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.
Question for @gunrunnerjohn or @stan2004 does it matter if the board is constant current or constant voltage?
The behavior will be different. If you have a constant voltage supply, the resistor would have to be in series with the power source.
The reason the resistor is across the power source in this example is the supply is supplying a fixed amount of current, so by siphoning off current with the resistor, you have less current for the LED's, hence they are dimmer.
With a constant voltage supply, adding resistance across the power just increases the power consumed, but it doesn't change the voltage until you exceed the current capacity of the power supply, so the LED's are the same intensity. Putting the resistor in series drops some of the voltage and dims the LED's. The value of the series resistor will be dependent on the number of LED's you're powering, since the more current the LED's draw, the more voltage drop you'll have across a given series resistance.
