Hey everyone,
I’ve been experimenting with small audio circuits lately and came across the Miniature Digital Amplifier Board PAM8403, a tiny dual-channel Class D amplifier that claims 3W × 2 output at 5V. It looks like a great fit for Bluetooth speakers, Arduino sound projects, and wearable audio modules, but I’d love to hear from others who’ve actually used it.
How well does it perform when powered by a 3.7V Li-ion battery? Does it maintain good clarity and stereo separation at low voltage, or start to distort near max output? Also, has anyone faced noise or interference issues when connecting it to microcontrollers (like ESP32 or Raspberry Pi Pico) without extra filtering?
Would appreciate your insights, especially if you’ve used it in DIY speakers, smartwatch sound modules, or portable audio systems.
Hi!
I used it to replace chinese amplifier ic in portable radio it use 4V Pb accumulator, sound is good and loud in all range of voltage I think from 2V-5V. Only problem the speaker out is not common GND.
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Hi.
I used this amplifier module to build an analog (RDA5807 chip) and an ESP32 internet radio. In both cases it works great, the quality is good. I also tried it with an isolation transformer on the input.
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