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Thread: DIY TIG Pedal

  1. #61
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,887

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    Quote Originally Posted by BaronJ View Post
    Hi Joe, J&H, Guys,

    I've made the assumption that the internal pot causes the welder output to be maximum amps when the slider is at the VCC end.

    Based on your diagram (Joe) setting the internal pot at a lower value, say half way, would give the finer control of the output from the foot pedal that is wanted by Joe.

    This works because the resistances in parallel provides a lower value resistance with less voltage across it. Effectively a voltage divider supplied by a voltage divider. Which is essentially the circuit drawn by J&H.
    Your assumption is correct: 5V is max current and 0V is min.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  2. #62
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,887

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    Quote Originally Posted by BaronJ View Post
    Hi J&H,

    Having the foot pedal connected and not in use should mean that the internal pot has very little ability to change the current output from the welder. It only starts to have an effect once the foot pedal is used to increase the output, because then the internal pot is supplying the external one and it is this that is now providing the control voltage.
    ....
    When the pedal is not depressed, the welder is 'Off'. There is a microswitch which turn it on as soon as you depress the pedal a fraction....
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  3. #63
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    415

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    Happy to report my pedal works as expected. Havenít welded with it yet but I have since added rubber feet to the bottom to stop it sliding around on the garage floor.

    Looking forward to using it soon.

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