If you’re looking to connect different colored LED lights on a single strip, you’re going to run into series/parallel SMD LED wiring issues.
In short, the power supply must be equal to or more than the sum of the voltage requirements, per LED and its resistor. When you want to mix colors and wire them in parallel, then you need to add resistors to each LED, which levels the amount of power required to light the LEDs.
It’s important to remember that colored LEDs have different voltages and therefore require more or less of a power source and also that when you wire in parallel, you have to split the positive and negative lines into multiple wires.
Joined: Jul 05 2012
Thu Jul 05, 2012 5:18 pm
I have purchased a number of different colored SMD LEDs. The idea is to wire them together to have them on a single strand alternating colors for decorative lighting . I have tried both wiring configurations. On any given attempt only 1 LED in the chain will light. Seems to be the one at the end (Red Blue Green etc.). I have tried different power 3-9V and resistors. Again same results. The LED types in most cases have differing forward voltages. I’m not sure if that matters.
Can only the same color / type leds be in a single chain?
Any insight is welcome.
Joined: Sep 06 2012
Thu Sep 13, 2012 10:24 pm
You can connect the SMD LED in parallel method. Parallel means that instead of wiring LED to LED, eachLED or small group of LEDs gets its own ‘line’ from the power source. You can combine this idea to make parallel wiring of LEDs in series to get past the forward voltage issue. In that case, you could use two resistors for two LEDs per parallel line, but the wiring is just a little different. You could also use three LEDs on one parallel line and a singleLED on a separate line. Parallel lines give you the same voltage as a single line did, but it does add to the total current drawn through your circuit. Wiring in parallel just means you have to split the positive lines and negative lines into multiple wires.
Joined: Feb 12 2003
Thu Sep 13, 2012 11:19 pm
Aaaaaaand there’s what we suspected. Please keep your advertising links off the message board.