iHaospace VU Meter Backlight Recording Audio Level AMP with Driver Board

In AC/ DC 12-15V Power Supply for Transmission Plate. (recommended independent power transformer, or a separate winding power supply plate when not in use 45MA current backlight). L, GND, R: This is the driver board The low-level signal input terminals for connections are CD players, computer sound cards, the first stage, and other audio source signal device, L, GND wiring , RW respectively: To the left, the right channel can be. R1 and R2 are two adjustable resistors board driver can control the size of the swing hands. The backlight DC12V power meter is used after the driver board backlight used for voltage regulator. Note that the positive and negative head interfaces.