Re: Dimmer Differential

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Terry, list,

Tesla list wrote:
> 
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Luc,
> 
> I finally see what you mean now *:-))

 It's so hard to explain my thought in english sometime, but the
exchange I have with all of you are so enriching that I persevere
to write my bad english. I take some english courses in my life
but it's a lost cause. I appreciated that nobody ever make fun of
it here.


Cheers,

Luc Benard
  
> 
> A 1mS delay or instability is a bit of a concern on a finely tuned LTR coil
> but not a "big" problem.  It would tend to cause a little instability.  I
> am not sure what causes it but maybe modeling could predict the effects.
> It should be looked into and eliminated if it can be.  I assume the diac or
> trigger in the dimmer is more sensitive in one direction than the other...
> 
> Cheers,
> 
>         Terry
> 
> At 01:13 PM 10/25/2001 -0400, you wrote:
> >Hi Guy,
> >
> >Couple of week ago I posted here that I used a
> >"dimmer-cap-ignition coil" circuit to drive a fluorescent as
> >strobe to checked a sync motor I rebuild. The result I got was a
> >double pattern, many possibility existed that could cause this
> >double pattern. The first 2 things I suspected was bad bearing in
> >the motor or problem with the dimmer circuit. With the help of
> >Terry I finally find that the problem come from the dimmer
> >circuit. If you check the dimmer reading from a previous
> >experiment by Terry you'll see that the conduction on the
> >negative part of the 60Hz cycle is later than on the positive
> >part:
> >
> >http://hot-streamer-dot-com/temp/CoilTest/ACin3with20uFcap.gif
> >
> >By the number of degree I have between the 2 patterns on my sync
> >motor I calculated around 1 mS of difference, in the Terry
> >reading I calculated around .7 mS. It probably could explain
> >Partially why some of you report erratic firing with TSG, I
> >remember Marc reported that he have only 60 pulse/seconde in his
> >first attempt with the TSG, that could be part of the explanation.
> >
> >I'm sure that for most the time this condition is not a problem
> >in tesla application, many people have great success with TSG.
> >
> >This should raise a question: Is this difference stay the same
> >independently of the position of the adjustment knob on the
> >dimmer, is all dimmer are the same regarding this delay and is it
> >a condition cause by the dimmer itself or by the "cap-ignition
> >coil" part of the circuit ?
> >
> >Cheers,
> >
> >Luc Benard
> >