The Audio Pages

Pages Last Updated September 2024

Welcome to ESP, the home of DIY audio and electronics articles, and PCBs for popular projects.  Electronics is a wonderful hobby, and with DIY there is a huge scope to get the best performance for less money than otherwise.  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.  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).

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

Asymmetrical Crossover Using P09 Board 18dB/Octave State-Variable Xover 6-Band Guitar Equaliser Protected DC Load Inductor Saturation Tester Guitar/ Bass Booster Circuits Low-Voltage Charge-Pumps Tape Head Preamp - NAB/IEC Versatile Clipping Indicator MOSFET Relay Using TPSI3052-Q1

Go to the Contact Page to send me an email.

Products & Services		Update
Projects	Complete designs and ideas, with schematics and details of how each circuit works, including alternative uses (if applicable)	Sep 2024
Project List	Projects 'Quick Access Links' To All Projects In Numerical Order	Aug 2024
Purchase Information	Project Printed Circuit Boards and other ESP merchandise	Jul 2024
Price List	Complete Pricelist for all Products - Includes postage to most regions (tracked airmail is used for all orders.	Jul 2024
PayPal Shopping Cart	ESP products in a convenient shopping cart (USD non-Australian purchases only)	Jul 2024
Contact	Send an email to ESP
Articles & Information		Update
Articles	Amplifier and power supply design, loudspeakers, electronics theory, beginner information, test and measurement, etc.	Sep 2024
App. Notes	Application notes, covering a wide range of different applications, not necessarily audio related	May 2022
Lamps & Energy	Covers not only lamps, but inrush current, external power supplies (aka 'wall warts'), power factor and other poorly understood topics.	Jul 2020
Valves	Valve (vacuum tube) amplifiers, information and analysis. Includes a couple of valve-related projects	Jan 2019
The Class-A Amplifier Site	TCAAS (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
Clocks	There is great synergy between my life-long career and my hobby - see why here.	Dec 2019
Education	Customised projects for schools, technical colleges and universities	2003
Consulting	ESP also offers custom design and consulting services	2002
Navigation & Utilities
Site Map	Complete index of all available pages on this site
Site Search	Use the Freefind Custom Search to find a particular article or project
Google™ Search	Search the ESP website with Google™ Custom Search to find what you are looking for
ESP Forum	Discuss 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 Guestbook	View or Sign the ESP Guestbook (Note: Requires login - details ... Username ... guest,  password ... esp-gb )
ESP Gallery	Have a look at some of the outstanding builds using ESP boards - Contributions welcome!	Feb 2022
Privacy, Ethics & Security		Update
Copyright	A few facts about copyright, and what you can and cannot do with other peoples' material.	Apr 2011
Counterfeit Devices	There are many counterfeit (fake) devices, and it pays you to be vigilant before buying anything that looks 'too cheap'.	Jan 2022
Disclaimer	The fine print. Please make sure that you read it thoroughly.	2002
ESP Philosophy	My philosophy is based on factual (evidence based) information, and this article explains the basis behind all ESP articles and projects	May 2020
Privacy	ESP's privacy and ethics policy	2002
Spam/ Scams/ Security	Some things for you to consider, regarding the threats posed by the Internet	Feb 2021
General Information		Update
Advertisements	Why does ESP have advertising on most of the pages?
Contribute	If you have an article or project you would like published, let me know	Jun 2005
Downloads	Various useful programs and spreadsheets to make your life easier	Dec 2004
FAQs	Frequently Asked Questions. Check here first	Oct 2007
Links	to my favourite sites (plus additional and miscellaneous links)	Apr 2005
Useful & Miscellaneous	Various 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

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 © 1999-2022 Rod Elliott (or as shown on each individual page), 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 (sound-au.com) 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.   Anyone wishing to do so may use this image for linking to the ESP site.

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Elliott Sound Products PO Box 233 Thornleigh NSW 2120 Australia ABN 77 069 281 668

This site comes to you from Sydney, Australia. Thanks for visiting, and please sign the Guestbook.

ESP acknowledges the Traditional Custodians of the land upon which it operates, and recognises their continuing connection to land, water and community.  We pay respect to Elders past, present and emerging.

The ESP logo is a registered trade mark of Elliott Sound Products.

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