[sdiy] They aren't sawtooths, they're ramps

[Donald Tillman]

   > Date: Wed, 4 Nov 2009 20:13:54 +0000
   > From: cheater cheater <cheater00 at gmail.com>
   > 
   > >   > http://www.eng.cam.ac.uk/DesignOffice/mdp/electric_web/Exper/05263.png
   > >
   > > This drawing is not correct.
   > 
   > Hmm.. hadn't looked at the drawing earlier. It is indeed
   > incorrect, the 'ramp' part of the wave is logarithmic, not
   > exponential. Seconded, that drawing is definitely wrong.

Nit picking: actually the curve is exponential.  The
charge-a-cap-through-a-resistor waveform is a 1 - exp(-t) shape.  It
may look somewhat logarithmic from a distance, but it's asymptotically
approaching the value with an exponential decay.

But nonetheless, the nomenclature in the drawing is bogus.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com