900W H-class PA Amp with Limiter

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#3,124
rohin said:
if you are getting 0v dc on output then its ok. few other resistance are also heating.i don't know about r27 but in other post apex tell us that some resistance must be hot.
Click to expand...

Thanks rohin... i found my mistake.. i forgot the most important one.. that is to put jumper on the output 🙁 .. now one channel is ok.. im working with other channel. I got R21 R23 burn resistor.. then when checking other parts .. Q5 and Q4 and MJE15033 damage also.. im going to test again after ill replace the parts..

i just observed that when power is on. MJE15033 and MJE15032 immediately temp rise. Hope u can give suggestion..


Thanks & regards
 
#3,125
H900 successful trials supply 120 60 ct.
 

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#3,128
boss2009 said:
Thanks rohin... i found my mistake.. i forgot the most important one.. that is to put jumper on the output 🙁 .. now one channel is ok.. im working with other channel. I got R21 R23 burn resistor.. then when checking other parts .. Q5 and Q4 and MJE15033 damage also.. im going to test again after ill replace the parts..

i just observed that when power is on. MJE15033 and MJE15032 immediately temp rise. Hope u can give suggestion..


Thanks & regards
Click to expand...
yes mje are hot but not so much.testing without heat sink is always risky.this is common problem for diy because we did all with our hand even pcb.pcb may short or open.wrong component fitting or forget something.in this case no one can help you.if your one channel is working that give some confidence to you to solve it.be brave and clear fault.best of luck.
 
#3,129
rohin said:
yes mje are hot but not so much.testing without heat sink is always risky.this is common problem for diy because we did all with our hand even pcb.pcb may short or open.wrong component fitting or forget something.in this case no one can help you.if your one channel is working that give some confidence to you to solve it.be brave and clear fault.best of luck.
Click to expand...

Thanks rohin.. i tested last night the second board.. its now ok.. next test with signal at input will be done when i have already heat sinks..

Rohin.. do you have pcb for APEX B600 TEF.. if u have.. please send to my email add ( (y2kact@yahoo.com) tia

Thanks & regards
 
#3,130
rohin said:
i think you didn't get my point.negative side mean npn transistor and positive mean pnp side.fault is not in your bias fault is in mosfet circuit and ic circuit.heat sink and fan not a matter when so much heat come.because h class amp known as low heat amp if you get heat then its ab class amp.you are first guy who has face this probelm.its realy painful after hard work.
Click to expand...
Will u give me right pcb becouse now I have doubt on my pcb
 
#3,133
my first project in 2015, vertax h 2500 with three stepper.my friend will make pcb for me.i request to apex sir please confirm that schematic of vertax is 100 % ok.if you give us little idea about pcb size and transistor placement then it will be great gift for diy of new year.
 
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