Amplifier gain using 36dB benefits:Because some audio equipment, audio signal is too weak, with 36dB amplifier amplification will be great, with the market 20dB amplifier amplification will be very small. Such as mobile phone output audio signal than the computer audio signal weak, with 36dB amplifier to enlarge the sound is great. If you take the computer audio signal, with 36dD amplifier to enlarge the sound is too loud, the sound and distortion ugly, should be to reduce the computer's volume, if the computer is not easy to adjust, you can put the amplifier board 20dB pad shorted up, so the volume is much smaller , Or in the power amplifier board input series resistance to reduce the volume (power amplifier input resistance is 1K, the use of series 200-1000 ohm resistor divider to change the amplifier volume, so that the amplifier will not appear amplification saturation distortion), so that amplification sound is not distorted, The

Amplifier gain using 36dB damage:If the audio device in the mute (no playback) when there is a weak noise signal, through the 36dB amplifier will put the noise is very large, so some customers say why the amplifier is not playing a lot of noise (because the noise from the input signal source , The amplifier board input audio cable is broken in the speaker which is no noise) to the amplifier20dBThe gain pad is shorted and the noise is improved. The noise of the desktop computer is much lighter than the laptop. It is generally recommended that customers test the use of laptops to provide sound sources.

Amplifier gain specification (required):Computer audio signal is very strong, universal amplifier amplifier gain is 20DB, each amplifier must be set to the minimum gain buyer. For weak audio signal input, use only 36DB gain, the benefits of saving the cost of the preamplifier circuit.Amplifier gain, also known as input sensitivity. Set the gain to match the host's signal output, its function is when the host's output volume is the largest, also makes the power amplifier output to the maximum. Do not use the gain as a volume adjuster. If the gain is set incorrectly, when the setting is too large, the amplifier is often clipped, or into the protection state. If the setting is too small, often make the amplifier to play the best power. The key to setting the gain is to ensure that the maximum of the host is not true voltage or volume, and the senior technician can judge by listening.

Power amplifier board Note:1, power amplifier board power supply, then the horn between the two pads DC voltage 0V, between the speaker pad and GND DC voltage is half of the power supply voltage.2, power amplifier board power, the hand can not touch the board components on the pin, because the human interference signal interference digital amplifier timing, resulting in damage to the chip, the body with static electricity - strong high voltage will break the damaged chip, the human body electrostatic hazards Be sure to know.3, the speaker power must be greater than 60W or more in order to normal test amplifier, or affect the normal work of the amplifier. We tested with a 4 Euro 300W stage speakers, speaker sensitivity 95dB. The rated power of the loudspeaker must be greater than the output power of the amplifier. Otherwise the speaker power is too small, the voice coil heating interchain short circuit caused by the amplifier can not work and damage the amplifier.

Tips:Power amplifier board default 36DB gain, computer input can only open the maximum volume of 20%, otherwise it will be serious because of amplification distortion, power amplifier chip serious damage, while damage to the speaker. Mobile phone input can be opened 90% of the volume, because the phone audio signal is much weaker than the computer. The computer to open 90% of the volume, you must reduce the gain board gain, short board two 20DB gain pad. Once the input audio signal is too strong, you must reduce the amplifier amplifier gain, otherwise the amplifier appears to amplify the distortion, serious distortion amplification - beyond the output power of the amplifier will damage the chip.

24V voltage is not directly available to the power amplifier board, because the 24V direct supply amplifier board, the voltage is too high, the capacitor is short-circuit instant, the current will be super-large, plus power amplifier 36DB gain, capacitor instantaneous strong current mutation , Will be 36DB power amplifier is very large, the amplifier chip than its own output power and breakdown short circuit damage. 24V voltage can only be through the switching power supply, start 220V voltage to buffer the start 24V voltage, thus restraining the moment of high current problem. (24V battery or lithium battery power supply, only in the VCC pin series 1-2 ohm 5W resistor current limit, thereby reducing the instantaneous current is too large problem.

R & D personnel years of experience: not recommended with the default 36DB gain, amplification is too strong, weak noise is easy to be amplified. Once the input signal is too strong, the amplifier is easy to distort, serious distortion amplification - beyond the chip's own output power will damage the chip