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Old 29th March 2013, 06:04 AM   #381
Baldin is offline Baldin  Denmark
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Quote:
Originally Posted by student_sound View Post
Hi friend !
can i ask you some things ?
i m new in class d, i built irs2092 amps 7d, with no input signal , but the output have some hi frequency noise like post #7
Sure IRS2092 Amp Issue, Please Help

Can i ask you what's wrong with it ?

Regards !
What you are probably experiencing is interfeerence from one chenel to the other (called beating), either EMI or through supply. If only on e chenel is connected, do you then hear whistling? If you use a SMPS the problem can also araise between amp and SMPS.
Problem araises from the switching noise generated by the switching components, and especially if you have say two chenels where the main switching freq in two chenels are different by less than 20 kHz.
Proper layout, shielding etc. helps a lot. but try lowering the switch freq of one chanel, or try insert some chokes on the different wires (keep these short ... they are like antennas).
Baldin
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Old 29th March 2013, 08:52 AM   #382
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Default hi Baldin !

hi Baldin !
Thanks for your replay ! i use classic xfmr power supply, and if i test channel one and channel two shutdown, the result is the same, i dont know why ?
please help me !

Regard !
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Old 29th March 2013, 04:22 PM   #383
vdij is offline vdij  Moldova
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Thank you, my friends. Sorry, I use Dicter-translator. SMPS - UC3825+ IRFР460. Student_sound, is generated at the output?
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Old 29th March 2013, 05:00 PM   #384
vdij is offline vdij  Moldova
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Hi studtnt_sound, you have the bridge. I do not see C1. In his bridge set frequency control.
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Old 30th March 2013, 02:16 AM   #385
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Default hi vdij !

hi friend !
i shutdown ch1 to test ch2. it's not bridge ,this is output mosfet before coil and spk output signal.
can you post that waveform of your amps ?

regards !
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Old 30th March 2013, 01:27 PM   #386
vdij is offline vdij  Moldova
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Hi, student_sound. What are your mosfet, which dt? I have a few amps: IRS2092+ IRFI4020, IRS2092+ IRFB5616, IRS2092+ IRFP4227. What interests you?
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Old 30th March 2013, 02:31 PM   #387
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Default hi vdij !

hi friend !
i use 2092+irf38n2D, i have irfp4227 too. Rgate 15ohms +5819.
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Old 30th March 2013, 03:24 PM   #388
vdij is offline vdij  Moldova
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All right. What dt - dead time? irf38n2D? - not found in Google
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Old 30th March 2013, 03:51 PM   #389
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I'd guess its IRF38N20.
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Old 30th March 2013, 07:42 PM   #390
vdij is offline vdij  Moldova
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No.
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