Triangle VCO and other tragidies

[patchell]

    I just finished breadboarding and powering for the first time the
Triangle VCO I proposed a couple of weeks ago.  This is similar to the
idea that Ian Frizt posted on his web site about a month ago now I
think.  Instead of using CMOS switches, I used J174 P-FETs.  All I wired
up was the core (no exponential converter), and all I can say at the
moment is that it makes a triangle.  I have other things to attend to at
the moment, and hope to get back to it latter today to fix some minor
problems (it jitters at the moment), and to make some measurements, like
delta offset versus frequency.

http://www.silcom.com/~patchell/jp2rest/trivco_2.pdf

    And the tragidy...

    My SMB board schematic has been updated.  Somehow, when I created
the part model for the THAT120, I was looking at the wrong data sheet.
I discovered this when I went to draw the Orcad schematic for the
Triangle VCO above and discovered the pins on my sketch did not match
what was coming up on the screen.  DANG!  Only an inconvienence, but
still......

http://www.silcom.com/~patchell/smb1/smb.pdf

--
 -Jim
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