Make Your Own LED Sign VU Meter

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Introduction: Make Your Own LED Sign VU Meter

About: Awesome Electronics Tutorials, Projects and How To´s

In this project I will show you how to create a custom LED sign that reacts to the loudness of your music, just like a VU meter does. Let's get started!

Step 1: Watch the Video!

The video gives you all information you need to build this project. But in the next steps you can find a parts list, schematic and reference pictures for your convenience.

Step 2: Order the Components!

Here is a list of all the parts you will need to recreate the project.

Amazon.com:

1x Stripboard: http://amzn.to/1q6WVz3

100x 5mm Green LED: http://amzn.to/1q6X3yr

1x Perfboard with copper dots: http://amzn.to/274wjQY

1x 3.5mm Audio Jack: http://amzn.to/274wv2p

1x DC Jack: http://amzn.to/1q6X999

2x LM324 OpAmp: http://amzn.to/1q6X9pK

1x 47µF Capacitor: http://amzn.to/1rAYQx7

1x 100kΩ Potentiometer: http://amzn.to/1OiIKgt

7x IRFD220 N-channel MOSFET: http://amzn.to/274wH1M

11x 10kΩ, 1x 47kΩ, 4x 1kΩ, 2x3.3kΩ, 3x 4.7kΩ, 2x 2kΩ, 1x 6.8kΩ, 1x 2.2kΩ, 1x 51kΩ Resistor: http://amzn.to/1OiIOws

1x 12V 2A Power Supply: http://amzn.to/1q6Xl8q

1x: Buck Converter: http://amzn.to/1rAYZ3t

Ebay:

1x Stripboard:-

100x 5mm Green LED: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Perfboard with copper dots: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 3.5mm Audio Jack: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x DC Jack: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x LM324 OpAmp: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 47µF Capacitor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 100kΩ Potentiometer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

7x IRFD220 N-channel MOSFET: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

11x 10kΩ, 1x 47kΩ, 4x 1kΩ, 2x3.3kΩ, 3x 4.7kΩ, 2x 2kΩ, 1x 6.8kΩ, 1x 2.2kΩ, 1x 51kΩ Resistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 12V 2A Power Supply: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x: Buck Converter: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

1x Stripboard: http://amzn.to/1Ky7A8A

100x 5mm Green LED: http://amzn.to/1SW1GH4

1x Perfboard with copper dots: http://amzn.to/1WhVmwA

1x 3.5mm Audio Jack: http://amzn.to/1WhVr3q

1x DC Jack: http://amzn.to/1NtXgmx

2x LM324 OpAmp: http://amzn.to/1WhVsnX

1x 47µF Capacitor: http://amzn.to/1SW1Q1l

1x 100kΩ Potentiometer: http://amzn.to/1WhVJXY

7x IRFD220 N-channel MOSFET: http://amzn.to/1TwZeDp

11x 10kΩ, 1x 47kΩ, 4x 1kΩ, 2x3.3kΩ, 3x 4.7kΩ, 2x 2kΩ, 1x 6.8kΩ, 1x 2.2kΩ, 1x 51kΩ Resistor: http://amzn.to/1E9uEhN

1x 12V 2A Power Supply: http://amzn.to/1TwZhPB

1x: Buck Converter: http://amzn.to/1TwZi66

Step 3: Build the LED Sign and the Circuit!

Here you can find the schematic of the circuit and reference pictures. Use those to create your own circuit. The average time to make the LED Sign VU Meter should be around 4 to 5 hours if you do not face any problems.

Step 4: Success!

You did it! You just created your own LED Sign VU Meter!


Feel free to check out my YouTube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information:

https://twitter.com/GreatScottLab

https://www.facebook.com/greatscottlab

3 People Made This Project!

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55 Discussions

Hello Scott, this is great as all of your projects. I am totally beginner in electro (whole life unix programmer:)). I am going to do this for my 2 years old daughter, she loves music, singing (and making lots of noises) so I would like to use a microphone like input, it is possible to do this, please? I think it is but not sure

Please can i have a clear schematics paper.Its all blur.

Hello,

I’ve assembeled this, following the schematic and pictures for reference, but alll my leds are lit all the time, whether an audio signal is connected or not. What have I done wrong?

Any help would be greatly appreciated!

Thank you :)

image.jpgimage.jpgimage.jpg

Clear picture of cricuit diagram

Is it possible to replace the IRFD220 MOSFETs with IRF540? Thanks

1 reply

I decided to test the voltages before I connected the mosfets and the headphone jack has 8v coming out of it

So that if the voltage is too high it won't destroy the leds

Does anyone have the Eagle schematic file that i can have please? The link thats on here doesn't work. Thanks

Can u plz tell me the use of a comparator??

In the scematic u have used 8 lm324 but in the images u have shown there is only 2 lm324.Please help me.Thanks in advancefor ur reply.

1 reply

Lm324 has 4 comparators.. so for 8 such comparators only 2 IC are needed... Check out the pin diagram of LM324

this is your best project with the worst explanation. You can barely see the schematics and you go really fast while soldering so no one can actually see what's going on...

I really don't quite understand what it means by 'Audio' with the little arrow pointing upwards in the circuit diagram. Where is that actually connecting to?

Any help would be appreciated! Thanks.

1 reply