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Having trouble visualizing how current flows in a circuit? A great way to get a feel for how a circuit works is to use a circuit simulator, however most are either expensive or require a fair bit of electronics knowledge to use. If you are just wondering how a common circuit works, then you might want to check out this Java-based Circuit Simulator. It’s got a large library of parts and pre-built circuits that you can simulate and modify to get the feel for how they work. Though it may not be a full substitute for more traditional full-featured simulators such as LTSpice or Qucs, it is free, runs in your browser, and is actually pretty fun to play around with. [via Stephen Hobley]


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  1. failrate says:

    $ 1 5.0E-6 1.9265835257097934 49 2.0 50
    r 288 256 288 320 0 33000.0
    v 288 368 160 368 0 0 40.0 9.0 0.0 0.0 0.5
    g 160 368 160 384 0
    t 256 240 288 240 0 -1 2.6738978387767687 1.0266135533359235 100.0
    t 288 256 336 256 0 -1 -0.5538848016578843 -0.5832674769231783 100.0
    w 288 320 288 368 0
    w 288 368 336 368 0
    r 336 368 336 320 0 8200.0
    r 336 320 336 272 0 330.0
    g 288 224 288 208 0
    c 336 320 464 320 0 0.01 -7.979048148214485E-4
    174 464 320 480 256 0 500000.0 0.5099 Resistance
    g 464 256 464 240 0
    w 336 240 336 176 0
    r 336 176 256 176 0 100000.0
    w 256 240 256 176 0
    c 256 176 192 176 0 2.2E-6 0.4226819636085505
    R 192 176 144 176 0 1 440.0 1.0 0.0 0.0 0.5
    174 336 176 352 112 0 1000.0 0.33170000000000005 Resistance
    c 352 144 416 144 0 1.9999999999999998E-5 -0.6904784819613655
    g 416 144 416 80 0
    g 336 112 336 80 0
    w 480 288 528 288 0
    o 22 64 0 35 10.0 9.765625E-5 0 -1
    o 16 64 0 35 2.5 3.90625E-4 1 -1

  2. PaulBo says:

    This is great! What a lovely way to build up some intuition and even test out a few circuits.

  3. Sander Duijff says:

    Jeee Thanx for the app!!! I hope you can keep it online…