51.82%;padding:0cm 0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b>&nbsp;</b></p>
</td>
<td width="48%" valign=top style='width:48.18%;padding:0cm 1.0cm 0cm 0cm'>
<p align=left style='margin-top:0cm;margin-right:5.65pt;margin-bottom:0cm;
margin-left:5.65pt;margin-bottom:.0001pt;text-align:left'>&nbsp;</p>
</td>
</tr>
</table>
<p class=MsoNormal style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt'><span style='font-size:12.0pt'>&nbsp;</span></p>
<p class=MsoNormal style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt'><span style='font-size:12.0pt'>&nbsp;</span></p>
<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
margin-bottom:.0001pt'><b><a href="index.htm" title=index.htm>[ Back to Main
Index ]</a></b></p>
<p style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;margin-left:1.0cm;
margin-bottom:.0001pt'>&nbsp;</p>
<div style='margin-left:1.0cm;margin-right:1.0cm'>
<hr />
</div>
<p align=left style='margin-top:0cm;margin-right:1.0cm;margin-bottom:0cm;
margin-left:1.0cm;margin-bottom:.0001pt;text-align:left'><b><span
style='font-size:8.0pt'>HISTORY:</span></b><span style='font-size:8.0pt'>&nbsp;&nbsp;
Page created 18/01/2007</span></p>
</div>
</body>
</html>
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