I want to know if i can use this circuit to Drive an fet with a 555 and use a different power source not the same one that powers the fet.
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Why is that a problem?The problem with your voltage divider network is that it is in parallel with your load and you have still not accounted for this!
You will certainly overvoltage the 555 during the low current intervals. Better to use a transformer and totally exclude the voltage divider.Why is that a problem?
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