FREE POSTED MATERIALS

Newsletters, App Notes, Etc. below are posted free -
mostly our most recently-produced publications.
Older items, going back even to 1972, are generally
offered for-sale in paper.

Items in Blue are posted online only (for free) and are
not offered as part of paper-version sales.

Items in Red are posted online here AND are currently
(Sep. 2013) ALSO part of paper-version sales.

Items in Green are miscellaneous, often not currently printed,
or were never issued in paper (see descriptions).

So if you are printing your own hard copies from this
page, AND ordering some material from us as well,
wait to see if they are part of any hard copy sets you order.

Nearly all newsletters and app notes not posted are available
as paper copies - see Prices/Shipping.


Newsletters

Miscellaneous Complete Newsletters (Before EN#192)
As References and/or Requests:
In general Newsletters EN#1 - EN#191 are not posted
but available for-sale printed.

ELECTRONOTES 76 Vol. 9 Apr. 77 22 Pages
[HERE] Random Sources - Reference Requested For EN212

ELECTRONOTES 110 Vol. 12 Feb. 1980 22 Pages
[HERE] PWM - Reference Requested For EN216

ELECTRONOTES 113 Vol. 12 Feb. 1980 12 Pages
[HERE] Regarding Dual OTA Chips - Requested

ELECTRONOTES 129 Vol. 13 Sep. 1981 12 Pages
[HERE] Through-Zero VCO - Requested

ELECTRONOTES 141 Vol. 14 Sep. 1982 18 Pages
[HERE] Compensation of SV-VCF - Reference

From EN#192 on, Newsletters are On-Line Free.
Newsletters from EN#192 - EN#204 are currently
part of printed (for sale) "Everything Package".

Active Filtering Series:

ELECTRONOTES 192 Vol. 19 Feb. 2000 46 Pages
[HERE] Analog Signal Processing Notes Ch 3

ELECTRONOTES 193 Vol. 19 Mar. 2000 24 Pages
[HERE] Analog Signal Processing Notes Ch 4

ELECTRONOTES 194 Vol. 20 Apr. 2000 50 Pages
[HERE] Analog Signal Processing Notes Ch 5,6

ELECTRONOTES 195 Vol. 20 Jul. 2000 58 Pages
[HERE] Analog Signal Processing Notes Ch 7

ELECTRONOTES 196 Vol. 20 Dec. 2000 40 Pages
[HERE] Analog Signal Processing Notes Ch 8,9,10



Digital Filtering Series

ELECTRONOTES 197 Vol. 20 Apr. 2001 38 Pages
[HERE] Digital Signal Processing Notes Part 1 - Analog Corner : Neg. Gain VCVS

ELECTRONOTES 198 Vol. 20 June 2001 60 Pages
[HERE] Digital Signal Processing Notes Part 2 - Analog Corner : Measuring Q with Decrement

ELECTRONOTES 199 Vol. 20 Sep. 2001 34 Pages
[HERE] Digital Signal Processing Notes Part 3 - Analog Corner : Gain Adjust. via Thevenin


NEWSLETTERS EN#200 --> EN#204

ELECTRONOTES 200 Vol. 21 Dec. 2001 58 Pages
[HERE] Sampling Tutorial - Newsgroups - Troubleshooting

ELECTRONOTES 201 Vol. 21 Feb. 2002 24 Pages
[HERE] Additional Sampling Examples - Analog Corner: 2nd Order Envelope Generator

ELECTRONOTES 202 Vol. 21 Feb. 2002 28 Pages
[HERE] Active Comp Sallen-Key - Curious Triangular Window

ELECTRONOTES 203 Vol. 21 Jan . 2004 30 Pages
[HERE] Intuitive Polyphase Rate Changers - Bittersweet

ELECTRONOTES 204 Vol. 21 Aug. 2004 38 Pages
[HERE] Finite Word Length Effects – Part 1



