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Post by santafe49 on May 5, 2015 9:19:41 GMT -8
 The resistor i have highlighted in the box has 271 on it. Am i to take it the value is 271? What my purpose is, is to cut the leads from the two LED's on the light board and solder the leads from the SMD LED's i have mounted in the Headlight and Taillight holes. I have removed the light tubes from the shell. I am wondering if this is possible or should i try to find the trace before the resistor and place my own 680 ohm resistor inline with each SMD. I am using a Digitrax SDN144 dcoder plugged into the light board. Also, i am not quite sure which side of the led's is the positive or negative. They are 5MM, i think and the flag is clearly visable. |
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Post by Mark R. on May 5, 2015 14:28:05 GMT -8
That's a 270 ohm resistor on the board - see - www.instructables.com/id/Reading-Surface-Mount-Resistor-codes/On the LEDs, the "flag" part of the LED is the negative side. Those are 3mm LEDs. Based on the value of the resistor, I would think you should be able to attach your new LEDs to the legs of the original LEDs after cutting off the light head. Wire the two LEDs on each end in parallel with each other. Personally, I prefer to hardwire the decoder directly and avoid any factory circuitry - that way I know exactly what I'm working with. Mark. |
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Post by santafe49 on May 7, 2015 9:47:35 GMT -8
Thanks Mark. Just trying to make due with what i have on hand. Will give my plan a try and if it doesn't work, well i can give your method a go.
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