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Topic: Problem to using LM386 amplifier (Read 186 times) previous topic - next topic

FarizBram

Hello everyone, i'm sorry if my English is bad. I have some project to play audio sound into the speaker using Arduino. I use Arduino nano, dfplayer mini (for playing sound) module, LM386 amplifier module, and 4 Ohm 3 Watt speaker. when I just connecting Arduino -> DFplayer -> speaker, the output sound is ok (clear sound) but I need more louder, so I used the LM386 amplifier module. but when I connecting Arduino -> DFplayer -> LM386 -> speaker, the output sound is so ugly, I mean so much noise (I think).

I use configuration like this :
Arduino Nano pin:
D10 (RX) -> 1K resistor -> TX dfplayer
D11 (TX) -> 1K resistor -> RX dfplayer

DFPlayer pin:
VCC -> 5v arduino
RX-> 1K resistor -> TX Arduino nano
TX -> 1K resistor -> RX Arduino nano
SPK_1 -> in + LM386
GND -> GND Arduino
SPK_2 -> in - LM386

LM386 pin:
Vcc -> 9v adaptor
IN -> SPK_1
GND -> SPK_2
GND -> GND adaptor

I really need your help, very thankful if anyone wants to help. I am very confused.

Grumpy_Mike

#1
Oct 09, 2017, 06:09 am Last Edit: Oct 09, 2017, 06:09 am by Grumpy_Mike
We need schematics of how you have wired things up not photographs of tangles of wires. I did notice however a total lack of any capicitor, either coupling or decoupling capacitors.

FarizBram

oh, i'm sorry. this is my schematic, thank you

Grumpy_Mike

Their is no amplifier in that "schematic" and nothing showing the power supply wiring.

A schematic shows the interconnection of components, the method yous of drawing that diagram is a very poor way of drawing a schematic.

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