deconstructing a simple circuit

Thread Starter

MDaines

Joined Aug 13, 2010
4
Hi all, I'm trying to learn electronics and have built this simple circuit with a PUT. While I think I understand the logic of this, I am confused about a few things and wonder if anyone could shed some light.

- How were the 15K and 27K resistor values were chosen?
- How do I calculate what the voltage threshold is at the base of the PUT?

Any help is very much appreciated!

Ming
 

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