Hello guys

I'm trying to connect an op amp oscillator to an IC audio amp , the tda2822M in this case and I just can't get it to work .
I connect it as shown in the datasheets (audio test circuit) and all I get are these farting sounds like a deflating balloon everytime I connect the load . Or it just oscillates by itself and plays diffrently pitched tones .

I tried decoupling the input with a cap , still no luck .
What bothers me is that in the datasheet there is no diffrence between 'ground' and '-Vcc' , maybe thats where the problem lies .

Any help appreciated .

http://www.utc-ic.com/uploadfile/2011/0922/20110922094213287.pdf

I've got it connected in the 'stereo' arrangement but i'm only using 1 channel for now

 

I've also tried connecting a TDA2007 to the op amp oscillator and had similar results. Very distorted unstable output and sometimes works and sometimes not . Maybe i'm doing something wrong?

My input signal is about 300mv and i'm driving an 8ohm 0.1 watt load

 

You need to reduce the 300mV signal with a resistor divider as the TDA2822 has a voltage gain of 100 so you are over driving it.

 

You need to reduce the 300mV signal with a resistor divider as the TDA2822 has a voltage gain of 100 so you are over driving it.

Yeah I thought that might be the problem but it still doesn't explain the intermittent deflating behavior of the circuit

 

If found the problem .
It was indeed the very high signal input . Apparently the IC just stops working or behaves really wierdly if the input is too high .

Thanks k7elp60