Re: [TCML] Bipolar tesla coil

[BrianB <brianb@xxxxxxxxxx>]

Jim,

Thanks for the compliment. Just looked at my drawings and Wow it was back in1999 when I did that . Time sure does fly. 

One thing that is important regarding mirror imaging is the routing of the primary wiring. Each primary coil  is half the inductance so there are fewer turns and the longer primary wiring has greater influence on the small primary coils. Depending on the way the primary wires are routed they can add or remove up to 1/2 a turn from either of the primary coils. Therefore I found it important to wind the primary's in opposing directions and to lead the wires away from them in a mirror image to keep things in balance ( both sides in tune).

Hope this helps...

BTW - Maybe I'll pull the coil out of storage and shoot some nice digital photos of it. 

Regards,
BrianB


On Dec 23, 2012, at 7:02 AM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:

> On 12/22/12 9:04 PM, W5als wrote:
>> Hi
>>   Does any body have plans for a bipolar tesla coil, I would like to build one.
>> I would prefer a table top size.
> 
> do you mean a single secondary with a "top load" at either end? or two secondaries driven out of phase so the sparks go from one top load to the other?
> 
> A lot of the former are mounted horizontally.. search for "horizontal secondary"  on the list might turn up some good examples.
> 
> Brian Basura built a nice version of the latter a few years ago, and there's detailed design information:
> http://www.brianb.org/images/Tesla/Mini-Twin/mini-twin.htm
> 
> I don't know that you need to be quite as obsessive about "mirror images" as Brian was, but there's no denying his works nicely.
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