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MEGA65 / megaphone-r4-pcb

MEGAphone PCB redesign under NLnet Foundation grant
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Chipaggedon is making sourcing some components difficult #42

Open gardners opened 2 years ago

gardners commented 2 years ago

This issue is to track the parts shortage induced changes / solutions. Items not listed below are in-stock at digikey at the time of writing.

goran-mahovlic commented 2 years ago

I have check and all replacements are fine, and they do not require PCB changes...

gardners commented 2 years ago

TLDR;

  1. Orders will be placed with: a. digikey b. mouser c. win-source.net d. chip1source.net
  2. I have several of the other parts on hand, and will arrange shipment of them to you.
  3. There are two parts left for me to source, as listed below.
  4. I will forward you copies of the orders once they are submitted. I am ordering enough parts for us to build 4 units, instead of 2.
  5. Please check all of the part allocations in case I have missed anything.

Problematic parts/Parts to give special attention to:

Row 55 - Thumbwheels Row 63 - 4G modem connectors. I see you have the MM60-52B1-E1-R650 connectors, but I don't see the part for the latch end. Is it there? It is necessary, or else the modems won't hold in place. I am also having great difficulty sourcing these at the moment.

Trying to place the order now, with the following further substitutions required. Please double-check the substitutions:

Row 22 - SZMM3Z24VT1GX from Mouser Row 79 - possible footprint/package change - https://au.mouser.com/ProductDetail/NXP-Semiconductors/PCF8563TS-4118?qs=LOCUfHb8d9ugg%2FdJSyv6Ig%3D%3D Row 83 - https://au.mouser.com/ProductDetail/ABRACON/ABS05-32.768kHz-7-T?qs=XAiT9M5g4x%252BdZqLQfRhFYw%3D%3D

Parts on hand with me here that I am including in a separate package for you:

Row 22 - MM3Z24 zener diode x 1 Row 55 - 10mm 50K POT thumbwheel x 1 so that you can confirm fit and function, the case I can't source more immediately. Row 60 - Gameboy D-PADs x 8 kits Row 61 - Gameboy buttons x 8 kits (If we still have 4 buttons, you will need to ransack 2 kits to make each single kit) Row 63 - 4G Modem PCI Exp Mini Female connector Row 63a - Card latch MM60-EZH0390B5-R850 x 1 and lower profile ones that might be too low x4

Parts being purchased from other suppliers:

Row 15 - (100nF) https://au.mouser.com/ProductDetail/603-CX805MRX7R7BB104 Row 15a - (39pF) https://au.mouser.com/ProductDetail/Kyocera-AVX/08055U390JAT2A?qs=sGAEpiMZZMsh%252B1woXyUXj6je3081f8Nb1a9Zh08m%252Br4%3D Row 17 - https://au.mouser.com/ProductDetail/80-FCS0H473ZFTBR24 Row 27 - https://www.chip1stop.com/AUS/en/view/searchResUpt/InventryInfo?unqPartId=MOLE*0246897&unqPartNm=104168-1616&keyword=104168-1616&partId=MOLE-0345869, MOQ = 200, but oh well Row 68 - https://www.win-source.net/texas-instruments-lm74610qdgkrq1.html Row 73 - https://www.win-source.net/texas-instruments-sn74lvc245apwt.html Row 74 - https://www.win-source.net/interface-specialized-tpd12s016pwr.html reel of 35 Row 76 - https://www.win-source.net/fairchildon-semiconductor-fan5333bsx.html x 4 Row 77 - https://www.win-source.net/texas-instruments-tps63021dsjt.html Row 78 - https://www.win-source.net/accelerometers-lis3dh.html Row 79 - https://au.mouser.com/ProductDetail/NXP-Semiconductors/PCF8563TS-4118?qs=LOCUfHb8d9ugg%2FdJSyv6Ig%3D%3D
Row 80 - https://au.mouser.com/ProductDetail/Hirose-Connector/FH12A-40S-0.5SH55?qs=Ux3WWAnHpjANOPB31cr%2FJw%3D%3D x 4 Row 81 - https://www.win-source.net/pmic-voltage-regulators-dcdc-switching-regulators-tps63020dsjt.html x 8 Row 83 - https://au.mouser.com/ProductDetail/ABRACON/ABS05-32.768kHz-7-T?qs=XAiT9M5g4x%252BdZqLQfRhFYw%3D%3D

Rows added after the spreadsheet was provided:

Row 84 - 50pin 2x25 0.1" female header - digikey Row 25 - 1Gbit SPI flash - digikey

gardners commented 2 years ago

Digikey and Mouser orders are in:

20220409-Mouser_Order_25121893.pdf 75264465.xlsx

Working on the rest now.

They are all shipping to me first, and I will forward as one big tracked parcel to you once they arrive.

gardners commented 2 years ago

And the other two orders have been placed:

20220409-win-source_order_258673.pdf

The Chip1Stop one has only the SIM/microSD connectors, so no PDF summary of that one.

gardners commented 2 years ago

For the two remaining parts...

For the thumbwheels, these look feasible:

https://www.digikey.com.au/en/products/detail/bourns-inc/3352T-1-503LF/1088352

Please let me know if you think they will be ok.

The 4G modem bay connectors will then be the last thing left unsolved.

gardners commented 2 years ago

For the 4G modem bays, I think these should be ok. Please check:

https://www.farnell.com/datasheets/2645681.pdf

We would use ones that are quite high, to leave as much clearance as you need under the modem module when inserted. For example, we can use the 7mm PCB centre-line clearance.

The tricky bit is that I can't see exact matching latches of the correct height. One solution is to put matching hole-throughs in the PCB, so that we can just put bushes and use screws to hold the modules in place once inserted.