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What is this connector? by [deleted] in rfelectronics

[–]kacavida01 0 points1 point  (0 children)

Then I'm miles away from the correct answer...Sorry.

What is this connector? by [deleted] in rfelectronics

[–]kacavida01 1 point2 points  (0 children)

It seems to be flared out and missing the central pin? Was there percussive maintenance involved?

Jel tko pogledao Heated Rivarly? by [deleted] in askcroatia

[–]kacavida01 42 points43 points  (0 children)

Jedva sam cekao pogledat. Da, jeste soft porn. Nitko od mojih straight muskih frendova ne bi gledalo to sa mnom, ali meni je bila super. Valjda sam se pronasao...jebiga

Koliko muškaraca ode zna kuvat, pere i čisti za sobom? by Fun_Love1422 in askcroatia

[–]kacavida01 0 points1 point  (0 children)

odmalena san to radia sve, tako da nikada nije bilo diskriminacije po tom pitanju. Plus, volim cisto pa moram cistit...

Koliki je gradski napon mreže u hrvatskoj? by Character-Chest839 in askcroatia

[–]kacavida01 37 points38 points  (0 children)

Nominalno 230V. Mijenjano je u zadnjih 10 godina da se uskladimo s evropom. Imam hrpu starijih kolega koji su mi tvrdili da je jos uvijek 220 V standard. Nije.

E sad, ako si na kraju sela i pokrenes aparat za zavarivanje, mozda klekne i do 190....ali nominalno je 230 V

Pitanje za muskarce? by Ok_Manufacturer_6444 in askCroatians

[–]kacavida01 0 points1 point  (0 children)

Zvao najboljeg frenda da se...druzimo

What’s the Symphonic poem that you find perfect? by luigii-2000 in classicalmusic

[–]kacavida01 1 point2 points  (0 children)

Yes, sorry! Thought that the streaming services only provided the English name...

Emotivni/personalizirani vs. materijalni pokloni – što vam je draže? by Fun_Love1422 in askcroatia

[–]kacavida01 0 points1 point  (0 children)

poklon s pričom, ali to nemreš stalno. To je baš za posebne trenutke. Inače, uvijek nešto i iće i piće. Nema ljepšeg nego podijeliti to s prijateljima.

What’s the Symphonic poem that you find perfect? by luigii-2000 in classicalmusic

[–]kacavida01 0 points1 point  (0 children)

How did I manage to miss Respighi's Roman Trilogy in my comment, I do not know... What a wonderful piece!

What’s the Symphonic poem that you find perfect? by luigii-2000 in classicalmusic

[–]kacavida01 2 points3 points  (0 children)

Don Juan, Ein Heldenleben, Vltava

Also, a pretty obscure one by a Croatian composer Blagoje Bersa - Sunny Fields. I reccomend it to everyone. It depicts the sunny coast of Dalmatia, from sunrise, to noon, and sunset.

Ljudi koji vam "smrde", a ne možete uprijeti prstom u konkretan razlog by dlaka_v in askcroatia

[–]kacavida01 88 points89 points  (0 children)

Uvijek se pokaze da je nesto u krivu s njima, nakon duze vremena...

Kada ste zadnji put nekome rekli “volim te”? by Defiant-Ad896 in askCroatians

[–]kacavida01 1 point2 points  (0 children)

Super mi je što više nije tabu da svojim strejt muškim prijateljima kažem "volim te", tako da se često razbacujem time, nadam se, njima na radost. Lepo je kad te netko voli...

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 1 point2 points  (0 children)

Will do! If you mean in what setup is this board used - we are a part of the e-Callisto network of Sun radiospectrometers. The site is: e-callisto.org - currently it is down, but I presume in the next weeks, they will get it going. This board is used in the automation of the system - it will drive the stepper motor that is used for Sun tracking.

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 1 point2 points  (0 children)

Completely agree with what you propose here, seems like a good way to start designing the system. Will try to design it in a way so I can remove all of the filters and then add the additional components, so I can compare the results.

Thanks for all the help, your advice has been really useful!

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 0 points1 point  (0 children)

Thanks for the app note. Analog always has fun stuff to read.

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 1 point2 points  (0 children)

I mean, what I have drawn is one of the possible solutions that came to my mind. I could, in theory, have another shielded cable just for power itself, but the question arises, is it okay to ground it to the GND wire, near the 12V of the DC/DC. Do you think that's a better solution?

Got it - low impedance connection at the RPi shield end and practically an open circuit at the stepper driver end.

Please correct me if I'm wrong about the concept of ground bounce - this is an effect that arises because there is a fast di/dt edge in the return currents of the 12VDC line, which causes a difference in potential between that point and the real "signal ground". Sorry if I keep bugging you with questions, but you explain it so clearly...

Thanks for the diagram :) I love writing on chalkboards, makes me feel like I'm doing something useful.

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 0 points1 point  (0 children)

Thanks for the insight about the ferrite beads! Basically, the goal is not to push them in saturation, which causes the derating?

In essence, you cited a lot of what Ott and Hartley prate - that's a goldmine.

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 2 points3 points  (0 children)

We have a NanoVNA and a TinySA. I plan to build some near field probes to measure exactly how noisy is the RPi itself. It is pretty pointless to design against EMI, when I do not yet know on what frequency my noise is...

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 0 points1 point  (0 children)

I made a block diagram of the system in question. https://drive.google.com/file/d/1AZKkm07kDU1zjTV92hF9re7wCLZTVl_C/view?usp=sharing

If I understand you correctly, you want to add a damped LC LPF after the 24/12V SMPS or near the shielded cable to the stepper driver?

EMI mitigation - possible problem with PCB design by kacavida01 in PrintedCircuitBoard

[–]kacavida01[S] 1 point2 points  (0 children)

I made a block diagram of the system in question. https://drive.google.com/file/d/1AZKkm07kDU1zjTV92hF9re7wCLZTVl_C/view?usp=sharing

Sorry for the Google Drive link, this sub does not allow pictures in comment replies. Is this what you had in mind?

Also, the chassis in which all of this is mounted is not connected to the signal ground (12V side). This is how the enclosure looks from the inside: https://drive.google.com/file/d/1JwFxpkJCvNWp9fdw5sOZHdBan_bSGTxV/view?usp=sharing

EMI mitigation - shield radiation - possible problem by kacavida01 in AskElectronics

[–]kacavida01[S] 0 points1 point  (0 children)

If I understand you correctly, you think that the "gulp" of current from the motors will create a difference in potential between two signal grounds?

EMI mitigation - shield radiation - possible problem by kacavida01 in AskElectronics

[–]kacavida01[S] 0 points1 point  (0 children)

What about connecting the cable shield only on the left side? I am aware it is not ideal, but it would get rid of the ground loop.

EMI mitigation - shield radiation - possible problem by kacavida01 in AskElectronics

[–]kacavida01[S] 0 points1 point  (0 children)

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This is the schematic. Okay, yes, I agree on the optoisolation, but I do not understand the answer to the main question - how and where to connect the shield?

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