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[董家宁 <jndong AT sdu.edu.cn>]

Hi Gerard,
  Thanks for the comments.
  I'll try 4 layers to make the T-board smaller. Surely, the geometrical 
shape can be optimized if needed. 
  The mismatch between the two connectors has been there in the original IST 
design, and I also don't know why. But currently, I have modified the 
connection to make it consistently in the updated version. Please refer to 
the attachments to find the schematics for hybrids and T-board.
  Thanks.
  
  Best regards,
  Jianing     


> -----原始邮件-----
> 发件人: "Gerard Visser" <gvisser AT indiana.edu>
> 发送时间: 2019-01-19 01:11:59 (星期六)
> 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
> 
> 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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> >>>>
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