Problems regarding audio amplifier signal on output of TDA2030A chip

[Electricolin]

Dear users,

For my first electrical engineering schoolproject regaring an audio amplifier, I am experiencing the following problem:

When I connect a 1000Hz 0,6V signal from my signal generator, I receive a very thick sine wave on the output of the amplifier (See image). I used the the test circuit from the datasheet (See image) however I didn't include R4 and C7; because when I did include them in my circuit a few weeks ago, the resistor burned out. Does adding these two components fix my problem, if yes why? And when I should include them, why shouldn't this low resistance resistor burn out in the first place?

Please help, I cannot find the answer that I am searching for online.

Many thanks,

- Colin (First year electrical engineering student)

[wraper]

Without those components TDA2030 usually will oscillate at least in some conditions. https://www.eetimes.com/ic-audio-power-amplifiers-and-zobel-networks-one-size-does-not-fit-all/

[Vovk_Z]

Resistor burned because of powerful parasitic HF oscillation. Usually that circuit helps and it is needed to improve stsbility of an amplifier. If it doesn't work that may mean something done wrong in an amplifier design.

[rpiloverbd]

My humble suggestion is to recheck the circuit. Please check it part by part. Specially, check if any short circuit has occurred.

[CaptDon]

The circuit is unstable probably due to layout. You may want to put some sort of mild load resistor on the input like 10K. Since the circuit is an 'amplifier' it is prone to feedback if there is any sort of leakage from output to input including poor filtering on the power circuits and loads that cause unusual phase shifts. Sometimes output load impedance can also cause oscillations. The oscillations are typically 30Khz to 50Khz range.