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<td align="right" class="tap" valign="bottom">The Audio Pages</td></table>
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<tr><td class="hdrl">&nbsp;Elliott Sound Products</td></tr>
<tr><td class="hdrl"><i>&nbsp;Professional results for the Do-It-Yourself enthusiast</i></td>
<td align="right" class="t-wht"><b>Average &gt;1,700 Visitors Per Day Since Jan 2001</b>&nbsp;</td>
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<p class="t-pic"><img src="a.gif" alt="arrow" height="1" width="1">Pages Last Updated September 2024</p>
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<p>&nbsp;</p><p>&nbsp;</p>
<hr /><p align="justify" class="t_12">Welcome to ESP, the home of <a href="why-diy.htm" target="_blank"><u>DIY</u></a> audio and electronics articles, and PCBs for popular projects.&nbsp; Electronics is a wonderful hobby, and with DIY there is a huge scope to get the best performance for less money than otherwise.&nbsp; DIY is fun and educational, and by building your own audio equipment, you get to learn electronics as well as build equipment that may cost a great deal more in the shops.&nbsp; ESP is committed to providing high quality projects that are known to work, printed circuit boards (PCBs) for the most popular projects, and to assist you if necessary to complete or debug your project.&nbsp; There is a very wide range of power amplifiers, preamps, guitar/ bass amplifiers, studio equipment, effects, and other projects to build, including loudspeakers, subwoofers, and many others.&nbsp; Purchase PCBs to gain access to even more information.&nbsp; sound-au&trade; is a trade mark of Elliott Sound Products, and represents the site's primary focus (sound) and where I'm located (au - Australia).</p>
<p align="center"><b class="t_11b">IMPORTANT: Please see the <a href="disclaimer.htm" target="_blank"><u>disclaimer</u></a> for information about these pages.</b></p>
<hr /><br />
<table style="width: 700px;" align="center">
<tr><td valign="top"><img src="new-banner.gif" alt="new" />
<td><a href="project254.htm" target="_blank">Asymmetrical Crossover Using P09 Board</a><br />
<a href="project253.htm" target="_blank">18dB/Octave State-Variable Xover</a><br />
<a href="project252.htm" target="_blank">6-Band Guitar Equaliser</a><br />
<a href="project251.htm" target="_blank">Protected DC Load</a><br />
<a href="project250.htm" target="_blank">Inductor Saturation Tester</a><br />
<a href="project249.htm" target="_blank">Guitar/ Bass Booster Circuits</a><br />
<a href="project248.htm" target="_blank">Low-Voltage Charge-Pumps</a><br />
<a href="project247.htm" target="_blank">Tape Head Preamp - NAB/IEC</a><br />
<a href="project246.htm" target="_blank">Versatile Clipping Indicator</a><br />
<a href="project245.htm" target="_blank">MOSFET Relay Using TPSI3052-Q1</a><br />
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<p><b class="under">The Coronavirus (COVID-19) outbreak has little or no effect on postal deliveries.&nbsp; ESP hopes that all customers and readers remain well, <img src="p247-pic.jpg" width="700" height="386" alt="" border="0"><img src="p247-f4.gif" width="700" height="280" alt="" border="0"><img src="p247-f3.gif" width="700" height="300" alt="" border="0"><img src="p247-f2.gif" width="700" height="300" alt="" border="0"><img src="p247-f1.gif" width="700" height="320" alt="" border="0">
and my thoughts are with anyone affected by this pandemic.&nbsp; Everyone - please stay safe!</p>
<p class="t_12b" align="center">For The best information I have about international postage, see &lt;&lt; <a href="covid-19.htm" target="_blank">COVID-19</a> &gt;&gt;</p>
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<p align="center"><b><i>Go to the <u><a href="https://sound-au.com/contact.htm">Contact Page</a></u> to send me an email.</i></b></p>
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<tr class="tbldark"><td colspan="2"><img src="60px.gif" alt="" /><b>Products &amp; Services</b><td><i><small>Update</small></i></tr>
