Re: [TCML] Pig SISG: Destroying the Indestructible

[FIFTYGUY@xxxxxxx]

In a message dated 4/1/08 7:14:46 A.M. Eastern Standard Time,  
teslamark@xxxxxxxxxxxxx writes:

>Based on your data/observations I have the following theory as to  the

>failure mode.  


    Your theory sounds good to me. But I think any  story that starts with 
"Step 1: Secondary streamer hits electronics on  the primary side" is gonna have 
an unhappy ending!

>This explains  how (1) SISG circuit could be destroyed.  Not sure how this

>leads to all circuits on one board being knocked out unless the  initial

>strike took out all (4) TVS on the board associated with the (4)  SISG

>circuits.


The other 3 SISG circuits on the blasted board  are just fine.


>Recently, I was surprised to see much discussion on TCML about a  strike rail

>not being necessary or even a hindrance.  I did not post on that  subject,

>but I think you have demonstrated the importance of having a strike  rail to

>prevent damage to the primary circuit.



    A strike rail wouldn't have done much good - I'm  getting a lot of 
strikes that curve *under* the primary to hit components. I put  steel sheets along 
the sides of the area under the primary, and this has worked  quite well. If I 
was doing a more permanent setup, I'd use aluminum-foil coated  plastic 
sheets, with slots to reduce any "circulating current". The steel pieces  aren't 
getting warm, so there can't be too much power lost through them anyhow. 
    FWIW, the SISG-pig coil seems to tolerate primary  strikes just fine. The 
arc will trigger a breakover from the primary turn it  strikes to the inner 
turns, and the triggered arc is of course quite loud and  bright! This of 
course causes the coil to stumble a little, until it "gets back  in the game" with 
a steady rhythm. 
    I'd really like to know what happened when the  strikes that curled under 
the primary managed to blow up my rectifier legs. But  since I prevented 
that, and substituted bar rectifiers for the blown legs, the  bridge has been fine.
 
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities



**************Create a Home Theater Like the Pros. Watch the video on AOL 
Home.      
(http://home.aol.com/diy/home-improvement-eric-stromer?video=15&ncid=aolhom00030000000001)
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla