How can i mod my guitar amp to light up?

I've been looking at different instructables to make LED's pulse to music, but many of them are very vague and before i buy materials I want to make sure that i'm doing it right. I've included a basic schematic of what i want to do, but I want to know exactly what type of transistor to buy, exactly how to know which terminals on it to connect everything to, how much power i can put through the led's, etc. ALSO i'm thinking of buying the supplies for this off of ebay (you can get 100 LED's for 6 bucks!) but i want to know if the stuff on ebay is quality stuff or not. basically, i have a limited understanding of what i'm doing (I can solder wires, strip wires, and i kind of understand watts, amps, volts) but if you have more electronics experience than me it would be really helpful if you could jump in and tell me how to figure out exactly what to buy.

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frollard7 years ago
Theres plenty of circuits - I'd be worried about anything I built being hooked directly to the audio source because it would probably add some interference to the signal.

Commonly people design the circuit around a microphone near the guitar amp, or use an opto-isolator to ensure there is no direct connection.

https://www.instructables.com/id/Blinking_LEDs_to_Music/ is a good ible - its designed for stereo input - you could use just one stage of the visual amp.

Just make sure you don't go over the amperage rating of your transistor - or use the smaller signal transistor to switch a larger power transistor (if you want to run 100 leds, you need some decent power.

use http://led.linear1.org/led.wiz to design your strings of leds. Don't forget the resistors!