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Old 22nd April 2013, 02:57 PM   #1
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Default Fixed "mistakes" on great sch :)

Somebody here posted sch for single supply stereo d class amp.I am new here and very long in this problematic so i saw instantly that he didnt post sch honestly but he cut 4 connections to make ti to not to work.However this is corrected sch.This Amp is really powerfull and high quality one.
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Old 23rd April 2013, 10:17 PM   #2
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I cant see a feedback path so it will hum nicely at low input levels.
It will also have quite a bit of distortion at higher output levels as the output modulates the power supply.
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Old 23rd April 2013, 11:15 PM   #3
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Class D doesn't have a feedback path, it is either on or off.
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Old 23rd April 2013, 11:41 PM   #4
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Quote:
Originally Posted by Harleyjon View Post
Class D doesn't have a feedback path, it is either on or off.
Quality class d amps have pre or post filter feedback.

Look up the class d irs2092 datasheet and you will see it uses pre filter feedback.
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Last edited by nigelwright7557; 23rd April 2013 at 11:44 PM.
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Old 23rd April 2013, 11:57 PM   #5
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Quote:
Originally Posted by Harleyjon View Post
Class D doesn't have a feedback path, it is either on or off.
kind of like human logic either smart or very stupid. "either on or off"
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Last edited by Reactance; 23rd April 2013 at 11:59 PM.
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Old 24th April 2013, 03:51 AM   #6
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Quote:
Originally Posted by Harleyjon View Post
Class D doesn't have a feedback path, it is either on or off.
TPA3116...internal feedback (inside the IC)

http://www.ti.com/lit/ds/symlink/tpa3116d2.pdf
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Old 25th April 2013, 10:34 AM   #7
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Guys , its nice to comment about D -class .... but AFTER u build and try something.I have behind me at least 10 differents concepts and all r working great......on each concept i made minimum 30 to 50 power amplifiers.So i will try explain a few things.The only hum and noise can exist on output on this schematic only if u put them on input.ON and OFF concept is right one and good starting point to think.....I can tell u that this is good design and very powerful,easy to make,try and play with.Point is that somebody posted this here and posted it with mistakes which r now corrected,so u r welcome .
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Old 25th April 2013, 03:17 PM   #8
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As your schematic shows no NFB path, any noise on the PSU lines will get straight to the speaker. If you added a proper frequency-compensated op-amp input stage with NFB taken from the switching side of your output inductor it'll make a reasonable amp.
I would be very wary of making foolish comments about "after you build something". There are quite a few of us here who are employed to design class-D amplifiers and know a great deal more about the subject than you will for a few years if you think the schematic you have posted is anything like the state of the art!
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Old 25th April 2013, 03:24 PM   #9
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Quote:
Originally Posted by Mikelandjelo View Post
Point is that somebody posted this here and posted it with mistakes
Where is that one? It would be good to show the correction in that thread too.
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Old 25th April 2013, 05:57 PM   #10
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Top page,red lines.Did u post that schematic?
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