Thanks a lot for the information! There seems to be a lot of room for improvement for rev 2… The PCB should arrive this week, I will make some tests before connecting this thing to the pc.
SWISSNIXIE - Jonathan F. schrieb am Dienstag, 16. Februar 2021 um 23:30:28 UTC+1: > 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/da79d90f-cf95-43c9-9610-60817b2a1556n%40googlegroups.com.
