Hw-104 Amplifier Datasheet [upd] Page

When searching, use keywords: "PAM8403 datasheet" instead of "HW-104 datasheet" for better results.

The HW-104 requires very few external components, as most are integrated onto the PCB. Below is a typical connection diagram for a portable stereo speaker. hw-104 amplifier datasheet

DC 2.5V to 5.5V (Ideal for 5V USB or single-cell Li-ion batteries). When searching, use keywords: "PAM8403 datasheet" instead of

The underlying IC (PAM8403) includes over-temperature protection (OTP) that activates around 150°C. If the amplifier cuts out unexpectedly, reduce the volume or improve airflow. | Symptom | Likely Cause | Solution |

| Symptom | Likely Cause | Solution | |---------|---------------|----------| | No sound, IC hot | Short on speaker output | Check that neither speaker wire touches ground or VCC | | Distorted sound at low volume | Input voltage too low (<2.5V) or audio source clipping | Use stable 5V supply; reduce source volume | | Popping noise on power-up | Lack of output RC snubber | Add 1µF capacitor in parallel with each speaker (optional) | | One channel silent | Broken PCB trace or bad IC | Swap L and R inputs to test; check solder joints | | Amplifier shuts down intermittently | Overheating or supply droop | Add heatsink or reduce volume; check power supply current rating (needs at least 1A for 2×3W) |

Below is the core technical data for the HW-104 module based on the PAM8403 specifications Specification Operating Voltage DC 2.5V – 5.5V (Recommended 5V) Output Power 3W + 3W (at 4Ω load, 5V input) Efficiency >90% (Class D) Speaker Impedance 4Ω – 8Ω Signal-to-Noise Ratio Dimensions Approx. 1.85 x 2.11 cm (Ultra-compact) Protection Thermal and short-circuit protection