Hi, I was told that I could build this circuit http://uzzors2k.googlepages.com/ET_F...basic-full.jpg
and swap out the MOSFET for a big IGBT I have (FGA15N120ANTD).

However, I was told I would need to use some kind of transistor to switch the gate, and they also said to use 50% duty cycle.

Any help with these 2 things would be appreciated

Dan

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You will need some sort of gate driver for that IGBT. It is HUGE. You can either build your own gate driver circuit (not recommended) or buy one of the many available ICs for it.

Not sure what the 50% duty cycle thing is about.

 

OY! you need a snubber on that... and why on earth to people insist on using 555s for things these days?

you would be better off getting a real regulator chip meant for the job than hacking some crappy 555 ckt to a fet driver.