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 Elliott Sound Products Application Note Index 

Page Last Updated - August 2019

These application notes are presented as a means of making useful circuits and sub-circuits available, along with some information about how they work, test results (where applicable), etc.  Some of these are adapted from the projects page, as their application has the potential to be broader than indicated in the project itself.

Few of these (already published or yet to be published) are original, although some have been adapted and changed to the extent that the original may barely be recognisable.  As always, if you have a good circuit idea feel free to submit it (along with any reference material).

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ESP Application Notes

AN-001Precision rectifiers. Half and full wave types for signal processing, instrumentation, etc.Feb 2010 
AN-002Analogue metering amplifiersJun 2005 
AN-003Simple switchmode Supply for Luxeon Star LEDsJun 2005 
AN-004Car dome light extender - make the dome light stay on for a while after the car door is closedJun 2005 
AN-005Zero crossing detectors and comparators, Unsung heroes of modern electronics designJan 2011 
AN-006Ultra Simple 5V Switchmode Regulator - voltage regulator version of AN-003Jun 2005 
AN-007High Power Zener Diode, boosting normal zeners to allow high power usageJun 2005 
AN-008How to Use Zener Diodes, the things the data sheets do not always tell youJun 2005 
AN-009Versatile DC motor speed controller (and where to get high power geared motors)Jul 2005 
AN-009/2DC motor speed controller (Part 2)Jul 2005 
AN-0102-Wire/ 4-Wire converters/ Hybrids (Telephone)Feb 2009 
AN-0114-20mA Current Loop Signalling InterfacesFeb 2011
AN-012Peak, Average and RMS MeasurementsJul 2016 
AN-013Reverse Polarity Protection - A collection of different ways to protect electronic circuitsJan 2017
AN-014Peak Detection CircuitsMar 2017 
AN-015Input Overvoltage Protection CircuitsApr 2018
AN-016Measuring Ultra-High Resistance With Existing (Cheap) EquipmentApr 2019
AN-017DC Detectors For Loudspeaker Protection (also usable as zero-crossing detectorsJun 2019
AN-018Ultra-Low Leakage Diodes - Not as hard to find as you might thinkAug 2019

Manufacturer Application Notes *

AN-166Basic Feedback Theory (Philips Semiconductors)Dec 1988 
AN-1000Mounting Guidelines for the SUPER-220 - Transistor Mounting Techniques (IR)Unknown 
AN-72A Seven-Nanosecond Comparator for Single Supply Operation (Linear Technology)May 1998

Each application note may have one or more 'flags'.  These indicate the status of the app. note, and are as follows ...

dd Month YYYYThe design (or update) is less than 2 months old (or thereabouts)
!! Mains !!Mains wiring is involved, and is potentially dangerous - heed all warnings ! Note that other app. notes may also need a power supply which also requires mains wiring
DateThe page was added or updated on the date shown
The appnote has had an update since original publication
Link to external site

* Manufacturer Application Notes will most commonly be links to external sites, although a small number may be included on the ESP site.  These remain the intellectual property of the original author/manufacturer in all cases.

ESP reserves the right to change or update application notes, projects and articles without notice, so it is important to be aware that a change may have been made.  You should always watch for updates of previously published items. Do not build any of the circuits presented here without checking for updates first.  An 'update' symbol indicates a recent addition or update.

Note Carefully

Please see the ESP disclaimer for important information about this site and the contents thereof.

Where applicable, mains wiring should be carried out by suitably qualified persons only.  Under no circumstances should any reader construct any mains operated equipment unless absolutely sure of his/her abilities in this area.  The author takes no responsibility for any injury or death resulting from, whether directly or indirectly, the reader's inability to appreciate the hazards of household mains voltages, lack of knowledge of correct wiring practices, etc. Please read the disclaimer now if you have not done so already.

Please note that these application notes are not supported, so please do not ask for assistance or explanations. All circuits are checked for accuracy, but it is not guaranteed that they will work for your application.  In the same way that you might find application notes published by semiconductor (or other) manufacturers, you don't e-mail them for help and the same applies here.

Submissions are welcome, but unlike magazines where they may offer prizes or cash for submissions, all I can offer is wide distribution of your idea.  Please ensure that any submission is accompanied by full disclosure of references - do not try to claim the work of others as your own.

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Copyright Notice. Application Notes referred to herein, including but not limited to all text and diagrams, are the intellectual property of Rod Elliott and/or the person or company whose work is referenced in the description, and are Copyright © 2005-2018. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. The author / editor (Rod Elliott) grants the reader the right to use this information for personal use only, and further allows that one (1) copy may be made for reference. Commercial use in whole or in part is prohibited without express written authorisation from Rod Elliott and/or the owner of the copyright in the case of submitted articles or material adapted from manufacturer supplied information.