ALL power amplifiers have an input volume control. Yours does not.
The input volume control allows an amplifier to normally have too much voltage gain so that low level inputs can be "turned up".
High level inputs can be "turned down". Add an input volume control and turn it down so the amplifier does not saturate.
If you use an audio-taper (logarithmic) volume control set to half then it attenuates the input about 10 times. So a 3V peak input becomes 300mV at the input of the amplifier. The amplifier has a voltage gain of 33 so the output peak is not clipped.
The datasheet warns about reducing the gain by reducing the value of the 22k resistor. If the gain is less than 24dB (a gain of 16 times) then the amplifier will probably oscillate at a very high frequency.
Hello audioguru, thank you for the reply.
About the volume control, this circuit I showed is the power amplifier itself. It will have a preamplifier before the input, which will have the volume control. Let me show you how I thought it should be.
**broken link removed**
The input signal will enter in C3. Voltage control is R7. LF353 helps us making a low pass filter for the subwoofer (B, on the right). There will be 3 TDA2030 amplifiers, 2 for left, right and 1 for the subwoofer. A amplifier should go after the LF353(B). Also, for stereo, there should be 2 copies of this circuit, one for left, another for right (both without the low pass filter, of course), and one power amplifier in each part. I'm googling how could I put the low pass filter in order to sum or something, the signals from both left and right (or what is the best way to put the low pass filter).
But, let's go by parts. The volume control you told is needed is in the preamplifier. Is that correct?
So, if I understood correct, the saturation is normal, and will happen when you amplify too much high level inputs, so you have the flexibility of the variety of input levels. Is that correct?
If you have any other good suggestion of this circuit (specially how to add the low pass filter), I would be grateful.
Thank you