ODP: Saw to triangle problem - NOT ANYMORE :)

[Roman Sowa]

>>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.

you can't use inverter in such configuration
because you need high input impedance - draw the shematic and look at it

but, noninverting amplifier would be ok with resistor at (-) input
connected to reference voltage instead of ussual gnd to symetrize
the triangle

Roman