In this instructable, I will show you how to put together an analog VU-meter.
You can plug any light in (with the right voltage ofc) and it will work.
A Vu-Meter is simply measuring the volume of the sound, the bigger the voltages, the higher the light will go on the bar. :)
Though, getting it accurate takes calibrating and such, and I will not go over that.
This is as simple as it gets, and it's pretty awesome!
Step 1: Gather your parts!
The main component we are using this time is the "Tip 31C"
Standard transistor, cheap and easy to find.
Use as many as you want!
Then you need just as many diodes + a few spares. (take note of the Vf drop they have, too high, and you can't use many leds with low voltage)
A pcb board.
a pin-breakable thing :^) -- The same thing you use to build shields with.
A potentiometer (100k for this one) To adjust sensitivity on the bar.
A simple switch.
And last but most important, a lunchbox.