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How do i create second harmonic distortion?
How do i create second harmonic distortion?
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Old 5th November 2017, 06:46 PM   #21
Bigun is offline Bigun  Canada
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How do i create second harmonic distortion?
I don't like op-amps because there's no fun in 'em. A passive option is to use a small transformer and add some dc-bias current through it to control where the signal sits on the BH curve - voila, adjustable 2nd harmonic distortion.
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Old 5th November 2017, 06:46 PM   #22
PMA is offline PMA  Europe
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I am using Keith Howard's adddistortion

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Old 5th November 2017, 06:47 PM   #23
Mooly is offline Mooly  United Kingdom
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How do i create second harmonic distortion?
Quote:
Originally Posted by filthyone View Post
I tried in audacity, i couldn't find that specific "distortion" plugin, but i tried "diode processor" using half wave settings. To my ears, at low levels the distortion is not that bad, it's kind of bearable. At higher levels it just sounds distorted, and at full wave settings it is just unbearable.
I alse tried "harmonic generator" with similar results. Odd order harmonics just sound harsh and evil, even order harmonics are more bearable (especially low order, the higher you go in order, the worse it gets) but still sound distorted/bad.

I'm already wondering, who and why would prefer a slightly distorted signal over a nice and clean one? (except maybe guitar players)
Its installed by default although I am running the latest version after clean installing W10
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Old 5th November 2017, 07:44 PM   #24
bwaslo is offline bwaslo  United States
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How do i create second harmonic distortion?
Quote:
Is there a circuit that adds a nearly constant proportion of 2nd harmonic?
Supposedly a pure square-law device would do that (I think). But what would be the point, no audio amplifier acts like that? Their "percent distortion" as found in data sheets or ad literature is typically just some arbitrary % value they chose to define their "rated power" at. At low levels the distortion is very, very much lower. You can't practically find out what "playing at 5% distortion sounds like" (for total harmonic or any specific order) because with hifi amps that only happens at peaks of sinewaves, so it is more or less an undefined condition with music.

Badly designed class AB or B amps that have crossover distortion being the exception of course. With those % distortion can go up at lower levels. Those are pretty much extinct any more though.
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Old 5th November 2017, 07:55 PM   #25
Pano is online now Pano  United States
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How do i create second harmonic distortion?
Where's Wavebourne? . He built a distortion adder years ago and found that no one liked it their system.
I'm not too sure about this Euphonic/Euphoric distortion so many posters claim that "those people" like.
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Old 5th November 2017, 09:02 PM   #26
Bigun is offline Bigun  Canada
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How do i create second harmonic distortion?
I added distortion to a couple of my amps, didn't like it either so took it out. It was a big surprise for me that I actually like high feedback low distortion amps ! But for some music, a SET amp does wonders. Go figure.
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Old 5th November 2017, 09:05 PM   #27
PMA is offline PMA  Europe
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Euphonic distortion is a nonsense, however it sometimes happens that people prefer a more distorted music file to original file in a blind test.
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Old 5th November 2017, 09:06 PM   #28
MarcelvdG is offline MarcelvdG  Netherlands
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No-one seems to have mentioned the word translinear yet.

Taking advantage of the exponential characteristics of bipolar transistors and using loops of transistor BE-junctions, you can make just about any non-linear function you want to make. This is known as the translinear principle, and it was invented by Barrie Gilbert.

For example, the attached schematics should produce an x^1.5 type of distortion, just like the voltage to current characteristics of valves do according to Child's law (which no valve follows accurately, though). Mind you, I haven't tried either of these schematics. The left and right stacks of transistors must have equal numbers out of IC1 and equal numbers out of IC2. The CA3046 can be replaced with an LM3046, which is still available although it is also going out of production.

When you leave out Q2 and Q6 (and reduce R4 to 6.8 kohm in the 9 V version), it becomes a second-order distorting circuit. You then only need one LM3046 per channel.

R1A and R1B are supposed to be ganged potmeters. They are used for setting the level of distortion.
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Last edited by MarcelvdG; 5th November 2017 at 09:09 PM.
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Old 5th November 2017, 09:07 PM   #29
PMA is offline PMA  Europe
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Quote:
Originally Posted by Bigun View Post
But for some music, a SET amp does wonders. Go figure.
They do not in case you listen to complex classical orchestral music. They smear philharmonic music.
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Old 5th November 2017, 09:12 PM   #30
PMA is offline PMA  Europe
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Quote:
Originally Posted by MarcelvdG View Post

Taking advantage of the exponential characteristics of bipolar transistors and using loops of transistor BE-junctions,
It reminds me my diploma thesis almost 40 years ago, part of which was a multi-function converter with two LOG and two EXP amplifiers (BJT in opamp feedback). It was possible to wire it for pure quadratic transfer function.
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