-----Beginning EN#205 – Internet Only ------------

ELECTRONOTES 205 Vol. 22 Mar. 2008 36 Pages
[HERE] Polyphase on Demand - Bunched Sampling

ELECTRONOTES 206 Vol. 22 Feb. 2010 24 Pages
[HERE] Through Zero FM Theory

ELECTRONOTES 207 Vol. 22 Dec. 2011 31 Pages
[HERE] Kautz Functions

ELECTRONOTES 208 Vol. 22 Jan. 2012 24 Pages
[HERE] White Noise Curiosity – Non-Flat Spectrum

ELECTRONOTES 209 Vol. 22 Feb. 2012 27 Pages
[HERE] Finite Wordlength Effects – Part 2

ELECTRONOTES 210 Vol. 22 May 2012 23 Pages
[HERE] RC Lowpass Revisited

ELECTRONOTES 211 Vol. 22 July 2012 28 Pages
[HERE] Engineering Models

ELECTRONOTES 212 Vol. 22 Dec. 2012 19 Pages
[HERE] Bouncing Ball - DACs for Pseuddo-Random

ELECTRONOTES 213 Vol. 22 Jan 2013 58 Pages
[HERE] Musical Scales Revisited - Beating Revisited

ELECTRONOTES 214 Vol. 22 Feb. 2013 51 Pages
[HERE] Compensation of Ckt. Blocks for Op-Amp Poles - Revisited

ELECTRONOTES 215 Vol. 23 May 2013 23 Pages
[HERE] Revisited - Some VCF Ideas

ELECTRONOTES 216 Vol. 23 July 2013 26 Pages
[HERE] Revisited - Pulse-Width Modulation

ELECTRONOTES 217 Vol. 23 Sept 2013 17 Pages
[HERE] What About: Self-Frequency-Modulation

ELECTRONOTES 218 Vol. 23 Oct 2013 20 Pages
[HERE] Dispersion of "Tone Bursts" as a Means of Forming Musical Sounds

ELECTRONOTES 219 Vol. 23 Nov 2013 24 Pages
[HERE] Feedback Revisited - Gain Due To Feedback

ELECTRONOTES 220 Vol. 23 Jan 2014 25 Pages
[HERE] Reviewing the Current State of Music Synthesis

ELECTRONOTES 221 Vol. 23 Mar 2014 17 Pages
[HERE] Resonators and Friends - Prony with Noise

ELECTRONOTES 222 Vol. 23 June 2014 37 Pages
[HERE] FFT- Interpolation in Time and Frequency

ELECTRONOTES 223 Vol. 23 Nov 2014 40 Pages
[HERE] Time-Series Smoothing - A Review





Application Notes

Miscellaneous App Notes for Reference/Requests

ELECTRONOTES APP NOTES 14-18 1976 10 Pages Total
[HERE] App Notes on "Actually Building"

ELECTRONOTES APP NOTE 30 March 11, 1977 2 Pages
[HERE] More Clocking Oscillators for Digital IC's

ELECTRONOTES APP NOTE 67 Dec. 18, 1977 2 Pages
[HERE] Simple Triangle-Square Oscillator

ELECTRONOTES APP NOTE 71 Jan 18, 1978 2 pages
[HERE] Multi-Mode Filter Based on First-Order Low-Pass

ELECTRONOTES APP NOTE 103 Sept 18, 1978 2 pages
[HERE] Second-Order Step Response

ELECTRONOTES APP NOTE 121 Feb. 5, 1979 2 pages
[HERE] A State-Variable Configuration with Constant Peak response

ELECTRONOTES APP NOTE 160 Jan 11, 1980 2 Pages
[HERE] Efficient Calculation of the Fourier Series of Rectangular Functions

ELECTRONOTES APP NOTE 312 Dec. 1990 8 Pages
[HERE] An Intuitive Approach to FFT Algorithms

