dropping voltage
05-26-2003, 12:14 AM
#1
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dropping voltage
hey I was wondering if anyone in here knows how to drop voltage using a voltage dropping resistor? I need to go from 7.2v to 5.5 or 6v @900mah. if I have it figured correctly I'm looking at 7.5ohm resistor.. Any help???? 
05-26-2003, 03:53 PM
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dropping voltage
because of the voltage I need dropped... 7.2v minus 5.5v gives me 1.7v that needs dropped. If you take 1.7v and divide it by 900mah(the current needed) you get the resistance needed for the dropping resistor. 
that hurt my brain.
that hurt my brain.
05-26-2003, 07:12 PM
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dropping voltage
I got the same as you when I re-calculated. But I set up the circuit on electronics workbench and checked the voltage, I only got it down to 5.5v when I used a 7.5ohm resistor. It didn't match the math, but I haven't seen it be wrong yet.... but maybe I just did.
but maybe I just did.
