Product desceiption:
Level meter, VU meter, a small table-driven power amplifier boards, circuit design
reference Japan's Panasonic and DENON finished machine table head drive circuit, a
professional audio amplifier chip.

Three characteristics:
1, designed for audio level testing and design of an integrated circuit chip imports,
includes the square root of a dynamic index compression circuit (Example: Input 1V, the 1V;
input 4V, the 2V; input 9V, the 3V), taking into account the dynamic and precision
instruction pointer swing moderate, avoiding the small signal pointer does not move, the
large signal pointer backing of the state.

2, no independent power supply, power supply leads directly from the original, as compared
with TA7318P / TA7332P, reduce the cost of a transformer, while inside the chassis takes up
less space because the half, the installation is more convenient and flexible.

3, the circuit designed, has the following characteristics:
Enter the installation of a 1ow—pass filter circuit to filter out high frequency
interference, power supply for harsh environments (such as car audio system).
Output sensitivity adjustable, for a variety of specifications header.
The most common 12VDC power supply, easy to use in-vehicle device and PC computers.
Has a power reverse polarity protection.
Have energized pointer protection against boot pointer base, extend header life.
Use 0.5W metal film resistors, large power margin to ensure reliable and stable work
long hours.

Technical Parameters:

[Input Sensitivity]: 400Hz input audio signal with Fluke 8025B digital multimeter range
measuring AC mV, the input: 97mV, 39 level meter to + 3dB position.
[Power supply voltage]: DC12V 0.12A.
[PCB Size]: 5.2cm X 6.3cm.
[Backlight power supply terminals]: Available DCl0 to 12V 50MA. Power for small bulbs
backlighting.
[Drive VU meter, level meter Sensitivity]: Recommended 500UA sensitivity, 630 European
resistance. At this point the best damping effect, the level meter damping effect other
specifications will be different, the need for further adjustments.

Description: The supply voltage must be strict to ensure 12VDC, l2VDC, although more than
a short - term work, but a long time will burn protection circuit. Power connection Wiring
must be carried live operation of this man—made damage is not covered by the warranty
failure.

Instruct ions for use:
1, the input section:
Lin, 0, Rin, is an audio signal input terminal for CD audio output connected to the left
and to the right channel. Or an output terminal connected to the first input terminal
selection stage, the former should not connected to the output stage output or volume
potentiometer.

2, the output section:
Two VU Meter side ”+” and "—" terminal as an output, respectively, should be connected to
Two level meter the ”+' and '-” terminal.

Drivable level meter sensitivity recommendation: DC 100 microamps to 500 microamps. Should
not exceed 1mA.
Board 2 500 European blue 3296 series potentiometer can adjust the sensitivity of the two
separately header. Clockwise, sensitivity can be improved.

LA, LB for the backlight power supply terminals, RA, RB of the other set backlight power
supply terminal.

Package Included:
1 x VU Meter Driver Board DB Audio Level Meter