ELECTRONOTES APP NOTE 317 Jan 1992 16 Pages
[HERE] Polynomial Fitting for Sample-Rate Changing at Rational and Irrational Frequency Ratios

ELECTRONOTES APP NOTE 318 Feb 1992 2 Pages
[HERE] Time Domain Least Squares Low-Pass Filters

ELECTRONOTES APP NOTE 333 Oct. 1995 8 Pages
[HERE] Inverse Chebyshev Filters

ELECTRONOTES APP NOTE 334 Nov. 1995 8 Pages
[HERE] Elliptic Filters

ELECTRONOTES APP NOTE 335 Dec. 1995 14 Pages
[HERE] LP to HP Transformations

ELECTRONOTES APP NOTE 336 Jan. 1996 12 Pages
[HERE] LP to BP Transformations

ELECTRONOTES APP NOTE 337 Mar. 1996 37 Pages
[HERE] Generalized Freq. Sampling

App Note 345 ---> App Note 362 are BOTH online here
and part of Printed Package

ELECTRONOTES APP NOTE 345 Oct. 1997 6 Pages
[HERE] Improved S/N Ratio with First-Order Noise Shaping: An Example

ELECTRONOTES APP NOTE 348 Jul. 1998 9 Pages
[HERE] Contrasting Sinewave Generation in the Analog and Digital Cases

ELECTRONOTES APP NOTE 349 Aug. 1998 8 Pages
[HERE] Two Pole vs. Four-Pole Filters - The Issues

ELECTRONOTES APP NOTE 350 Nov. 1998 4 Pages
[HERE] Linear Phase - The Term Taken Outside

ELECTRONOTES APP NOTE 351 Sept. 2000 2 Pages
[HERE] Cascading Discrete and Continuous Holds

ELECTRONOTES APP NOTE 352 May 2002 12 Pages
[HERE] Errors in Frequency Shifters

ELECTRONOTES APP NOTE 353 Mar. 2003 3 Pages
[HERE] Gain and Time Constant of Integrators

ELECTRONOTES APP NOTE 354 May 2003 3 Pages
[HERE] Side-Tracking Filter

ELECTRONOTES APP NOTE 355 Oct. 2003 26 Pages
[HERE] Envelope Extraction with Hilbert Transformer

ELECTRONOTES APP NOTE 356 Oct. 2003 36 Pages
[HERE] Non-Uniform Sampling

ELECTRONOTES APP NOTE 357 Nov. 2003 12 Pages
[HERE] Considerations for a Noise Ordinance

ELECTRONOTES APP NOTE 358 Jun. 2004 16 Pages
[HERE] Perfect Reconstruction Filter Examples

ELECTRONOTES APP NOTE 359 Jul. 2004 3 Pages
[HERE] DFT Length Conversion

ELECTRONOTES APP NOTE 360 Aug. 2004 2 Pages
[HERE] Flat and Not-So-Flat Spectra

ELECTRONOTES APP NOTE 361 May 115, 2005 11 Pages
[HERE] Tuning Equations

ELECTRONOTES APP NOTE 362 Dec. 2005 25 Pages
[HERE] Customized Hamming Window



App Notes 363 and later are Online Only (free)

ELECTRONOTES APP NOTE 363 Mar. 2006 4 Pages
[HERE] Bit Saving with Noise Shaping

ELECTRONOTES APP NOTE 364 Apr. 5, 2006 7 Pages
[HERE] Fourier Series and DFT

ELECTRONOTES APP NOTE 365 Apr. 15, 2006 15 Pages
[HERE] Frequency Resolution with Few Samples

ELECTRONOTES APP NOTE 366 May 2006 18 Pages
[HERE] Equalization - Unfiltering

ELECTRONOTES APP NOTE 367 Jun. 2006 13 Pages
[HERE] Fixed Point Digital Sinewave Oscillators

ELECTRONOTES APP NOTE 368 Dec. 2006 18 Pages
[HERE] Minimum Norm Interpolation

ELECTRONOTES APP NOTE 369 Feb. 2007 28 Pages
[HERE] Two Dimensional Uniform Sampling

