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 Elliott Sound Products
 Professional results for the Do-It-Yourself enthusiast Average >1,700 Visitors Per Day Since Jan 2001 

arrowPages Last Updated January 2020



Welcome to ESP, the home of DIY audio articles, projects and (some) shortform kits.  Audio is a wonderful hobby, and with DIY there is a huge scope to get the very best performance for a lot less money than otherwise.  DIY audio is fun and educational, and by building your own audio equipment, you get to learn electronics as well as build equipment that would cost a great deal more in the shops.  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.  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.  Purchase PCBs to gain access to even more information.  sound-au™ is a trade mark of Elliott Sound Products, and represents the site's primary focus (sound) and where I'm located (au - Australia).  It includes any other domains using the same prefix (regardless of url suffixes (e.g. '.com', '.net', etc.) that may be initiated or operational in the future).

IMPORTANT: Please see the disclaimer for information about these pages.

You should also read the Links Info to see ESP's revised links policy.  It explains why I use external links sparingly.

Please Note:   The site will be closed permanently by the end of this month (January)

ABC New Years Eve Concert Equaliser (Specific To Australia, but ...)
MOSFET Relay, suitable for speaker protection or mains switching
Low Frequency Boost And High Pass Filter For Speaker EQ
12V Float-Charge Battery Supply
Guitar 'Talk Box'
A Front Centre Channel Derived From Conventional Stereo
12V to P48 Phantom Power Switchmode Supply
12V to ±12V Switchmode Supply
Peak Voltage & Current Detector For Loudspeakers
Microphone Muting For Stage Mics (Includes Phantom Powered)
Audio Wattmeter (Measures True Power

Go to the Contact Page to send me an email.

This site can't exist without purchases from readers, but if you don't need to buy anything please consider a donation to ensure the site's survival.

Products & ServicesUpdate
>ProjectsComplete designs and ideas, with schematics and details of how each circuit works, including alternative uses (if applicable)  Jan 2020
>Project ListProjects 'Quick Access Links' To All Projects In Numerical Order  
>Purchase InformationProject Printed Circuit Boards and other ESP merchandise May 2017
>Price ListComplete Pricelist for all Products May 2019
>PayPal Shopping CartESP products in a convenient shopping cart (USD non-Australian purchases only) Nov 2018
>ContactSend an email to ESP
>AdvertisementsWhy does ESP have advertising on most of the pages?
Articles & InformationUpdate
>ArticlesAmplifier and power supply design, loudspeakers, electronics theory, beginner information, test and measurement, etc. NEW + Jan 2020
>App. NotesApplication notes, covering a wide range of different applications, not necessarily audio related Aug 2019
>Lamps & EnergyCovers not only lamps, but inrush current, external power supplies (aka 'wall warts'), power factor and other poorly understood topics. Jan 2017
>ValvesValve (vacuum tube) amplifiers, information and analysis. Includes a couple of valve-related projects Jan 2019
>The Class-A Amplifier SiteTCAAS (by Geoff Moss in the UK) is now hosted as an archive by ESP.   Please note:   Queries will be answered, but only if kept brief. Nov 2012
>ClocksThere is great synergy between my life-long career and my hobby - see why here. Dec 2019
>EducationCustomised projects for schools, technical colleges and universities 2003
>ConsultingESP also offers custom design and consulting services 2002
Navigation & Utilities
>Site MapComplete index of all available pages on this site
>Google™ SearchSearch the ESP website with Google™ Custom Search to find what you are looking for  
>Site SearchUse the Freefind Custom Search to find a particular article or project  
>ESP ForumDiscuss ESP projects and articles with other readers on the ESP Forum. When you sign up, you get an email to verify your address.
Requires 'Dual Login' - initial login details ...   Username ... forum,  password ... esp-forum
>ESP GuestbookView or Sign the ESP Guestbook (Note: Requires login - details ... Username ... guest,  password ... esp-gb ) 
Privacy, Ethics & Security Update
>CopyrightA few facts about copyright, and what you can and cannot do with other peoples' material. Apr 2011
>Counterfeit DevicesThere are many counterfeit (fake) devices, and it pays you to be vigilant before buying anything that looks 'too cheap'. Nov 2018
>DisclaimerThe fine print. Please make sure that you read it thoroughly. 2002
>ESP PhilosophyMy philosophy is based on factual (evidence based) information, and this article explains the basis behind all ESP articles and projects Oct 2018
>PrivacyESP's privacy and ethics policy 2002
>Spam/Scams/SecuritySome things for you to consider, regarding the threats posed by the Internet Sep 2019
General InformationUpdate
>ContributeIf you have an article or project you would like published, let me know Jun 2005
>DownloadsVarious useful programs and spreadsheets to make your life easier Dec 2004
>FAQsFrequently Asked Questions. Check here first Oct 2007
>Linksto my favourite sites (plus additional and miscellaneous links) Apr 2005
>Useful & MiscellaneousVarious things that don't seem to have a real home anywhere else Apr 2010
>Why DIY?There are many reasons that people DIY, and there are also many benefits. May 2008

Dates shown in RED indicate new or updated pages, typically within the last two months.
ESP small   projects and articles are free for personal use only.  Any commercial use is strictly prohibited by international copyright laws without the express written consent of Rod Elliott.  Images and text are copyright © 1999-2019 Rod Elliott, unless otherwise stated.  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).

Links - Anyone wishing to link to my pages may do so freely, but please make the main index page ( the sole link.  Please do not link to individual pages or image files without asking first.  This ensures that visitors get to see all that the site has to offer, and not just a part of it.

avatar   Anyone wishing to do so may use this image for linking to the ESP site.
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ESP LogoElliott Sound Products
PO Box 233
Thornleigh NSW 2120
ABN 77 069 281 668
Australia - I'm in Sydney
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