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Old 27th August 2015, 02:18 PM   #41
bogdan_borko is offline bogdan_borko  Serbia
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Actually, it was a prose literature quote. I had to resort to that kind of answer - i know that you know what caps in feedback loop do, and even if you didn't, it's written in post #1 (third paragraph from the bottom, last sentence).
Aham, sorry, didn`t see the line, it looked to me like voltage divider... Have you listened to compare to some other kinds of compensation, there could be audible differences, or you just made it not to ring on square waves?
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Old 27th August 2015, 04:58 PM   #42
juma is offline juma  Serbia
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I would not use the word "compensation" - there is nothing to compensate for, the amp is stable without those caps. I put them in routinely, as a precaution, to limit the bandwidth (usually a flat freq. response up to about 100kHz provides a flat phase response to at least 20kHz which is what I aim for).
So, with or without those caps, no change in sound here.

Those amps which will turn into oscillators without some compensation scheme tend to show change in sound with different compensation types. So yes, in many cases careful approach and extensive testing in this area (or any other) pays dividends.
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Old 27th August 2015, 07:01 PM   #43
4real is offline 4real  Netherlands
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Nice little setup this. Did some simulation, and distortion figures are quite good: at 1V input, only 0.0009% with only 250mA Iq.

Would it be easy to use other laterals? How does one adopt the schematic for them?
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Old 27th August 2015, 08:04 PM   #44
juma is offline juma  Serbia
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Laterals ate not many and they are all very similar so it will be just a simple matter of adjusting the bias and offset.
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Old 27th August 2015, 08:18 PM   #45
4real is offline 4real  Netherlands
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Laterals ate not many and they are all very similar so it will be just a simple matter of adjusting the bias and offset.
Well, I was thinking about ALF08NP16V5. Tried some simulations, but could not get distortion below 1%. It could very be the models though.. just as well as my lack of enough knowledge
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Old 28th August 2015, 03:17 PM   #46
bogdan_borko is offline bogdan_borko  Serbia
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Quote:
Originally Posted by juma View Post
I would not use the word "compensation" - there is nothing to compensate for, the amp is stable without those caps. I put them in routinely, as a precaution, to limit the bandwidth (usually a flat freq. response up to about 100kHz provides a flat phase response to at least 20kHz which is what I aim for).
So, with or without those caps, no change in sound here.

Those amps which will turn into oscillators without some compensation scheme tend to show change in sound with different compensation types. So yes, in many cases careful approach and extensive testing in this area (or any other) pays dividends.
Ok, so any reason, why not to limit bandwidth with the input filter instead? Tried that? I`m just "comparing notes", to see does your experience matches mine (I use similar circuit in my amp).
Cheers, Borko.
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Old 28th August 2015, 05:07 PM   #47
juma is offline juma  Serbia
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Input filter is OK too. Furthermore I think it would be more effective in environments with a lot of RF pollution. If the need arises I'd probably put both, carefully adjusted to cover every possibility, but right now i don't feel like it...

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...(I use similar circuit in my amp)...
What amp is that ?
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Old 29th August 2015, 01:35 PM   #48
bogdan_borko is offline bogdan_borko  Serbia
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but right now i don't feel like it...


What amp is that ?
That amp it`s not on the forum pages, still don`t have a chassis...
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Old 29th August 2015, 02:36 PM   #49
juma is offline juma  Serbia
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Aaah, I know - famous "the invisible one".
Very popular design - there's a lot of them on the forum ...
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Old 29th August 2015, 04:09 PM   #50
bogdan_borko is offline bogdan_borko  Serbia
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No, one can see it, I can send pictures if you`re interested, but not the circuit.
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