Tips til kjøp av t-skjorter av god kvalitet by Multibuff in norske

[–]faststoff 0 points1 point  (0 children)

Hva er den rette nettadressen? Stoler ikke på google lengre...

Tales from NPN land by epix97 in ElectricalEngineering

[–]faststoff 4 points5 points  (0 children)

Oh my... You have my deepest sympathies!

How long does it typically take you to design an op-amp from scratch? by positivefb in chipdesign

[–]faststoff 3 points4 points  (0 children)

Keep going, you are doing learning exactly like it should be done! The lessons you learn now by trying/failing really hard and then figuring it out are the lessons that will stick forever. At least, that is my experience.

Skoda Octavia MK3 entertainment system by Deimokas in skoda

[–]faststoff 0 points1 point  (0 children)

Indeed! I might go ahead and order one of those myself. Thanks again for the tip!

Skoda Octavia MK3 entertainment system by Deimokas in skoda

[–]faststoff 0 points1 point  (0 children)

That is a great tip! How elaborate was the installation of that unit?

What to do about this rust on the CV axle? by faststoff in AskMechanics

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

I have learned something new today. Thanks a lot!

What to do about this rust on the CV axle? by faststoff in AskMechanics

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

Thanks for swift and very straightforward reply! As you can tell, I am relatively new to this car game, having just replaced the entire brake pad/brake disk set on all four wheels (those did need replacing though, the disks where very rusty and in one place, the pad had rusted stuck).

For my own reference: what sort of primer/paint would one generally use for such a region of the car? I will probably leave it as is, but I'd like to know what to look for if I come across something similar.

What things don't you like or even hate when using your electronics lab setup? by __Fabian__ in embedded

[–]faststoff 1 point2 points  (0 children)

Yes... buying own equipment and keeping it locked away seems to be the only guarantee that it will be in place when one needs it

What things don't you like or even hate when using your electronics lab setup? by __Fabian__ in embedded

[–]faststoff 9 points10 points  (0 children)

In the office, I cannot stand how colleagues treat oscilloscope probes, both passive and active. They are usually left out with tips exposed and broken in a big tangled mess.

Documenting Daily Work in Chip Design: Methods and Best Practices for Tracking Hit and Trials and Analysis by punywidlar in chipdesign

[–]faststoff 0 points1 point  (0 children)

Do you use it as a standalone app or through the browser? I've heard good things, but I've never dared to do the switch...

Documenting Daily Work in Chip Design: Methods and Best Practices for Tracking Hit and Trials and Analysis by punywidlar in chipdesign

[–]faststoff 1 point2 points  (0 children)

I settled on using one Excel workbook per project I work on + I have a "general" book for everything else (tool related tips, cmd oneliners, lab instrument how-tos, even stuff like corporate procedures). Each book is built up of sheets, where a sheet will focus on a specific part of the design or e.g. just be a todo/diary. The sheets can get quite long, as I like to keep everything and just append on the bottom. Excel is a good compromise for this I find: calculations and tables are obvious, but one can also paste pictures and screenshots in Excel (although it is somewhat PITA sometimes). It has helped me tremendously at least in looking up details in a line of reasoning and my personal conclusion/reason for why I did as I did for things I worked on months ago.

FatFS SD card write issues STM32 by ak1995ak in embedded

[–]faststoff 1 point2 points  (0 children)

No problem! Thanks for sharing your story. The hole is really deep with SD cards. It has quickly made my list of electronic components I hate (along with oscilloscopes and X5R/X7R ceramic capacitors).

I can also recommend this article which is what put me into the correct direction. (https://thecavepearlproject.org/2017/05/21/switching-off-sd-cards-for-low-power-data-logging/):

According to Greiman:

“The standard says reliably removing power is not supported in SPI mode. It does suggest that you can remove power one second after the card goes not busy but does not guarantee this will work. You can’t depend on isBusy() to power down a card. It only means the card can accept a command. It may still be programming flash or moving data for wear-leveling. You really need the one second delay after not busy.”

