[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: tesla-at-pupman-dot-com*Subject*: Re: Tesla calculator frustration.*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Wed, 30 May 2001 21:52:55 -0600*Resent-Date*: Wed, 30 May 2001 22:13:10 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <scmVoB.A.lVE.TTcF7-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net> Hi Bill, Tesla list wrote: > Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>" <vanyo-at-echoes-dot-net> > > This really should be quite simple, but no... > > I just want to calculate where I *should* tap my primary, given the > following: > Cap: 0.06uF > Primary: Inner diameter = 9.75", 1/2" spacing (center to center), 1/4" > tubing > Secondary: 1000 turns, 27.625" winding length, 6.625" diameter. > Topload: 8" chord, 23.5" center to center (capacitance = 34.845?) I assume your using 24awg wire size when I calc'd this. The toroid capacitance by itself would calc to 34.8pF, but when the toroid is set on top of the secondary, the frequency will increase possibly by as much as 15% and the effective top capacitance appears to effectively decrease by as much as 5 to 40% with a single toroid. This is hard to calc. E-Tesla6 is the best method at this time for extrapulating this information. I did however use JavaTC to look at it: Here's what I got: Inductance Ls: 35.92mH Medhurst Capacitance: 12.4pF Loaded Resonant Fr: 122.2kHz Primary Tap at 7.59 turns Now, these numbers are just the basics and I did not take into account the effective change in Ctop. If I assumed a 12% reduction in toroid capacitance, then Ctop would be 30.6pF and the following occurs: Inductance Ls: 35.92mH Medhurst Capacitance: 12.4pF Loaded Resonant Fr: 128.1kHz Primary Tap at 7.26 turns Note, I picked 12% in keeping with Terry's post of 128kHz. However, you should be the one running E-Tesla6. The output data should be even more accurate for you as you wouldn't have to guess at numbers as we do to fill in the blanks. JavaTC has been updated (fixed some spacing errors which John Corture pointed out). http://www.classictesla-dot-com/java/javatc.html It should do fine now, but I don't have an input to "reduce" the top capacitance yet. If you were to use JavaTC and wanted to drop Ctop by some percent, then simply reduce the toroid inputs to attain the desired capacitance. I will be adding another input into JavaTC soon for % reduction in effective Ctop one of these days soon (maybe tonight?). Also, use E-Tesla6. It's a great program and one of kind. If you need any help using it, just ask. Take care, Barton B. Anderson > > Previously (with a smaller topload), I managed (or so I thought) to do > the calculation using JHCTES version 3.2, at > http://www.miramarcollege-dot-net/faculty/jcouture/tesla/ > > but now I can't see how I ever did it. The weird thing here is that > what I would logically like to specify as input parameters, like primary > interturn spacing, are output parameters. I have to try to adjust the > input parameters to get output parameters that match my existing > primary. > > I've also tried E-Tesla 5 and 6 - got significantly different results, > and don't quite see how to calculate my tap point anyway. > > Are the specs I've listed sufficient for calculating the tap point? > > Another question, about toroid topload shape: I made mine from 8" dryer > duct and two 16" pizza pans, but the pizza pans are about 4" apart. > Should that be a problem? Any idea how much that affects the toploads > capacitance? > > Thanks again, > Bill V.

- Prev by Date:
**Re: Depotting a resin-filled tranny** - Next by Date:
**4KV-at-1A Transformer on eBay** - Prev by thread:
**Re: Tesla calculator frustration.** - Next by thread:
**RE: Tesla calculator frustration.** - Index(es):