Re: TI-H: 92 acceleration question


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Re: TI-H: 92 acceleration question



On Nov 19,  1:05am, Wes Mininger wrote:
> Subject: TI-H: 92 acceleration question
> ok, I have a switch accelerating my 92, and this is the problem.  I have
> an 8pf cap in parallel with 3 caps adding to a total of 47pf (the same as
> the original cap) I can switch between both of these just fine, but the
> 47pf side doesnt slow it down to what it was before, so, are 3 caps adding
> up to 47, not 47pf? they are connected in series, so it shouldnt be that
> bad...  for example, integrating 1/(x^7+1) (it gives the same thing back
> because it cant find the answer) takes 1 minute 30 secs with the turbo
> switched on, and 1'45" with it off... ive tried running stuff to check
> that maybe it wasnt just that equation or whatever, but it stays turboed,
> but not quite as much as with the 8pf cap only... any ideas anyone?
>

   Well, an EE will have to back me up on this, but capacitors are the reverse
of resistors, so if adding resistors in series adds up their resistance, then
adding capacitors in series adds their capacitance in the following way:
            1
 --------------------------
  1/C1 + 1/C2 + ... + 1/CN

Putting the capacitors in parallel would add their capacetance C1 + C2 + C3..

   Soooo.. you'll need a set of capacitors setup in a way to flip from 8pf to
47pf, what you seem to have is a set switching from 8pf to 10-12pf (probably
because of the series attaching instead of the parallel attaching).  This would
make sense if you were attaching a 30pf and a 15pf (common values) in series..


   Your message is confusing since it says that you have your caps set up BOTH
as series and parallel.  Be sure which it is, and draw out a diagram of how the
wires and caps and switch are connected to check.

--Bryan
bcturner@eos.ncsu.edu


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