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Arc Welder Simulator

Discussion in 'General Electronics Discussion' started by Robert Byrne, Nov 10, 2015.

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  1. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Hi guys
    I'm just wondering if anyone has done a circuit using the 555 chip to simulate an arc welder. I'm a modeller and I was hoping to make a circuit for an engine shed to make it look like there was welding or cutting taking place inside.
    Thanks
    Robert
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    A 555 will give you a much too regular blinking instead of the irregular flickering of an arc welder. Googling "arc welder led simulation model" turns up a few hits, e.g. this one. The PCB for this circuit is no longer avaliable, but protoboard will be fine for its construction.
    Or try this site which seems to offer kits, even including sound :cool:
     
  3. Martaine2005

    Martaine2005

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  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    2 minutes slow, Martin :p
     
  5. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Thank you guys, I was hoping to build one rather than buy, just for the challenge, I had ordered some 555 chips as I thought they might work. Is there any other chip I might use? I thought if I were to change around the capacitor and resistors I could speed up or slow down the flickering. I could be wrong tho.
     
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  6. Harald Kapp

    Harald Kapp Moderator Moderator

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    Link #1 in post #2 shows a circuit you not only can but have to build as the PCB is no longer available.
     
  7. Martaine2005

    Martaine2005

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    You can speed it up and slow it down!.
    But only on / off faster or slower.
    Check out the web site Talkingelectronics.com and look at rail road electronics.

    Martin
     
  8. Martaine2005

    Martaine2005

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    Lol, only 1 minute slower that time Mr H!

    Martin
     
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  9. Martaine2005

    Martaine2005

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    [​IMG]
     
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  10. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Thanks very much guys, that one does some extremely hard and difficult, I don't know if I could do it, I do have some strip board but I wouldn't know where to start.
     
  11. Bluejets

    Bluejets

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    Robert Byrne likes this.
  12. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Brilliant guys thanks for all your help, I really appreciate it.
     
  13. Colin Mitchell

    Colin Mitchell

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    The $6.00 kit is very unrealistic.

    You can buy a flickering LED for $1.00 and drive another super bright white LED via a transistor to get a much better effect.

    This very simple circuit replaces a very complex circuit because all the random flashing is done via a microscopic microcontroller inside the flickering LED.
    These LEDs can be purchased on eBay and you can contact Colin Mitchell for the link.
    The super-bright white LED flashes much more than the flickering LED because the transistor and the 1u electrolytic picks up the pulses (the waveform) across the 470R resistor and only the main changes are transferred to the white LED.

    ArcWelder.gif
     
    Last edited: Nov 12, 2015
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  14. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Would you put it in parallel? What resistor would you use?
     
  15. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    I was going to buy some of the flashing led but I was unsure if I'd be able to adjust how fast it flashes. It's a great idea tho
     
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  16. Colin Mitchell

    Colin Mitchell

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    It's not a flashing LED but a flickering LED.
     
  17. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Oh I thought it was the flashing ones, do you think the flickering would work? I thought they might be like those tea cup candle lights(battery operated) and not fast enough
     
  18. Bluejets

    Bluejets

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    Does one strip the LED out of the candle fittings as I cannot see any seperate flickering LED's shown on Ebay.
     
  19. Robert Byrne

    Robert Byrne

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    Nov 10, 2015
    Brilliant Colin thank you, which type is that transitor? PNP or NPN
     
  20. Harald Kapp

    Harald Kapp Moderator Moderator

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    BC547 is NPN, as shown in the diagram. If you want to bild circuits from scratch, you need to know at least the basic symbols.

    Give it a try. Using a white LED may make the effect look entirely different from what the yellow LED in teh canlde let's you assume.

    Yes, that is a possibility. And given the price for a complete "tealight" probably not much more expensive.
     
    Robert Byrne likes this.
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