<tr><td><img src="5px.gif" alt="" /></td></tr>
<!--tr><td width="300"><span class="imgswap"><a href="projects.htm"><img src="a1.gif" alt="Projects"/><b class="bb">Projects</b><td valign="bottom">Complete designs and ideas, with schematics and details of how each circuit works, including alternative uses (if applicable)&nbsp;</td></a></span>
<td valign="bottom"><i class="t-red">Aug 2021</i></td></tr-->
<tr><td width="300"><span class="imgswap"><a href="projects.htm" style="display:block;"><img src="a1.gif" alt="Progects" /><b class="bb">Projects</b></a></span></td>
<td valign="bottom">Complete designs and ideas, with schematics and details of how each circuit works, including alternative uses (if applicable)&nbsp; <img src="new.gif" alt="new" /></td>
<td valign="bottom"><i class="t-red">Sep 2024</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="p-list.htm" style="display:block;"><img src="a1.gif" alt="List" /><b class="bb">Project List</b></a></span></td>
<td valign="bottom">Projects 'Quick Access Links' To All Projects In Numerical Order &nbsp;</td><td><i class="t-red">Aug 2024</i></td></tr>
<tr><td><img src="5px.gif" alt="" />
<tr><td><span class="imgswap"><a href="purchase.htm" style="display:block;"><img src="a1.gif" alt="Purchase" /><b class="t-index">Purchase Information</b></a></span></td>
<td valign="bottom">Project Printed Circuit Boards and other ESP merchandise</td><td><i class="t-blu">Jul 2024</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="https://sound-au.com/pcb/pricelist.html" style="display:block;"><img src="a1.gif" alt="Prices" /><b class="t-index">Price List</b></a></span></td>
<td valign="bottom">Complete Pricelist for all Products - <span class="t_11b">Includes postage to most regions (tracked airmail is used for <i>all</i> orders.</span></td>
<td valign="bottom"><i class="t-red">Jul 2024</i></td></tr>
<tr><td><span class="imgswap"><a href="https://sound-au.com/pcb/paypal-cart.html" style="display:block;"><img src="a1.gif" alt="PayPal" /><b class="bb">PayPal Shopping Cart</b></a></span></td>
<td valign="bottom">ESP products in a convenient shopping cart (USD non-Australian purchases <i>only</i>)</td><td><i class="t-blu">Jul 2024</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="https://sound-au.com/contact.htm" style="display:block;" target="_blank"><img src="a1.gif" alt="email" /><b class="bb">Contact</b></a></span></td>
<td valign="bottom">Send an email to ESP</td><td><br></td></tr>
<!-- articles & info -->
<tr><td>&nbsp;</td></tr>
<tr class="tbldark"><td colspan="2"><img src="60px.gif" alt="" /><b>Articles &amp; Information</b><td><i class="t_10">Update</i></tr>
<tr><td><img src="5px.gif" alt="" /></td></tr>
<tr><td><span class="imgswap"><a href="articles.htm" style="display:block;"><img src="a1.gif" alt="articles" /><b class="bb">Articles</b></a></span></td>
<td valign="bottom">Amplifier and power supply design, loudspeakers, electronics theory, beginner information, test and measurement, etc. <img src="new.gif" alt="" /></td>
<td><i class="t-red">Sep 2024</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="appnotes/index.html" style="display:block;"><img src="a1.gif" alt="app notes" /><b class="t-index">App. Notes</b></a></span></td>
<td valign="bottom">Application notes, covering a wide range of different applications, not necessarily audio related</td><td><i class="t-blu">May 2022</i></td></tr>
<tr><td><span class="imgswap"><a href="lamps/index.html" style="display:block;"><img src="a1.gif" alt="lamps" /><b class="bb">Lamps &amp; Energy</b></a></span></td>
<td valign="bottom">Covers not only lamps, but inrush current, external power supplies (aka 'wall warts'), power factor and other poorly understood topics.</td><td><i class="t-blu">Jul 2020</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="valves/index.html" style="display:block;"><img src="a1.gif" alt="valves" /><b class="bb">Valves</b></a></span></td>
