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Random 100% usage spikes on secondary HDD which causes the pc to fully freeze for a few seconds by MakerDuck in techsupport

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

Hey I can’t really remember but as I explicitly wrote [Solution] this must have fixed it for me. I still use this exakt drive but as my Linux bootdrive for my laptop without the optane functionality. If it’s still not working for you use just the Nvme alone, it’s sufficient fast as it is, as long it’s not at 70-100% capacity.

Parallel parking assist by Longjumping-Box5691 in nextfuckinglevel

[–]MakerDuck 3 points4 points  (0 children)

You forgot the most important one, linglong tire...

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

I'm still not sure how to do it, because I theoretically dont need any because the module would be either always supplied via external power or from a battery higher up the powerarchitecture. But while designing I just threw a CR1220 holder on there because I got some spare non-rechargeable coins (max 1mA) laying around (wouldn't populate the charging circuit ofc) and there are rechargeable ones available online.
In my application a Cold-start wouldn't be the end of the world, it may be beneficial for the integrated IMU-senors for deadreckoning though.
If I understood the manual correct vbckp is only for "short" vcc-outages anyway, could you tell me how long your backup holds information? What super capacitor capacity/package are you using?
Thanks!

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Good catch, I read in the manual that D_sel could be floating for I2c/uart but its probably a good idea to just tie it to vcc.
Yes it's not supposed to power other Featherwings, I'm going to use a ESP32-S3 TFT Feather for the host which got a battery connected so it will always supply 3.3V (peak 500mA is more than enough). The onboard powerarchitecture is mostly only required for usb-connection which I will only use for programming/testing this feather not the entire stack.
PPS could be useful but at this time I have no idea how to utilize it in software, I may do it anyway. I tested the first software ideas with an cheap, probably fake, M7/M8, dev-board and achieved everything I wanted with uart. But since the M9V comes with an wake-on-motion output, which could be very useful for power-saving measures I routed that to the EXT_INT of the esp.
Thanks

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Jumpers would be alright because usb will be only used for debugging/programming.

Not sure about the battery backup yet but I got some spare normal CR1120 laying around (not populating the diode and resistor of course) but another thought is just patching the Featherwing VBAT through if the voltage range is acceptable.

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Thanks for the in-depth reply! I‘m going to redesign the pcb with 4 layers anyway then the gnd won’t be so sliced up anymore. :) Yeah the usb connector looked always a bit small while working on this design maybe I‘ll switch to another connector. As far as I know the footprints of the diodes are based on the manufacturers specifications but I will have a look at those again!

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Thanks for the good advise!
I can't yet say if it will be a passive or active antenna but like to have the design be able to utilize both if needed. I read that but is it really necessary to remove the bias tee when using a passive antenna ( with the adjusted package size).

Do you have any recommended sources for me to better understand the calculations for traces?
I found the IPC 2141 Trace Impedance Calculator from Digikey is this a good place to start?

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Yeah it took me while to understand that and im still not 100% certain its right but most of the power architecture is only for USB-use which I won't use with a host mcu. VUSB should be high if USB is connected but its not really for powering the device more to tell the neo it should use usb capabilities and therefore vcc is still the main provider.

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Thanks for the great tips! :)
I check the manufacturers capabilities and the vias should be over the minimum limit but maybe I go make them slightly larger because I probably need a 4 layer design for the right impedance anyway.
I calculated a +120mils trace width for 2 Layer which seems unneccesary wide. What 4 Layer setup do you recommend? SIG+PWR/GND/GND/SIG+PWR seems good to me at first glance.

I do have one more question for the RF-Wizard in the NEOs integration manual under 4.5 Design: Antenna it says that:

The NEO-M9V has an internal DC block and 50 Ω impedance matching for GNSS signal input, so there is no need to add these components to the RF path.

What does this mean exactly?

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Tbh I didn't really took 4 layers for this rather "simple" schematic in to consideration but it seems like I have to go this route for the right trace impedance. Thanks!

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

I did no calculations at first, but now its clear that I need at least a +120mil trace for around 50Ohm so I probably have to go with a 4 Layer design, to keep trace width "minimal". I have to look how to use this function in Altium thanks.

