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Help me to find values for this UJT circuit

  1. Dec 20, 2008 #1
    guys i want to find values for R2 and R3 in following circuit diagram.is there any equation or method i can use to find this two values? (i was able to calculate R1 and C)
    thanks
     

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  3. Dec 21, 2008 #2

    Defennder

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    Homework Helper

    You want to find values for R2 and R3 such that what conditions are satisfied?
     
  4. Dec 21, 2008 #3
    i'm trying to sesign a UJT oscilator to fire a triac so i can use it as a dimmer.there are no conditions given.
    and after finding R2 and R3 how to calculate peak voltage across R3?
     
  5. Dec 22, 2008 #4

    Defennder

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    Ah, sorry I must have misread it then. Can't help you out here, hopefully someone else will be able to.
     
  6. Dec 22, 2008 #5
    ok thanks
     
  7. Dec 22, 2008 #6

    berkeman

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    Staff: Mentor

    I'm not up on UJTs. Why would that circuit oscillate? Where is the positive feedback?
     
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