ELECTRONOTES APP NOTE 370 Mar. 2007 26 Pages
[HERE] Lifting – A Third Approach to Wavelets

ELECTRONOTES APP NOTE 371 Apr. 2007 17 Pages
[HERE] A 2D Wavelet Lifting Example

ELECTRONOTES APP NOTE 372 Jan. 2008 10 Pages
[HERE] Interpolation Error in Sinewave Tables

ELECTRONOTES APP NOTE 373 Feb. 2009 17 Pages
[HERE] Interpretation of DFT as One Frequency Sinusoidal Waveforms

ELECTRONOTES APP NOTE 374 Aug. 2010 14 Pages
[HERE] A View of Linear Frequency Invariant Systems

ELECTRONOTES APP NOTE 375 Nov. 2011 11 Pages
[HERE] Moving Averages and Single Sinewave Cycles

ELECTRONOTES APP NOTE 376 Dec. 2011 36 Pages
[HERE] Interpolation of Samples on a Square Lattice

ELECTRONOTES APP NOTE 377 Feb. 2012 13 pages
[HERE] False Ideas About Random Sequences

ELECTRONOTES APP NOTE 378 Mar. 2012 10 Pages
[HERE] A Program for a Flat White Noise

ELECTRONOTES APP NOTE 379 Jul. 2012 17 Pages
[HERE] Fun Plotting Your Own Global Warming Curves

ELECTRONOTES APP NOTE 380 Aug 5, 2012 11 Pages
[HERE] Fun With Lighting Switches–Simple But Sometimes Frustrating

ELECTRONOTES APP NOTE 381 Aug 10, 2012 6 Pages
[HERE] A Fun Analysis - Instrumentation Amplifier

ELECTRONOTES APP NOTE 382 Aug 20, 2012 11 Pages
[HERE] Fun With Ohm's Law - Maximum Power Transfer

ELECTRONOTES APP NOTE 383 Aug 25, 2012 6 Pages
[HERE] A Fun Problem Don Lancaster Dropped on Us Years Ago

ELECTRONOTES APP NOTE 384 Sep. 1, 2012 16 Pages
[HERE] Fun With Red Noise

ELECTRONOTES APP NOTE 385 Sep. 5, 2012 29 Pages
[HERE] Looking At Principal Component Analysis

ELECTRONOTES APP NOTE 386 Oct. 1, 2012 8 Pages
[HERE] Fun With A Round Earth

ELECTRONOTES APP NOTE 387 Oct. 10, 2012 6 Pages
[HERE] Fun With FFT Timing

ELECTRONOTES APP NOTE 388 Nov. 1, 2012 13 Pages
[HERE] Fun with Survey Maps

ELECTRONOTES APP NOTE 389 Nov. 15, 2012 5 Pages
[HERE] Fun With Probability Puzzles 1–The Monty Hall Problem

ELECTRONOTES APP NOTE 390 Nov. 20, 2012 4 Pages
[HERE] Fun With Probability Puzzles 2–False Positives

ELECTRONOTES APP NOTE 391 Nov. 25, 2012 4 Pages
[HERE] Fun With Probability Puzzles 3–The Girl Named Florida

ELECTRONOTES APP NOTE 392 Dec. 5, 2012 18 Pages
[HERE] Fun With Reverend Bayes - An Overview

ELECTRONOTES APP NOTE 393 Dec. 10, 2012 5 Pages
[HERE] The Bayes Equation Denominator

ELECTRONOTES APP NOTE 394 Jan. 20, 2013 8 Pages
[HERE] Node Voltages by Superposition

ELECTRONOTES APP NOTE 395 Mar. 30, 2013 24 Pages
[HERE] Averaging - and Endpoint Garbage

ELECTRONOTES APP NOTE 396 June 5, 2013 9 Pages
[HERE] Controlling a Low-Pass Peak Gain

