LED BusyLamp holder/stand

thingiverse

My office wireless headset comes with a nifty accessory called a BusyLight that shines brightly when I'm on a call. They're asking $47 for it, which seems like a pretty penny. So, I whipped out my trusty oscilloscope to take a closer look at the headset's voltage output while it's in use. As it turns out, it puts out 3.9 volts DC when I'm actively using it. To make this work, I designed a simple LED circuit that consists of one high-brightness LED and a resistor connected to a cable running all the way back to my headset's base station. Here's how it works: When I'm on a call, my phone sends out 3.9 volts DC through the cable to an LED and resistor combo sitting right on top of my desk or cubicle wall. The idea is that anyone walking by can see that I'm already on a call, so they'll know not to interrupt me.