If you want to build a simple Bluetooth amplifier board. AudioB plus Bluetooth audio receiver is a good choice for your project. This is a bluetooth 4.0 stereo recevier, Apt-X supported. Based on CSRA64215. We breakout pins to 2x10 2mm space male pins. You can integrate it to your project easily. This module has a U.FL connector. You can connect an external 2.4G antenna with it by using a U.FL to SMA cable.
Single-ended signal output
Single-ended signal output with headphone/small speakers
Differential signal output
Note:
Features: