Features:Driver Board:The design of bridge rectifier filter circuit can be a transformer or DC power supply, the supply voltage is 12-15V/300mA. The level fluctuations are adjustable and can be compatible with different table head types. The drive signal source can be connected to the amplifier input or audio amplifier output without changing the original circuit. Supports backlight power supply with two level indicators, changes the current limiting resistor and can be connected to different backlights. The driver board supports two output terminals. VU Meter: Voltage 500MV, Weight: 21 grams, excellent quality, cute appearance, stable and reliable performance. Header DC Resistance: 652Ω The backlight of incandescent lamps. Operating voltage: 6~12V AC or DC In order to meet the brightness of the backlight to the requirements under the conditions, a lower operating voltage can significantly extend the service life. A current limiting resistor in series from 100Ω to 200Ω must be used to reduce the impact on the filament cuff. Technical data: Material: plastic + metal. Driver board: 6.8cm x 5.5cm VU meter: 3.4 cm x 3.4 cm