Re: [neonixie-l] USB connector shield

> On Feb 22, 2021, at 5:51 PM, newxito wrote: > > My pc also has a lot of cores and threads but only 100% CPU usage... I think > I should switch to Mac :-) Another reason: data rates are auto-ranging. They change magnitude so you don't have to figure out what The 2020 iMac goes up to

Re: [neonixie-l] USB connector shield

> On Feb 20, 2021, at 5:49 PM, newxito > wrote: > > I will put the board into a 3D printed case and that’s it. Since, > surprisingly, everything works as expected, there will be no revision 2... > but maybe an IN-13 version... I'd like to have a 4.5 digit version.

Re: [neonixie-l] USB connector shield

It’s nice to see nixies being used for something other than clocks! On Saturday, February 20, 2021 at 5:49:21 PM UTC-5 newxito wrote: > The little project is now working. It’s not the most exciting gadget of > the world but at least I learned something about USB connectivity. > When the PC

Re: [neonixie-l] USB connector shield

Very neat! Glad you got it all working. Jon. On Saturday, February 20, 2021 at 10:49:21 PM UTC newxito wrote: > The little project is now working. It’s not the most exciting gadget of > the world but at least I learned something about USB connectivity. > When the PC goes to sleep or is turned

Re: [neonixie-l] USB connector shield

So far it looks promising. I soldered the connector and the IC with the input protection components and then connected the board to the PC. The PC sees the device as COM port and I was able to reprogram the chip (FT_Prog utility) so that it negotiates 500mA. Jon schrieb am Mittwoch, 17.

Re: [neonixie-l] USB connector shield

You piqued my interest as to how the FT230X managed this point... From a quick read of the datasheet, it looks like that by default the chip tells the USB bus that it's in a bus-powered device that only needs 90mA. The datasheet is short of detail, but the implication is that you can change

Re: [neonixie-l] USB connector shield

Nice clock! In my circuit, the USB data lines are not connected to the MCU. Actually, I expect that the negotiation will be done by the FT230X (USB to basic UART IC), maybe I’m wrong. When plugged in, the device should only consume a few mA, I will delay powering on the nixies. For the HV, I

Re: [neonixie-l] USB connector shield

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,

Re: [neonixie-l] USB connector shield

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

Re: [neonixie-l] USB connector shield

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

Re: [neonixie-l] USB connector shield

Never underestimate firmware ;) On Mon, Feb 8, 2021 at 3:18 PM newxito wrote: > Thanks Paul, I added another 0805 for the cap and the PCB is now in > production. Time to start writing the software for the pc side, that > shouldn't be too hard. > >> > -- > You received this message because you

Re: [neonixie-l] USB connector shield

Thanks Paul, I added another 0805 for the cap and the PCB is now in production. Time to start writing the software for the pc side, that shouldn't be too hard. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group

Re: [neonixie-l] USB connector shield

The link in that stack exchange article is ok. Here is a current one. So my 100pF cap doesn’t agree with their 4700pF... https://www.cypress.com/file/88486/download On Monday, February 8, 2021 at 8:03:41 AM UTC-5 Paul Andrews wrote: > Here is a discussion. Looks like the cypress datasheet is

Re: [neonixie-l] USB connector shield

Here is a discussion. Looks like the cypress datasheet is probably the origin https://electronics.stackexchange.com/questions/4515/how-to-connect-usb-connector-shield On Monday, February 8, 2021 at 7:55:07 AM UTC-5 Paul Andrews wrote: > Some datasheet I read a long time ago had a 1M resistor

Re: [neonixie-l] USB connector shield

Some datasheet I read a long time ago had a 1M resistor in series with a 100pF capacitor between shield and signal ground. That is what I have used ever since as it was the first unequivocal statement on it that I had ever seen, before or since. See this schematic as an an example

Re: [neonixie-l] USB connector shield

That's a good point, but it I think it is ok because the connector I'm using is a 614105150721. According to the datasheet it should be a vertical micro-B USB connector M1 schrieb am Montag, 8. Februar 2021 um 02:26:57 UTC+1: > I don’t know, but thought I might point out that it appears you

Re: [neonixie-l] USB connector shield

The shield has a function of handling a static discharge when the plug is attached or the board is touched. A conductive ring around the edge of the PCB connected to the shield will prevent blowing out the electronics when that spark occurs. A resistor from shield to signal ground is reasonable.

Re: [neonixie-l] USB connector shield

If the USB device is powered thru the USB connector, you probably could get away with tying the shield to the circuit ground. But if the USB device has it's own supply, you definitely want resistance between the shield and circuit ground to prevent ground-loop currents, which cause noise

Re: [neonixie-l] USB connector shield

Not a lot of help but from the USB spec: 6.8 USB Grounding The shield must be terminated to the connector plug for completed assemblies. The shield and chassis are bonded together. The user selected grounding scheme for USB devices, and cables must be consistent with accepted industry practices

RE: [neonixie-l] USB connector shield

I don’t know, but thought I might point out that it appears you have the USB connector running in line along the circuit board. Maybe you meant to do that though. Michail Wilson 206-920-6312 From: neonixie-l@googlegroups.com On Behalf Of newxito Sent: Sunday, February 7, 2021 4:54 PM To: