RE: differential probes

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

Original poster: "jimmy hynes by way of Terry Fritz <teslalist-at-qwest-dot-net>" <chunkyboy86-at-yahoo-dot-com>

Hi,

I used expresspcb for the layout. There are some pictures of it here: 
<http://www.hotstreamer-dot-com/chunkyboy86/diffprb.jpg>www.hotstreamer-dot-com/chunkyboy86/diffprb.jpg
www.hotstreamer-dot-com/chunkyboy86/diffprb2.jpg

You can also download the software, and change the layout yourself.
<http://www.hotstreamer-dot-com/chunkyboy86/diffprb.pcb>www.hotstreamer-dot-com/chunkyboy86/diffprb.pcb 


I haven't fixed any of the problems Terry pointed out yet. I am waiting for 
the new design.
--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: "Malcolm Watts by way of Terry
 > Fritz <teslalist-at-qwest-dot-net>"
 > <m.j.watts-at-massey.ac.nz>
 >
 > Hi Guys,
 > I'd like to have a look at that layout.
 > Is the layout
 > program Protel or Easytrax by any chance?
 >
 > Malcolm
 >
 > On 15 Jul 2003, at 21:54, Tesla list wrote:
 >
 > > 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
 > f! olks 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
&g!
t; > > > 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
 > > >
 > >
 >
 >


Jimmy


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