Driver board The fourth generation driver board instead of 7318IC drive plate improved the two disadvantages of 7318 driver 1 Small pointer swing 2 Small adjust sensitivity Instructions for use 1 Input AC DC 12V is the power supply for the drive board It is recommended to use a separate power transformer or independent winding for its power supply The current is 45MA when drive board does not use the backlight 2 L GND R This is the driver board low level signal input terminal used to connect CD machine computer sound card pre class and other audio equipment audio signal when wiring L GND R need respectively corresponding to the left ground and the right channel 3 The backlight DC12V is the power supply used for the backlight of the meter after the driver board is rectified and stabilized Note the backlight power supply current maximum support 400MA 2 When using the maximum current the supply transformer current can not less than 1A 12W 4 Header interface pay attention to positive and negative 5 R1 and R2 are two adjustable resistors on the drive plate that can control the size of the stylus swing VU Meter Color BlackMetarial PlasticSize 35 x 35 x 37mmMeasuring range 0 500UA10 Resistance 65010 Accuracy 5 Approved location Full scale 500UABacklight voltage AC DC 6 12VTo extend the life of the backlight bulb you can use the following methods 1 Under the condition that the backlight meets the requirement the working voltage