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[Gerard Visser <gvisser AT indiana.edu>]

p.s. And pin 39, I just noticed.

On 1/18/2019 8:06 AM, Gerard Visser wrote:
> Hi Jianing,
>      I don't see any advantage to 2 layer vs. 4 or 6 layers even if it helps 
> make a smaller board. The mechanical situation is probably greatly improved by 
> the smallest possible T-board, at least in the radial direction. (Also of 
> course, it doesn't have to be a simple rectangle shape, if that helps. No sure.) 
> The total mass of copper should still be kept to minimum of course.
>      The cost of the T board must surely be insignificant compared to the other 
> parts, even if it was a "complicated" PCB.
>      Do you have schematics for your "hybrids" i.e. the APV carrier flex 
> circuits yet? The T board schematic I think looks almost correct to me but I'd 
> like to look at both together if possible. It seems like there is a mismatch 
> between your pin 27 usage on P1 vs. P2 - is that intentional? I'd have expected 
> you'd want them identical.
>
>      Gerard
>
> On 1/18/2019 4:04 AM, 董家宁 wrote:
> > hi Gerard,
> >    Thanks for the comments.
> >    Please find the schematic for T-board in the attachment.
> >    It's hard to route all the lines in 2 layer board. I'll try my best to keep 
> > the current size.
> >    If it is too large for the mechanics, I'll add two extra layers to decrease 
> > the board size.
> >    I also think mounting holes are needed. If the holes are too large, the 
> > length may be increased.
> >
> >    Best regards,
> >    Jianing
> >
> >
> > > -----原始邮件-----
> > > 发件人: "Gerard Visser" <gvisser AT indiana.edu>
> > > 发送时间: 2019-01-17 22:49:51 (星期四)
> > > 收件人: star-fst-l AT lists.bnl.gov
> > > 抄送:
> > > 主题: Re: [Star-fst-l] Fwd: Update on T-board size & connector
> > >
> > > hi Li,
> > >     Sorry I couldn't make the meeting this week. Perhaps next one.
> > >     Can you guys send the schematics for your T-board and hybrids please? 
> > > It's hard
> > > to comment much looking only at T-board layout...
> > >     Silkscreen isn't crucial, I have left off refdes markings for some 
> > > components
> > > on dense board designs, it's ok.
> > >     If 6x3 cm is too large for the mechanics, I think you could make this 
> > > layout in
> > > 6x2.4 cm or so, judging from the layout picture. But if course if 3 cm is
> > > already good that is quite fine.
> > >     I think 4 layer board would also be fine. (With about same total amount of
> > > copper of course, don't add mass if you do that.
> > >     Anyway, looks like a good start.
> > >     It needs some mounting holes, maybe? Or did you plan to epoxy it to the 
> > > frame?
> > >     Sincerely,
> > >
> > >         Gerard
> > >
> > >
> > > On 1/17/2019 9:37 AM, LI YI wrote:
> > > > Dear All,
> > > >
> > > > Please find update on T-board at
> > > > https://drupal.star.bnl.gov/STAR/system/files/T-board_update_JND_190117_0.pdf
> > > >
> > > > The preliminary size is 6cm x 3cm. It is not finished yet and we will
> > > > try hard to fit the rest into current size. There are current two
> > > > layers. We may need extra layer if the rest cannot be fit in. Would
> > > > extra layer be acceptable?
> > > >
> > > > The only choice we have for connectors in the same series is 25x2 pins
> > > > (IST one is 30x2 pins). The new type will save us 4mm in length.
> > > > Considering the possibility of increasing risk with little gain, we
> > > > would prefer to keep the same type as IST connector.
> > > >
> > > > Regards,
> > > > Li YI
> > > >
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