Precautions for use: 1. The recommended power supply voltage is 8-24V DC. If it exceeds 26V, the chip burn; 2. When connecting a 42-ohm speaker, the power supply should not exceed 16V, and when connecting an 8-ohm speaker, the power supply should not exceed 24Vo 3. The recommended power supply current is 2A or more;4. The positive and negative poles of the power supply cannot be connected in reverse, otherwise the chip burn; this module is only suitable for single power supply and cannot be connected to a negative power supply. 5. that the input audio signal is between 0.5V and 1.5V;6. The speaker cable should not be too long, ensuring that it is within 1 meter 7. Pay attention to electrostatic protection. Before touching the amplifier board, you need to release the static electricity on your hands to avoid static electricity from breaking down the amplifier chip. Digital amplifiers are sensitive to static electricity;8. It is recommended to use a speaker with a rated power of 30W or above to avoid the speaker from heating and burning. Colour:blue Material:PCB Troubleshooting 1. After power-on, the speaker makes a "" sound and then does not respond 1) Check whether the speaker impedance is too small and the power supply voltage is too high. The instantaneous high current causes the chip to enter DC protection; try to reduce the power supply voltage and restart. 2) Check whether the power supply is too small to drive the speaker. Try to replace a high-power power supply. Generally, a 2A power adapter be fine. 2. There is a "sizzling" noise when playing music 1) Replace the to see if it is the noise of the itself. 2) Ground the input end of the amplifier to see if it is a problem with the amplifier itself 3) Use a shielded audio cable to see if the noise is introduced by the quality of the cable 4) Replace the speaker to see if it is a problem with the speaker itself 5) Replace the power supply to see if it is the noise introduced by the unstable power supply 3. The speaker heats up and smokes during playback The speaker power is too small. Replace a high-power speaker or reduce the signal input Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * DY-AP3001 Power Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.