biscuitownz

Hi everyone, This is a fix for the amp powering on for a some time and then turning off by itself. This is a better method compared to what was mentioned earlier about "jumpering" the 5V input to the amp turn on control pin as this bypasses the auto turn-on circuit and might even make the power switch unless. This method allows you to retain the auto turn-on feature and the use of the power switch. Connect a ~4.7k resistor to pin 1 of Q7 (located next to the 5V connector) and ground. This PNP transistor provides 5V power to the auto turn-on circuit and without it the amp will not turn on. The problem is the base of Q7 no longer gets pulled down and 5V is no longer supplied to the circuit, which turns off the enable signal for the power supply. I'm not sure why this happens and it has been difficult to trace back without a schematic. Also, don't waste your money on buying "audio grade" capacitors for this repair. All of the capacitors on here are either for decoupling, reserve, or timing. None of them are in the path for audio as this is a class D amp. Just get the cheapest capacitor from a reputable brand and you'll be fine. I have a lot of experience with the IRS2092 and have designed a few amps using this driver. If there are any questions regarding the output stage I will be happy to assist.