Re: NST's w/ Dimmer

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>

Hello,
I think one option might be to use one dimmer unit for the adjuster
circuit and the diac, then use two of the large 20 amp triacs available
to do the actual clipping.
I'm not sure how robust the little diacs are that come in the fan
controls, but i would think one could gate two triacs?
This way each transformer would have it's own power control but they
would be gated at the exact same time.
Also, I wonder if a setup such as this could benefit from a smallish
paralleling choke?
Take care,
Marc M.
Geek #1055
http://www.thegeekgroup-dot-org/


Tesla list wrote:
> 
> Original poster: "Chris Sartler by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Chris.Sartler-at-adicon-dot-com>
> 
> Yes , 2 unbalanced x-formers is a bad thing.  I don't know how one would set
> up both dimmers so they would always have the same resistance all the time.
> I do however have some potentional suggestions.  The first would be to use a
> small benchtop variac instead of the dimmers.  There are a few listed on
> e-bay and are currently at a good price. You will need at minium a 10Amp
> 120V model.  Another idea would be to use a 1500W dimmer.  Grainger and
> McMaster-Carr sells these if you are having trouble finding them, however
> they are kind of expensive and are really ment for steady loads like a
> lightbulb or fan.
> 
> chris
> 
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, September 18, 2001 8:07 AM
> To: tesla-at-pupman-dot-com
> Subject: NST's w/ Dimmer
> 
> Original poster: "CJ Moore by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <wizard1234-at-home-dot-com>
> 
> I know this has been brought up before, so correct me if I am wrong in any
> of my assumptions. I was originally going to use 1 1000W dimmer to control
> two 60 ma 9kv NST's but apparently that probably won't work, so I will go
> back to using 2 600W dimmers, 1 for each. My question is how to make the
> dimmers at exactly the same position so that they are operating at the same
> level. I have read that using mismatched transformers is lethal, so I am
> assuming that having the two transformers set to different levels may cause
> problems. Also for wiring purposes is there anything fancy I need to know?
> 
> Here's a link to the control circuit
> www.mariposawomenscenter-dot-com/control.bmp
> 
> Thanks,
> CJ