This is a single function indicator designed with discrete elements.

Watch Video : http://youtu.be/zRfHpgFAAQA

The circuitry consists of a level indicator for low frequency signals.

The LED indicator is mono type. Dot bar type.

Input signal is standard - 0.750 V (Low level). VU meter not work speaker output (work only line level signal - 0.500 to 1V).

Input level control - trimmer-potentiometer.

12 LEDs.

Supply voltage DC - 9 to 15 V (max 120mA), (You can use the car battery).

Overall dimensions PCB 105x37mm (4.13"x1.45").