“The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display.” Input signal is also limited from 0V to 5V. This is used as a voltage level meter by its linear nature giving exact results if you configure it right. What it means is that it’s an IC that senses different voltage levels and linearly displays those voltage levels on 10 LED. “The LM3914 is a monolithic integrated circuit senses analog voltage levels and drives 10 LEDs, providing a linear analog display.” I used Texas Instrument datasheet page for these parts. They CAN be used for the same purpose like I used just LM3915s for those VU meters that I told about but let’s look at the datasheet for an explanation. But as they are different models one would assume that they have different purpose. Now, you have probably herd of all of them or at least the LM3915 as they are all used for VU meter and alike projects. So the IC of choice is one of LM3914 / LM3915 / LM3916. Resorting to al analog circuitry without any Arduino microcontrollers as that would be another project for another time. So in order to make this VU meter, I’ll be I’ll also be having some video footage for a change. I’ll make a list of parts, buy them and assemble the circuit. I made 3 of these for a Museum’s exhibition about a month ago with schematics from some book or article that I’ll be including in the end, but for this project, I want to dig into selected IC datasheet. So I searched Instructable for a 20 LED VU meter or some sort but with no result. But even for us, it can be dull and having that extra more is much cooler and doesn’t cost that much more. So it’s popular by these 10 LED ones but for professionals, those don’t give much resolution. I’ll show you how datasheet is a very strong and viable tool to work with on your project instead on relying on others(projects).Įveryone knows about a VU meter and for an electronic enthusiast is like an amplifier and a speaker, everyone makes one because it’s fun to look at and you can use it by your radio or amplifier speaker combo. This instructable, I’m going to show you how to make a nice 20 LED VU meter with minimal parts and effort.
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