Sell ∈●AIYIMA TDA7377 2x35W Power Amplifier Board Stereo 2.0 Amp Sound Amplifiers NE5532 Preamplifier DIY best price

Specification Using the new TDA7377 power amplifier chip, with the NE5532 pre-amplifier, make the power output of the TDA7377 power amplifier chip more powerful. Maximum output power: 35W+35W Working voltage: DC9-16V Size: 50*33mm Note: Heat sink is not install on this amplifier board . So heat sink must be equipped before test. R8 and R10 are the magnification setting resistors (the default delivery is about 2 times magnification, and the magnification can be changed as needed. The resistance can be selected from 10k-68k. The larger the resistance, the higher the magnification. If you use plug-in resistors, The original chip resistor can be removed, and the plug-in resistor can be soldered on the pads at both ends of the chip position) Package included: 1 PC Amplifier board Product Questions 1. Amplifier board has current sound and noise during use Most of our amplifier board use DC power supply. The board itself does not produce current sound and noise. The main causes of current acoustic noise are: A, The power supply filter used is not good; the current sound is caused by wrong input by the power or audio input. B, The input signal quality is poor; the output of the device connected to the input is improper, and the noise is caused by the abnormal input of the audio source. C, The input cable is of poor quality; the line is in poor connect; the wiring is damaged; the wiring is suspended D, The input connection has other playback devices, and some devices share the power supply to cause noise. 2. No sound output, no sound in 1 channel? A, The speaker is broken, or the speaker cable is not connect well. B, The input cable is not in good connect; the wiring is damaged; the output of the device connected to the input is improper. 3. Volume broken and breaking sound when turn loud? A, The power input is insufficient, confirm the wiring is correct first, and the supply current is sufficient, B, The speaker itself has poor performance or damage, and the speaker power is too small or too large. C, left and right channel speakers (+) (-) output are independent, can not be connected to each other 4. Speaker broken sound when subwoofer amplifier volume turn loud ? A, The power input is insufficient, first confirm the wiring is correct, the supply current is enough B, Whether the power of the speaker itself is too large or too small, or the bass performance of the speaker itself is poor; the structure of the speaker box; these abnormalities will cause breaks. 5.The volume power is not enough? Power and power supply voltage, the amplitude of the sound source signal, the size of the speaker impedance are all related, any kind of deficiency will affect the power 6. Will the amplifier be burnt? A, The positive and negative poles of the power supply are connected reversely; the power supply voltage is too high, exceeding the limit operating voltage of the board B. If the board req