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LED ARRAY Convergence failed

  1. May 30, 2013 #1
    im using falstad

    and my knowledge on circuits is poor or extremely basic..

    $ 1 5.0E-6 34.14951009862697 50 5.0 50
    162 512 288 816 288 1 2.1024259 1.0 0.0 0.0
    162 544 288 896 288 1 2.1024259 1.0 0.0 0.0
    162 576 288 960 288 1 2.1024259 1.0 0.0 0.0
    w 896 288 816 288 0
    g 960 288 960 240 0
    162 512 368 816 368 1 2.1024259 1.0 0.0 0.0
    162 544 368 896 368 1 2.1024259 1.0 0.0 0.0
    162 576 368 960 368 1 2.1024259 1.0 0.0 0.0
    g 960 368 960 336 0
    w 816 368 896 368 0
    g 896 368 896 336 0
    162 512 464 816 464 1 2.1024259 1.0 0.0 0.0
    162 544 464 896 464 1 2.1024259 1.0 0.0 0.0
    162 576 464 960 464 1 2.1024259 1.0 0.0 0.0
    w 816 464 896 464 0
    g 960 464 960 432 0
    I 544 256 544 288 0 0.5
    I 544 336 544 368 0 0.5
    g 896 288 896 240 0
    163 176 128 288 128 0 10 5.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
    R 176 160 160 160 1 2 100.0 2.5 2.5 0.0 0.5
    w 208 96 144 96 0
    w 144 96 144 272 0
    152 144 352 224 352 0 1 5.0
    w 144 272 144 352 0
    w 240 96 240 48 0
    w 240 48 96 48 0
    w 96 48 96 352 0
    w 272 96 272 16 0
    w 272 16 48 16 0
    w 48 16 48 400 0
    152 96 416 176 416 0 1 0.0
    152 48 480 128 480 0 1 0.0
    w 96 352 96 416 0
    w 48 400 48 480 0
    w 416 272 416 288 0
    w 416 288 416 320 0
    w 416 320 416 336 0
    w 416 368 416 384 0
    w 416 384 416 416 0
    w 416 416 416 448 0
    w 416 448 416 464 0
    w 416 464 416 496 0
    w 416 496 416 528 0
    w 384 272 384 304 0
    w 384 304 384 320 0
    w 384 320 384 352 0
    w 384 352 384 384 0
    w 384 384 384 400 0
    w 384 464 384 496 0
    w 384 496 384 512 0
    w 384 512 384 528 0
    w 368 528 368 512 0
    w 368 512 368 496 0
    w 368 496 368 464 0
    w 368 464 368 432 0
    w 368 432 368 416 0
    w 368 416 368 384 0
    w 368 384 368 352 0
    w 368 352 368 336 0
    w 368 336 368 304 0
    w 368 304 368 288 0
    w 368 288 368 272 0
    w 224 352 320 352 0
    w 416 336 416 352 0
    w 416 352 416 368 0
    w 320 352 416 352 0
    w 416 272 416 256 0
    w 416 256 416 240 0
    w 576 288 576 240 0
    w 544 464 544 496 0
    w 384 400 384 416 0
    w 384 416 384 432 0
    w 336 416 384 416 0
    r 576 240 528 240 0 5.0
    w 528 240 416 240 0
    r 464 496 496 496 0 5.0
    w 464 496 416 496 0
    w 496 496 544 496 0
    w 512 288 512 304 0
    r 448 304 480 304 0 5.0
    w 512 304 480 304 0
    w 448 304 384 304 0
    w 576 288 576 320 0
    w 528 320 384 320 0
    w 512 368 512 384 0
    w 512 464 512 448 0
    w 384 464 384 448 0
    w 384 448 384 432 0
    w 464 448 384 448 0
    r 464 448 512 448 0 5.0
    r 512 384 480 384 0 5.0
    w 480 384 384 384 0
    w 544 464 544 416 0
    r 464 416 496 416 0 5.0
    w 544 416 496 416 0
    w 464 416 432 416 0
    w 432 416 432 400 0
    w 432 400 384 400 0
    L 496 192 576 192 0 0 false 5.0 0.0
    w 128 480 224 480 0
    w 224 480 352 480 0
    w 352 480 352 496 0
    w 352 496 368 496 0
    w 576 464 576 512 0
    w 576 512 496 512 0
    w 448 512 384 512 0
    w 176 416 272 416 0
    w 272 416 336 416 0
    w 512 288 512 256 0
    w 512 256 464 256 0
    r 464 256 432 256 0 5.0
    w 432 256 432 288 0
    w 432 288 416 288 0
    g 896 464 896 432 0
    w 496 512 496 544 0
    r 496 544 464 544 0 5.0
    w 464 544 464 512 0
    w 464 512 448 512 0
    r 576 320 528 320 0 5.0
     

    Attached Files:

  2. jcsd
  3. Jun 2, 2013 #2
    I do not know simulation. However your schematic is incorrect.
    Q2 goes nowhere and all connections to it can be deleted.
    There should only be one resistor in series with LED's. (Usually)
    What is LED with no red inside it?
    What are triangles with 2 dots?
    LED's usually take something like 1.5 volt. (1.5 volt is from my memory and it may be higher) Three LED's in series require 4.5 volt. 4.5 volt is too high a voltage to use with 5 volt power supply.
    If resistors are 5 ohm, that is too low a resistance to use with LED's, (Usually)
    Is there a connection missing from bottom resistor?
     
  4. Jun 8, 2013 #3
    ty for your response. Triangles are the inverters, i wanna make the word TEA... but it does not let me do E without the convergence failed
     
  5. Jun 9, 2013 #4
    I goggled voltage red LED. Voltage for red Led is something like 1.8 volt.
    With 5 volt power supply, you cannot put more than 2 LED's in series. One LED would be better.
    Inverters cannot connect to LED's without a resistor in series.
    If all you want to do is spell the word TEA, why don't you do it with resistors and LED's? No computer or invertors required.
    Convergence is failing because current is outside permissible range.
     
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