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Hi

I was needing a variable power supply between about 50V and 400V, with a current of only a couple of milliamps, to reform electrolytic capacitors in valve equipment. To do this, I came up with the idea of designing a boost converter using a 555, with a small feedback towards pin 5. However, the problem is that I don't have mosfets that handle those voltages (I only have a couple of IRF630s), but it does have transistors like the 13007, 2SC5353 and RC3866, as well as other small bjts. As diodes, I have FR307. I also have unwound transformers from ATX sources, in a flyback type power supply I find myself more lost.

I would appreciate it if someone could advise me on calculations and design to get the best configuration. [Google translated from Spanish]