lm1875 power amplifier board

**# LM1875 #** A 2.1-channel power amplifier board composed of LM1875. The left and right channels are forward amplification circuits, and the subwoofer is BTL output. It adopts a one-point grounding method and needs to be used with a power filter board due to space reasons.      

Absolutely HIFI(*￣︶￣)!

The PCB board making effect is as follows!

        Pursue HIFI quality and create excellent projects! After using lm1875 and other devices, you can enjoy the ultimate HIFI experience. Multiple holes are reserved for the coupling capacitor to meet different needs. The accessed sound source is controlled through Omron relays to achieve smooth sound switching, and the singing voice is clear and natural. It's not like the kind of squeezed-out sound, it's very clear and makes people feel like they're actually there! If you want to DIY a small desktop amplifier of your own, this will be your best choice!

        Coupled with a speaker protection plate made by myself, it is safe and HIFI!

　　If you like it, please give me a like! May you have a good time!

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Supplement from n years later. . . . . Because I'm too lazy. . . So it took this long to really perfect this little gadget. . . .

Picture first

That's it. . . . There are no changes. . . La la la(～￣▽￣)～

Regarding the voltage of the power amplifier board, the +-15V part seems to be more suitable. It can be smaller. The +-25V part can also be changed, as long as it is a voltage suitable for the lm1875. I did exactly this and every part worked normally!

Have a nice day everyone!

Attached is my own power board circuit and tuning board. . . There's nothing great about it, especially the power strip, which I feel like I designed a little too gaudy.

The demonstration video after the production is completed is as follows (I don’t know if it can be recorded with heavy bass):