This is a simple TDA2050 amplifier circuit diagram with a preamplifier stage using the Op Amp TL072 chip. TDA2050 chip is a five (5) pins HI-FI audio amplifier chip common in most audio amplifier circuits especially the class AB circuits. Because of its high voltage (up to 50V) tolerance, it is more reliable over the other five (5) pins TDAs series like TDA2003, TDA2050, etcetera-etcetera.
The TDA2050 chip can output up to 50W audio power in a 4Ω impedance speaker. It can probably output 25W in an 8Ω speaker. With this, it is obvious that TDA2050 surpasses the other five pins TDAs audio amplifier chips.
Meanwhile in this design, the TDA2050 amplifier circuit diagram uses ±14V but to ensure the maximum output power, you can (on your own) use ±25 and a regulated ±14V for the Op Amp chip. Note that the input power is also a factor for best output power of the circuit.
Also, ensure adequate heat sink system for the chip (TDA2050). However, the IC is designed with thermal and short circuit protection system. You can find more about this chip on its datasheet on your own.