Here is the circuit of a Class B audio amplifier based on TDA1553. TDA1553 is a monolithic audio amplifier class B, containing 2 x 22 watt amplifier in bridge configuration load attached. The amplifier operates from 12V DC and develops intentionaly for car audio applications. The IC also has a lot of good features such as short circuit protection, protection of the load dump, reverse polarity protection, speaker protection, etc.
In the circuit, C5 and C4 are decoupling capacitors C3 input, while setting the delay for speaker protection. C1 and C2 are filter capacitors of the offer.
Notes :
- Assemble the circuit on a good quality PCB.
- Use 12V DC for powering the circuit.
- The circuit can deliver 22W per channel into 4 ohm speakers.
- Fit the IC with a proper heat sink.
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