Star-fst-l mailing list

["Valentino, Stephen" <svalentino AT bnl.gov>]

Hi Jianing,

Is this file named T-Board_v1.pdf the "final" schematic for the T-Board?

If yes, then I can use the signal names on it for the cable documentation.

Regards,
Steve Valentino
631-344-4644

-----Original Message-----
From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of ???
Sent: Monday, January 21, 2019 6:10 AM
To: star-fst-l AT lists.bnl.gov
Subject: Re: [Star-fst-l] Fwd: Update on T-board size & connector

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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