<td valign="bottom">Valve (vacuum tube) amplifiers, information and analysis. Includes a couple of valve-related projects</td><td><i class="t-blu">Jan 2019</i></td></tr>
<tr><td><span class="imgswap"><a href="tcaas/index-0.htm" style="display:block;"><img src="a1.gif" alt="tcaas" /><b class="bb">The Class-A Amplifier Site</b></a></span></td>
<td valign="bottom">TCAAS (by Geoff Moss in the UK) is now hosted as an archive by ESP. &nbsp; <span class="t_11"><b>Please note:</b> &nbsp; <i>Queries will be answered, but only if kept brief.</i></span></td>
<td><i class="t-blu">Nov 2012</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="clocks/index.html" style="display:block;"><img src="a1.gif" alt="clocks" /><b class="bb">Clocks</b></a></span></td>
<td valign="bottom">There is great synergy between my life-long career and my hobby - see why here.</td><td><i class="t-blu">Dec 2019</i></td></tr>
<tr><td><span class="imgswap"><a href="schools.htm" style="display:block;"><img src="a1.gif" alt="school" /><b class="bb">Education</b></a></span></td>
<td valign="bottom">Customised projects for schools, technical colleges and universities</td><td><i class="t-blu">2003</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="contract.htm" style="display:block;"><img src="a1.gif" alt="consult" /><b class="bb">Consulting</b></a></span></td>
<td valign="bottom">ESP also offers custom design and consulting services</td><td><i class="t-blu">2002</i></td></tr>
<tr><td>&nbsp;</td></tr>
<!-- navigation & sub-indexes -->
<tr class="tbldark"><td><img src="60px.gif" alt="" /><b>Navigation &amp; Utilities</b></td><td></td><td></td></tr>
<tr><td><img src="5px.gif" alt="" /></td></tr>
<tr><td><span class="imgswap"><a href="site-map.htm" style="display:block;"><img src="a1.gif" alt="site" /><b class="bb">Site Map</b></a></span></td>
<td valign="bottom">Complete index of all available pages on this site</td><td></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="search-form2.html" target="_blank" style="display:block;"><img src="a1.gif" alt="find" /><b class="t-index">Site Search</b></a></span></td>
<td valign="bottom">Use the Freefind Custom Search to find a particular article or project </td><td>&nbsp;</td></tr>
<tr><td><span class="imgswap"><a href="search-form.html" target="_blank" style="display:block;"><img src="a1.gif" alt="find" /><b class="bb">Google&trade; Search</b></a></span></td>
<td>Search the ESP website with Google&trade; Custom Search to find what you are looking for </td><td>&nbsp;</td></tr>
<tr><td colspan="5"><hr /><!--img src="5px-grey.gif" /--><td><td><td>
<tr class="tblgrey"><td valign="top"><span class="imgswap"><a href="https://sound-au.com/ESP_forum/" style="display:block;" target="_blank"><img src="a1.gif" alt="forum" /><b class="bb">ESP Forum</b></a></span></td>
<td valign="top" colspan="2">Discuss ESP projects and articles with other readers on the ESP Forum. When you sign up, you get an email to verify your address.<br />
<!--tr><td><img src="60px.gif" /><td-->Requires 'Dual Login' - initial login details ... &nbsp; Username ... <span style="color:red; font-style:italic;"><b>forum</b></span>,&nbsp; password ... <span style="color:red; font-style:italic;"><b>esp-forum</b></span></td><td valign="bottom">&nbsp;</td></tr>
<tr><td valign="bottom"><span class="imgswap"><a href="https://sound-au.com/guestbook/view.php" style="display:block;" target="_blank"><img src="a1.gif" alt="gb" /><b class="bb">ESP Guestbook</b></a></span></td>
<td valign="bottom" colspan="2">View or Sign the ESP Guestbook (Note: Requires login - details ... Username ... <span style="color:red; font-style:italic;"><b>guest</b></span>,&nbsp; password ... <span style="color:red; font-style:italic;"><b>esp-gb</b></span> )</td><td valign="bottom">&nbsp;</td></tr>
<tr><td><img src="5px.gif" alt="" />
<tr class="tblgrey"><td valign="bottom"><span class="imgswap"><a href="https://sound-au.com/gallery/gallery.htm" style="display:block;"><img src="a1.gif" alt="gallery" /><b class="bb">ESP Gallery</b></a></span></td>
