scr triggering problem

Discussion in 'General Electronics Chat' started by Kaiser Ed Bayawa, Feb 2, 2016.

  1. Kaiser Ed Bayawa

    Thread Starter Member

    Mar 19, 2015
    60
    6
    it would not trigger the gate when I hit the switch.
    can anyone please explain to me why it wont work and suggest some solutions.
    any suggestions would help
    thanks!
    see the picture below
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    What is the SCR part number.
     
  3. Kaiser Ed Bayawa

    Thread Starter Member

    Mar 19, 2015
    60
    6
    BT 151-600R sir
     
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    5,005
    745
    Is it smooth DC or rectified, if its not smoothed the ripples will turn the thyristor off at each cycle.
     
    Kaiser Ed Bayawa likes this.
  5. hp1729

    Well-Known Member

    Nov 23, 2015
    1,963
    219
    The data sheet says max gate voltage should be 5 V, but I don't think that should prevent it from operating. Yes, 120 ohm looks right. You may want to limit the gate voltage.
     
  6. Kaiser Ed Bayawa

    Thread Starter Member

    Mar 19, 2015
    60
    6
    I use bridge rectifier and 1uF capacitor sir. Is it smooth or I should use large valued capacitor?
     
  7. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    5,005
    745
    Last edited: Feb 3, 2016
  8. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    If S2 is closed then I seen no reason that the SCR shouldn't turn on when you close S1. :confused:
    Are you certain that the SCR is wired correctly per its pinout shown on the data sheet?
     
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