Car FM BT adapter
Cheap (~$7-8 retail) car Bluetooth/MP3/FM adapter with USB charger. Opened because it was completely dead (no current consumed).
Microphone on top, USB socket for pendrive, two USB charger outputs, five direction joystick, very pointless bass boost button, two buttons on the side: on/off + channel.
Front panel is just held by friction.
White plastic cover is held by 2 screws out of 4 (cost savings?).
PDSA15E2F SoC
Bottom of the main board.
Second board - 12V to 5V converter - is inside the plug part. It is rather hard to remove as plug side contacts springs are strong,
I've finally managed to take it out using two screwdrivers like this:
HC2021A
I'm not sure if broken PCB trace at the bottom is my fault or not. It is near the contact spring, so it possible I've scraped it myself.
Inductor at the 12V input - cracked with burn traces. PCB was designed for two inductors in parallel - cost savings killed it?
Two new inductors + wire replacing broken trace.
7-segment LED display seems dim - semi-transparent plastic might be not the best choice. It shows periodally mode, FM frequency and supply voltage.
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