Circuit like TDA2050 amplifier circuit diagram has only one TDA2050 IC and with a preamplifier circuit based on TL072 Op Amp chip. If you have already built the above circuit (TDA2050 amplifier circuit Diagram), the TDA2050 bridge amplifier is just an improvement design for more output power. We obtain more audio power through this circuit by bridging the two TDA2050 Chips, SIMPLE!
Normally, TDA2050 can output 50W maximum audio power into a 4Ω speaker. It can power 8Ω speaker with 25W to 32W maximum power. So, in this design we can expect anywhere up to 60W. TDA2050 has a maximum operating voltage of 50V which means, you can use ±25V dual rail supply to power the Chip.
