VU meter driver board  
       
with dynamic compression, backlight power supply  AC and DC input, 7810 regulator
        

 Features:

1,Use high quality integrated circuit chip, including the square root dynamic index compression circuit (Example: input 1V, output 1V; input 4V, output 2V; input 9V, output 3V), taking into account the dynamic and accuracy Instructions, pointer swing moderate, to avoid the small signal pointer does not move, the big signal pointer rendering the drawbacks. 

 

2, No need independent power supply, can be derived directly from the original power supply, compared with the TA7318P / TA7332P, reduce the cost of a transformer, and because the occupied space inside the chassis reduced by half, the installation is more convenient and flexible. 

 

3, the circuit design is perfect, has the following characteristics:

 

 ◆ input low-pass filter circuit, filter out high-frequency interference, suitable for harsh power supply environment (such as car audio system). 

 ◆ Output sensitivity adjustable for a variety of VU meter.

 ◆ the most commonly used 12VDC or AC power supply, AC and DC

 ◆ Power polarity reverse polarity protection function, using 7810  regulator, the noise is lower.

 ◆ There are power pointer protection function, to avoid the boot pointer to extend the life of the meter.

 ◆ 0.5W metal film resistors, power margin, to ensure a long time continuous reliable and stable work.

 

Technical Parameters

 

 [Input sensitivity]: input 1000Hz audio signal, with the Fluke 8025B digital multimeter AC V file measurement, the input: 7.46V (corresponding to the output power is about equal to 7W8 ohm), 39 Vu meter is +5 dB.

 [Supply voltage]: AC or DC 12V 0.12A.

 [PCB size]: 4.5cm × 5.3cm.

  [Backlight supply terminal]: DC9V 120MA available. For small light bulb backlight power supply.