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what kind of resistor would I need

Greggles_VS

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Wondering what type and ohms resistor I would need to put on 2 50cm led strips with 30 leds each so they don't blow when connected to my 300w max power sub tube? Cheers
 

VEO55

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Are you using LED strip lighting? If so they have a resistor every 3rd LED and you can cut it on the mark. These are stable to use directly to 12V, no external resistors needed.
You are not trying to hook them up to your subwoofer output are you?
 

Greggles_VS

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Yes I'm trying to hook them up to glow to the beat. But don't want to over power them
 

accentstencil

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Yes I'm trying to hook them up to glow to the beat. But don't want to over power them

I'm pretty sure that is not going to work, not much voltage in speaker outputs.
 

Tasmaniak

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There can be a lot... there can be a little... but... lots of factors come into play

First off... your running them from an AC power supply.
Secondly... your sensitivity is going to be up **** creek. Low volume no flash, high flash constant on almost.

Oh and the part you would want is not a resistor but a clamping diode. But this will limit the output to about 10.5V... probably sufficient to run the strips neatly. The other alternative is to build your self a basic little voltage regulator.....

So you would need...

On of these...
W04 1.5A 400V Bridge Rectifier - Jaycar Electronics

Feeding one of these...

1.5KE 13.6V 16ACA Standoff 1500W AC - Jaycar Electronics

Supplying one of these....

MC78T12 12V 3A Voltage Regulator - Jaycar Electronics
Then running straight into the LED strips


Will probably do the trick....maybe. Will all depend on what the amplifier has to say about the impedance...
 

Greggles_VS

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Ahh yes, a diode part way through. So I can get a diode that will restrict flow to a certain amount? Cheers lol I done basic circuits in school but not much
 

Tasmaniak

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A clamping diode essentially happily allows voltage through but then CLAMPS down on the voltage. Unfortunately, the clamp voltage is usually double the rated voltage so it's not ideal in this instance... actually, nothing is ideal in this instance ;)
 
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