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All Material Copyright © 1998-2013 Rod Elliott (ESP)
Copyright For Each Individual Article Is Shown At The End Of Each Page
Page Last Updated - September 2013

Indexes
Main Entry Page
Main Index
Articles Index
Projects Index



Articles
Active Filters
Active Vs. Passive Crossovers
A-B Blind Comparator
ABX Test Set
AM Radio - Wideband/ Hi-Fi
Amplifier Basics - Intro
Amplifier Basics - Part 1
Amplifier Basics - Part 2
Amplifier Basics - Part 3
Amplifier Basics - Part 4
Amplifier Basics - Part 5
Amplifier Basics - Part 6
Amplifier Bridging
Amplifier Design
Amplifier Efficiency
Amplifier Troubleshooting
Amplifier Troubleshooting - Part 2
Amplifier Protection
Amplifier Sound

Baffle Step EQ
Balanced Circuits
Beginners Guide to Components
Bi-Amplification (Part I)
Bi-Amplification (Part II)
Bucking Transformers
Bulletin Boards
Buying Electronic Components

Cables - Part 1
Cables - Part 2
Cables - Part 3
Cables - Part 4
Cables - Part 5
Cables - Part 6
Cable Impedance
Cable Information
Capacitors in Depth
Compound (Sziklai) Vs. Darlington pairs
Commercial Sound (70-100V Lines)
Coupling Capacitors

CD Vs. SACD Vs. DVDA
Class-A Amplifiers
Class-A Amplifiers - Part 2
Class-D Amplifier Theory & Design
Class-G Amplifiers
Compliance Scaling Loudspeakers
Compression in Audio
Counterfeit Transistors
Current Sources, Sinks & Mirrors

Derived (Subtractive) Crossover Networks
Designing with Opamps - Part 1
Designing with Opamps - Part 2
Designing with Opamps - Part 3
Distortion & Negative Feedback
Doppler distortion in Loudspeakers
DSP - Digital Signal Processing in Audio

Earthing (Grounding) Techniques
Electronics Tools
Electrocution & How To Avoid It
External Power Supplies - New Regulations

Frequency, Amplitude and dB
Fusing & Circuit Protection

Glossary of Terms
Guitar Amps - Repair or Replace

Heatsinks
Heatsink - ESP Extrusion
Heatsinks - DIY
HEXFET Audio Amplifiers
High Speed Opamps

Impedance
Impedance Effects
Instrument Amplifiers
Incandescent Lamp Ban
Inrush Current Mitigation
Introduction to Potentiometers

JLL Hood Class-A Amp
Linkwitz Transform
Loudspeaker Power vs. Efficiency

Meters, Multipliers & Shunts
Microphones
Miscellaneous Components
Mixing Principles, Active & Passive
MOSFET Relays
Myths in Audio

Noise in Audio Circuits
Neville Thiele Method (NTM™) Crossovers

Opamp Alternative Circuits

Passive Crossovers
Patents - General Information
Phase Angle Vs. Transistor Dissipation
Phase Correction - Myth or Magic?
Phase, Time & Distortion
Power Amplifier Clipping Behaviour
Power Ratings
Power Supply Design

Reverberation Tanks

Review of BE Valve Amplifier

Satellites & Subs (QB5 Alignment)
Safe Operating Area (SOA)
(The) Subwoofer Conundrum
Series vs. Parallel Crossovers
Small Satellite Speaker (Part 1)
Small Satellite Speaker (Part 2)
Small Satellite Speaker (Part 3)
Sound Impairment Monitor
Sound - Illusion?
Speaker Failure
State of Manufacture

Thiele-Small Parameters
Transistor Matching
Transistor listing
Transformers - Part 1
Transformers - Part 2
Transformers - Part 3
Transformers - The Variac
Triamped Speaker System - Part 1
Triamped Speaker System - Part 2

Voltage Dividers & Attenuators
Volume Filling Reflex Enclosures

What Makes Tweeters Blow
What Is Hi-Fi
Why Do It Yourself?
Wiring A Power Supply
Waveguides, Part 1
Waveguides, Part 2
Waveguides, Part 3



Valves
Valve Articles Index
Valve Amps - Do they really sound different?
Valve intro - types, terminology, etc.
Bias and Gain
Valve Stage Analysis
Design Considerations - Part 1
Design Considerations - Part 2
Low Distortion Preamps
Valve Myths



