You seem to have already taken care of the normal recommendations. So, first make sure the metal tube is grounded at the base. Second, make sure that it doesn't connect to the ground at the far end of the tube near the nixies - that way, you will avoid signal currents using the tube itself as a return path. Third, switching of the HV for the tubes is at confined at the top, so no emissions issues there. There is a slight risk that the switching to create the 170v will leak on to the supply rail, but given you are carrying that inside the tube, really you've done as much as you need to already. I remember when TV sets had tubes, huge voltages and currents switching, with little more than a hardboard cover.
On Monday, 5 October 2020 at 11:00:21 UTC+1 newxito wrote: > I’m a little bit concerned about generating a lot of EMI in this project. > I’ve added an image, so you can see what I’m trying to do. The controller > will be hidden in the base of this old lamp. I will need 5 wires going all > the way up into a horizontal tube. The nixies will be mounted with the > sockets on top of the horizontal tube. > The 5 wires are +170V, +5V, ground, SDA and SCL. > I’m concerned about the long 170V wire. Will this act as an antenna? > The wires will run inside metal tubes. Will this attenuate the EMI? > Should I twist all the wires together? Only SDA and SCL? > I was considering using a Cat6 cable and use one of the 4 twisted pairs > for the 170V, one for 5V, one for ground and one for SDA and SCL but I’m > not sure if that is a good idea. > Probably I should buy some kind of EMI meter and stop asking questions :-) > > -- 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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/554b64bf-e75e-4423-84fb-40c3c3eacb94n%40googlegroups.com.
