Any schematics or anything for that? After seeing the other Sandman feedback arrangement posted on the first page I searched for more stuff by him, but found almost nothing.
I've found my first practical application of this: In my ongoing experimentation with motional feedback for woofers, I've not been able to apply particularly large amounts of feedback without running into stability problems. Using the error correction allows a significantly increased amount of feedback to be applied. Yay!
re: Unnamed feedback method explored
Dr. Evil,
In the Nelson Pass SuSy patent, US Patent 5,367,899, see figure 8 (prior art) is the basic Sandman circuit.
Tom
Dr. Evil,
In the Nelson Pass SuSy patent, US Patent 5,367,899, see figure 8 (prior art) is the basic Sandman circuit.
Tom
Ahhh, interesting. US patent 5,367,899: " System for perfume creation using aroma emission analysis from a living fruit and flower in close proximity"
Had me confused for a minute, but then I saw US patent 5,367,899 instead😀
Similar, but it's feedforward rather than feedback.
Had me confused for a minute, but then I saw US patent 5,367,899 instead😀
Similar, but it's feedforward rather than feedback.
re: Unnamed feedback method explored
D'oh!
My mistake. I always thought different amplifiers have unique fragrances.
yes! 5,376,899.
Tom
D'oh!
My mistake. I always thought different amplifiers have unique fragrances.
yes! 5,376,899.
Tom
Hi, MrEvil,
I just finished making your feedback idea. It does the job well, but I'm not sure wheter it is making a nice sounding amp.
From my observation, the sound becomes very clean, but the "room effect" disappears. Like classic guitar sounds like it has no resonance room in the wooden guitar cabinet. Too sterile, emotions disappears.
I think this is why amps with 0.00001 THD does not becomes a target for audiophile designers. Some harmonics is needed for "listen-to" audio amps (not measure-to)
I just finished making your feedback idea. It does the job well, but I'm not sure wheter it is making a nice sounding amp.
From my observation, the sound becomes very clean, but the "room effect" disappears. Like classic guitar sounds like it has no resonance room in the wooden guitar cabinet. Too sterile, emotions disappears.
I think this is why amps with 0.00001 THD does not becomes a target for audiophile designers. Some harmonics is needed for "listen-to" audio amps (not measure-to)
Indeed. Maybe if someone were to work out exactly what it is that was removed, then a circuit could be designed to deliberately add it back in, but to an adjustable degree. Then maybe any amp could be improved.
Mr Evil said:
Circuits that put extra harmonics into an amplifier already have been designed.
If the lack in sound is caused by your (maybe) harmonic differential amplifier it reads like a feedback feedback amplifier.
Using an offset opamp to feedback dc tosses out the dc part on the output.
Suppose your differential signal feeds back higher harmonics to the negative input of X1?
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