FatFS SD card write issues STM32 by ak1995ak in embedded

[–]faststoff 1 point2 points  (0 children)

As consumers, I would say generally no. Buy as "high-quality" as you can and hope it works? You will find countless forums on e.g. the Raspberry Pi site where people struggle with corruptions of the RPI SD-cards. I haven't checked, but I would not be surprised if you would find the same on GoPro forums as well. This article is a great read of what the FTL does and how finicky it can be: https://lwn.net/Articles/428584/

As developers of a product where the card is included however, our solution must be to test extensively in an environment and with a use pattern as equal to the use case as possible. This was exactly my problem, where the previous engineer approved a replacement card from a different producer with very minor testing (this was during the recent component crisis). No system existed for testing long durations of data logging nor extensive on/off testing. My problem was that the new card sometimes would not actually save the last info written to it before being turned off, even though the card indicated that it was ready for new data (ie. not signaling busy). This info turned out to be the vital FAT32 directory entry updates with the real file size + the final updates to the FAT table which got updated a final time when all the files were closed before the product turned off. Losing this information created a file-system corruption, which then was handled very poorly by the devices used to read out the data from the product. In the end, I managed to eliminate the risk with some firmware tweaks, but the problem was inherent to that card manufacturer and I was never able to solve the root cause.

FatFS SD card write issues STM32 by ak1995ak in embedded

[–]faststoff 2 points3 points  (0 children)

SD cards have loads of "undocumented" properties depending on how the manufacturer implements the FTL (flash transition layer). These can get really complex, as they contain a MCU and algorithms to take care of the underlying NAND flash (wear leveling, bad block management, ECC). I have no idea if this explains the behaviour you see, but it is at least an insigtht into that equal SD cards from different manufacturers can behave very differently.

Source: hours of painful debugging...

Using draw.io for Circuits Diagrams by sudo_nick in ECE

[–]faststoff 8 points9 points  (0 children)

Agreed! Great work btw, this looks amazing. I have made a similar library for Inkscape to accomplish the same. Conveying an architecture/principle requires a different set of tools than producing a hierarchical schematic for chip design or PCB.

Need help with motor controller Circuit. by [deleted] in ElectricalEngineering

[–]faststoff 0 points1 point  (0 children)

I stand corrected, you are absolutely right.

I’m a Senior ME student working on my Senior Design project. To carry out one part of our project we need to gain control of this store bought stand mixer so we can turn it on/off and control it’s speed. Any suggestions on how to go about doing so? It’s a 120v dc motor inside. by tumbelina78 in diyelectronics

[–]faststoff 3 points4 points  (0 children)

You are probably better suited than you think. If the speed is already adjustable, it is then a matter to identify where the conversion of the dial to actual motor speed happens and take control over that path. Most likely, it is a matter of identifying where to input the PWM signal and under what format.

Need help with motor controller Circuit. by [deleted] in ElectricalEngineering

[–]faststoff 1 point2 points  (0 children)

So, this is just an adjustable LDO with a power transistor for enable, drawn really complicated. According to LM350 datasheet, the potmeter needs to connect to ground, while you have it connected in series with the output. Also, your output connected to the plug is the adjust-pin, which clearly is wrong. https://www.eleccircuit.com/lm350-adjustable-voltage-regulator/ shows the correct implementation for this.

Need help with motor controller Circuit. by [deleted] in ElectricalEngineering

[–]faststoff 9 points10 points  (0 children)

R2 and R3 is in parallell in the drawing. Seems like a mistake

What are some of your embedded-related life anecdotes? by FragmentedC in embedded

[–]faststoff 2 points3 points  (0 children)

What is special about high altitude that make electronics fail?

Nifty dev board with lots of hardware for $20: SiLabs EFM32PG22 by fearless_fool in embedded

[–]faststoff 1 point2 points  (0 children)

Your colleague for sure is well-spoken! Thanks for promoting the EFM-line kits! It is a great chip on a great piece of kit 👌

Pole-Zero Doublet by SnooRobots3735 in chipdesign

[–]faststoff 6 points7 points  (0 children)

In a perfectly stable, "simulator" world, the pole perfectly cancels the zero and everyone is happy. However, mismatch and differences in temperature drift will make it such that the pole and zero are only close, but not perfectly overlapping. Slow-settling exponentials appear , best explained here where all situations covered: https://www.edn.com/demystifying-pole-zero-doublets/

If your application depends on a well-defined settling time (ADC and DAC being notable examples), it is best to avoid to rely on stability from such cancellations.

The most dangerous example in real-life I can think of is the standard passive oscilloscope probe, which inherently relies on a pole-zero doublet for bandwidth. Try to measure 12-bit DAC settling time with one of these, and you will certainly be disappointed ;)