2-in-1 mini power amplifier-V3.0

The V3.0 version has been updated. The hardware is error-free and there is no need to fly resistors and capacitors.

The headphone amplifier was changed to TPA6130A, with differential input and I2C volume adjustment.

It is still a four-layer board design, and the drawing is drawn using AD. Since the copper will be lost when importing EDA, the PCB is only for reference.

Another PCB source file has been uploaded. The microcontroller source program has been uploaded.

The interface has been changed to make the operation more convenient, the fonts are larger, and the settings will not be changed when the computer is turned off (without unplugging the power).

This is the first time I printed a panel at Litron, and the effect was pretty good.

For other details, please refer to the previous two editions.

Program-wise, amateur program.

The OLED driver has been mainly changed to make printing text more convenient.

The switch is a soft switch and the MCU is still running when turned off. Only turn off the power MOS, so that the power amplifier, headphone amplifier, and analog parts are powered off.

Simplified operation mode. See the video for details (Gu Gu Gu Gu first...).

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BUG 1:
There will be a problem when operating I2C when the power is turned off (tpa6130 power is turned off) because the amp chip and the screen's I2C are hung together.
Due to the above problems, the protection function only mutes the output and does not turn off the power MOS.

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For panel printing, I uploaded the CAD directly for reference. If you want to do it, it is best to redraw it yourself using the EDA professional version.

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Coordinate 021, blocked for half a month, SAN value dropped wildly. . . . . .

Just filled the previous hole.

I wish you all good physical and mental health.