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Descripción
Product introduction
1、Operating voltage: DC2.5-5.5V
2、Operating current: more than 1A
3、Output power: 3-5W
4, load range: impedance 2Ω-8Ω
Recommended to match 3W 4R speakers
Interface definition
VCC: DC2.5-5.5V (5V recommended)
G: power ground / audio ground (shared)
IN: Audio Input +
OUT: Speaker +
OUT: Speaker-
(4Ω-8Ω) 3W4R speakers recommended)
Precautions:
1, please strictly install the wiring diagram wiring
2, the power supply must not be connected to the reverse, reverse IC burned out
3, please use 2.5V-5.5V DC power supply, can not use AC power supply or higher than 5.5V power supply, DC 5V is recommended!
4, power supply current in 1A or more
Frequently Asked Questions
First, the amplifier board noise?
1, the power supply filtering is not good by the AC ripple caused by the increase in filter capacitance can basically solve the problem
2, the sound source itself has a noise lead, recommended the use of lossless format sound test
3, the signal line quality is poor or not with a special shielding line
4, the signal line lifting bad or empty, if the bottom line of the input side of the empty noise will be very large
5, the board mounted to the metal casing can play a shielding role, you can avoid interference to a large extent
6, shared power interferes with each other. Installation of the wiring is not reasonable
Second, the amplifier board sound small?
1, the speaker no box naked playback received sound wave short circuit will feel the sound is small, if there is no box, a simple test method is: find a cardboard box, stick up with not dry liquid around to make a box, digging a just can load the speaker's big hole, the speaker mouth towards the outside to play, the effect is better!
2、Speaker power, impedance and efficacy does not match, the speaker rated power seat should be greater than or equal to the amplifier output power impedance is generally selected 4-8 ohms, the speaker's vibration membrane material, caliber is also very important, please select the specific case.
3, the input signal level is low to less than the amplitude of the amplifier, usually between 600mv ~ 1v, if you can not reach the preamplifier should be increased.
Third, the amplifier board distortion?
Distortion is the signal and the output signal in the amplitude of the proportionality of the relationship between the phase relationship and the waveform form of the phenomenon of change, audio amplifier distortion for the electric distortion and body distortion two categories. Electrical distortion is caused by electricity, sound distortion is caused by the return of the sound of the electrical distortion caused by the real class: harmonic distortion, intermodulation distortion, transient distortion. Sound distortion is mainly AC interface distortion, according to the nature of points, there are non-linear distortion and linear distortion, beginners often ignore the following “electrical distortion” selection of the power supply voltage, power is too low, open the loud will be distorted. Such as an amplifier output peak power is 15w, the recommended operating voltage is 12V, then the power supply power should be greater than the amplifier output peak power 1.5 times about 22w, that is, the current=power / voltage=22 / 12=1.8A or so. Input level amplitude is too high will also cause saturation distortion. Product application: Bluetooth speaker, absentee speaker, trolley speaker, video machine and so on...
