Product selling point:
1. The VU meter is the most widely used volume meter at present. It uses the effective value of the average detector to determine the scale, and can only indicate the quasi-average value of the signal, and the human ear's perception of the loudness of the sound is closer to the VU meter. , so many people like to install a VU meter on the power amplifier
2. Responsive, wide-range voltage regulator circuit
3. Work performance is more stable
4. Using high-quality materials, the quality is guaranteed
5. The VU meter head is better, and the needle swings quicklyProduct parameters:
Product name: VU meter driver board
Model: VU02
Power supply: AC/DC12-15V ≥5W
Signal input: 0.775V ≤|
Backlight power output: 12V 50mA*2≤Instructions for use:
1. AC/DC12-15V power supply
2. L, G, R: These are the two-channel input terminals of the low-level signal of the driver board, which can be connected to the audio of the mobile phone, computer sound card, front-end and other audio source equipment (the signal is the signal that the earphone can hear). When wiring L, G, R correspond to the left, ground and right channels of the audio source device respectively. Note: It cannot be connected to the output of the power amplifier.
3. Adjustable power "5K-V" is to adjust the brightness of the backlight of the vu meter
4. Adjustable resistors "50k-1" and "50k-1" respectively control the beating amplitude of the pointer of VU meter 1 and VU meter 2Debug method:
Level meter, previously mainly used for tape recording, monitoring sound loudness, there are two standards 0DB=0.775 and 0DBV-1V, to prevent overloading and first distortion during recording
1. Debug the level meter. Find a signal generator. Adjust the output frequency of 1KHz signal to 0.775v, and connect the signal input of the driver board. The pointer of the meter head points to the instrument panel 0DB.
2. The debugging of the VU meter, the adjustment of the VU meter is much simpler, the driver board is connected to the audio signal, and the adjustable resistance on the driver board is adjusted, so that the loudness and rhythm of the ear to the sound are synchronized with the pointer, and the pointer swing range is moderate. At the maximum sound, the pointer points to the %100 position of the sign or the maximum value of the sign scale