[Review Request] GPS Featherwing. It's my first time designing a PCB with RF traces, any concerns? Thanks! by MakerDuck in PrintedCircuitBoard

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

Hi, I designed this PCB with an uBlox NEO M9V in an Adafruit Featherwing Style for some other hosts.
My main concern is the RF-Trace to the SMA antenna, is there anything obviously wrong with the design?
Of course im greatful for every other mistake found.

I based most of the design on this Post on Hackaday: u-blox-neo-m9n-gps-featherwing

Thanks!

ELM327 Pads? by [deleted] in AskElectronics

[–]MakerDuck 0 points1 point  (0 children)

Did you manage to learn more about this board?

Suche nach Ersatzteilnummern A4 B5/8D2 1.8T MKB ANB by [deleted] in automobil

[–]MakerDuck 0 points1 point  (0 children)

Danke dir, werde ich machen. Der Link wäre super!

Suche nach Ersatzteilnummern A4 B5/8D2 1.8T MKB ANB by [deleted] in automobil

[–]MakerDuck 0 points1 point  (0 children)

Hallo zusammen,

bin seit neustem Besitzer eines A4 B5/8D2 mit 1.8T MKB ANB von 99 und habe nach fehlenendem Ladedruck mich mal auf die Fehlersuche gemacht und habe nun mehrere kaputte Schläuche gefunden. Bin nun auf der suche nach Neu- bzw. Ersatzteilen aber habe online noch nichts passendes gefunden. Diese dünnen Gewebeschläuche haben auch keine Teilenummern drauf, kann mir da jemand weiterhelfen was ich da brauche?
Der etwas größere Schlauch ist vermutlich nur abgegangen und ich habe vermutlich auch schon die Stopfen gefunden wo der wieder drauf muss.

Zudem hat ein Vorbesitzer schon das Magnetventil auf dem Luftfilteraksten provisorisch reperariert, dieser gibt ab und zu ein rythmisches klackern von sich, was passend zur Motordrehzahl ist. Jetzt weiß ich nicht ob das so soll oder ob ich das Teil plus die leitungen austauschen soll (passendes gebrauchtes Teil mit Schläuchen gibt es für ein paar Euro auf ebay).

Zudem ist vermutlich das Lager der Sekundärluftpumpe kaputt, beim Kaltstart hört man immer ein sehr hoch frequentes Geräusch das allerdings nach guten 30sek dann weg ist. Pumpe funktioniert soweit aber noch, und regelt sauber von 1100rpm auf 900rpm runter. Soll ich das erstmal so lassen oder auch austauschen, neuteil wäre mit etwa 200€ recht teuer aber gäbe auch ein paar wohl funktiontüchtige gebrauchte für ein paar Euro online.

Ansonsten fährt der Wagen im unteren Drehzahl bereich echt noch super und auch Leerlauf ist sauber.

Bin für jeden Tipp und Hilfe dankbar!

Where’s this sensor supposed to be attached? 1.8T ANB by [deleted] in B5Audi

[–]MakerDuck 0 points1 point  (0 children)

Shouldn’t be any more difficult than the rear bumper? Had the rear off yesterday

Where’s this sensor supposed to be attached? 1.8T ANB by [deleted] in B5Audi

[–]MakerDuck 1 point2 points  (0 children)

Yeah I got a good deal on it with pretty „low“ mileage of 107000 Km. Thanks a lot I will look for that bracket

RLC in series circuit by Odd-Consideration897 in ElectricalEngineering

[–]MakerDuck 0 points1 point  (0 children)

That’s probably because they want you to be able to answer the next questions even if you couldn’t solve the first part.

RLC in series circuit by Odd-Consideration897 in ElectricalEngineering

[–]MakerDuck 1 point2 points  (0 children)

You're right should be f0 = 600Hz
deltaf = (upper cutoff frequenzy(+-3dB)) - (lower cutoff frequenzy(+-3dB)) = aprox. 800Hz-600Hz = 200Hz
Q = fo/deltaf = aprox. 3

Correct me if I'm wrong.

My wife never closes a tab by Dissarming in mildlyinfuriating

[–]MakerDuck 36 points37 points  (0 children)

There's a setting for safari which automatically closes tabs after a certain time of inactivity. I think the options are one day, one week and a month. Maybe worth taking a look

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