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@@ -27,7 +27,7 @@ And I will upload kiCad files after I know revision 1.6 is working well, which c
I noticed that somehow I hadn't uploaded a correct BOM, so I added the Bill of material file in the form of and .ODS (open officie spreadsheet) file
The BOM contains exact component designators for all components used from either farnell or mouser, so you will know EXACTLY which components to buy.
Note that R21 (the series resistor for a keyboard LED )is NOT in this BOM, as I added it after I created the BOM, but should be 330 Ohm (if you add a keyboard LED) That is if you built the keyboard I designed for the ZX81plus35 that also works with this ZX81plus38, in the schamatic a value of 100Ohm is used, which is also okay, although much brighter.
Note that R21 (the series resistor for a power LED) is NOT in this BOM, as I added it after I created the BOM, but should be 330 Ohm (if you add a Power LED) That is if you built the keyboard I designed for the ZX81plus35 that also works with this ZX81plus38, in the schematic a value of 100Ohm is used, which is also okay, although much brighter.
on june 15, 2022 I uploaded a BOM for revision 1.7 of the ZX81+38 creating some corrections R20 should be 680R, R21 should be 330 R R29 should be 1M RP22 can be 10Kx8 but 22Kx8 works better with some keyboards, C7 should be 47nF, most importantly U21 should be a 74HC04 or 74HCU04 NOT A 74HC14!