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26th May 2005, 12:12 PM  #1 
diyAudio Member
Join Date: Sep 2001
Location: Pickering, Canada

Anyone major in maths? please correct this
See my calculation here:
L=2.91mH C=68.2pF + 180pF=248.2pF L=2.91mH=0.0291H C=248.2pF=0.0000000002482F Rs=sqrt(L/C) Rs=sqrt(0.0291/0.0000000002482) Rs=sqrt(117244157.937147461) Rs=10827.9341 Cs=[2*pi*sqrt(LC)]/Rs Cs=[2*(22/7)*sqrt(0.0291*0.0000000002482)]/10827.9341 Cs=0.000000000156010404798 If 10^9 = n Then Cs=1.56nF So I get Rs=10k8 Cs=1.56nF Sorry that I have only O level maths and that was grade B I got many many many years ago!!
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26th May 2005, 12:31 PM  #2  
diyAudio Member

Re: Anyone major in maths? please correct this
Quote:
btw, a scientific calculator makes life a lot easier  and the Texas Instruments version can even talk to your DVM. (I am embarrassed to say that I use an HP41 which is over 20 years old.) four decades ago when I took physics and calculus we had to do this stuff with a book of logarithms and a slide rule. jack 

26th May 2005, 12:42 PM  #3  
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Join Date: Aug 2004
Location: Behind you

Re: Re: Anyone major in maths? please correct this
Quote:
I have a notsoold TI86 myself, although I never use it anymore, instead preferring to use 'Virtual TI' (a TI calc emulator for Windows), since it is far faster than any real calculator.
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26th May 2005, 08:36 PM  #4  
frugalphile(tm)
diyAudio Moderator

Re: Re: Anyone major in maths? please correct this
Quote:
My HP is virtual these days (althou i have a rarely used HP (maybe 15 years old) somewhere in the lab  needs fresh batteries) dave
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26th May 2005, 09:08 PM  #5 
diyAudio Member

I told my kids I had to get an RPN calculator as my mom is Polish. I used to program little magnetic tapes  worked out the tractrix horn formula in RPN.

26th May 2005, 09:29 PM  #6  
frugalphile(tm)
diyAudio Moderator

Quote:
dave
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27th May 2005, 10:44 AM  #7 
diyAudio Member
Join Date: Feb 2005
Location: nr LongHope, Glos. UK

RPN
I am an RPN addict and simply cannot use anything else than an RPN. And I use my trusty HP32SII because it's awake INSTANTLY when I need it; I do not have to PLEASE WAIT for anything to get it's act together.
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27th May 2005, 12:47 PM  #8  
diyAudio Member

Re: Re: Re: Anyone major in maths? please correct this
Quote:
I can beat that. 1978 Casio fx451 scientific calculator with Solar Cell  27 years of calculation with zero batteries  and I have two of them! Jan Didden
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