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BOM

Posted: Mon Jul 12, 2021 1:06 pm
by GadgetUK164
Does anyone have a BOM for the TF520? Caps I am not so worried about, its the resistors I need to know the resistance of.

EDIT: Worst case, I will just work out where they are an go with similar to TF530. I suspect they are just going to be pull ups etc.

Re: BOM

Posted: Mon Jul 12, 2021 1:37 pm
by GadgetUK164
Ah, it's OK - I see them on the schematics!

4K7 it looks like (for all)

All assembled and working OK =D Struggling to get any fast RAM working with it, but I am using a 25Mhz XTAL atm. Will drop to 20Mhz and see how I get on. The main thing is it works =D

If anyone else decides to build one of these, it uses the same schmitt trigger as the TF530. Caps - all SMD ones I went with 100nF. The two electrolytics - I just went with a 1uF and a 10uF (1uF nearest the CPU) - probably better having them the other way around. XTAL 7mm x 5mm 3.3v 20Mhz, and the usual 2.54 pin header and turn pin header etc. Nice simple board - doesn't take long to assemble!

Not very useful compared with at TF536 etc, but fun to build!

Re: BOM

Posted: Fri Nov 10, 2023 6:07 pm
by tOriman
Hi GadgetUK164,

Please read PM - I have a case for you (AtariST). Thanks.

regards
tOri