Help needed with irs2092 amp

robivitez · 17th December 2011, 03:42 PM

I'm building amp based on iraudamp7d reference design. I made new PCB layout, but almost same as iraudamp7d. Today I soldered it to the stage, to just test the irs2092. No output mosfets, no OCP. Only thing I managed to do is kill the irs2092. On the both output is -40V. Could someone check the PCB?
What should I check? I have a osciloscope to.
Does anyone have a tested simple as possible PCB that I could try?

nigelwright7557 · 18th December 2011, 11:58 PM

All you can do is go back and check your schematic for errors.

Personally I wouldnt have powered it up without the mosfets.
The amp requires feedback to oscillate.

luka · 19th December 2011, 06:13 AM

why didn't you use fets? you can solder everything on, and just don't connect main voltage... you can provide +/-5 for the IRS and about 12v for IRS gate drive

And if that all is good, you can use main voltage... you can even ramp it up slowly from +/-0v to +/- what even you have for your supply, it you can get your hands on adjustable supply, not some trafo or smps

I would never not use fets when powering up IRS

18th December 2011, 11:58 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	All you can do is go back and check your schematic for errors. Personally I wouldnt have powered it up without the mosfets. The amp requires feedback to oscillate. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

19th December 2011, 06:13 AM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	why didn't you use fets? you can solder everything on, and just don't connect main voltage... you can provide +/-5 for the IRS and about 12v for IRS gate drive And if that all is good, you can use main voltage... you can even ramp it up slowly from +/-0v to +/- what even you have for your supply, it you can get your hands on adjustable supply, not some trafo or smps I would never not use fets when powering up IRS __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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