Help me to find values for this UJT circuit

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Discussion Overview

The discussion revolves around finding resistor values R2 and R3 in a UJT (Uni-Junction Transistor) circuit designed for use in a dimmer application. Participants explore methods to calculate these values and inquire about the conditions necessary for their determination.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant seeks equations or methods to calculate R2 and R3 after successfully determining R1 and C.
  • Another participant questions what conditions need to be satisfied for the values of R2 and R3.
  • A participant mentions designing a UJT oscillator to fire a triac for dimming purposes, noting that no specific conditions are provided for R2 and R3.
  • There is a query about how to calculate the peak voltage across R3 after determining R2 and R3.
  • Another participant expresses uncertainty about the oscillation of the circuit and questions the presence of positive feedback necessary for oscillation.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the conditions required for calculating R2 and R3, and there are differing views on the functioning of the UJT circuit regarding oscillation and feedback.

Contextual Notes

Participants have noted the absence of specific conditions for the circuit design, which may affect the ability to calculate R2 and R3 accurately. There is also uncertainty regarding the operational principles of the UJT circuit in this context.

aruna1
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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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aruna1 said:
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
You want to find values for R2 and R3 such that what conditions are satisfied?
 
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?
 
Ah, sorry I must have misread it then. Can't help you out here, hopefully someone else will be able to.
 
ok thanks
 
aruna1 said:
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?

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

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