RE: differential probes

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

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Jimmy,

I have the 'stuff' here to find the "precise 0.177 caliber BB spacing" but 
ran out of time tonight :-(

I am thinking you should not order any boards till we can work some of 
these details out more.  Today, I talked to some folks that had some strong 
arguments for using cap in parallel with the resistors.  I fear that 
ordering boards now would mean that they would be "obsoleted" pretty 
quickly...  I don't know how much the boards cost, but I would not want you 
spending and serious money on something we know is going to change...

So, I think there are too many question to go getting boards right now.  We 
need to work more on this front end fusing and capacitance stuff.  I think 
I can get this stuff answered in a few days, so we would have a good chance 
that "that" version would be "the" version.

Cheers,

         Terry


At 08:41 PM 7/15/2003 -0700, you wrote:
>Hi,
>
>My stun gun used two staples for a spark gap. They
>formed an X shape, and could be adjusted by pushing on
>it. I would just need a way to calibrate it. If I used
>"BBs" or 0.25 inch balls, I could solder them in
>holes, and just look up the breakdown voltage for
>spheres.
>
>I'll cut the boards up wherever it looks like it needs
>it.
>
>
>--- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
> >
> > Hi Malcolm,
> >
> >
> > >I haven't downloaded the file as I don't have a
> > suitable program to
> > >open it with available on the NW. I do have a tip
> > to deal with the
> > >problem mentioned in the previous paragraph: the
> > way to increase the
> > >isolation barrier without consuming a lot of board
> > space is to
> > >physically cut a slot in the board across the
> > isolation barrier. This
> > >gets rid of the problem of surface tracking. I
> > presume fibreglass is
> > >the material of choice for this board? <paxolin or
> > anything like it
> > >is OUT>.
> > >
> > >Malcolm
> > ><snip>
> >
> >
> > That is a very good idea!  Tracking under these long
> > resistors could be a
> > big problem especially with a little left over flux.
> >
> > Jimmy - Could we drill 4 big holes under the
> > resistors?
> >
> > Also, I think hooking to the board with very thin
> > wire and then having
> > spark gaps on the board to take "bad" events is the
> > way to go.  Maybe
> > solder "BB's" or 1/4 inch balls to the board at some
> > spacing.  The spark
> > gaps could take a big high voltage high current hit
> > (arc at 2500V) and then
> > the thin wires could blow apart and basically take
> > things out of the
> > circuit.  I'll see if I can figure something simple
> > out there...
> >
> > Cheers,
> >
> >          Terry
> >
> >
> >
>
>
>=====
>Jimmy
>
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