LM386 Audio Amplifier - Step by Step Tutorial





Introduction: LM386 Audio Amplifier - Step by Step Tutorial

About: Every week two geeky people in Rochester MN spend every ounce of their freetime creating educational videos, podcasts, articles, and music. They publish it all on the internet, free to anyone in the whole un...

The LM386 is a great little amplifier chip that can take almost any audio you throw at it, and amplify it.  So we have here a step by step video on how to set it up on a breadboard and if the sound is something you're interested in, we also have a kit for it!

You can find it here: https://www.tindie.com/stores/tymkrs/

And more information here: http://www.tymkrs.com/kits/lm386kit/



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    11 Discussions

    Here you go!


    can I amplfy microphone sound when I record using pc ?? I mean if there is a way to make a microphone input and the out put plugen in pc not speakers please ,??

    1 reply

    If you combine a Hear me (microphone kit) and the Amplify Me kit, then plug the output of the Amplify Me into your computer, you should be able to record it!

    Hear me: https://www.tindie.com/products/tymkrs/tymkrs-hear-me/
    Amplify Me w/ quarter inch jack: https://www.tindie.com/products/tymkrs/tymkrs-amplify-me-lm386-amplifier-kit/

    or if you want an Amplify Me with an 1/8 audio jack:

    Let me know if this helps, or if you have more questions!

    Is it possible to swap the speaker with a mono jack output and connect the amplifier to a mixing desk (or any other device that handles audio input for that matter)?

    1 reply

    Hi Erik,

    Whisker says it's probably not a good idea. As it's designed to drive a speaker it's designed for a low impedance load, not a high impedance input. So you probably wouldn't want it to drive a line input. Hope this helps!


    Hey! Thanks! This chip is central to the Pixie 2 QRP CW transmitter that I am making and I was looking for some more info on it. Cool to see that you guys are from Minnesta too (pun intended, especially this year!) as I am originally from MN and now in WI. Also nice to see the Maker Movement happening in Rochester. I checked out the links and some of your projects. Nice designs and well-documented on Tumblr. I think there is a low-pass filter in my future...

    1 reply

    Awesome! Yeah it's alive and doing well here in Rochester :) If you search "lm386" and "tymkrs" you'll come across more of the articles we have on the tumblr. And http://tindie.com/stores/tymkrs is where you can find the low pass filter :) Good luck and thanks for your comments!

    "can i use lm386 for amplification of input from electret microphone"...then using a speech filter circuit and send the signal to arduino

    1 reply

    Hmm you probably could. I don't know that we've put a mic to it, so I couldn't tell you for sure. Here's a link to another circuit we've done that an electret mic would be able to be amplified with: http://tymkrs.tumblr.com/post/9168179996/diy-microphone-preamp