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

To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Paralleling 15/30 15/60 NSTs
From: Miles Mauldin <TeslaMiles@xxxxxxx>
Date: Fri, 16 Jul 2010 06:04:41 -0700 (PDT)
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Ha! I hear you. Terry Fritz's filter design handles up to 240mA and without going back and redesigning it that's my stopping point. Er, until I get a little piggie, and more, and more stuff....

Best Regards,
Miles

Sent from my iPhone

On Jul 15, 2010, at 11:09 PM, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:

Hi All,

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.

;-)
Joe

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.

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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