![]() Scoring it with a plastic-cutting knife or utility knife and snapping it works OK for rectangular pieces, but that quickly becomes a limiting factor if you want to do more complicated shapes. As I've learned from previous projects, cutting acrylic with a jigsaw is a pain. I have my fingers crossed for this year's Epilog Challenge, as it would be great to have my own laser cutter for projects like this in the future. I also used the UP! Plus 3D printer I won in last year's UP! contest. I owe a special thank you to the SoHa SMART makerspace for letting me use their laser cutter for this project. Head on to the next step for a full materials list - but first, a quick note about some of the resources I used: While there are already a handful of tutorials about using the LM3914, I'm hoping this new one can contribute two things: a very clear explanation of how the circuit works along with assembly instructions, and a way to make aesthetically-pleasing LED towers that will look nice on a computer desktop, instead of just sticking all the LEDs on a breadboard. So, using two of the chips with a simple circuit and stereo sound is sufficient to drive two separate volume towers. The chip can drive a bar of 10 LEDs proportionally to an analog input, with no microcontroller required. ![]() This project lies somewhere in between - it uses a handy "LED driver" chip called the LM3914. ![]() They range from rather simple, like using a transistor to drive a single LED to using an Arduino or a Raspberry Pi to make an audio equalizer. To give credit where credit is due - if you search here, there are a lot of "make LEDs respond to music" type projects.
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