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An ultra low-distortion oscillator with THD below -140 dB
http://www.janascard.cz/PDF/An%20ultra%20low%20distortion%20oscillator%20with%20THD%20below%20-140%20dB.pdf
An ultra low-distortion oscillator with THD below -140 dB Vojtěch Janásek, www.janascard.cz (Actualized 9/2020, 2/2021) Abstract: ADC circuits that resolve signal into 20 or more bits need a low-noise signal source for measuring parameters such as harmonic distortion or effective number of bits. A notch filter
An Ultra Low Distortion Audio Test Oscillator - Internode
http://www.users.on.net/~endsodds/ao.htm
Low THD Audio Oscillator. An Ultra Low Distortion Audio Test Oscillator. This project was published in the March 2010 issue of the Australian magazine "Amateur Radio", and uses a unique circuit and cheap readily available components to …
Ultra-Low Distortion Sinewave Oscillator
https://sound-au.com/project174.htm
Introduction. As discussed in the article ( Sinewave Generators ), although a sinewave is the simplest possible waveform, it is also one of the hardest to generate in pure form. Any impurity represents distortion, and that means added harmonics that make very low distortion measurements impossible. If an amplifier under test has a distortion of 0.01%, the oscillator …
ultra-low distortion audio oscillator | diyAudio
https://www.diyaudio.com/community/threads/ultra-low-distortion-audio-oscillator.141596/
ultra-low distortion audio oscillator. recently i've gotten the itch to map out a design for a circuit/system which would measure the THD+N and frequency response of a homebrew amplifier. the main design goals are low cost, practical assembly, and relatively good performance. essentially, a tuneable harmonic oscillator sends a signal through the amp under …
Ultra low distortion audio oscillator the neverending ...
https://amplifier.cd/Technische_Berichte/Amplifier_reiner_Sinus/amplifier_clean_sine.htm
It is a selctive amp with 180dB at 10kHz. A oscillator well suitable for distortion measurement on opamps and many other audio application. Important a precise builded up design. The ground connections must be state of the art to reach the possible low distortion at all. Wide groundplanes on different layers with low coupling under Ohm's law.
Super Low Distortion Ultra Pure Audio Oscillators ...
https://proaudiodesignforum.com/forum/php/viewtopic.php?t=887
Janasek Ultra Low Distortion Oscillator The Janasek oscillator uses the LME49710. It's schematic is the most easy to follow. If you look at the Janasek control loop you'll see that the NSL32SR3 is in parallel with an 18Ω resistor. The delta-R of the NSL32SR3 is about 150-60Ω at an LED current ranging from 5-20 mA. The net delta-R is only about 2Ω.
Tektronix SG505 low-distortion audio oscillator - AUDIO ...
https://blog.audioworkshop.org/tektronix-sg505-low-distortion-audio-oscillator/
The Tektronix SG505 instrument is an ultra-low distortion and low-nose oscillator intended for testing of audio grade electronic products. This one came to my possession as a non-working unit and I set-out to fix it. Front view. Quick specifications: Frequency range : 10Hz to 100kHz. Output level : +10dBm to -60dBm into 600 Ohm load
Low-distortion Audio-range Oscillator | Page 4 | diyAudio
https://www.diyaudio.com/community/threads/low-distortion-audio-range-oscillator.205304/page-4
The frequency ranges are limited to three, 100 Hz to 250 Hz, 1k to 2.5 kHz, 10 k to 25 kHz. It is a little touchy to tune but it was good enough to measure 0.004 % distortion and noise at 1 kHz on the Oscillator test circuit that I made. I have attached a picture of the Distortion Measuring unit.
Low distortion audio oscillator board/kit - are any still ...
https://www.eevblog.com/forum/testgear/low-distortion-audio-oscillator-boardkit-are-any-still-available/
Low distortion audio oscillator board/kit - are any still available? There used to be one or two of these available - fixed frequency oscillator boards with low distortion at a very reasonable price. Some were kits and some were pre-stuffed boards ready to …
Other - Low Distortion Oscillator - Trout Underground
https://troutunderground.com/Other-Low-Distortion-Oscillator/
HP 239A Ultra Low Distortion Oscillator Tested in good working and physical condition. See photos. Any additional equipment in photos is not included. The 239A covers from 10 Hz to 110 kHz in 4 overlapping decade ranges with 2 digit resolution. The output level is variable from 1 millivolt to 3.16 Vrms into 600 ohms. Powered by The free listing tool.
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