How hack a FM receiver to a bluetooth speaker.
I have a penguin FM receiver. But His sensibility is not very good.
I found on ebay a USB Bluetooth audio key. Mhmm It's sound good for a easy hack :)
I remove all connector, USB, and Jack.
Add some wire: power supply (red and blak), on USB pad. Audio, on jack pad (gray-GND, orange-RIGHT, white-LEFT), and the LED (orange and blue)
Now I open my FM penguin, and I remove all active components except the audio amplifier (TDA2822M)http://www.st.com/web/en/resource/technical/document/datasheet/CD00000134.pdf
The GND bluetooth module is soldered closest to ground power supply of the penguin circuit, to limit interfering noise.
It's a party