1. The speaker hole of this version is slightly defective. The speaker purchased is 20mm in size. The PCB speaker hole design is a little smaller and needs to be manually polished before it can be installed.
2. The tantalum capacitor package used in the speaker is a little smaller, and the pad can be enlarged a little if hand soldered.
3. Remove the tantalum capacitor near the micro USB port and use ordinary capacitors to save costs.
4. The sound quality is just that, it’s good as a decoration.
If you are interested, you can try it out if you learn from some music scores.
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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.
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