50pcs lot Power Amplifier Board Class D 2x3w Ultra-Mini Digital Stereo Audio Amplifier Board Module PAM8403

Product 1. Operating voltage: 2.5V-5.5V. Note: The power supply voltage should not exceed 5.5V, the power supply should not be reversed. 2. Speaker with: 4-8 Ω, recommended: 4 Ω; Speaker power: 2-8W. 3. Can use the computer USB port 5V power supply, or use the phone charger 5V 5V power supply, you can also use the lithium battery power. 4. High efficiency 90%, 4Ω load and 5V power supply conditions, can provide 3W (left channel) +3 W (right channel) output power. Class A, B and other power amplifier efficiency is only about 30%, D class amplifier in today's green trend under the highly respected. 5.D class amplifier power is extremely high, not because of the temperature impact of sound quality, and do not add heat sink, take a small volume. Application: LCD TV, monitor laptop Portable speakers Portable DVD player, game console Phone / handsfree phone Precautions for use: First connected to the speaker and then connected to the power, or easy to cause damage to the chip; Since the digital volume control in the module has a large gain, do not let the audio signal input too large to make the signal cut.