Re: [TCML] Paralleling 15/30 15/60 NSTs

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Thanks guys.  I'll give it a try this weekend.  I was wondering if there would be some problem with difference in output impedance if there was some voltage-dependent change that caused some kind of dangerous currents between the two.  But I will give it a go.  

I did get the propeller gap working.  It seems a bit more "touchy" than the 4" disk.  I guess that makes sense because minor changes in timing at the motor shaft is multiplied by a 3.5" arm on 2 sides rather than a 1.8" or so inch "arm".   

Thank ye gods for safety gaps.

Cheers

Joe


On Jul 14, 2010, at 6:40 PM, Steve Ward wrote:

> NSTs are a "soft" power source (they have a large output impedance) which
> makes paralleling easier.  Luckily tesla coilers dont need to parallel pole
> pigs, that would be a much more care-requiring feat due to their very low
> output impedance (you could end up with a lot of current circulating between
> them due to mis-match in voltage).
> 
> Ive heard of people paralleling even different NST voltages with decent
> success.
> 
> Steve
> 
> On Wed, Jul 14, 2010 at 7:23 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> 
>> There's really nothing that can go wrong beyond the 50-50 chance of getting
>> the phasing wrong.  Dissimilar current rating ar not an issue.  Even
>> somewhat different voltage ratings are not a deal breaker.
>> 
>> Regards, Gary Lau
>> MA, USA
>> 
>> 
>> 
>> On Wed, Jul 14, 2010 at 6:15 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx>
>> wrote:
>> 
>>> 
>>> I presume that in theory as long as the output voltage is the same I
>> should
>>> have no problem paralleling 2 NSTs with different current ratings.
>>> 
>>> But theory is not reality. And I still have an old 15/30 NST which I
>>> swapped out when I got my 15/60. So I'm staring at it wanting to try the
>>> experiment of paralleling it with its bigger brother. But then I think-
>>> there has to be a problem in this somewhere. Like when you have the
>> variac
>>> at less than full power if the 2 Vin/Vout curves are different.
>>> 
>>> What kind of chaos could I cause by doing this (presuming I phased them
>>> correctly)??
>>> 
>>> Thx
>>> Joe
>>> 
>>> 
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