Wholesale Price VU Level Audio Meter Driver Board + 2pcs with Warm Color Sound Pressure 9V-20V AC Input | Инструменты

Wholesale Price VU Level Audio Meter Driver Board + 2pcs with Warm Color Sound Pressure 9V-20V AC Input | Инструменты

Wholesale Price VU Level Audio Meter Driver Board + 2pcs VU Meter with Warm Color Sound Pressure Meter 9V-20V AC Input

"Product selling point:

1. Using a professional audio VU driver IC, not the TA7318 we used before, this IC contains a square root dynamic compression circuit, logarithmic output characteristics, to avoid the small signal pointer not moving, when the large signal, the pointer is bottomed The phenomenon.

2. The IC has the function of mute. At the moment of power-on, the mute function pin will get a low level, which can avoid the phenomenon that the pointer is bottomed at the moment of power-on. In order to conform to the habit of booting, the pointer will swing with a small swing.

3. The circuit uses 6-12VDC power supply, and the original IC BA6138 is used, which will be very convenient to use.

4. The use of double-sided circuit boards is actually to ensure the firmness of the crimping terminals, so that the pads of the terminals may not be loosened after multiple wiring.

5. Each drive board has been tested and adjusted by our professional test stand to ensure the consistency of quality. The design and layout of the drive board is beautiful and reasonable, and there is no interference and self-excitation. Each board is tested and adjusted by our professional test stand. There are no special requirements. We input 1W/8 ohms (2.83V), and use the P-55 meter for load testing. The pointer swing is Scale of 0DB. If you have special requirements, you can send a text message to explain. The adjustment of the swing, in addition to adjusting the load potentiometer, can also be considered from the input voltage divider circuit.

The brightness of the backlight can be achieved by adjusting the resistance of R9 and R10. With the electrical parameters of the backlight, it can be easily calculated according to Ohm's law. If you want help, please text us.

6. Crimping terminal

The crimping terminal we choose has a moderate height. The most important thing is that the crimping method is very reasonable, which can firmly compress the wires of various sizes. In addition, we use a double-sided board, and the pads of the crimping terminals are relatively firm and not easy to loosen.

7. Circuit board size

The installation size of the circuit board, the outer frame is 67.4MM*56MM, and the installation size of the screw hole: 57MM*50.5MM. The screws are suitable for M3 screws.

introduce:

1. This is a new upgraded version of the dedicated VU meter, with a warm yellow backlight, the backlight voltage is 6-12V, and both AC and DC can be used. Suitable for 5W-60W tube amplifiers and amplifiers, direct power amplifier output (parallel to the speaker), easy installation, simple adjustment, high sensitivity, with overshoot protection, praised by the majority of DIY netizens. Suitable for 5W-60W power amplifiers and AV amplifiers, mainstream tube amplifiers 6P6 300B KT88 can be used with confidence, and 3W radios are also supported.

2. The terminal is improved, and the welding of the terminal is more convenient after the improvement. Simple wiring, easy installation, adjustable pointer beat range, with overshoot protection. The driver board is the latest upgraded version, both AC and DC are available, and the quality is stable and reliable.

Tips:

1. Before use, check whether the pointer is aligned with the zero point. If there is any deviation, use a screwdriver to adjust the pointer to the zero position.

2. The design voltage of the backlight is 6-12V. If the backlight brightness meets the requirements, reducing the working voltage of the backlight can greatly extend the life of the backlight bulb. It is recommended to use 9V.

Precautions:

1. The VU meter and the driver board need 9-12VDC for normal power supply, and the AC and DC power supply cannot exceed 12V. Although it can work for a short time when it exceeds 12VDC, the protection circuit will be burned for a long time. You can use 9v AC power supply. If the background light of the meter is too dark, the 2W470R resistor on the original version is too large, you can replace it with the attached small resistor 2W30R and everything goes smoothly, and the effect is quite good. If the input signal is too strong, a resistor of about 10K should be connected in series at the input end. If the signal is too strong, the pointer of the meter should be bottomed, and a 10K resistor should be connected in series with the input end. If there is no improvement, two 50W 15K resistors can be connected in series at the signal input end of the power amplifier. Aluminium shell resistors (this is suitable for transistor amplifiers). The luminous effect is brighter and more uniform, which is beneficial to prolong the service life. The recommended working voltage can be about 10V.

List:

Driver board X1

VU Meter X2

"