LM386 + Electret Mic + Arduino

An Arduino reads the analogue signal from the LM386 amp and displays the voltage level on some LEDs.

No schematic is available for this exact version but the schematic for the amplifier used with the microphone is available here:
https://randomskk.net/projects/lightstrip/schematic.pdf
The amplifier is the middle part.

Category:

Science & Technology

Tags:

• arduino
• led
• electronics
• lm386
• amp

[AMDkicksass]

damn your camera has a nice mic what make/ model is it id like 2 buy one down the road

[randomskk]

This video was taken with a Canon G7, now superseded by the G10 (or possibly even further than that, since). The G7 should be fairly cheap by now.

[chainsawz]

you didnt use the electret mic ???

an arduino is also called a V-U meter,

theres a special IC you can use for that called the LM3915, thats what i used...

how reliable is te LM386 i am planning to use it in a project at college?

[randomskk]

the '386 is fine as an amplifier, the main issue is the microphone. It is sensitive enough to pick up loud sounds and that's good enough for synchronising to loud music but it's not great for quiet noises and doing detailed analysis on any sound is going to be difficult as it is quite a noisy signal with a low sample rate. Both could be improved with better design and hardware though!

[randomskk]

it's an hour long drum mix track a friend sent me ages ago, I don't know anything more about it (no metadata) and it's unfortunately far too big to upload.

[randomskk]

The first four are always on because that's the base volume level of the microphone, and while a trimpot would help, the far easier solution would be to just subtract that base volume level from the analog value the Arduino reads - no extra hardware needed. This was just a proof of concept and to get the microphone working, so I didn't bother - the final use of the microphone has just one LED essentially, see my other video.

[1234ted4321]

Can you give a circuit diagra?

I want to make one.

[JonDeth]

And yet no shortage of self proclaimed audio tech specialists online in the DIY community telling everyone the LM386 lacks the gain to perform as a mic preamp. The thing is so damn LOUD odds are you'll cook the input balance resistor on a lot of mixers if you run it wide open with the gain at 200X.

Anyway you can build a peak meter muuuuuch easier with another LM386 tapped into your mic output feeding however many LED's you want, in series on it's output with a trim pot for calibrating.

[Superchargered88]

hi,can you tell me how can i make a led meter responding to the sound from around? like claping hands... tkanks

[TheFulun]

работают ток 3 светодиода....

[myguitardidyermom12]

jungle beats yo.

[TheLxrz]

bad video, sorry that vu meter is bad

[riky22lou]

bro, what about using microphone to take sounds and

directly amplify it into earphone, man, it will be

cool, what do u think, man, i got this link as well,

ur video inspired me to google it.

redcircuits. com//Page38.htm

what do u think about this circuit, man?

[anarkia1ces]

The range is sht. Only 3 leds have activity. Try again

[q7spiz]

This thing can be used to further measure mixdowns.

[rafhit]

i would say that the music is from gantz...