I am trying to make a simple audio amplifier using an LM386 audio amplifier and a class AB amplifier push-pull output stage. Since I couldn't find something that explicitly combines the two (LM386 for voltage amplification and transistor for supplying the required current), I thought I might give combining the two a shot. The LM386 application was taken from the chip datasheet, and the class AB design from here. The schematic is here. I couldn't put this on the schematic but pin 7 of the IC is connected to a 100 nF capacitor to ground, and between pins 1 and 8 there is a 10 uF capacitor in series with a 10 k potentiometer in order to set the gain from 20 to 200. The circuit will run from a single 9V battery.
My questions are
In the LM386 datasheet the electrolytic capacitor on the output has the plus towards the amp, but on the AB amplifier the electrolytic capacitor on the input has the plus towards the transistor, ie in the opposite polarity. Could someone help me understand how these capacitors should go and what should I do here?
I thought since the current might get high, I used resistors rated for 1 W. The question is regarding the 10k pot on the input, is 4W an ok rating? Or if the input signal is too high might it get burnt out? Also, between pins 1 and 8 of the op-amp I used a small vertical potentiometer in series for the capacitor, which is rated for really low power. Is this ok?
Could someone also please verify the overall circuit and tell me if it is Ok and whether it will work or not?
Later edit: Thank you for the answers. I understand that both the LM386 (with an internal push-pull output) and the amplifier together have too much gain so I will have to remove one of them in the final project. I have made the modifications suggested. I only have one question left, whether I should leave the 2 caps back to back from the LM386, or should I just use one with the + towards the LM386 output, and why? Also, are the modifications correct?