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You could use one charging circuit connected to a bank of capacitors connected in parallel. But if you make it too powerful, the EMP will release everythinh in the spectrum from radio to x-radiation. So if you are in the blast radius, you might end up with cancer.Note: if you do make it powerful. I recommend using a directional antenna
One thing about an electromagnetic pulse, when it pulses is pushes out everything in the range of radio to x-radiation. So if you give it too much power, and if you are in the blast radius, you might end up with cancer