@Egon-Net said in Designing a PWM to Analog mini board for fans:

Output

• Current depends on power transistor, planned BD139

Does that mean, the user can decide on his own power transistor/fet (NPN) as long as you don't exceed the maximum Current suitable for the PCB-traces (or maybe even strengthen them with solder if necessary)?

Maybe a single board may be sufficent for most users. Is it possible, do design a dual board, that can be "cut" in two indipendent halves by the user?
If thats not possible i think it would be good to have dual boards (only).

Im willing to be a beta-tester for the boards (having a watercooled toolhead with oversized loud 120mm 3-wire-fans on the radiator).
I would also be interested in up to four (4) dual boards or five to six (6) single boards of the final version.

/Julien

@wilriker said in [Poll] Time estimates on PanelDue 5"/7":

• Slicer time is what the slicer calculated it will take - this can vary wildly based on how accurate you can represent your printer configuration withing your slicer

That is quite right. For slicers like S3D its a huge problem, because you can't apply acceleration and jerk into the calculation of the time (not without post-processing). In my case, a file from S3D takes about 20-25% longer than estimated.
The most accurate for me is also the filament-time after a few layers (like DC42 explained), to tell when the print is finished.

/Julien

@Egon-Net said in Designing a PWM to Analog mini board for fans:

milliseconds, not seconds!

yeah, thats more logical

Question from a non-electrician:
The time to reach the desired Voltage takes around 90-120s, is there a way to shorten this without sacrificing precision or risking an overshoot?

/Julien

I'm interested (located in germany).
If we can get enought peoble together, maybe we can arrange a package containing all (non-soldered) components along with the PCB.

/Julien

Could it be, that the Bed runs in BANG-BANG-Mode instead of PWM?
If yes, i recommend changing that by using a SSR.

/Julien

Thanks to everyone, great answers.
I will work my way through the spreadsheet whilst trying to undertand the theory from @LB 's links.

I have to say, this is one of the few "BS-free" forums i've met. Lots of competent answers and less guesswork .

/Julien

Dear co-printers,

for an internal research paper i would like to better understand the calculations behind the emf-calculator on reprapfirmware.org.
Does anybody know (or can give me a hint/link) the formulas behind this calculator?
I am a hardcore mechanic - though basic electronics is present, such calculations exceed my knowledge.
Is there an easier way than to look through the site-code?

Many thanks in advance and greetings from germany,
Julien

@Veti said in Buffer problem?:

The Duet3 can ...

My bad, didnt check his hardware.
So to be clear: When microstepping on the Duet 3 is set to anything higher than x16, the TMC will still do the interpolation to x256?