Description
xThere are two types of driver boards. The A version drives the watch head with LED, and the B version drives the watch head with tungsten wire. The wiring methods of the two watch heads are the same, but there are 3 resistors that are different. Before shooting, you must first understand whether your watch head light source is LED or tungsten wire.
Professional grade VU meter, level meter, power meter driver board, dynamic compression 4-fold protection function
1. Adopt an imported integrated circuit chip specially designed for audio level testing, including a square root dynamic exponential compression circuit (for example: input 1V, output 1V; input 4V, output 2V; input 9V, output 3V), taking into account dynamic and precision indication, the pointer swing is moderate, avoiding the drawbacks of small signal pointer not moving and large signal pointer bottoming.
2. No independent power supply is required, and it can be directly extracted from the original power supply. Compared with the TA7318P/TA7332P, the cost of a transformer is reduced, and the installation is more convenient and flexible because it takes up half of the internal space of the chassis.
3. The circuit design is perfect, with the following characteristics:
The input is equipped with a low-pass filter circuit to filter out high-frequency interference, suitable for harsh power supply environments (such as car audio systems).
◆ The output sensitivity is adjustable, suitable for a variety of specifications.
◆ The most commonly used 12VDC power supply, easy to use in car machines and PCs.
◆ With power polarity reverse connection protection function.
◆ With power-on pointer protection function, avoid priming the power-on pointer and prolong the service life of the watch head.
◆ Adopt 0.5W metal film resistor, large power margin, to ensure long-term continuous, reliable and stable operation.
The driver chip is: BA6318
[Technical parameters]
[Input sensitivity]: Input 400Hz audio signal, measure with AC mV file of Fluke 8025B digital multimeter, input terminal: 97mV, 39 level meter pointer is + 3dB position.
[Power supply voltage]: 12V 0.12A.
[Driver VU meter, level meter sensitivity]: Recommended 500UA sensitivity, 630 ohms internal resistance. At this time, the damping effect is quite good, and the damping effect of other specifications of the level meter will be different, and further adjustments need to be made.
Description: The power supply voltage must be strictly guaranteed to be 12V. Although it can work for a short time beyond 12V, it will burn the protection circuit for a long time. The wiring must be powered off, and the man-made failure caused by live operation is not covered by the warranty. The finished board is guaranteed for 3 months.
2024 latest watch head driver board
Power supply voltage: AC 12V
Size: 53 * 63mm
Stereo input and output, can drive two VU level meters, support LED and tungsten lamp backlit meter head
Description: The power supply voltage must be strictly guaranteed to be 12V. Although it can work for a short time beyond 12V, it will burn the protection circuit for a long time. The wiring must be powered off. The man-made failure caused by live operation is not covered by the warranty. The finished board is guaranteed for 3 months.
Tungsten lamp head backlight pins do not need to distinguish between positive and negative
Additional Information
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