<td valign="bottom">Have a look at some of the outstanding builds using ESP boards - <i>Contributions welcome!</i>&nbsp; <img src="new.gif" alt="" /></td><td valign="bottom"><i class="t_10">Feb 2022</i></td></tr>
<!-- privacy, ethics & security -->
<tr><td>&nbsp;<td>
</td></tr><tr class="tbldark"><td colspan="2"><img src="60px.gif" alt="" /><b>Privacy, Ethics &amp; Security</b> <td><i><small>Update</small></i></tr>
<tr><td><img src="5px.gif" alt="" /></td></tr>
<tr><td><span class="imgswap"><a href="copyright.htm" style="display:block;"><img src="a1.gif" alt="copyright" /><b class="bb">Copyright</b></a></span></td>
<td valign="bottom">A few facts about copyright, and what you can and cannot do with other peoples' material.</td><td><i class="t-blu">Apr 2011</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="counterfeit.htm" style="display:block;"><img src="a1.gif" alt="fake" /><b class="bb">Counterfeit Devices</b></a></span></td>
<td valign="bottom">There are many counterfeit (fake) devices, and it pays you to be vigilant before buying anything that looks 'too cheap'.</td><td><i class="t-blu">Jan 2022</i></td></tr>
<tr><td><span class="imgswap"><a href="disclaimer.htm" style="display:block;"><img src="a1.gif" alt="disclaim" /><b class="bb">Disclaimer</b></a></span></td>
<td valign="bottom">The fine print. Please make sure that you read it thoroughly.</td><td><i class="t-blu">2002</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="philosophy.htm" style="display:block;"><img src="a1.gif" alt="philosophy" /><b class="bb">ESP Philosophy</b></a></span></td>
<td valign="bottom">My philosophy is based on factual (evidence based) information, and this article explains the basis behind all ESP articles and projects</td><td><i class="t-blu">May 2020</i></td></tr>
<tr><td><span class="imgswap"><a href="ethics.htm" style="display:block;"><img src="a1.gif" alt="ethics" /><b class="bb">Privacy</b></a></span></td>
<td valign="bottom">ESP's privacy and ethics policy</td><td><i class="t-blu">2002</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="spam.htm" style="display:block;"><img src="a1.gif" alt="spam" /><b class="bb">Spam/ Scams/ Security</b></a></span></td>
<td valign="bottom">Some things for you to consider, regarding the threats posed by the Internet</td><td><i class="t-blu">Feb 2021</i></td></tr>
<!-- general -->
<tr><td>&nbsp;</td>
</tr><tr class="tbldark"><td colspan="2"><img src="60px.gif" alt="" /><b>General Information</b><td><i><small>Update</small></i></tr>
<tr><td><img src="5px.gif" alt="" /></td></tr>
<tr><td><span class="imgswap"><a href="ads.htm" style="display:block;"><img src="a1.gif" alt="ads" /><b class="bb">Advertisements</b></a></span></td>
<td valign="bottom">Why does ESP have advertising on most of the pages?</td><td><br></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="contrib.htm" style="display:block;"><img src="a1.gif" alt="contribute" /><b class="bb">Contribute</b></a></span></td>
<td valign="bottom">If you have an article or project you would like published, let me know</td><td><i class="t-blu">Jun 2005</i></td></tr>
<tr><td><span class="imgswap"><a href="download.htm" style="display:block;"><img src="a1.gif" alt="download" /><b class="bb">Downloads</b></a></span></td>
<td valign="bottom">Various useful programs and spreadsheets to make your life easier</td><td><i class="t-blu">Dec 2004</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="faq.htm" style="display:block;"><img src="a1.gif" alt="faq" /><b class="bb">FAQs</b></a></span></td>
<td valign="bottom">Frequently Asked Questions. Check here first</td><td><i class="t-blu">Oct 2007</i></td></tr>
<tr><td><span class="imgswap"><a href="audiolink.htm" target="_blank" style="display:block;"><img src="a1.gif" alt="links" /><b class="bb">Links</b></a></span></td>
<td valign="bottom">to my favourite sites (plus additional and miscellaneous links)</td><td><i class="t-blu">Apr 2005</i></td></tr>
