[sdiy] frequency doubling follow-on

[Tony Clark]

> I'm not sure how to full-wave rectify, however.

   Take a look here:

   http://aupe.phys.andrews.edu/diy_archive/schematics/waveshapers/

   The Saw-to-Tri converters on that page are full-wave rectifiers.  The 
schottky one is the one I came up with.  The circuit actually runs 
better if you use 4.7k resistors instead of the 10k ones shown on the 
first op-amp.  The second op-amp corrects for level and amplitude.
   But if you want simpler, the second one by Tadej Bozicko is it.

   Cheers,

   Tony

-----------------------------------------------------------------------
  The E-Music DIY Archive - http://aupe.phys.andrews.edu/diy_archive
-----------------------------------------------------------------------

"We wouldn't want to ship something that doesn't work"
   - Carl Stork, general manager, Microsoft Windows division
     Excerpt from EE Times April 2, 2001