[sdiy] exponential converter details

[Jay Schwichtenberg]

Nick,

You might try Rene's WEB site: http://www.uni-bonn.de/~uzs159/  "Whats that
exp and tempco stuff?" That will give a general overview. The cap in the
circuit is to stabilize the circuit and keep it from oscillating.

Jay
  -----Original Message-----
  From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Nick Liebrecht
  Sent: Thursday, November 06, 2003 8:37 AM
  To: synth-diy at dropmix.xs4all.nl
  Subject: [sdiy] exponential converter details


      crap,  i put the wrong URL on here.  The correct one is


      http://darkwing.uoregon.edu/~nliebrec/Expo.pdf

      -nick


      ---- Begin Included Message ----

      From: "Nick Liebrecht" <nick at dreamtheater.zzn.com>
      Sent: Wed, 5 Nov 2003 22:16:57 -0800
      To: synth-diy at dropmix.xs4all.nl
      Subject: exponential converter details


      Hi all,

      I am having some trouble thinking through the typical expo converter
      circuit.  The circuit i'm referring to is posted here.

      http://darkwing.uoregon.edu/~nick/Expo.pdf

      It's taken from Barry Klein's book.I understand the CV ranging/scaling
      part, but the actual current part is confusing me.  I recognize the
      actual current source built around the op amp, but I'm fuzzy about
      what all the parts do, especially the capacitor.

      Can anyone explain this circuit to me?  I want to learn why the
      certain part values were chosen, and with what equations.

      Thanks in advance,
      Nick Liebrecht



      A-ren-nen-nen-ah-ren-nen-nen
      A-ren-nen-nen-uh-rennda
      A-ren-nen-nen-ah-ren-nen-nen
      A-rennda-rennda-rahhh

      ---- End Included Message ----






      A-ren-nen-nen-ah-ren-nen-nen
      A-ren-nen-nen-uh-rennda
      A-ren-nen-nen-ah-ren-nen-nen
      A-rennda-rennda-rahhh
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