Last Updated on March 16, 2024
Simple Low Voltage Audio Power Amplifier Circuit designed by using IC LM386. IC LM386 from Texas Instruments is a power amplifier designed for use in low voltage consumer applications. This IC Provides gain value 20 with low external components. By adding addition of external Resistor and capacitor between Pins 1 and 8 will increase the gain to any value from 20 to 200.
IC LM386 Can operate with 4V to 12V and has low Quiescent current Drain 4mA. This IC can give Voltage gain from 20 to 200. It can operate with Battery power also. This IC comes in different package size.
Circuit Diagram
Components Required (BOM)
| 1 | C2, C4 | 10µF | CP_Elec_3x5.4 | 2 | ||
| 2 | C1 | 2.2µF | CP_Elec_3x5.4 | 1 | ||
| 3 | C7 | 220µF | CP_Elec_3x5.4 | 1 | ||
| 4 | C3, C5 | 0.1µF | C_0805_2012Metric | 2 | ||
| 5 | C6 | 0,22µF | C_0805_2012Metric | 1 | ||
| 6 | R1 | 1kΩ | R_0805_2012Metric | 1 | ||
| 7 | R2 | 2.2kΩ | R_0805_2012Metric | 1 | ||
| 8 | R3 | 22Ω | R_0805_2012Metric | 1 | ||
| 9 | D1 | LED | LED_0805_2012Metric | 1 | ||
| 10 | U1 | LM386 | VSSOP-8_3.0x3.0mm_P0.65mm | 1 | ||
| 11 | RV1 | 10kΩ | Potentiometer_Bourns_3214G_Horizontal | 1 | ||
| 12 | J1, J2, J3 | Screw_Terminal_01x02 | JWT_A3963_1x02_P3.96mm_Vertical | 3 |
Construction & Working
This Low Voltage Audio Power Amplifier Circuit can drive 4Ω, 8Ω and 16Ω loud speakers. 6V DC supply used as bias to this circuit, Audio input is applied to the Non Inverting pin through Capacitor C1, Variable Resistor RV1, by changing the RV1 value we can adjust the output volume. Inverting pin of this IC grounded, Gain bypass and gain pins are connected through C4 and R2 components.
Output from Pin 5 is connected to the screw terminal through C7 Capacitor, Here LED indicates the ON condition of this amplifier circuit.
Printed Circuit Board
Low Voltage Audio Power Amplifier Circuit Using LM386 PCB Gerber files.
Interactive Board Viewer
