5pcs/lot OEP30WX2 dual channel audio digital power amplifier board high module D class 12V LCD TV 10W15W | Обустройство дома

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OEP30WX2 dual channel audio digital power amplifier board high power module D class 12V LCD TV 10W15W

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Amplifier gain use 36dB benefits: because some audio device sound source signal is too weak, using 36dB amplifier to enlarge the sound will be very large, using the market 20dB amplifier to amplify the sound will be very small. For example, the output of the mobile phone is weaker than that of the computer audio signal, and amplifying the voice with 36dB power amplifier is very large. If the computer audio signal, using 36dD amplifier to enlarge the sound too big, sound and untrue distortion, we should lower the volume of the computer. If the computer is not convenient to adjust, the 26dB welding disk on the power amplifier board can be short connected up, so that the volume is much smaller, or the volume of the power amplifier board is input on the power amplifier board. Resistance is 1K, using a series of 200-1000 European resistance voltage to change the volume of power amplifier, so that the amplifier will not appear amplification saturation distortion), so that the amplification sound is not distorted, not difficult to hear. Power amplifier gain use 36dB bad: if the audio device has a weak noise signal when it is silent (no sound), it will make a big noise through the 36dB power amplifier, so some customers say why the power amplifier does not have a loud noise (because the noise comes from the input source, breaking the amplifier board into the audio line. " There is no noise in the loudspeaker. The 26dB gain pad is short and the noise is improved. The noise of desktop computers is much larger than that of laptop computers. It is generally recommended that customers test using notebook computers to provide sound source. Attentions of the power amplifier board: 1, after the power supply board is supplied, the DC voltage between the 2 pads of the horn is 0V, and the DC voltage between the horn pad and the GND is half of the power supply voltage. 2, select 4 Euro horn, the power supply voltage can not exceed 16V, otherwise the chip is too high to damage the amplifier easily. Select 8 euro horn, the highest voltage can not exceed 24V, otherwise the voltage is too high to break the power amplifier chip. 3. After the power amplifier board is electrified, the hand can not touch the pin on the board, because the interference signal interferes the timing of the digital amplifier, causing the damage chip, the human body with static electricity - the strong high voltage will appear breakdown damage chip, the harm of the static electricity of the human body is necessary to know. 4, the power supply voltage should be stable, try to use switch power supply and battery power supply. The power supply should not exceed the working voltage of the board, otherwise the chip will be burned, and the digital power amplifier will be more delicate than the analog power amplifier. 5, the horn connection is controlled within 3 meters with the sound line as far as possible. The inductance of the line is too long and the voltage of the self inductance voltage high breakdown power amplifier is produced. The long line horn recommends IN5819 to realize the release protection chip of the self inductance voltage. 6, 8 ohm horn basically do not need to add heat sink, less than 8 ohm horn, if the chip temperature is higher than 60 degrees, because of the immediate stop work, add heat sink fan heat, otherwise the temperature will burn off the chip immediately. 7, the horn power must be greater than 30W, so that the power amplifier can be tested normally, otherwise the normal operation of the amplifier will be affected. Our test uses 4 euro 300W stage speakers, and the speaker sensitivity is 95dB. The rated power of the horn must be greater than the output power of the amplifier. Otherwise, because the horn power is too small, the voice coil heating interturn short circuit causes the amplifier can not work normally and damage the power amplifier. Reminder: The power amplifier board acquiescence the 36DB gain, the computer input can only open 20% volume, otherwise the amplifier will be seriously distorted because of the serious distortion, and the amplifier chip is badly damaged and damaged the horn at the same time. Mobile phone input can be 90% volume, because the audio signal of mobile phone is much weaker than that of computer. If the computer wants to open 90% of the volume, it must reduce the gain of the power amplifier board and the two 26DB gain pad on the short board. Once the input audio signal is too strong, the amplifier gain must be reduced, otherwise the amplifier has magnified distortion and serious distortion magnification - more than the output power of the amplifier, the chip will be damaged. Common sense problem of electronic power supply: 24V voltage is not a direct supply of power amplifier board, because 24V directly supplies the power amplifier board, the voltage is too high, the capacitance is short short, the current will be super large, and then the power amplifier 36DB gain, the sudden change of the current strong capacitor will be very large, the power amplifier chip exceeds the output power of its own. Break through short circuit damage. The 24V voltage can only start the 220V voltage through the switching power supply to buffer the 24V voltage, thus controlling the problem of instantaneous high current. (24V battery or lithium battery powered, can only be connected in series with 1-2 VCC 5W resistor current limit, thereby reducing the problem of excessive instantaneous current. R & D personnel experience for many years: do not recommend the use of the default 36DB gain, amplification power is too strong, weak noise signal is easy to be magnified. Once the input signal is too strong, the amplifier will distort easily and seriously distort the amplification, which will damage the chip beyond the output power of the chip itself.