ELECTRONOTES APP NOTE 397 June 15, 2013 9 Pages
[HERE] Clipping: Friend or Foe

ELECTRONOTES APP NOTE 398 July 20, 2013 4 Pages
[HERE] A Short Presentation of FFT (DFT) Interpolation

ELECTRONOTES APP NOTE 399 Sept 13, 2013 7 Pages
[HERE] The "Jung Trick" Applied to a Dual OTA

ELECTRONOTES APP NOTE 400 Dec. 5, 2013 4 Pages
[HERE] Square-Roots by Hand

ELECTRONOTES APP NOTE 401 Dec 22, 2013 8 Pages
[HERE] Yearly Moving Averages as FIR Filters

ELECTRONOTES APP NOTE 402 Jan 10, 2014 9 Pages
[HERE] Anomalies in Pseudo-Random Generators

ELECTRONOTES APP NOTE 403 Jan 27, 2014 14 Pages
[HERE] Spurious Correlation Due to Filtering (of Noise)

ELECTRONOTES APP NOTE 404 Feb 13, 2014 20 Pages
[HERE] Savitzky-Golay Smoothing

ELECTRONOTES APP NOTE 405 Feb 22, 2014 12 Pages
[HERE] Removing "Outliers" from Averaging

ELECTRONOTES APP NOTE 406 Mar 15, 2014 6 Pages
[HERE] Wiener Alternative to LMS Algorithm

ELECTRONOTES APP NOTE 407 Mar 30, 2014 16 Pages
[HERE] Inverting a Moving Average Operation

ELECTRONOTES APP NOTE 408 April 5, 2014 18 Pages
[HERE] Examples of Inverting of Smoothers

ELECTRONOTES APP NOTE 409 April 6, 2014 8 Pages
[HERE] Changing the Moving Average Length - A Recipe

ELECTRONOTES APP NOTE 410 May 6, 2014 4 Pages
[HERE] Fourier Map

ELECTRONOTES APP NOTE 411 May 20, 2014 16 Pages
[HERE] DTFT and Fourier Series: N Equations in N Unknowns

ELECTRONOTES APP NOTE 412 May 25, 2014 12 Pages
[HERE] More Fun with Red Noise

Note: AN-413 on FFT interpolation was posted here briefly. This was taken down and the text in its entirity was developed into EN#222 and greatly expanded. A new AN-413 on a different topic will appear.

ELECTRONOTES APP NOTE 413 July 30, 2014 24 Pages
[HERE] Notch Filtering - Some Notes

ELECTRONOTES APP NOTE 414 Aug. 15, 2014 11 Pages
[HERE] Step Response from Laplace Transform

ELECTRONOTES APP NOTE 415 Nov 1, 2014 15 Pages
[HERE] Do Random Sequences Need “Improving”?

ELECTRONOTES APP NOTE 416 Nov 7, 2014 11 Pages
[HERE] More Concerning Non-Flat Random FFT

ELECTRONOTES APP NOTE 417 Nov 22, 2014 13 Pages
[HERE] Time Domain Weighted Least Squares



WebNotes
WebNotes and Misc Topics, Online Only

WEBNOTE 1 8-15-2009 3 Pages
[HERE] Op-Amp Selections

WEBNOTE 2 8-15-2009 3 Pages
[HERE] Walsh Functions

WEBNOTE 3 8-21-2009 3 Pages
[HERE] 4-Pole VCF

WEBNOTE 4 8-30-2009 3 Pages
[HERE] Linearity

WEBNOTE 5 7-10-2012 3 Pages
[HERE] PROBLEMS WITH CFL LIGHT BULBS

WEBNOTE 6 9-26-2012 3 Pages
[HERE] NOTES ON THE INTUITIVE FFT

WEBNOTE 7 10-15-2012 6 Pages
[HERE] NOTES ON A "DERIVED" NEGATIVE SUPPLY

WEBNOTE 8 12-10-2012 4 Pages
[HERE] STILL PROBLEMS WITH CFL's

WEBNOTE 9 12-24-2012 4 Pages
[HERE] HOW THE FARMER CORRECTLY SAW SATURN

WEBNOTE 10 2-5-2013 24 Pages
[HERE] WHY ENGINEERS (SPECIFICALLY) SHOULD BE VERY SKEPTICAL
OF CLAIMS OF DANGEROUS MAN-MADE GLOBAL WARMING

