Audio amplifier car board
Yes, that would work. You need a good heatsink for the amplifier chip and you need heatsink paste to get good heat transfer between the chip and the heatsink.



Figure 1. TDA7388 chip. Note that eight wires need to be switched. None of the speakers is connected to GND (battery '-').

The big problem with this is that you have to switch eight wires from the radio to the speakers. This will give you many hours work lying upside-down in your car with your head under the dashboard.



Figure 2. FM transmitter.

If your FM radio is good then a much simpler solution is to use a mini 3.5mm FM transmitter.


Plug transmitter into music player.
Find a position on the FM band where there is no local station.
Tune the transmitter to that station.


Your pretty car radio antenna will pick up the signal and you have no other work to do!







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 3. Bluetooth and FM.

If you really want no wires from your music player then you could go Bluetooth -> FM as shown in Figure 3. It should work but maybe the audio quality will get a little bit worse.