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Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
I'm am trying to calculate the resistance of Rt to get 110khz, but before i tried this i was gonna work the given example on the data sheet, It was gonna find the resistance of Rt to get 20khz if Ct = .001uf
here is the equation Rt= 1.1/fxCt
Rt=1/[(20x10^3)x(.001x10^-6)=50k ohms, but the answer i get is... 0
Then i go to a different calculator and i get 3.94796328 × 10-18 blah blah blah blah blah!
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Assuming that you left off a bracket by mistake (there is supposed to be an additional one in front of the =) I imagine you are screwing up the operator precedence (not going to explain that here, just look it up). With windows calculator in scientific mode I'd enter it like this :
20 exp 3 x 0.001 exp -6 = 1/x
Maybe you should just get a graphing calculator where you can enter this kind of stuff as is :)
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
You left out the 10 before the exponent, what would be the value of Rt If i need 110khz and the value of Ct equals .001uf?
Banned on 1/22/2011 for repeated rule violations after multiple warnings. Registered Member #3299
Joined: Sat Oct 09 2010, 08:11PM
Location: Bantown, USA
Posts: 220
10k for 110khz?
thanks man! I'm in 8th grade and i'm not very good at math
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TL949 calculations arn't working out right
