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Sorry to jump in. This thread has been bringing back lots of memories of messing around with logic chips over 40 years ago. I've forgotten most of it now but it was fun at the time. My first design was a keypad operated car imobiliser for my Astra GTE.
Did you know there are companies in China such as JLCPCB that will produce PCBs for next to nothing if you can supply a Gerber design file. That would make your life so much easier. For example, 20off 100 x 50mm single sided boards are £9.52 plus delivery. Uk delivery is from £5.60. I know it takes away the fun(!) but it would make your life a lot easier.
Did you know there are companies in China such as JLCPCB that will produce PCBs for next to nothing if you can supply a Gerber design file. That would make your life so much easier. For example, 20off 100 x 50mm single sided boards are £9.52 plus delivery. Uk delivery is from £5.60. I know it takes away the fun(!) but it would make your life a lot easier.