WEBNOTE 11 2-22-2013 4 Pages
[HERE] Peer Reiew - Short Comments

WEBNOTE 12 8-7-2013 5 Pages
[HERE] ANOTHER ONE FOR THE CASEBOOK OF TROUBLE SHOOTING

WEBNOTE 13 8-27-2013 14 Pages
[HERE] FUN WITH GROUNDS AND NEUTRALS

WEBNOTE 14 12-2-2013 34 Pages
[HERE] COMPILED MOOG STUFF

WEBNOTE 15 12-20-2013 12 Pages
[HERE] The Alarming Concentration of CO2

WEBNOTE 16 12-21-2013 2 Pages
[HERE] Those CFL Bulbs - Still a Joke?

WEBNOTE 17 2-13-2014 16 Pages
[HERE] Simple Illustrations of Statistical Signfincance

WEBNOTE 18 2-15-2014 4 Pages
[HERE] Savitzky-Golay = Maximally Flat?

WEBNOTE 19 9-15-2014 4 Pages
[HERE] The Difference Between All-Pass and Notch

WEBNOTE 20 11-25-2014 7 Pages
[HERE] Continuing the Casebook of Troubleshooting



Misc. Items


"SUPPLEMENTS" NOT AVAILABLE IN PAPER

[S-007 DIGIVOX Users' Guide - 28 pages]
[S-016 Lab Prob and Examp in Active, V-C, and Delay Line Methods - 68 pages]
[Electronotes Supplement S-019 Exponential/Log - 6 pages]

ITEMS NEVER PUBLISHED!

[Theory and Practice of Musical Sound Synthesis - Section 1 - 23 pages]
[Theory and Practice of Musical Sound Synthesis - Section 2a - 18 pages]
[Theory and Practice of Musical Sound Synthesis - Section 2b - 10 pages]
[Theory and Practice of Musical Sound Synthesis - Section 2c - 12 pages]
[Theory and Practice of Musical Sound Synthesis - Section 2d - 7 pages]

SIX AES PAPERS
[Walsh Functions - 6 pages]
[Hadamard Transform - 5 pages]
[Exponential FM - 7 pages]
[Animation - 7 pages]
[Adapting Delay Comb Filter - 4 pages]
[Simple Hardware Pitch Extractor - 5 pages]


REQUESTED ITEMS:
Here we have posted specific items which were requested by readers.
Some are part of our printed package(s) as suggested by descriptions.

[Electronotes 62 Pg 12 Charlie Thompson OTA -1 pg]
[Electronotes 72 Timbre Modulator 2 pg]
[Electronotes 111 - Part - Ian's Oscillator - 1 pg]
[Electronotes 61 - Part - Slew-Limited S&H - 10 pg]
[Electronotes 85 - New VCF Ideas - 13 pg]
[Electronotes 97 - Bjorkman Brief Note - Better Method than EN#85 - 3 pg]
[ELECTRONOTES EN#87 Animator - 9 pg]
[ELECTRONOTES 37 Part Terry M. Exp Converters - 3 pg]
[Various Notes on Power Supplies - 18 pg]
[Universal Music from EN#35 - von Hoerner - 3 pg]
[ "Scales" from Musical Engineer's Handbook - 3 pg]
[Mus. Eng. HB Excerpt on PWM - 3 pg]
[EN#65 Part - Jan Hall Through-Zero VCO -3 pg]