Introduction: Simple DIY Audio Amplifier Lm386

Picture of Simple DIY Audio Amplifier Lm386

In this instructable, we are going to make a simple audio amplifier using lm386. LM386 is low voltage audio amplifier and gain range from 20 to 200. It's a 8-pin ic.

List of components:

1. Breadboard

2. LM386

3. 8 Ω speaker

4. 10k pot

5. 220 uF capacitor

6. 9-volt battery with snip connector

7. Connecting wires

Step 1: Circuit Diagram

Picture of Circuit Diagram

In this circuit our gain is limited to 20 (26 dB). The 10k pot is used for adjusting the volume.

The circuit is self-explanatory

Feel free to comment.


JamesZ16 made it! (author)2017-09-24

Cool little amp. Found my lm386 out of an oldish radio.. and didn't have a 10k pot, so used a 10k resistor instead. hooked it up to various speakers and eventually to and old logitech 2.1 setup for fun. lm386 is mono, but i just keep both inputs for each speaker in the circuit and it works just fine.

most important change was 10uf cap connecting pins 1 and 8 the gain pins for more gain.

if this was all soldered together on perfboard the white noise would be reduced significantly. i have some extra caps and resistors in there to help reduce white noise but don't think they did much.

will probably try to make a stereo setup if i can manage another lm386... or just get a superior IC and actually perfboard it with an internal speaker and female 3.5 output for a versatile little amp.

DanielG63 (author)2016-11-30

What about 4ohms speakers?

Willyd57 (author)2016-11-10

I love this, thanks for posting it. I happen to have two 6 Ohm 6W speakers. Could this circut be modified to use one or both of them?

DIY Tutorials (author)Willyd572016-11-11

You can use one of them.

MuhammedS36 (author)2016-10-08


DIY Hacks and How Tos (author)2016-05-22

Great circuit project. Things like this make great tutorials for an introduction to circuit for beginners.

Thanks mate

About This Instructable




Bio: Loves electronics, science fascinates me
More by DIY Tutorials:ESP8266 Firmware Update Using USB-TTLLED cube using arduinoDIY Jumper Wire Male to Male
Add instructable to: