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A2DP Bluetooth dongle audio receiver (SK-BTI-005)

Device teardown

Related: A2DP Bluetooth audio receiver Enjoy BT-AU01

A2DP Bluetooth dongle audio receiver (SK-BTI-005)

Small and cheap (about $17 with accessories) bulk Bluetooth audio receiver for headphones is available from several dealers on Ebay. I got my one from ETrony Tech. as Bluetooth headset A2DP stereo audio dongle receiver in a pack with US wall charger, cable and cheap headphones (with cheap sound). It is often referred as SK-BTI-005 with no manufacturer mentioned.

Listen the sound here. It work relativelly well, but it has two downsides:

It has no problem with the Bluetooth signal. Tested 5m through a wall.

Device teardown

teardown image

Opening the case was easy and no tools were needed. The PCB is even smaller than the case and a part of the case is empty. The device is based on BlueTunes® ROM QFN (which is based on CSR BlueCore®5-Multimedia ROM QFN) BC57F687A05 (technical overview, datasheet) with external 4kB EEPROM FM24C32A. It handles Bluetooth, pairing, sleep mode and LiPol battery charging. The third unidentified IC is probably a stereo amplifier.

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