TDA2614 Noise and Excessive Current

It sounds like the amplifier is oscillating. Make sure the +/- Vcc supplies are bypassed with 0.1 uF capacitors. I can't get to the datasheet without paying for it but that would be my guess.

Oscillation sounds likely to me, too.

FYI, here's the datasheet.

Yesit is oscillation. I have a 100nF and 120uF caps in parrallel together with an inductor between them (forming a Pi). I can see the oscillation in my input pin9 and before the coupling cap (220nF) the IC amplifies it and i can see it on pin6.

I do have a 22nF and8,2ohm resitor connected on my output as shown on the datasheet

Quick pointers, not familiar with the device, bypass caps as suggested i use 1nF 100nF parrelell combination -6dB att @ H freq also pay carefull attention to your PCB layout if designing one from scratch. Often the datasheet will give suggestions but watch out for high current track near signal tracks. Feedback? to much? can you adjust this? Bandwidth of the amplifier? STABLE PSU!!! Devise storage caps as close as possible to the silicon. EMI EMF interferance? Need sheilding? Hope you find a way to kill that oscillation.

I found this http://elexp.com/t_oscamp.htm

It looks like it's gonna work. i did simulate thi resistor + capacitor solution with a 1k and 100uF and oscillations disapeared. Current not high and 225kHz signal eliminated.

Now it's just a matter of adding this to my PCB...I hate modifications, makes your PCB untidy and you look like a careless Designer

Thanks guys

Nobody is perfect. You should see some aircraft electronics for hardware modifications. It's how you implement them safely that counts.....

The reason you have this "oscillation" comes from the power supply rejection characteristic of the operational amplifier. The one line 45db supply ripple rejection is nominally measured at 60Hz. Some manufactures still show the single pole rolloff curve for their instrumentation grade amplifiers. I would not be surprised if the 3dB point for supply ripple rejection would be 200Hz. But this effect exists for all amplifiers. Many but not all SPICE models include this in their embedded component characteristics. So simulating and varying the supply voltage may not reveal this effect. In strict terms this is not really an oscillation but an amplification of the supply noise at 225kHz.