ODP: Saw to triangle problem - NOT ANYMORE :)

[Roman Sowa]

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 = -1.
insert diode between opamp's output and feedback resistor.
anode toward opamp if you want positive output, or cathode otherwise.
use second opamp as a follower connected to the diode-resistor node.
voila!

Roman

> -----Oryginalna wiadomość-----
> Od:	Tadej Bozicko [SMTP:tadej.bozicko at uni-mb.si]
> Wysłano:	8 września 1998 15:35
> Do:	Synth DIY
> Temat:	RE: Saw to triangle problem - NOT ANYMORE :)
> 
> Hello!
>  
> After two nights of bugging with this rounded top of the triangle
> waveform I solved the problem! Yes way!
> Finally diodes got the boot, because of their knee. Away with them.
> New design uses two opamps (they are cheap anyway) and a transistor
> (ordinary NPN) and a bunch of resistors. The schematic is available
> at: 
> <http://imola.uni-mb.si/~bozicko/saw2tri_v2.gif>
>