Electric Rain said:
...Um... not to be rude Nigel, but isn't it obvious? I simply want to double or tripple the wattage of the amp that I posted the schematic of. But I want to do it by cascading the IC that was used in the schematic.
No it's not obvious :lol:
Simply because it doesn't work like that! - so your question was totally meaningless.
An audio power amplifier can do no more than output a voltage limited by it's power rails, by bridging two amplifiers you can effectively double this voltage - but the same constraints apply!.
So assuming you have a 12V supply rail the absolute MAXIMUM voltage that can be delivered is 12V peak to peak (actually less, due to losses in the amplifier - but I'll assume 12V for ease!).
12V p-p is 4.24V RMS, you calculate the power by squaring that (giving roughly 16) then dividing by the speaker impedance. In this case 16/4 gives 4W into 4 ohms, or 16/8 gives 2W into 8 ohms.
Cascading two amplifiers means putting them in series, this is a stupid thing to do with two power amplifiers (you would use an opamp for the first one instead), and would only increase the voltage gain of the system - no increase in power whatsoever!.
If you wanted to increase the power you need to do one of two things, increase the supply rail, or lower the speaker impedance. Either of these will probably require updated amplifier components.
What sort of power are you looking for?, into what impedance?, and from what supply voltage?.