View source for LED Music Visualizer (Project 0030)

<small>by Lucas Demetriades</small>
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{{DISPLAYTITLE:LED Music Visualizer}}
[[Category:Projects|LED Music Visualizer]]

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== Project Overview ==

This project adapts work by @saminecca and @LEDartist documented on Instructables.com to construct a simple music visualizer via high-pass filter, band-pass filters, and LEDs. Digital audio is converted into an analog signal to represent frequency (pitch) by color and amplitude (volume) by brightness. 

{{#widget:gallery|img1=https://drive.google.com/uc?export=view&id=1usNAm1nXvx8H3XeRn5wi8QNr5A4qUwKb|img2=https://drive.google.com/uc?export=view&id=1u_84S6bYfbEdwMojU8D9E2lF5Goy0P59|img3=null|img4=null|img5=null|num=3}}

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== Tools and Materials ==
* Circuit Board
* 9 volt power supply
* Jumper Cables
* Three 100Ω resistors
* One 10μF capacitor
* Two N4148 diodes
* Four 10kΩ resistors
* One 2N3904 transistor
* Five 1μF capacitors
* Two 500Ω resistors
* Three 2N3906 transistors
* Six LEDs
* Two 1.5kΩ resistors
* One 180Ω resistor
* One 10kΩ resistor
* One 270Ω resistor


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== Project Files==
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== Step-by-Step Instructions ==

{{#widget:ProjectStep|inst=Construct the audio input. These components account for input impedance and possible DC offset. |src=160VybT0eNQ_lJSMLhb7cELZW2_0mPY1w|show=img}}
{{#widget:ProjectStep|inst=Construct the audio amplifier. This will amplify the signal such that it is useful to the proceeding functional blocks.|src=1jx9Cx2dVeJgnRimjEzKLHcx2pUoFSA-r|show=img}}
{{#widget:ProjectStep|inst=Construct the high-pass filter. This will filter for only high frequencies, which will light according to the volume of high-pitch notes from the input. The cutoff frequency should be 300kHz.|src=1X4E1BV2vqTiZxX8t8OdUu34PoFaWI88t|show=img}}
{{#widget:ProjectStep|inst=Construct the medium band-pass filter. This combines a low- and high-pass filter to filter for only medium frequencies, which will light according to the volume of medium-pitch notes from the input. The low cutoff frequency should be 100Hz and the high cutoff frequency should be 300Hz. |src=1z_ZhtYmk96GulyHQYf2wCEGzSjzOk2p_|show=img}}
{{#widget:ProjectStep|inst=Construct the low band-pass filter. This combines a low- and high-pass filter to filter for only low frequencies, which will light according to the volume of low-pitch notes from the input. The low cutoff frequency should be 15Hz and the high cutoff frequency should be 100Hz. Congratulations!|src=16ZmAba4O7CXPaMNXt11ks2nMZENPyzNH|show=img}}

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