CordellAudio.com - Build a High Performance THD Analyzer

Home
About Me Contact Site Map
Books
Audio Circuits and Systems Audio Power Amplifiers SPICE Models Tutorial Simulations Download LTspice
Power Amplifier Design
A MOSFET Power Amplifier with Error Correction The C70 35 wpc KT88 Vacuum Tube Amplifier The Super Gain Clone™ Understanding Distortion The Role of Negative Feedback Why I Prefer MOSFETs The DH-220C MOSFET Power Amplifier
Audio Instrumentation
Build a THD Analyzer The Distortion Magnifier A Twin-tone/Multitone IM Signal Source A Peak/Average Power Level Meter A Level-Matched Speaker/Amplifier A-B Switch QuantAsylum QA403 Tutorial
Loudspeakers
The Morel M3 The Athena Active Loudspeaker EQSS™ The EQSS™ Subwoofer Active Loudspeakers Powerpoint
Preamplifiers
VinylTrak™ Preamp Dynamic Microphone Preamp Condenser Microphone Preamp VCA-based Faders and Panning Pots
Published Papers
Another View of TIM A Fully IN-Band Multitone Test Build a THD Analyzer Interface Intermodulation Distortion Phase Intermodulation Distortion A MOSFET Power Amplifier with Error Correction
SPICE
SPICE Models Tutorial Simulations Download LTspice
JFETs
LSK489 Application Note
HE2007
Abstracts Schedule Show Report Pictures
Services
Audio Design Consulting Measurement Services Licensing & Patents

Build a High Performance THD Analyzer

Audio
Volume 65, July, August, September 1981

This three-part construction article described a high performance THD analyzer that an individual could build affordably. THD analyzers are traditionally expensive and out of reach for the average DIY audio enthusiast, yet they are indispensable in designing audio power amplifiers and other equipment. The unit described in this construction article is every bit as sensitive as the best commercial THD analyzers, with a THD+N measurement floor below 0.001 percent out to 20 kHz.

Click here to view PDF