Dex,Another aspect I wanted to point out (sorry for all the posts). When it comes to 1MHz range coils, either 1KW size or the normal tiny small types, the tuning response is tight. A little Lpri adjustment makes a big difference in Fres. One of the real problems here is that the lead inductance (wire to and from the primary connections, cap inductance, etc..) makes a far greater affect on Lpri than a typical coil. Those particular inductances must be accounted for or you will drive yourself nuts trying to get it tuned. When it comes to lead inductance, any typical straight wire inductance formula will do fine (to add to the primary L). Javatc has inputs for lead inductance and accounts for the lead inductance regarding tuning. Small little high frequency coils is why I inserted this relationship in Javatc, but I guess it would also come in handy for 1KW coils also considering turns will likely end up quite low on the primary.
In any event, it's just something I want to make you aware of. For the normal high turn coil, that small inductance can be disregarded as it's ratio to primary inductance is very low. In MHz range, that particular lead inductance plays a far more vital role and becomes worthy of attention.
Take care, Bart Dex Dexter wrote:
Thanks for the photo. I think power source for the coil I want to build is a potential transformer. And I'm thinking of use ASRG with 300-400 PPS.Cp about 10 nF. Still thinking of how to realize good 40 kV capacitor bank for the purpose. Dex --- bartb@xxxxxxxxxxxxxxxx wrote: From: bartb <bartb@xxxxxxxxxxxxxxxx> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> Cc: Subject: Re: [TCML] 1 Mhz ,1 kw Date: Sun, 22 Mar 2009 08:41:26 -0700For myself, I have built something close, 750kHz coil. It was one of these small little coils with a lot of losses and problems. The only image I have of it is here (it just happened to get into the photo). It's the little coil on the right side of the picture. It was built for a buddy down the street (little 7500V, 20mA NST coil).http://www.classictesla.com/flat/Img_3002fast.jpg Take care, Bart _____________________________________________________________ Washington DC's Largest FREE Email service. ---> http://www.DCemail.com ---> A Washington Online Community Member ---> http://www.DCpages.com _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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