[TCML] Paralleling 15/30 15/60 NSTs
joe at killerowls.com
Thu Jul 15 21:09:42 MDT 2010
Phased the 2 NSTs via the www.geekgroup.com method. Spliced them together and gave it a shot. Only had the variac up about 1/2 way and I was getting pretty good sparks. I was afraid to go further because I haven't yet increased the MMC. I have all the 942 caps, just need to get behind the drill press and get to work this weekend. I also have to pretty up the whole power supply because I just stripped various wires and tied things down un-workmanlike. So no pictures until it's beautiful.
But the paralleling works well even though one is a 15/30 and the other is a 15/60. So now I have a 15/90.
So, I'm looking for further guidance here....at some point you stop making it bigger, right? Because I honestly see no end to my desire to keep tweaking and bringing up the power one quantum at a time, and making new spark gaps, and experimenting with break rates and architectures and endless refinements. I'm frightened by John's web site where he chronicles an angry neighbor attack. I would not be as lucky. With my hood, a neighbor would rush the running coil with a piece of steel conduit and get himself zapped before destroying my coil by collapsing into it with fibrillations.
So I'm trying to figure out when is a good time to stop with the power boosts - but I can't see the end right now.
My wife is already looking for a 12-step program for coilers and working to set up an intervention.
On Jul 14, 2010, at 8:31 PM, Joe Mastroianni wrote:
> 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.
> 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
>> On Wed, Jul 14, 2010 at 7:23 PM, Gary Lau <glau1024 at gmail.com> 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 at killerowls.com>
>>>> I presume that in theory as long as the output voltage is the same I
>>>> 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
>>>> 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
>>> Tesla mailing list
>>> Tesla at pupman.com
>> Tesla mailing list
>> Tesla at pupman.com
> Tesla mailing list
> Tesla at pupman.com
More information about the Tesla