Re: [TCML] bifilary primary?

[jhowson4@xxxxxxxxxxx]

I don't have any advice for your project as i have never played with bifilar coils, but that primary looks really nice! 
Do you think you could post a close up of one of the supports? Perhaps I could replicate the style, as I really like them. =) 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off your hands." 

----- Original Message -----
From: "Pete Whitfill" <petewhitfill@xxxxxx> 
To: tesla@xxxxxxxxxx 
Sent: Monday, October 29, 2012 10:17:56 PM 
Subject: [TCML] bifilary primary? 

Hey there, 

Has anyone played with a bifilar primary? Specifically anyone who has worked with stuff 
from DC Cox? 

I have a coil that I built back in '88 as a high school project based on TCBA archives that 
I was able to get back then along with advice (and some parts) from D.C. Cox. It was a 
great project and continues to be a wonderful hobby. 

Back in 2003 I rebuilt the coil somewhat for it to be in a play. I ordered new primary coil 
supports from DC and when I got them, I had trouble making them work right for a single 
flat spiral 1/2" copper primary. Things wouldn't ever quite line up. 

I am now in the process of rebuilding it again(It hasn't run since 2005) and finally I think I 
figured out what the deal is with the primary supports... They are cut for a bifilar coil setup... 
It looks like DC.Cox gave me something I didn't even ask for and I can't wait to experiment 
to figure it out some but I do have a deadline and I gotta get this thing going again... 

Has anyone else played with this? I have put both spirals of tubing in place to fill the supports 
up. My original setup was about 3-3.25 turns of 1/2 copper tubing somewhat placed in these 
supports but not perfectly laid out. Now, there are 2 spirals and each is 3 turns. 

Am gonna try just running one of the spirals only and leave the other one dis-connected at 
first. Then I guess I am gonna try adding the 2nd coil in with various taps. 

Thanks for listening and any advise. Am gonna do mostly low power settings for initial 
tests...Still have to verify the other components are working well after all this time. 

If you wanna see a photo: 

http://www.facebook.com/photo.php?fbid=488232067865013&set=a.431975723490648.91983.100000346710033&type=1&theater 

Best, 

pete 
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