1. Output: Single channel Digital Audio Output
2. Input:- USB/SD Card Slot/Bluetooth/FM/AUX.
3. DIY speakers and modified audio/car rare weapon
4. Support MP3/WMA/WAV/ format music.
5. Power Source: USB & Battery.
6. Battery supply voltage: 5v.

• The sound quality is very good using this module.
• Mono digital audio amplifier chip.
• High output and low power consumption.
• Applicable speaker impedance: 4-8 ohms (8 ohms is the best).
• Product specification:
• Operating voltage: DC8-24V
• Output power: 60W

• Current: 5A
• Supply voltage: DC 8 – 26V (DC power supply)
• Package included: 1 x HF183 Digital Bluetooth Amplifier Board 1 x Remote Control

Audio Amplifier: Nex Electronic

• Built-in 2 channels (dual) enabling use in stereo and bridge amplifier applications. Dual : 6W×2 (typ.)
• Bridge : 19W (typ.)
• Minimun number of external parts required

• On-board LM386 Chip.
• 20 times gain circuit design.
• On-board speaker wiring Block.
• On-board 10 K variable resistor, you can adjust the volume of the amplifier.
• On-board power indicator.
• The chip pin was leaded, can be directly input audio signal.
• Operating voltage: 5 ~ 12 V.

• Supply Voltage: 3.7~5.5V
• Support U Disk: 32GB
• Support TF Card: 16GB

Pin Description of PAM8403 Amplifier Board 

• Operating Voltage: Wide power supply ranges from 3V to ~5V or less DC
• Dual-channel stereo with high output power (3W 3W Output at 10% THD with a 4Ω Load @5v DC or Less)
• Max Gain 24 dB.
• Filterless architecture
• Low Quiescent Current and Low EMI
• Operating Temperature: -40 to 85°C
• Short Circuit Protection
• Thermal Shutdown
• Superior Low Noise
• Efficiency up to 90%
• Dimensions (LxWxH) in cm 2.1 x 1.8 x .3
• Weight: 2gm.