Tda7388 consist of 4 channel class ab amplifier, these 4 channels are used to make different subwoofer amplifier arrangements. I have designed 2 different tda7388 subwoofer circuits. You can choose the best one.
Tda7388 subwoofer circuit
Normally tda7388 will produce 4 outputs, but this circuit has only 2 outputs because of the change made in the circuit design.
We add a low pass filter to the input section of tda7388, this will enable the amplifier to produce a low-frequency audio signal. This particular signal has an extra boom boom.
In this low pass section, I use a ne5532 op-amp and some passive components.
The main advantage of this circuit is it can works on a single power supply, so it’s more comfortable for a car audio system.
Tda7388 subwoofer circuit diagram
This circuit is much more similar to the datasheet circuit, but the circuit has an extra low pass filter circuit for filtering.
You can configure the output with your preference, in this circuit diagram I configured 4 outputs as a subwoofer.
Only the output and inputs sections are different from the first circuit, so you can rearrange the circuit diagram at your convenience.