Recent content by anakinjay

fantastic! I'll definitely use a fuse, and I'll be sure to post pics when I get it all finished. Thanks for all your help guys! Much appreciated!

Do I add them up? if so then... Each LED has a voltage drop of 3.3 3.3 x 21 = 69.3 that would give me .7 volts going through the resistor... The LED's use 20ma (0.02 amperes ) so: R = .7/.02 So that's 35ohms? and P = .7^2/35 So the watts would only need to be .014...

Well, I'd probably be happy with just a soft glow, and then on when the guitar is playing... I'm not looking for anything complicated like an EQ :) Here's an example: http://www.instructables.com/id/Sound-reactive-led/ this guy is just wiring the led straight up to the speaker...

again, total noob here... but in p = v2/r wouldn't you add up the total resistance of all the LEDS as well as the resistor? that would make r around 593.4, and would put total watts at around 8.25'sh?

There's a good chance you're right... like I said, never worked with anything this high voltage / wattage before... Here's the array I get from the LED cacluator: Solution 0: 21 x 1 array uses 21 LEDs exactly...

Ok, just a warning... I'm an amateur engineer... I do things as a hobby (computer programmer by trade) Anyways, Here's what I'm doing: I'm trying to mod a guitar cabinet with LED lights that pulse with the music. I want to power it from the signal that comes into the speakers from the power...