Hello, i bought a few irs2092s “500w” amps
When powered with +60v, 0v “virtual ground” and -60V, the amp powers on and runs fine with no output load (fan spins) but when the amp board is connected to any speaker (tried many) the speaker extends fully and the power supply registers high current draw, wires heat up etc.
Tested my 50A dual power supply which is perfectly fine and works with my other amps.
Have gotten 3 of the board all from different suppliers, all have same issue.
Heres one i got off amazon
If anyone has any ideas lmk
If anyone knows of a schematic for these boards would also be really helpful, im hoping to find a fix as i have 3 of them doing this
When powered with +60v, 0v “virtual ground” and -60V, the amp powers on and runs fine with no output load (fan spins) but when the amp board is connected to any speaker (tried many) the speaker extends fully and the power supply registers high current draw, wires heat up etc.
Tested my 50A dual power supply which is perfectly fine and works with my other amps.
Have gotten 3 of the board all from different suppliers, all have same issue.
Heres one i got off amazon
If anyone has any ideas lmk
If anyone knows of a schematic for these boards would also be really helpful, im hoping to find a fix as i have 3 of them doing this
Does the IRS2092 driver chip oscillate?
Does the speaker output oscillate?
Does it have 0volts between the speaker terminals?
Does it use discrete output FETs or an output chip?
Does the speaker output oscillate?
Does it have 0volts between the speaker terminals?
Does it use discrete output FETs or an output chip?
From the schematic it seems that this board takes two rails (+60, -60V), and additional +12V. Perhaps that's the problem...
Measured output terminals with no load or input and its putting out a dc voltage of 60v…? which is odd
The 2092 can be a strange beast.
Some wont oscillate without a load connected.
Also dont run amp with no load as output filter will ring with very high volts.
Some wont oscillate without a load connected.
Also dont run amp with no load as output filter will ring with very high volts.
I don't know what you call a "virtual ground". These amps need a solid "positive -Ground- -negative" supply from maybe 2x 50-70Volt.
Arranging single power supplies to half baked dual PS has risks. If 3 amps don't work I would try a "real" power supply and stop these experiments. The heart of the amps, the 2092s IC, is not very tollerant and now may be toast on all the amps, after these "virtual ground" treatment. If so, they won't work any more, even with a correct installation. The power should rise on both voltages when switching the amp on. There are some safety features build into the IC you may trigger. You should order one more to try it out...
As far as I know you have a good chance for a working amp with the LJM D-amp modules. They seem to be some of the less worse constructions from China.
Many of the 2092 amps seem to emit quite high HF levels when used without a metall enclosure.
I should have added for testing use a 220r on output to add some load.
Saves blowing up speakers.
This amp has a uneven current draw at idle more on the negative side...this will drift a virtual ground PS to that side putting double voltage on the positive side. Also it wont current balance the PS while in operation. Look at a QSC 1400 schematic to see how its really done. Something I am currently working on...