Re: Ganging up trans. safely and correctly

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

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 4/19/01 10:44:44 AM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes: 

>
> Original poster: "jpeakall by way of Terry Fritz <twftesla-at-uswest-dot-net>" < 
> jpeakall-at-mcn-dot-org> 
>
> HI, 
>
> Can anyone point me to a source of info for ganging up OBITs? I wanna play 
> with it, but these two obits are all I have to play with and I don't want to 
> kill 'em. 
>
> TIA 
>
> Jonathan 



Hi Jonathan! 

This is a repost from earlier this year ~(3-5-01). It works for NSTs and 
should work for OBITs. 

        The answer is Very Carefully.   Below is a technique published by 
gweaver-at-earthlink-dot-net.  See his Tesla Ring site for more detail & lots of 
goodies. 
         NSTs are added one at a time. First make sure that the NST's are in 
phase as follows:    
1.     Select one of the NSTs; mark it #1. Connect the primaries in parallel. 
2.     Make a small wire spark gap between the two left-side secondary 
terminals and another between the two right-side secondary terminals. 
3. Apply power. If you get a spark, they are out of phase. Swap the leads on 
the primary of ONE of the NSTs Use a dab of paint (or nail polish, if that's 
your thing) to color-code the primaries so you can disconnect/reconnect them 
without retesting. Color-code the secondaries also. (corresponding primary 
leads black & white, secondary leads red/blue or red/green, mauve/chartreuse 
etc. Just be consistent 
4.      Fasten a 1K-ohm 1/4 Watt resistor between the two "red" secondaries 
and another between the two "blue" secondaries. For 60ma NSTs use 1/2 Watt. 
5.    Apply power.  P= EI 1/4w = 30ma X 8.333 V or 1/2w = 60ma X 8.333V. If 
either resistor gets warm, the output voltages are not close enough (>8v 
diff) to make a well-balanced system. One of the NSTs may act as a short for 
the other. 
For more than 2 NSTs, repeat steps 1 through 5, always testing and coding 
against NST #1. 

Matt D.