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Old 5th May 2014, 05:58 PM   #3821
stewin is offline stewin  Kenya
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thanks all for the replies I will post project picts and results of the discreet amp.
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Old 6th May 2014, 03:31 AM   #3822
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This one has nice parameters IRFB4115.

Good for 1 ohm load with +-56VDC rails.
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Old 7th May 2014, 07:23 AM   #3823
manojtm is offline manojtm  India
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Hi All,

I am using FDP075N15A MOSFET

good for EMI
good for 1R load @ +/-68V Supply rail (Tested for 1 Hr.)
good for 2.6R load @ +/-73V Supply rail (Tested OK 10 Hr.)
good for Bridge 2.6R load @ +/-65V Supply rail (Not tested)

Tested with 1Hz freq. 4R load @ +/-55V Supply rail without heat sink 1 Hr.


Regards
MANOJ

Last edited by manojtm; 7th May 2014 at 07:27 AM.
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Old 7th May 2014, 04:26 PM   #3824
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IXTQ82N28T hows this mosfet for dclass only 3$ each
warm regards
andrew
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Old 17th May 2014, 10:22 PM   #3825
stewin is offline stewin  Kenya
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words by original designer of this lovely thread topic.

Quote:
Originally Posted by ejtagle View Post
Well... i was thinking if it would be worthwhile to try to answer or not to all the things that have been told about this amp. I was the designer of it, and, be sure, i know the limitations of the design. Severe compromises had to be done in order to make this design doable by common people.
Please, take into consideration that the design was severely affected by the semiconductors that are/were readily available on the local market, here in Argentina. Of course you can always buy fancy and more appropiate components from an international supplier, such as Digikey or Farnell, but that would make nearly impossible to hobbists to build it, just because it is extremely expensive and difficult to import electronic components in low quantities, at least, here.
The design lacks several features desirable for a commercial design, specially , all the required protections (short circuit, overvoltage, etc). It is also using old (but cheap and easiliy available) mosfets that are not "suitable" for class D audio. It even uses an IR211x mosfet driver, that "lacks" internal deadtime control, and requires a level shift translator (a discrete one).
And, i also agree that the board should be a double layer one with metallized holes, but, again, such board would put the design out of the possibilities of regular hobbists, because metallized holes on boards can't be done at home... And would require boards to be professionally made, rising costs again.
And , of couse, the inductor should be wound on a ferrite/metal powder core, but, again, it would mean amateur hobbists are left out of the design...
So...
Take this amp as a proof of concept, and NOT as a commercial design... It has room for lots of improvements (use more suitable mosfets, for example... add external deadtime control, redesign board as a double sided one, etc... But please, do not complain... I see none of you posting designs, all i see are people trying to get already designed and foolproof schematics that outperform, if possible, commercial designs with special components, and lots of time used to debug those designs...

Eduardo

PD: regarding the deadtime, the IR211x has non simmetric propagation delays (turn on is delayed more than turn off, so... it can be taken as internal delay... And the circuit features a basic R and diode in series with mosfet gates, to control it... So it is not fair to say no deadtime control was provided... AND i know the internal diode of this mosfet is slow... BUT, that's exactly one of the purposes of the R||D in gate network... To make the switching time a little bit slower, so we don't blow the internal diode in the process... Of course this rises the disspation of each mosfet, but allows to use slower and cheaper devices... So , lot of compromiese are here... You are free to change mosfets, if you need, so don't complain!)
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Old 13th June 2014, 12:36 AM   #3826
stewin is offline stewin  Kenya
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hi all my latest work and respect to the original thread so far i have tested it and is working. i will post more results and details and more clearer photos
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Old 13th June 2014, 03:08 PM   #3827
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hai enybedy help me?
iwant make a good classD amplefire but idon't have good circute
give me sombedy a circute plzzzzzzz
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Old 14th June 2014, 11:39 PM   #3828
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Quote:
Originally Posted by stewin View Post
hi all my latest work and respect to the original thread so far i have tested it and is working. i will post more results and details and more clearer photos
Hi mr Stewin
Is your pcb 2 layer or one?
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Old 15th June 2014, 12:05 AM   #3829
stewin is offline stewin  Kenya
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no the ucd using ir ic is single sided :-)
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Old 15th June 2014, 08:01 AM   #3830
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Quote:
Originally Posted by stewin View Post
no the ucd using ir ic is single sided :-)
wich one is beter?
your ucd amp or mr manoj aud600?
thanks
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