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Adding LEDs to already existing LEDs on PCB?

Discussion in 'LEDs and Optoelectronics' started by SouthSeaPirate, Mar 12, 2017.

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  1. SouthSeaPirate

    SouthSeaPirate

    4
    0
    Mar 12, 2017
    Hi all, total noob here!
    Im looking at a project and would like to know how involved, if at all possible, to extend LEDs on a manufactured PCM.
    Specifically a home router that has the LEDs directly on the PCB. I would like to add LEDs on a wire set so the LED would be emitting light away from the PCB.
    What is needed?

    [​IMG]


    [​IMG]
     
  2. 73's de Edd

    73's de Edd

    2,886
    1,222
    Aug 21, 2015
    .

    Sir SouthSeaPirate. . . . . . . .aka . . . . . AAAAAAAAAAAARRRGH MATEY !

    Since I am seeing only 7 internal LED's, that would just be a match for this one chip interfacing circuit, that is just stuffed with transistors.
    It would totally snooze on the meager drive currents to each cloned 20ma Hi Intensity LED . . .mounted offboard . . . . .being wire connected .


    Units Relevant Schematic:
    MULTIPLE LED Driver Circuit.png

    IC's datasheet :

    http://pdf.datasheetcatalog.com/datasheet2/f/0c6x6a46ig46qlxf3j2qsaii8o3y.pdf


    73s de Edd
     
  3. SouthSeaPirate

    SouthSeaPirate

    4
    0
    Mar 12, 2017
    Way above my head lol
    So you think I could just wire in 20ma LEDs on each and be fine?
    Can I multimeter the onboard LEDs and get the proper voltage read out?
    Need to know what I gotta buy ahead of time cause I don't live anywhere near an electronics store.
    Thanks so much for the help!
     
  4. 73's de Edd

    73's de Edd

    2,886
    1,222
    Aug 21, 2015
    Sir SouthSeaPirate. . . . . . . .

    Not even scratching the surface of my head . . . . .

    So you think I could just wire in 20ma LEDs on each and be fine?

    NOPE . . . .LED's don't readily share . . . . unless you are OK with . . .vewy-vewy dim..
    You need to use that isolative manner prescribed . . . the original LED's won't EVEN slightly detect the additional remoted LEDs presence and that added set will operate like gangbusters.

    You need to give the supply voltage coming in from the wall wart connector at the top left corner.

    I can see the 1 .8 V and 3.3 supply lines but wonder about the highest DC voltage level present.

    Need a memory refresh . . . . I know about the typical / activity flashing functions, but what are the ratio of lit LEDS to unlit ones ?

    73s de Edd
     
  5. SouthSeaPirate

    SouthSeaPirate

    4
    0
    Mar 12, 2017
    Four of the LEDs would be lit if the there is a signal on the network jacks. Those I dont care about.
    The ones I do care about are the wireless on, DSL, and power on.

    No I do not want dim.

    I misunderstood your first post. I thought you were saying that was the chip inside the router, not what I need to make this work.
     
  6. SouthSeaPirate

    SouthSeaPirate

    4
    0
    Mar 12, 2017
    On the schematic, does 'TO LEDS' refer to patching to the LEDs on the board?
    If so, what side of the on board LEDs to solder to? Assuming it maters.
    'LED 1' and so forth refer to my remote LED's yes?
    What resistors do I need? I see 1/2watt, 1/4watt, etc.

    Sorry, I just dont know this stuff. Im a follow the manual kind of guy, not a figure it out kinda guy.
     
  7. 73's de Edd

    73's de Edd

    2,886
    1,222
    Aug 21, 2015
    Sir SouthSeaPirate . . . . . . . .

    On the schematic, does 'TO LEDS' refer to patching to the LEDs on the board?

    At each of the on board LEDs, they have their current limiting, surface mount resistor being just to their side.
    At that junction is where you would want to solder tack in a small gauge wire
    *** that goes BACK to an associated 47k base resistor.


    If so, what side of the on board LEDs to solder to? Assuming it matters.

    You are soldering to the top, component side of the board

    'LED 1' and so forth refer to my remote LED's yes?

    Yeth


    What resistors do I need? I see 1/2watt, 1/4watt, etc.

    The left set could use 1/4 watt, the right set would loaf with 1/2 watt units


    My personal construction technique would be to use some fine gauge insulated "wire wrap" wire and connect one to each junction and thread bind them and route the amassed cable bunch back to the left side of the board where the IC would be mounted.
    Each wire is then going to its associative 47K res at the IC.

    *** If you have none, the best available source after that would be some of the 26 ga insulated copper wire stripped from a CAT 5 cable.

    Also if you have ZERO pcb fabrication experience, since this is being a linear . . . in one side . . . out the other side, it might incorporate "dead bug" mount configuration of the IC.

    In that situation, the IC is mounted legs up, on a small insulative board with a drop of super glue, and the leads splayed out, such that wire connections can then be made to them . . . . . such as is being seen at the two left leads in the foreground below.

    ILLUSTRATION:

    [​IMG]

    Then, you build up the mounting and wiring of the wire remoted LED's, as you wound have them.

    STILL need the DC voltage level coming from the DC power wall wart connector, as seen at the units left rear.

    73s de Edd


    .
     
    Last edited: Mar 14, 2017
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