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Old 19th June 2015, 06:19 AM   #1
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Default Need help with iraudamp7d

i get only 120 watts in 8ohms and 100watts in 4ohms. all components and pcb is same as international rectifier.
what may be the issue?
thanks in advance
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Old 19th June 2015, 07:37 AM   #2
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How did you make the measurements and what power supply are you using?
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Old 19th June 2015, 09:19 AM   #3
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Originally Posted by abraxalito View Post
How did you make the measurements and what power supply are you using?
i m using transformer rating +-50volts 3amp. built just one channel. i measured output voltage and waveform. i measure it again changing feedback resistor and now i get around 180wats at 4ohms. cant go further dont know why.. and also dc protection trips when using speaker. but on resistor load it works well.
i am using 2n5401 for dcp instead of 2n3906 as in iraudamp7d ref. design
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Old 19th June 2015, 09:36 AM   #4
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"using transformer rating +-50volts 3amp" your answer is in front of you
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Old 19th June 2015, 11:34 AM   #5
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???
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Old 19th June 2015, 12:38 PM   #6
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what about dc protection tripping?
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Old 19th June 2015, 01:21 PM   #7
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You could trigger the DC protection from supply pumping I'd guess - your speaker's going to be inductive in the LF.
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Old 20th June 2015, 09:15 AM   #8
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Originally Posted by abraxalito View Post
You could trigger the DC protection from supply pumping I'd guess - your speaker's going to be inductive in the LF.
ok.
How much wattage will this board will require to provide output of 250watts in 4ohms?
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Old 20th June 2015, 09:26 AM   #9
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Do you mean 250watts average power on a sinewave ? If so that's 500W peak power (sine has 3dB crest factor) so your PSU's peak current delivery needs to be 11.2A. Its average will be considerably less.
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Old 20th June 2015, 12:49 PM   #10
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Originally Posted by abraxalito View Post
Do you mean 250watts average power on a sinewave ? If so that's 500W peak power (sine has 3dB crest factor) so your PSU's peak current delivery needs to be 11.2A. Its average will be considerably less.
yes sine wave.
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