[Solved] Questions about PUT relaxation oscillator’s characteristics

The pro coder not really xd Asks: Questions about PUT relaxation oscillator’s characteristics
PUT Relaxation Oscillator:

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I have three questions about this circuit:

  1. Why doesn’t the PUT go back to forward bias as soon as the capacitor starts discharging below the trigger voltage? Is it because it discharges before the PN junction goes back to backward bias?

  2. In the CALCULATIONS below, why dors the anode current formula present R1+R2 in the divider? How come the resistors at the right side affect the current of the anode?

  3. I have tried to build this circuit in a simulator but couldn’t find PUTs. Is the only way to add a PUT by building a PUT equivalent circuit?

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