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Reply to "Another LED constant lighting question for passenger cars . . ."

GregM posted:

Here is a picture of where to connect the resistor to the LED strip.  I show a through hole resistor but a surface mount might be a better option if soldering to the LED strip.

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Question for @gunrunnerjohn or @stan2004 does it matter if the board is constant current or constant voltage?

1206 shunt on led strip

Right.  An SMD resistor might be easier to install and more tidy...of course you must have suitable eyesight to deal with tiny components!

So a couple comments about using an SMD resistor.  You want a power handling capability of 1/4 Watt or more (this also applies if using a leaded resistor as in GregM's photo).  In above photo, I show a "1206" size (.12" x .06") SMD resistor which is 1/4 Watt.  The value is not a 2K but this is for sizing only.  They are only a penny each on eBay but may be difficult to install since they just barely "straddle" the copper islands on the LED strips.  I'm sure you could do it but may get frustrating applying huge blobs of solder.  Your mileage may vary.

That said, you can also get slightly larger SMD resistors.  For example a "2010" size (.20" x .10") would nicely straddle a pair of copper pads and be easier to solder to the pads..as well as being physically larger and hence easier to see and manage!  A tad more expensive at 5 cents each so you may need to save up your allowance.

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This resistor shunt method for dimming only works for constant-current boards like GRJ's lighting module.

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  • 1206 shunt on led strip
Last edited by stan2004

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