I have a old autoradio (cassette and not AUX input ) in my car. But i don't want change because it pretty. I just want to add bluetooth. I leave fm receiver side for the true audio / radio.

I want to know if i purchase both parts :

• TDA7388 four-channel 41W audio amplifier board and
• Bluetooth home-car receiver adaptor

SEE TDA7388 DATASHEET: http://www.kynix.com/uploadfiles/pdf9675/TDA7388.pdf
I connect the audio amplifier with bluetooh receiver and power amplifier with speaker and i add a switch, to switch(speakers) between true audioradio/power amplifier.

I know i must add a power convert 12V->5V for the Bluetooth module.

I want to know if this is good "cheap" solution ?