danboid wrote: ↑
Wed Jul 15, 2020 11:01 pm
It is very expensive for me to buy anything from DigiKey and Mouser here in the UK. Even the smallest, lightest component incurs £14 postage so I would prefer if I could've bought everything from RS or Farnell. It would be good to see someone iterate on this BOM to see if they can buy everything from Mouser maybe except for the SNES connectors and controllers, as you say. It was easiest for me to buy most of the components from DigiKey because those are the parts referenced in the official UB BOM. There was less chance of me buying wrong parts as happened with the power jack.
True, didn't quite pay attention to the postage, since I rather approached it thinking what I might need for various tinkering, so I ended up with stuff out of which I could build two Uzeboxes in addition to what I already have. The BOMs could be tricky, you assemble it today, but a year from now, those part might just not be there any more, or cost / minimal order becoming prohibitive. So I rather took the approach to see what each of them does, and picking whatever fits. Like with resistors, for the display, let's see what gives me the proper output, and I can find in 1% tolerance in adequate quantities. 750 ohm, 1.5Kohm and 3Kohm with 75 ohm to ground, still giving the right levels for Scart. Voltage dividers for SD the same, the important point is to get something reasonably about 3.3V into the card. The 10K used for pull-up could be about anything reasonably large. Then a modest pile of 100nF caps as you just need them for every IC, same for 22pF caps, carefully selecting crystals which need that at the frequencies I was interested in (18MHz in particular for my experiments in addition to a few 28.6MHz ones if I wanted to build a Uzebox).
So got quite a pile of parts in one order from Mouser in the end (in the UK), then most of the rest I picked up from Amazon whenever I needed something anyway, so adding a pack of resistors or leds to an order you make (for example some books in my case) can get those missing components at a fair price with no extra shipping cost.
Now you should mostly have your parts though, so I guess only the Amazon idea might apply if you shop there on occasions.