Need help about switch power supply circuit

[bertus]

Hello,

Q1 and Q2 make a so called PUT.
Look at step 6 of the following page for more info:

Circuit Collection of the Programmable Unijunction Transistor (PUT) .

Circuit Collection of the Programmable Unijunction Transistor (PUT) .: A specific combination of 2 complementary transistors leads to an interesting self-latching behaviour, that can be compared with the behaviour of a thyristor (aka SCR) or, as the title insinuates, a programmable unijunction...

www.instructables.com

Bertus

 

[Delta Prime]

Component selection is critical I need to see a list of the actual components you have selected for your circuit. I know as a hobbyist you may not have this list but you just cannot grab components out of a scrap bin and put it together it will not work.