Simple LM386 Audio Amplifier

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Introduction: Simple LM386 Audio Amplifier

The song is:
Infected Mushroom
semi nice

FAQ:

Q: The sound sUxx0rz, fix it!
A: Can't, since there are barely any parts.

Q: How do I add volume control?
A: Either in series with the speaker (volume) or between pin 1 and pin 8 (gain)

Q: Why is there a 7805?
A: To conserve power, you can go without it if you feel like it.

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    93 Comments

    Hey Kirbsome! I got a question. I'm some kind of new in that kind of projects ... So why do other users use Capacitors for their amps, what does that change?
    Best Regards

    Capacitors can do several things. In amps like this one, it's usually
    • To block DC from going through the speaker while passing signal, thereby conserving power.
    • To smooth out power going into the amp, thereby reducing a common humming noise.
    • Combined with a resistor to make a high / low pass filter, thereby making a tone control circuit.
    The reason I didn't use any capacitors for this amp is because I tried using as few parts as possible, but if you want better sound quality I highly recommend them.
    Hope this helps!

    Hey Kirbsome!
    Thank you very much - that helped alot, that was a great reply!
    Have a nice day,
    Lenwo

    To anyone out there :)
    Some of my music has heavy bass, but the amplifier cannot output it properly due to lack of power. Is there a way in which I can "precharge" the amplifier so that it won't lack power when a heavy bass comes?

    Well, it might also be the speaker (small speaker = no bass) but you could always try adding a low-pass filter

    Actually when i use DC adapters capable of delivering 5 volts at higher amperes, the bass is good, that's why i'am sure that its not my speaker. Since i want to create a pocket amplifier, adapters should not be considered as power source, so i want to know if i can create something like precharging the amplifier so that it will be ready for a bass comes.

    Thank you for a reply i'll try putting a low-pass filter. i'll just post here what ever will happen to my amplifier :))

    As stated:
    There's a lack of bass when there's a lack of power.
    The only solution would probably be using some bigger batteries.
    Maybe a DC-DC converter? I don't know.
    But I do want to know how it works out for you :)

    Could you please post schematics for this? Thanks!

    I want to build this into something ( a music led box) i already made, but it has a 12 v power supply. Can i just add this to the same supply or do i need to do something else?