First of all, grounding - or - how to connect the shield, is not really specified, and usually you should consider the chip's datasheet / application notes on how to do it.
For example, see the TUSB4020BI <https://www.ti.com/lit/ds/symlink/tusb4020bi.pdf?ts=1613514246737&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTUSB4020BI>Datasheet, page 27/28. But surely this is for series production and professional product, if used as hobbyist project, i would just connect the shield to ground. A few more notes on USB: I would move away the usb connector as far as possible from the HV supply. I guess U3 is the MCU, so place near there. Also make sure you put TVS diodes on the Data lines, to protect them from ESD damage, and differential routing maybe should be used here too. If you don't have a pcb tool that can do this, try at leas to have the usb datalines in the same distance and trackwith and route them as parallel as possible. Maybe also try and measure power first, i've had some issues with running a nixie circuit off a *Standart USB Computer Port* since those are usually limited to 500mA. Newer computers have electronic fuses / controllers, and i've had the issue that at the start, the psu spiked to over 500mA, and the Computer turned the USB off. USB3 ports usually have 1000mA On Monday, 8 February 2021 at 21:58:02 UTC+1 newxito wrote: > The PC should see the board as a COMx connected over USB, so the software > (C#/.NET) just has to send some WMI data (CPU load %, Disk usage %, …) to > the serial interface… sounds easy :-) > The software should be a service, so the data can be sent even when nobody > is logged in. > And I would like to shutdown the high voltage if the pc goes to sleep or > turns off. > Probably I will end up killing my pc mainboard :-) > > Kevin A. schrieb am Montag, 8. Februar 2021 um 21:21:00 UTC+1: > >> Never underestimate firmware ;) >> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/06fe018f-594e-49c3-8544-c70d431262ban%40googlegroups.com.
