Recreation of the Acorn Plus 1 based off of original schematic and redrawn schematic
Goal was to recreate as much as possible the schematic and design of the original PCB and to use descrit components.
Issues sourcing components as some are no longer made. Cost to make is >£100, PCB's £11 each PCBway used to make boards
Missed a hole off on lower left for mounting PCB to Case. Note :- Version 1.1/1.1.1 not made into PCB's yet as of 26/06/23
Issues fixed listed below found in V1 and other issues on Stardot
Using original schematic from Acorn and redrawn schematic by P.Harvey
Points to note, redrawn schematic has -5V going to Analogue port should be +5V
Pin 2 of IC6 needs connecting to Pin 3 of IC8.
Also used the excellent work of myelin and his KiCad files for the connectors
https://github.com/myelin/myelin-kicad.pretty
IC6 needs moving 1.2mm up so AP6 board will fit.
Two holes missing one mounting hole and one hole by lower edge connector.
Resistor size chosen a bit small just fits.
Left analogue hole needs to be moved 2mm as doesnt align with lower case.
IC8 Ground connection on back needs increasing 1mm.
Recheck layout and tidy up visual issues.