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[JOPRE]

i did this circuit on general purpose PCB but every time it will burnt the transistor and transformer.

[Mod Edit: Poll Removed]

 

[kubeek]

Why is there a poll with nonsense options?
Regarding the circuit,what transistor are you using and what is the input voltage? Polarity of the transformer?

 

[alec_t]

Success or failure depends greatly on the transformer design/characteristics. Something of a black art. That's why most people choose to buy an off-the-shelf switch-mode power supply rather than try to build their own.

 

[JOPRE]

13001 and s9014

 

[JOPRE]

13001 and s9014 npn transistor