electronic card isssue

Discussion in 'General Electronics Chat' started by sahayaalwin, Jan 7, 2016.

  1. sahayaalwin

    Thread Starter New Member

    Apr 29, 2014
    6
    0
    gud morning

    i have a brake pcb card issue.OPERATION ---variable potentiometer is fitted to card.as the potentiometer is adjusted voltage gets changed dc output ....output is recieved from scr without gate pulse .. 40v transformer output is given to the scr BTI 500R and 2N2646 (UNIJUNCTION TRANSISTOR) is giving gate pulse to scr...so i disconnected the gate pulse but dc voltage output received from scr .so i changed scr too ..but problem repeats...waiting for suggestion....
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,250
    626
    Post a schematic.
     
  3. hp1729

    Well-Known Member

    Nov 23, 2015
    1,963
    219
    What is the original problem? Dead or excessive current? Number one bad part ... capacitors.
     
  4. sahayaalwin

    Thread Starter New Member

    Apr 29, 2014
    6
    0
    dear sir
    DC maximum output voltage is recieved from SCR continuously without the input from the variable potentiometer.but I disconnected the gate pulse of scr too..
     
  5. sahayaalwin

    Thread Starter New Member

    Apr 29, 2014
    6
    0
    [
    dear sir
    DC maximum output voltage is recieved from SCR continuously without the input from the variable potentiometer.but I disconnected the gate pulse of scr too..
     
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