Single power supply connection and dual power supply connection based on TDA1521 design

TDA1521 is a dual-channel audio power amplifier integrated circuit, 9-pin single in-line package, output power 2×15W. It has stable performance and good sound quality, and is more common in audio applications. TDA1521 can work in single power supply or dual power supply mode, and the working power supply voltage range is 15V~40V (±7.5-±20V). The following is the circuit diagram of TDA1521 single power supply connection and dual power supply connection:

Figure 1 TDA1521 single power supply connection

Figure 2 TDA1521 dual power supply connection

If conditions permit, it is recommended to use dual power supply mode, which can remove the output coupling capacitor (OCL circuit) connected to the speaker and improve the frequency response.