<tr class="tblgrey"><td><span class="imgswap"><a href="u-and-m.htm" style="display:block;"><img src="a1.gif" alt="misc" /><b class="bb">Useful &amp; Miscellaneous</b></a></span></td>
<td valign="bottom">Various things that don't seem to have a real home anywhere else</td><td><i class="t-blu">Apr 2010</i></td></tr>
<tr><td><span class="imgswap"><a href="why-diy.htm" style="display:block;"><img src="a1.gif" alt="why" /><b class="bb">Why DIY?</b></a></span></td>
<td valign="bottom">There are many reasons that people DIY, and there are also many benefits.</td><td><i class="t-blu">May 2008</i></td></tr>
</table>
<hr /><center>Dates shown in <i><b class="t-red">RED</b></i> indicate new or updated pages, typically within the last two months.<hr></center>
<table style="width: 100%;"><tr><td valign="top" class="t_11"><img src="esp-eot.gif" alt="ESP small"> &nbsp; projects and articles are free for personal use only.&nbsp; Any commercial use is strictly prohibited by international copyright laws without the express written consent of Rod Elliott.&nbsp; Images and text are &copy; 1999-2022 Rod Elliott (or as shown on each individual page), unless otherwise stated.&nbsp; Web and graphics design by Rod Elliott except for specific (non ESP) logos where used, whose copyright is the property of the respective owner(s).<br /><br />
<b>Links</b> - Anyone wishing to link to my pages may do so freely, but please make the main index page (<a href= "index.html">sound-au.com</a>) the sole link.&nbsp; Please do not link to individual pages or image files without asking first.&nbsp; This ensures that visitors get to see all that the site has to offer, and not just a part of it.<br /><br />
<img src="avatar.jpg" alt="avatar" /> &nbsp; Anyone wishing to do so may use this image for linking to the ESP site.</td>
<td align="right" valign="top"><img src="esp-vu1.gif" alt="Welcome to the ESP Home Page"></td>
</tr></table>
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<p align="center"><b><a href="https://sound-au.com/guestbook/view.php" target="_blank"><img src="guestbook.gif" alt="Guestbook" border=0>View and/or Sign the ESP
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<span class="t_11"><b>Note:</b> Requires Login - details ...<br />
Username ... <span style="color:red; font-style:italic;">guest</span>,&nbsp; password ... <span style="color:red; font-style:italic;">esp-gb</span></span><br /><br />
<i>Please do not use the Guestbook to ask questions.</i></b>
<br />Please Use English for your comments.&nbsp; Spam and inappropriate entries will be deleted.
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<hr /><br /><center><table cellspacing="5" cellpadding="5"><tbody><tr><td><img src="esp.jpg" alt="ESP Logo" height="81" width="215" align="bottom"></td><td><b>Elliott Sound Products</b><br />PO Box 233<br />Thornleigh NSW 2120<br />Australia<br /><a href="http://www.abr.business.gov.au/(dnyiwoev4zz0rpmi1ehcl355)/search.aspx?SearchText=77+069+281+668&amp;StartSearch=True" target="_blank" title="Click here to verify ESP's ABN status">ABN 77 069 281 668</a></td>
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<td width="80%"><center>This site comes to you from Sydney, Australia.<br><br>Thanks for visiting, and please sign the <a href="https://sound-au.com/guestbook/view.php" target="_blank">Guestbook</a>.<br />
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<p class="t_10b" align="center">ESP acknowledges the Traditional Custodians of the land upon which it operates, and recognises their continuing connection to land, water and community.&nbsp; We pay respect to Elders past, present and emerging.</p>
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<span class="t_10">The ESP logo is a registered trade mark of Elliott Sound Products.</span><br /><br />
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<tr><td valign="middle" class="t_13b">Total Visitors since Jan 2001 -&nbsp;
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