LM386 MONO AUDIO AMPLIFIER
![WhatsApp Image 2022-11-29 at 5.32.42 PM.jpeg](/proxy/?url=https://content.instructables.com/FTT/Q3PM/LB28EKEE/FTTQ3PMLB28EKEE.jpg&filename=WhatsApp Image 2022-11-29 at 5.32.42 PM.jpeg)
In this small project we will see the most economical amplifier and with very good audio quality with the CI LM386
Supplies
SCHEMATIC DIAGRAM
![audio1.png](/proxy/?url=https://content.instructables.com/F7W/JYM1/LB28EKF6/F7WJYM1LB28EKF6.png&filename=audio1.png)
This schematic diagram we can see that we will use the LM386 to make our audio amplifier we can see all the electronic components and their respective values
LM386
![pines_lm386_5afe712b75.jpg](/proxy/?url=https://content.instructables.com/FL5/VKSW/LB28EKGH/FL5VKSWLB28EKGH.jpg&filename=pines_lm386_5afe712b75.jpg)
We can also identify the LM386 as JRC386, so you don't get confused, if you see that other name, we are talking about the same integrated.
Do not forget that you should always review the data sheet (datasheet) of any electronic component, since in it you will find exactly the characteristics of the component with which you are working.
This amplifier has support for loads from 4 to 32 Ω, we can find it in three different packages: PDIP, SOIC and VSSOP.
Pines:
- GAIN
- -INPUT
- +INPUT
- GND
- Vout
- Vs
- BYPASS
- GAIN
ELECTRICAL CHARACTERISTICS OF THE LM386
Adjustable voltage gain: 20 to 200 (26 to 46 dB).
Power range:
4 to 12 volts
5 to 18 volts
Depending on the model, it can deliver a profit of:
LM386N-1: 0.3 watts.
LM386N-3: 0.5 watts.
LM386N-4: 0.7 watts.
When the inputs are referenced to ground (ground), the integrated output has its automatic reference to the source voltage.
FUNCTIONING
![WhatsApp Image 2022-11-29 at 5.32.42 PM (1).jpeg](/proxy/?url=https://content.instructables.com/FEL/CCDJ/LB28EKHN/FELCCDJLB28EKHN.jpg&filename=WhatsApp Image 2022-11-29 at 5.32.42 PM (1).jpeg)
This mini-amplifier has as its main component the LM386 integrated circuit. With this IC a gain of 20 can be achieved with a power that can be between 0.3W and 0.8W. You don't need many components and it's easy to put together.
The signal can be entered through pin 3 and the amplified output is through pin 5. The positive supply is made through pin 6 and the ground is connected to pins 2 and 4. The potentiometer allows us to control the input volume .
The power supply voltage can be from 8V to 12V.
ELECTRONIC COMPONENTS
1 DC JACK
1 AUDIO JACK
1 RESISTOR OF 1K 1/4W
1 RESISTOR OF 10 OHM 1/4W
3 CAPACITORS 104
1 CAPACITOR 473
1 ELECTROLYTE CAPACITOR 1UF 25V
1 ELECTROLYTE CAPACITOR 10UF 25V
1 ELECTROLYTE CAPACITOR 100UF 25V
1 ELECTROLYTE CAPACITOR 1000UF 25V
1 TERMINAL BLOCK BLUE 2 PINS
1 POTENTIOMETER OF 10K
1 IC LM386
EASYEDA
![audio3.png](/proxy/?url=https://content.instructables.com/FYJ/0B7B/LB28EKXI/FYJ0B7BLB28EKXI.png&filename=audio3.png)
![audio2.png](/proxy/?url=https://content.instructables.com/F7J/Y2UJ/LB28EKXJ/F7JY2UJLB28EKXJ.png&filename=audio2.png)
Here we will see the design we made in the easyeda software we will see the tracks and the 3D image of how our PCB will look
PCBWay
10pcbs at $5 order them here www.pcbway.com
We thank PCBWAY for the professional pcb they provide us for this project.
GERBER PCB:
https://mega.nz/file/eQRjlLQZ#FemBttBZMnc3QlNYa6QV6lG72Uf6d-TLdrM3wvfvdBk