This is the final board that i will order from JLCPCB. Hopefully it will work.
UPDATE 17/4/2026 –> Well it didn’t
After 10 days of rying to make it work, I gave up seems that old 74LS chips doesn’t do well with new HCTs and the SRAM. So i redesigned everything with new chips 74HCT,removed the RC analog delay and introduced a digital one passing the signals through many gates.
I ll salvage the 2 74HCT574 and the SRAM from these boards and order a new PCB with the new design.
All except the connectors and the 10μF catalytic capacitor will be assembled with a total cost including shipping of 150€ for 5 boards.
Gerber ,BOM and pick and place:
Good news! When the board will be fully tested, there will be a chance of buying one? Thks
Ok order set. Total cost with shipping is 150€ for 5 boards aseembled.