Sceadwian
Banned
Then as load it can almost be disregarded, but at least we know =) You need a 555 timer circuit that can supply variable duty cycle and frequency in your range (should be easy) you'll want variable duty cycle and frequency simply because the variable part is not that hard to implement and gives you more control, to feed two power transistors in an npn/pnp totem pole configuration from the 300V supply. As far as putting that together goes it shouldn't be too hard, but unfortunately I have big problem with 'vested interest' in projects, as it's not something I want to do it's pretty much impossible for me to actually apply the effort to write the circuit schematic for it. I have a hard enough time trying to motivate myself to get my own projects done => Hopefully other users here will be able to provide more direction now that your actual specifications are known.