30 yuan DIY Bluetooth 4.4 balanced headphone amplifier supports APTX
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To save classic AKG headphones, I bought a Bluetooth version on Xianyu and DIYed a very compact headphone amplifier. The listening effect is quite good. This Bluetooth version is a disassembled headphone board from NetEase Cloud, supporting APTX and SCMS-T copyright protection protocol. It can connect to projectors like Epson. Previously, many Bluetooth versions I found did not support connecting to projectors. The keyword for this Bluetooth version on Xianyu is NetEase Cloud Music ME02B. It's recommended to buy two, as the solder joints are very small, and poor soldering can easily burn it out. I burned one and bought another. It's also recommended to use thinner wires for soldering. My first board burned out due to thick wires, making it difficult to position in the case. After soldering, it's recommended to apply some hot glue on the solder joints, first for fixation and second for insulation to prevent desoldering short circuits. The wiring connection is relatively simple; you can see the pictures I uploaded. The case uses a screw-less design with two snap posts. If it's not tight, you can add a little glue
The battery used is specification 701535, with a capacity of 350mha. I haven't tested the battery life yet, but dozens of hours should not be a problem
For the 4.4 balanced jack, buy the mini version
Cost breakdown:
Bluetooth board 4 yuan + 7 yuan shipping
Battery 11.9 yuan
Headphone jack 5.6 + 2 yuan shipping
Total material cost 30.5 yuan
Additionally, I made a headphone amplifier with a 3084 Bluetooth board, which has more functions and supported protocols. Welcome to check it out, https://makerworld.com.cn/models/1467173 Here are some pictures
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