Application Notes
Application Notes Index
Precision Rectifiers
Analogue Metering Amplifiers
High Power Led SMPS
Car Dome Light Extender
Zero Crossing Detectors
Ultra-Simple SMPS
Transistor Assisted Zener
Using Zener Diodes
DC Motor Speed Controller
DC Motor Speed Controller (II)
2-Wire/4-Wire Converters



Purchases
Ordering Info
Price List
Order Form
Encrypted Order Program
Downloadable price file for above
Fully Built Modules
Class-D amplifier
Guitar Amp Module
Digital Flash Module
VP-103 Valve Preamp
PCB Catalogue (HTML)
Paymate Details
PayPal Details
Western Union Details
Dead Letters



Clocks
Clock Components
Clock Motors
Kundo Battery Clocks
Old Synchronous Motors
Frequency Changer
Build a Synchronous Clock
Free Pendulum Clock
1.5V Mains Supply
Magnet Charger
Simple Flux Meter
Spark Quench Circuits
1 second timebase
Fast Demagnetiser

Clock Links



Gallery
L-R Crossover
L-R Crossover (2)
Reader Feedback - Part 1
Reader Feedback - Part 2



Downloads
Download Index
Encrypted Order Form (ZIP)
Semiconductor Data (EXE)
Heatsink Calculator (ZIP)
MFB Filter Calculator (EXE)
Help Kill Spam (ZIP)
LED VU Design (ZIP)
Loudspeaker Parameters (ZIP)
Crossover Design (ZIP)
Linkwitz Transform Design (ZIP)
Reminder Program (EXE)
Stores Program (ZIP)
PC Timer Program (EXE)
Crossover Calculator (EXE)
Heatsink Design (XLS)
Transformer analysis program (ZIP)
Transformer analysis spreadsheet (ZIP)
Transformer design program (ZIP)
World Time Clock (EXE)



Humour
Humour Index
Humour - Part 1
Humour - Part 2
Murphy's Laws
A Space Oddity
If Your O/S Were an Airline
Waltzing Matilda Explained
Monty Python
Dynamic Range Vs, Ambient Noise
Satcure Products



Miscellaneous
Hall of Shame
Home Page
Main Index
Main Links Page
Miscellaneous Links
Mad As Hell - Part 1
Mad As Hell - Part 2
Mad As Hell - Part 3
Mad As Hell - Part 4
ESP Ethics Policy
About ESP Site
Contact the Author
Submit Your Material
Contracting Details
About the Author
Custom Projects for Education
Frequently Asked Questions
Spam, Scams & Security
Scams - how they work
Your on-line security
Spam, Spam, Spam, Spam
Disclaimer
Search Page
Contribute Project/ Article


Lamps, PSUs, Energy
Lamps - Incandescent, etc.
Fluorescent Lamps
LED Lighting
LED Lighting - Thermal Design
ESL Lamps
Sulphur Plasma Lamps
Dimmers
Electronic Transformers
External Power Supplies
Induction Fluorescent Lamps
Inrush Current Protection
Power Factor Correction
Power Saver Scam
Capacitance, Inductance & Non-Linear Loads
Wind Turbine Introduction
Wind Turbine Noise



Projects
Projects Index
Projects Index by Category
Project List in Numerical Order

01 Better Volume Control
02 Simple Preamp
02 60W Power Amp
04 Power Amp Supply
05 Preamp Power Supply
05A Updated Preamp Power Supply
06 Phono Preamp
07 Discrete Opamp
08 3rd Order Electronic Crossover
09 Linkwitz-Riley Crossover

10 Class-A Amplifier
11 Pink Noise Generator
12 Current Feedback Power Amp
12A El-Cheapo Power Amp
13 Low Noise Preamp
14 Power Amp Bridging
15 Capacitance Multiplier
16 Audio Millivoltmeter
17 A-Weighting Filter
18 Surround Decoder
19 50W IC Power Amp

20 Simple Bridge Adaptor
21 Stereo Width Controllers
22 Audio Oscillator
23 Clipping Indicator
24 Headphone Amplifier
25 Phono Preamps For All
26 Digital Delay
26A PT2399 Digital Delay
27 Guitar Amp (Original)
27 Guitar Amp (Pt 1)
27 Guitar Amp (Pt 2)
28 Quasi-Parametric EQ
29 Tremolo Unit

