As a newcomer in electronics as a hobby field, before starting, my humble request to everyone is to not get annoyed by my questions which sometimes may be little silly.
So lets get started: I have started studying a little about opamps for audio amplifying and the IC I am using is a TDA2030. In previous circuits, I used to have a potentiometer to control the gain of the opamp, and that method worked very well,
Then I realized that I can't use a potentiometer everywhere to control gain of this IC so I found another formal way to do this; the diagram is shown below:
When I start this circuit up, I get very high noise for a few seconds from starting time, every time. The noise goes away automatically after a while; it takes almost 1-2 mins to get pure sound without any noise. So what I want is: as soon as I start the circuit, the noise is removed.
Am I missing some other components which is making it behave so? If yes so what are those and please explain their functionality. And what is the cause of this startup-time noise?
When I discharged the Capacitor C1 before running the amplifier, this produces same noise for few seconds again. Why so? Does the capacitor's charged or discharged state matter here? Or is it the original functional procedure of the IC?
Thanks for your precious time, and please always put a schematic with example for my better understanding which will be more preferable to me.