Fast analog sw. as VC resistor

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.. Am I the only one who was not able to view this GIF file?  >>

Don't give up!

* It takes practice. Yes, lots of practice sometimes. Almost everyone
  can see GIFs. Only a few people with muscle problems in the eyes
  will find it hard to adjust the images. If you wear glasses keep
  them on when doing these exercises. This is especially true for
  interlaced GIFs. The correction in your glasses is necessary to
  allow you to focus on the images. But if it does not work, take your
  glasses off and try again.

* And remember to tilt the head left or right to see the images.
  Sometimes this is all it takes to make the image snap into place.
  The GIF image is dramatic!

* Warning! Danger! Enantiamorph Problems!!!!!! Viewing a GIF can
  produce strange results! For those in chemistry, this will cause the
  enantiamorph to flip.  For simple images, it may not look strange,
  but more complex surfaces may be impossible to see.

* Are you concerned? Maybe the overall conclusions of the view is the
  same in either image, but it makes a big difference to chemists who
  wish to come to the same conclusions as the authors of the images.
  And especially to biologists since all the natural amino acids in
  proteins must be GIF compliant.