I am by no means sure that this is the correct approach. No one resistor value will work for all combinations of load. Where did you get the idea that it was?to find he value of dropper resistor from 30v to 15V to 7805 input regulator the +5v supply draws 45mA the 15V draws 20mA in addition to the current drawn by 7805.
to find 30 to 15V dropper resistor: P and R rating
15v to 7805 dropper resistor : P and R rating
Which part consumes what power is up to you. I started with a minimum zener value of 18V and calculated the PD for each part. Since they were unbalanced, I suggested a zener value of 22V or 23V since the ideal value of 22.5 V probably does not exist.can u tell me what is the meaning of "in addition to the current drawn by 7805"...
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