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
what may be the issue?
thanks in advance
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
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?
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.
i tested my board and found that one side was not getting ground connection thats why my board was continuosly triggerring dc protection now board works all fine. I got 225watts at the point near clipping. i was using +-50volts transformer. looking at efficiency factor, is this output correct?
Your transformer is 300VA (50V +50V =100V multiply bythe cuttent 3A), that is 300VA or watts. A transformer driving a resistive load would nominally output 300W.As the IRS amps are about 90% efficient the most you could expect is 270 Watts. However this will be lower into a loudspeaker.
The reality is that you trasformer is too small to allow more output.
The reality is that you trasformer is too small to allow more output.
the output i mentioned was tested on a resistor load. i did not talk about loudspeaker load. for determining clipping i made the measurements using a scope.
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