Need help to create LED circuit with microphone signal receiver

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Hello, audioguru!

I'm sorry pal, I'm a Latvian integrated in the UK society My apologies.

Is there any chance you could show how did you made it? I'm ordering right now those resistances, to test them out!
 
I designed and built my "Sound Level Indicator" project 9 years ago and it has operated continuously 24/7 ever since. Its original 9V Ni-Cad rechargeable battery failed after a few years and was replaced by a Ni-MH 9V battery. I hardly ever use the battery, just to demonstrate this project to people who have not seen it before.

When sound levels are low, its gain is 1820 times and when levels become high it reduces the gain to 182 times. Then its total range is 50dB, from fairly quiet to fairly loud. It shows all audio frequencies because it has no filters. The bass beat in music and my dogs barking are the strongest sound levels it shows.
 

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I read all posts again and the vision gets clearer. I'm actually starting believe that this could succeed.
 
Your scheme look a lot like the professor gave me! Damn it, this looks good, but I have a question - In that picture where at each pin LED is attached, could I attach there like let's say 10 LED's? Is that possible?

Thanks for sharing of course!
 
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A red LED is about 2V and a blue, white or bright green LED is about 3.5V. If you use ten 3.5V LEDs in series then the power supply voltage to them must be at least 36V.
I used two 2V red LEDs in series for each LM3915 IC output and they work fine when the battery voltage drops to 5V.
 
Hello! I'm back after some interesting time. I have completely decided to change the way my project will work, because using those microphones makes too much trouble..
Can anyone, absolutely anyone tell me how can I make this -> https://www.youtube.com/watch?t=41&v=b17zd35TTKs using Arduino? I have no clue what to look for but using this device, I could build it up, I guess, easily.
Is there anyone to give a clue?
Much appreciated, thanks you very much!
 
If microphones are trouble, wait for an arduino.

Is this what tickles you ?
----> **broken link removed**

In pounds ----> **broken link removed**
 
I watched the You Tube video of LEDs flashing and music playing. Frequently the sounds and the light did not match so I think there was some cheating. The LEDs flashed mostly during the loudest parts of the music.
Before I made the video full screen beside it on the right there was "Up Next" videos and one showed how to make the EXTREMELY simple circuit on an Instructable that had many electronic errors, another video showed a slightly better circuit two years ago and another video showed a better but still extremely simple circuit 4 years ago.

The circuits are so simple that they might destroy the music player and might destroy the transistor. The Instructable might destroy those two plus destroy the LEDs.
Is that what you want? LEDs blinking only to the loudest sounds? Any sounds?
 
Hmm, that's is something similar what I need (starting from 1 min). How it detects that music? And as I read, it reads only loud sounds, but I need one exact frequency in my project...
 
A very simple circuit can detect the loudest sounds that are usually the bass beat of music.
If you want the LEDs to light only at one frequency then you obviously need a filter tuned to that frequency. That frequency might not occur very often or never, in music or speech.
 
I used a simple RC (low pass) filter with a 450Hz corner to emphasize bass & vocals.

 
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Depending on your bandpass roll off requirements a one or two stage notch filter should give you what you need.
 
Audioguru - what kind of circuit?

Mosaic - could you explain a bit simpler what you said, cuz I have no idea what that means

Thanks, thou!
 
shovs said:
Audioguru - what kind of circuit?
Click to expand...
You can look in Google for a simple lowpass filter circuit to feed this LED driver circuit of mine:
 

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