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Dennis Feucht

An Isolated Potentiometer, Part 1

Dennis Feucht
salbayeng
salbayeng
3/18/2016 9:33:03 PM
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Newbie
Not really "isolated"
Hi Dennis, nice article, 

But it's not really "isolated" it's just floating, more of a  flo-pot.

It's fairly simple to achieve an isolated "pot" by chopping the wiper voltage between pot+ and pot- at a frequency well above the signal bandwidth, and filtering the output, and the chopping signal can easily be opto coupled (preferably with an I2C type coupler for better linearity). The chopping signal can be generated with a dual CMOS R-R opamp. 

 

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smithrobin
smithrobin
2/16/2016 7:00:46 AM
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Newbie
Re: illegible schematic
nice post thank you

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steve.taranovich
steve.taranovich
1/30/2016 12:09:22 AM
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Blogger
Schematic image is now enlargeable
Please click below the image to enlarge---sorry about the oversight

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steve.taranovich
steve.taranovich
1/29/2016 7:32:45 PM
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Blogger
Re: illegible schematic
Sorry everyone---I will be adding an enlarged image shortly

 

Steve Taranovich

Editor-in-chief

Planet Analog

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Dhyanbhand
Dhyanbhand
1/29/2016 8:49:31 AM
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Newbie
Re: illegible schematic
Saving the image and increasing the magnification just brought up a blurry image.

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didymus7
didymus7
1/28/2016 7:08:12 AM
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Newbie
Need better schematic
The schematic included in this article is of very low resolution, even clicking on it, you get the same low resolution image.  Reading the text on it is difficult to impossible.

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Peter.Olson
Peter.Olson
1/27/2016 11:52:22 PM
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Newbie
illegible schematic
The schematic is of such a low resolution that I cannot make out the features such as pin numbers and component designations you are referring to in your explanation.  I tried clicking on the pointer live in the image, but it was no larger.  Saving the image and increasing the magnification just brought up a blurry image.

It would be great if you could post a legible schematic.

Thanks.

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