Star-fst-l mailing list

[董家宁 <jndong AT sdu.edu.cn>]

Hi Steve,
  Yes, the file named T-Board_v1.pdf is exactly the schematic we use now.
  Please let me know if it contradicts the cable design.

  Best regards,
  Jianing 


> -----原始邮件-----
> 发件人: "Valentino, Stephen" <svalentino AT bnl.gov>
> 发送时间: 2019-01-24 23:22:19 (星期四)
> 收件人: "董家宁" <jndong AT sdu.edu.cn>, "star-fst-l AT lists.bnl.gov" 
> <star-fst-l AT lists.bnl.gov>
> 抄送: 
> 主题: RE: [Star-fst-l] Fwd: Update on T-board size & connector
> 
> 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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