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Contents
Notice....................................................................................................................................................................................1
Building it .............................................................................................................................................................................2
Preparing .......................................................................................................................................................................2
Step 1: USB Power In and MCU part ...........................................................................................................................2
Step 2: RTC part............................................................................................................................................................4
Step 3: Filament Driver part..........................................................................................................................................5
Step 4: Negative High Voltage part circuit....................................................................................................................6
Step 5: CDS and IR part................................................................................................................................................7
Step 6: VFD drive Chip.................................................................................................................................................8
Step 7: First Testing ......................................................................................................................................................9
Step 8: Cleaning Circuit Board ...................................................................................................................................10
Step 9: Buzzer part ......................................................................................................................................................11
Step 10: Buttons part...................................................................................................................................................12
Step 11: Test the buttons, buzzer, and VFD panel.......................................................................................................12
Step 12: Solder the VFD48 Panel ...............................................................................................................................13
Step 12: Solder the Extras:..........................................................................................................................................13
Circuit and PCB ..................................................................................................................................................................16
