Simple Circuit – Stereo audio amplifier with IC LM386

Simple Circuit – Stereo audio amplifier with IC LM386

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This is an audio amplifier using two National Semiconductor LM386 (Texas Instruments). Basically this involves the use of two amplifiers as posted on another item with a time ago. However this time includes the printed circuit board for stereo version, and power supply. The circuit operates power supply or batteries 6-12 volts. The yield is better when using a 12V power supply and speakers of 8 ohms.

The operation of the circuit is simple and is based on LM386 responsible for amplification, the stereo audio signal is coupled by capacitors C5 and C11, stereo logarithmic potentiometer P1, is used to make adjust the volume. The components connected to pins 1 and 8 control the gain through the use of jumpers, the pin is not connected to pin 8 = Gain 20, pin 8 connected via a 1K resistor and 10μF capacitor gain = 50, only the capacitor to the connecting pin 8 pin 1 = 200 Gain. This way you can configure to meet your needs. The capacitor connected to pin 7 is to prevent oscillation. The output is coupled via capacitor 470μF, if you want to use with headphones add resistors 100 to 220 ohms in series with the output.

Schematic of the audio amplifier LM 386 stereo

Schematic of the audio amplifier LM 386 stereo

Suggested Printed Circuit Board for mounting the circuit stereo amplifier with LM386N

Suggested Printed Circuit Board for mounting the circuit stereo amplifier with LM386N
PCB Copper Side
Suggested Printed Circuit Board for mounting the circuit stereo amplifier with LM386N
PCB Component Side
Suggested Printed Circuit Board for mounting the circuit stereo amplifier with LM386N
PCB Silk

Part list for mounting a stereo amplifier with LM386

Part Value
Resistors 1/4 Watt 5%
R1 560 – Green, Blue, Brown, Gold
R2, R4 1K – Brown, Black, Red, Gold
R3, R5 10 – Brown, Black, Black, Gold
P1 10K – Double logarithmic potentiometer
Capacitors
C1 2200µF/ 25V – Polarized Electrolytic Capacitor
C2, C8, C14 100nF – 100n, 104, .1, 0.1 – Ceramic or Polyester Capacitor
C3, C9 100µF/ 25V – Polarized Electrolytic Capacitor
C4, C10 10µF/25V – Polarized Electrolytic Capacitor
C5, C11 4.7µF/25V – Polarized Electrolytic Capacitor
C6, C12 470µF/25V – Polarized Electrolytic Capacitor
C7, C13 47nF- 473, 47n, 0.047 – Ceramic or Polyester Capacitor
Semiconductors
D1, D2, D3, D4 1N4004 or equivalent – semiconductor diode
IC1, IC2 LM386N-1 – Audio amplifier integrated circuit
LED1 Red Led 5mm
Connectors
AC Connector for 220 VAC power cord
IN Audio input connector
OUT Audio Output Connector
Miscellaneous
J1 J20MM – 20 mm piece of wire
JP1, JP2 Jumper 3 positions
S1 Switch for connect the circuit
TR1 Transformer 6-9 Volts / 500mA
F1 Fuse 500mA
Solder, wire, PCB, Box, Pot Knob, etc..

Download the PDF files to mount stereo amplifier with LM386: LM386 Datasheet, PCB Layout, Layout of components and Silk Screen

Download PDF

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2 COMMENTS

  1. pregunto otra ves que tipo de transformador es, porque no se consigue de 9.6 volt, si no de 6 o 9 volt y si es encapsulado saludos desde venezuela

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