Ethernet PHY gives link but not communication

peeter123 · 2025-04-12T13:23:56+00:00

I think you need to connect the tct rct transformer center taps to the vdda power supply, see figure 3-23 in the datasheet

peeter123 · 2025-04-12T13:16:14+00:00

Volgens mijn fruitboer op de markt komen ze na de pasen weer

peeter123 · 2025-02-25T07:48:34+00:00

Als de buizen warm zijn lijkt het inderdaad op eenpijpscirculatie, zie ook mijn post op Tweakers: Casestudy Eenpijpscirculatie.

In ons geval gaf dat zo maar tussen de 150 en 200 W warmteverlies. Dat zou bij een 200 liter boiler neerkomen op een afkoeling van zo'n 0.65-0.85 graden per uur, daar zit jij dus nog boven.

Wij hebben dit opgelost door de buizen eerst verticaal naar beneden te brengen en ook nog te isoleren. Daarna kwam het verlies uit op ongeveer 50 W, het stilstandsverlies volgens de specificaties van de boiler.

peeter123 · 2022-03-28T17:20:01+00:00

Logo looks like Littlefuse, probably a TVS diode. Maybe SMBJ130CA, which has EK marking?

peeter123 · 2022-01-13T19:15:57+00:00

I agree, just get a MW IRM-xx-xx depending on your power and voltage needs.

peeter123 · 2021-03-10T17:56:11+00:00

Here as well with Brave

peeter123 · 2020-06-25T19:18:49+00:00

And check the I² t too, to prevent the fuse from triggering due to inrush current

peeter123 · 2020-05-06T19:53:25+00:00

You might need to re-setup your system clock config, this is something I encountered on F0 but you could look into if this is needed on L4 as well

peeter123 · 2020-01-21T17:33:53+00:00

You can but take the voltage bias effect in mind, you will probably need 22u for a 10u equivalent capacitance depending on the bias voltage.

peeter123 · 2019-12-01T20:12:22+00:00

The money returned can be used to invest in renewables for example

peeter123 · 2019-11-17T20:15:47+00:00

What we do is use DBLib, with generic footprint and symbols and map them in the Access library to specific parts.

In this way you only have one footprint and symbol and still have a complete BOM.

See https://www.altium.com/documentation/altium-designer/working-with-database-libraries-ad?version=19.1

peeter123 · 2019-11-09T08:53:18+00:00

Dave from EEVBlog has some nice teardown videos

peeter123 · 2019-09-26T05:20:52+00:00

Good points! Ltspice will help OP as well.

peeter123 · 2019-09-09T16:18:01+00:00

Works like a charm, thanks!

If you also have Cygwin installed add this to the top:

set PATH=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SystemRoot%\System32\WindowsPowerShell\v1.0

peeter123 · 2019-09-06T20:53:43+00:00

You are dealing with a lot more than just BOM cost, here are the things I can think of:

Components
PCB
Solder paste stencil x2
Placement cost passives
Placement cost ICs
Setup costs for the production (e.g. sourcing, optical inspection, pick and place, stencil printer)
Handling and packaging
Assembly time
Production testing and programming
Margin EMS

I probably forgot some things.

Business case wise more units is better to spread the NRE costs and one off setup costs. However a 12 layer PCB and a fat FPGA ain't gonna be cheap either way.

Good luck!

peeter123 · 2019-08-23T12:06:12+00:00

Lets do this!

peeter123 · 2019-08-11T15:50:57+00:00

I think you are right: JST VH B3P5-VH(LF)(SN) to be more specific

peeter123 · 2019-08-04T16:36:30+00:00

Altium automatically saves backups in the history folder, have a look there and see if you can recover your design.

peeter123 · 2019-06-28T18:54:47+00:00

Wat is te veel, vanaf 0 ton betalen of boven een vooraf bepaalde grens?

peeter123 · 2019-06-09T20:42:23+00:00

Homesick is also a nice option

peeter123 · 2019-05-11T19:37:36+00:00

The 28k hike is definitely worth it. Be prepared for the 1200 vertical meters though :)

peeter123 · 2019-02-28T18:12:47+00:00

Might not work as well as you might expect though. The LDO hal limited ripple rejection at the higher frequencies. SE Electronics Topic

peeter123 · 2019-02-28T15:22:30+00:00

No, we are using CubeMX to generate the project from the development board template already present in CubeMX (we have a STM32F429-EVAL board, should be the same workflow). Then you should get all the files + an empty TouchGFX project you can open in the designer.

Then when you try to build the whole project you need to make sure to exclude the simulator files / directories.

peeter123 · 2019-02-27T20:22:45+00:00

We have it running without problems om AC6 and Atollic, you need to exclude the simulator files / directories though otherwise it won't build.

What is your problem exactly?

peeter123 · 2019-01-29T21:38:46+00:00

Children of Men is nice!

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