30 Mixing Desk (Pt 1)
30 Mixing Desk (Pt 2)
30 Mixing Desk (Pt 3)
30 Mixing Desk (Pt 4)
30 Mixing Desk (Pt 5) 31 Transistor Tester
32 Car Audio Preamp
33 Speaker Protection and Mute
34 Spring Reverb Unit
35 Direct Injection Box
36 DoZ Class-A Amplifier
37 DoZ Preamp
38 Auto Power-On
39 Soft Start Power Switch
3A 60W Hi-Fi Power Amp
3B 25W Class-A Power Amp

40 Load Sensing Auto Switch
41 Opamp Design & Test Board
42 Thermo-Fan Controller
43 Simple DC Split Supply
44 Dual Lab Supply
45 Bass Compressor
46 Thermal Shutdown
47 VOX AC30 Simulator (withdrawn)
48 Sub Equaliser
49 Guitar Vibrato

50 Mic Circuit Tester
51 Balanced Line Drivers
52 Distortion Analyser
53 Power Limiter
54 Low Power FM Transmitter
55 PPM and VU Meters
56 Variable Amp Impedance
57 Sound Impairment Monitor
57 Speaker Measurement Set
59 Self Oscillating Amp

60 LED VU Meter
61 (Withdrawn)
62 Lighting System (Pt 1)
62 Lighting System (Pt 2)
62 Lighting System (Pt 3)
62 Lighting System (Pt 4)
62 Lighting System (Pt 5)
62 Lighting System (Pt 6)
63 MFB Filter
64 Instrument Graphic EQ
65 Strobe Light
66 Balanced Mic Preamp
67 Audio Peak Limiter
68 Sub Power Amp
69 Low power +/-12V supply

70 DoZ Headphone Amp
71 Linkwitz Transform Circuit
72 20W IC Stereo Amp
73 PC Sound System
74 RF Probe
75 Constant Q Graphic EQ
76 Opamp Based Power Amp
77 High Current 13,8V Supply
78 2nd Order Electronic Crossover
79 Current Sense Power Switch

80 Reverse RIAA Equaliser
81 12dB L-R Crossover
82 Loudspeaker Test Box
83 MOSFET Follower Amplifier
84 1/3 Octave Sub Equaliser
85 S/PDIF DAC
86 Mini Audio Oscillator
87 Balanced Transmitters & Receivers
88 Audio Preamp
89 Car Switchmode Supply

90 Dimmer Polarity Reversal
91 78RPM Phono EQ
92 Guitar and Bass Sustain
93 Recording & Measuring Mic
94 Universal Preamp Mixer
95 Low Power -VE Supply
96 48V Phantom Supply
97 Hi-Fi Preamp
98 Auto Charger for Battery Hi-Fi
99 36dB/ Octave Subsonic Filter

100 Headphone Adaptor for Amplifiers
101 200W MOSFET Power Amplifier
102 Simple Pre-Regulator
103 Subwoofer Phase Control
104 Preamp/ Crossover Mute Circuit
105 Build an Electrostatic Loudspeaker (ESL)
105-2 Electrostatic Loudspeaker - Part 2
105-3 Electrostatic Loudspeaker - Part 3
106 hFE Tester for Transistors
107 Phase / Polarity Reversal Switching
108 Switchmode PSU Protection
109 Headphone Amp

110 IR Remote Control
111 PIC Speaker Protection
112 Dummy Head Microphone
113 Hi-Fi Headphone Amp
114 Class-D (PWM) Power Amp
115 GainClone Amplifier (Part 1)
115 GainClone Amplifier (Part 2)
116 Class-D Subwoofer Amp
117 1.5kW Power Amplifier
118 Ultra Simple PC Peripheral Switch
119 Component Signature Analyser

120 Crowbar Speaker Protection
121 Reading Inductance
122 Ultra-Simple Mic Preamp
123 18dB/Octave Crossover
124 Dummy Load
125 4-Way 24dB/Octave Crossover
126 10A, 12V PWM dimmer/ speed controller
127 Two Channel TDA7293 power amplifier
128 Analogue VU Meter Bridge
129 Matrix Mixer

130 Inverse A-Weighting Filter
131 Light Activated Switch
132 Air Bearing Tonearm
133 PA-PC Audio Interfaces
134 4mA Current Loop Microphone
135 Phase Correlation Meter
136 Real-Time Audio Analyser
137 Bi-amped PA Amplifier
138 Mains Over/ Under Voltage Cutout

ABX ABX Comparator
X A-B Switch Box

Project Suggestions

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