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<blockquote data-quote="keep_hope_alive" data-source="post: 7820074" data-attributes="member: 576029">I put two led&#039;s in the port. they strobe with the music, since they get their voltage from the amp. I used a Zener diode in parallel with a led and a 120 ohm .5W resistor. finally, another 120 ohm .5W resistor is in series with this combination so the current is controlled when the Zener opens and the sub still gets almost all of the power.*I can draw this up later.&nbsp; The voltage rating for the Zener diode and the LED resistor determines the drive current for the LED.&nbsp; You first choose the LED you want to use, then the voltage drop and drive current rating determine the Zener diode rating and the resistor size.<img src="http://carphotos.cardomain.com/ride_images/1/1351/2341/3376170067_large.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://carphotos.cardomain.com/ride_images/1/1351/2341/3376170068_large.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="keep_hope_alive, post: 7820074, member: 576029"] I put two led's in the port. they strobe with the music, since they get their voltage from the amp. I used a Zener diode in parallel with a led and a 120 ohm .5W resistor. finally, another 120 ohm .5W resistor is in series with this combination so the current is controlled when the Zener opens and the sub still gets almost all of the power.*I can draw this up later. The voltage rating for the Zener diode and the LED resistor determines the drive current for the LED. You first choose the LED you want to use, then the voltage drop and drive current rating determine the Zener diode rating and the resistor size. [IMG]http://carphotos.cardomain.com/ride_images/1/1351/2341/3376170067_large.jpg[/IMG] [IMG]http://carphotos.cardomain.com/ride_images/1/1351/2341/3376170068_large.jpg[/IMG] [/QUOTE]

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