Announcement

Collapse
No announcement yet.

PWM controlled LCR-0202 test with temperature indication

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #31
    New results are almost amazing!
    Look at the plots of the mean value of 1024 analog readings and the R2 of the formulas:

    Click image for larger version

Name:	LCR-0202-33k-bypassed-1k-leak-1024mean-C&D.jpg
Views:	1
Size:	67.7 KB
ID:	848112

    Click image for larger version

Name:	LCR-0202-33k-unbypassed-100k-leak-1024mean-A&B.jpg
Views:	1
Size:	66.2 KB
ID:	848113

    Comment


    • #32
      A simple look up table can be used to linearize (or other law) that with much greater accuracy that the typical potentiometer that uses a couple linear tracks to approximate the desired law.
      Experience is something you get, just after you really needed it.

      Comment


      • #33
        Exactly. I'm preparing some PWM/Ohm arrays for most used values, both for lin and log pots.

        Next step will be a 9V supplied voltage divider with a 1 M resistor from 9V to one LDR (upper part of the pot) to another LDR (lower part of the pot) to ground. This way I can better measure that not only the rotation is correct, but I can also keep the whole pot value (LDR1 + LDR2) constant, as a real pot.

        Comment


        • #34
          Would it be possible to change the title of the thread?
          Who's the person I have to ask it?

          Thanks

          Comment


          • #35
            Originally posted by Roberto View Post
            Would it be possible to change the title of the thread?
            Who's the person I have to ask it?

            Thanks
            I'm pretty sure it cannot be done.
            Experience is something you get, just after you really needed it.

            Comment


            • #36
              I would like to implement a developement of this idea into an upgraded HMI version.
              A single 12ax7 cascaded double triode where I change some parameters by transposing this web page:

              http://www.trioda.com/tools/triode.html

              in C for a 3,5" HMI connected to an Arduino Due/Mega: I can show the main parameters on the HMI and hear what I'm seeing.

              Some of you guys know how I can translate that page into C, or at least how to determine first five harmonic distortion amount and all other parameters?

              Thanks alot.

              Comment

              Working...
              X