Bảng Mạch Khuếch Đại Âm Thanh Kỹ Thuật Số Mini Xs9871 5v Mono 5w

Product introduction
-working voltage: dc2.5-5.5v
-working current: over 1a
-output power: 3-5w
-load range: impedance 2-8
Recommend matching 3w 4r horn



Interface definition
Vcc: dc2.5-5.5v (recommendation 5v)
G: power/audio (shared)
In: audio input+
Out: horn+
Out: horn-
(4-8) recommend 3w4r horn



Points to note
-please strictly installl the wiring line diagram
-power supply must not be turned back. reverse ic burns
-please use 2.5v-5.5v dc power source, non-ac power supply or above 5.5v power supply. dc 5v is recommended
-power current above 1a



Frequently asked questions
I. noise from amplifiers
-the power filter is not good because of ac pattern wave, which can increase the filter capacitance basically can solve the problem
-the sound source itself has a noise eliciting, and the test is recommended in a nondestructive format.
-poor quality of signal lines or not dedicated blind lines
-signal lines are broken down or suspended, and if the bottom line is on the input side, the noise is high
-the plate is shielded from interference by being mounted in metal casings
-interference with each other by sharing power sources.Unreasonable wiring when installling
Ii. small voice of amplifiers
-a speaker without a box exposed to the air will feel small if he receives a short-circuit sound wave. if there is no box for the time being, the simple test is: find a carton, stick it around the dry fluid to make a box, dig a big hole that just fits the horn, and play the horn outward
-the power and impedance of the horn are not matched with the performance. the rated power base of the horn should be greater than or equal to the output power impedance of the amplifier. the vibration film material and caliber of the horn are also important. please select
-input signal level is low to less than amplifier counter-demand, usually between 600 mv and 1v, and if not, add front amplifiers.
Iii. distortion of amplifiers
Distortion is the phenomenon of variation of amplitude ratio, phase relation and waveform shape between signal and output signal. audio amplifier distortion is two kinds: electric distortion and body distortion.Electric distortion is caused by electricity, and acoustic distortion is caused by the acoustic counter-phonograph: harmonic distortion, intermodulation distortion, transient distortion.Acoustic distortion is mainly ac interface distortion, by nature, nonlinear distortion and linear distortion.If the peak power of a amplifier output is 15w and the recommended working voltage is 12v, then the power supply power should exceed the peak power of the amplifier output by about 1.5 times about 22w, i.e., the current power/voltage of about 22/12 1.8a.Too high input level can also cause saturation distortion.Application: bluetooth speaker, truant speaker, trolley speaker, video machine,