Mini Bluetooth Amplifier M01-Desktop Listening Series

The original reason for the creation of this project is that
the desktop power supply is too complicated, and there are more than a dozen devices connected to the 12V integrated power supply. The audio signal is extracted from HDMI. When plugging in an external powered speaker, it makes a squeaky sound.
A faint useful sound can barely be heard among the noise, which is impossible to hear.
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This one is integrated Chicken to the end.
 
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Input voltage: 12-24V-DCIN/TYPEC Built-in 12V decoy
                  12V input can basically run at full power. The higher the voltage, the greater the power headroom.
Output power: PAM8407DR - 2x2.4W Class D
 
audio source connection: Bluetooth audio source connection is turned on by default, and the button switches to 3.5mm-LIN input.
 
Appearance size: PCB=43*45mm, complete machine=length 47.4 (including baffle)*width 45*height 18.5mm
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built-in Bluetooth (a certain treasure wallet and mail integration) is said to be 5.0.
This project uses Jerry AC22BP, which seems to have cut off the USB. The previous AC20BP had USB, but the circuit was different.
That's it, just listen to the sound, 5W can be used to dance in the square at full speed.
For general desktop use, it only consumes 0.3W, which is very power-saving. It's too noisy when it's too high.
 
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2023/3/6 version v2.0 adds elimination switching, shutdown popping circuit, adds Bluetooth normally open jumper, compatible with 2 types Decoy chip.
 
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EPC-13S -------1:1 isolation transformer