ODP: Saw to triangle problem - NOT ANYMORE :)

[Mikko Helin]

>From: Roman Sowa <rsowa at WizjaTV.pl>
>
>Hi all!
>
>Why do always simple tasks are done the hard way?
>What would you say about 2 opamps, 2 resistors and 1 diode design?
>And very old one too...
>
>imagine standard inverting amplifier with gain =3D -1.
>insert diode between opamp's output and feedback resistor.
>anode toward opamp if you want positive output, or cathode otherwise.
Nice.

>use second opamp as a follower connected to the diode-resistor node.
>voila!
>
Or use the second one as an inverter and connect the (+) input
to reference voltage (100k trim pot from GND to V+ or V-
depending on how the diode is connected) to set some offset for
the triangle to get it symmetric around zero.


-Mikko