Okay, I have dual Klipsch promedia 2.1 subs, and another one next to a broken driver cone, but a good amp. I be wondering how to determine what kind of LED to purchase to connect to the amp terminal so that he light pulses insync next to the bass. I know I will need a resistor to prevent the LED from burning out, so I guess I necessitate to know what he tolerances will need to be on the resistor and the LED. Does the amp output at 110V AC (probably converted to DC though i guess) Anyways some relief would be great, it seems similar to a very glib project to do for anyone, but I just requirement a little bit of information. Thanks
Answers: You stipulation to know what voltage appears at the speaker leads. If the speaker is 50 watts and 4 ohms the voltage must blossoming at about 14 volts. Most LED's run fine on 20 mA so put a 720 ohm resistor within series with it. If you hold a different wattage or speaker impedance you will need to adjust the resistor a bit. This will get the LED flash in time to the music as it change in volume but it won't brighten or dim much. That requires an added circuit. BTW, audio is AC so your speaker will hold AC on it not DC.
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