2PCS 35mm VU Meter Stereo Audio Level Indicator Audio Meter Backlight Adjustable + Audio Level Amplifier Driver Board

Product Description: VU meter backlight voltage: AC6V-12V DC current; 500uA +-15% DC internal resistance: 650 ohm + -15% Calibration position: +5 Accuracy: Class 5 Working temperature: -22%-55 degrees Celsius Attention: Do not connect the output DC12V backlight voltage to the wrong VU meter when connecting the cable, because the current will burn out the meter head. Instructions for use: 1.AC 12V is the power supply. (It is recommended to use an independent power transformer, or an independent winding to power it). 2. L, G, R: These are the two-channel input terminals for the low-level signal of the driver board, which are used to connect the audio of the mobile phone, computer sound card, pre-stage, and other audio source equipment,and the wiring When L, GND, R. correspond to the left, ground and right channels respectively. Note: It cannot be connected to the output of the power amplifier, including the car CD player. 3. The adjustable resistance "5K-V" is used to adjust the brightness of the backlight. 4. Adjustable resistors "5OK-1 and 50K-2" respectively control the beating amplitude of the pointer of VU meter 1 and VU meter 2 Debug method: 1. Debug the level meter, find a signal generator, adjust the output frequency of 1KHz signal to 0.775v, connect the signal input of the driver board, and point the pointer of the meter to 0DB on the instrument panel. 2. To debug the VU meter, connect the driver board to the audio signal, adjust the adjustable resistance on the driver board, so that the loudness and rhythm of the ear to the sound are synchronized with the pointer, so that the pointer swing range is moderate. Package Included: 2*VU Meter 1*Driver Board 1*Connecting Wire.