Specifications:
Work: Class D (PWM modulation)
Channel Type: Single
Power range: DC 6-18V
Output Power: 20W (8Ω,18V), 13W (4Ω,12V)
Amplifier gain: 36DB
Input impedance: 1 KΩ
Output
Impedance: 4Ω~8Ω
Protection: Output short circuit, over power protection are (Troubleshooting restart recovery)
Quiescent Current: 8.5mA (12v Power)
Sleep Current: 0.1mA (12V Power)
Recommended Audio: 20-100W
SNR: 102dB
Harmonic distortion: Frequency range: 20Hz-20KHz
Working temperature:-40-80 ℃
Cooling: NO NEED
Dimensions: 18x18x2mm/ 0.7"x0.7"x0.07"

Output Power:
DC=8V (double lithium battery 6V-8.4V), R=4Ω, when@1 kHz, P=6Ω
DC=12V, R=8Ω, when@1 kHz, P=9W
DC=12V, R=4Ω, when@1 kHz, P=13W
DC=18V, R=8Ω, when@1 kHz, P=20W
DC=18V, R=4Ω, when@1 kHz, P=13W (4Ω speakers do not recommend the use of more than 13V power supply)

Amplifier board Note:
1, after the board powered amplifier, the hand can not touch the board components pin, because the human body with static electricity strong case directly breakdown components.
2, the power supply voltage should be stable, try switching power and battery power, if power supply ripple too serious, you can add capacitor filter.

Package included:
1x Micro Amplifier Module

• When amplifier powered on, the two speakers connected to the voltage between the pads is 0V, between the horn and GND pad , DC voltage of half the supply voltage
• Use 8 ohm speakers, the supply voltage can not exceed 19V, 4 speakers in Europe, the supply voltage can not exceed 13V, otherwise the chip easy to burn
• Try to use the speaker wire audio cable, 3 meters, if long cable connect speakers suggested that consideration plus diode (IN5819) to achieve the release of the self-inductance voltage protection chip
• 8 ohm speakers without adding substantially fins, less than 8 ohm speaker, if the chip temperature is higher than 60 degrees, due to stop work immediately, plus heat sink fan heat, otherwise the temperature will immediately burn the chip
• Speaker power must be greater than 20W, in order to properly test the amplifier, or affect the normal operation of the amplifier.

When amplifier powered on, the two speakers connected to the voltage between the pads is 0V, between the horn and GND pad , DC voltage of half the supply voltageQianson