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   Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 06:48:16 JST Andrew Zonenberg

   Trigger crossbar board shipped before CNY fab shutdown! Hoping it gets out of China before all of the FedEx staff leave for vacation.

   Stencil is already here, parts should be coming in the next day or two and should arrive before the PCB.

   This will be a fun design to bring up.

   • Embed this notice
     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 06:48:11 JST Andrew Zonenberg

     in reply to

     • Rob Gilton

     @rgilton This was for five boards 165x121 mm, 10 layers ENIG with impedance control on 4 layers and filled ViP (full depth vias only, no microvias or blind/buried).

     Mixed Taiwan Union TU872SLK for signal layers and Shengyi S1000-2M between power planes and their respective grounds.

     James Morris likes this.
   • Embed this notice
     Rob Gilton (rgilton@fosstodon.org)'s status on Tuesday, 06-Feb-2024 06:48:14 JST Rob Gilton

     in reply to

     @azonenberg What are their prices like?

   • Embed this notice
     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 06:48:16 JST Andrew Zonenberg

     in reply to

     Got the QA report. I love this shop, they do this as standard not an extra-cost option.

   • Embed this notice
     James Morris (jmorris@social.kernel.org)'s status on Tuesday, 06-Feb-2024 06:50:06 JST James Morris

     in reply to

     • OSH Park
     • Rob Gilton
     @azonenberg @rgilton as a hobbyist, it's interesting to see concrete costs of professional level development. I just got 3 copies of a prototype board made by @oshpark for $8, including shipping.
   • Embed this notice
     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 06:52:57 JST Andrew Zonenberg

     in reply to

     • James Morris
     • OSH Park
     • Rob Gilton

     @jmorris @oshpark @rgilton This is actually "cheap". I was quoted something like $6.9K for an American fab to make a very similar specced board (but I think that one was only 8 layers not 10).

     But when you add in the additional $1K-ish of components I'm putting on the board, the custom rackmount chassis, another $1K or so of custom semi rigid cable from PCB to front panel, etc. this is going to end up being one of my most expensive projects to date.

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   • Embed this notice
     James Morris (jmorris@social.kernel.org)'s status on Tuesday, 06-Feb-2024 06:53:53 JST James Morris

     in reply to

     • OSH Park
     • Rob Gilton
     @azonenberg @oshpark @rgilton and this is why specialized technology is expensive, which I think many people don't understand
   • Embed this notice
     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 07:30:31 JST Andrew Zonenberg

     in reply to

     • James Morris
     • OSH Park
     • Rob Gilton

     @jmorris @oshpark @rgilton So we're at the point that I don't even blink at the cost of throwing a STM32L031 on there just to manage sequencing of the dozen-odd power rails and resets for everything.

     And the STM32H735 running the management interface is barely visible in the overall BOM cost either.

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   • Embed this notice
     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Tuesday, 06-Feb-2024 07:30:32 JST Andrew Zonenberg

     in reply to

     • James Morris
     • OSH Park
     • Rob Gilton

     @jmorris @oshpark @rgilton Yep.

     I mean, this is the FPGA I'm putting on the board. $249 @ qty 1. https://www.digikey.com/en/products/detail/amd/XC7K70T-2FBG484C/3641737

     It has 31 of these connectors https://www.digikey.com/en/products/detail/amphenol-rf/925-197J-51PT/10712133 on it. At the qty 25 price break that's another $175.

     The power supply is five of these https://www.digikey.com/en/products/detail/murata-power-solutions-inc/MYMGK00504ERSR/9748947 ($6.42 each) plus one beefier one for a higher current rail.

     I could go on and on, but it adds up.

     James Morris likes this.