Bluetooth Audio Modifier has built-in Bluetooth antenna structure is simple, the power supply voltage is 3.7V~5V version selection, active speakers increase Bluetooth connection function. Audio Power Amplifier Board has 7PIN output interface is spacing 2.54 through-hole, 7PIN output interface is: + power, ground, left a channel, right channel, mute, LED status indicator, reserved port. The LED state port is connected with a 100-ohm resistor in series, LED indicates the ground connection, the Bluetooth is not connected and the flash is fast. After the Bluetooth connection is successful, it is slow flashing.
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