New PWM Circuit Question

[Farlander]

Hey guys,

I'm currently building a new PWM, as shown below.  Does anybody have any ideas why this design would not work?  It's simpler... KISS
(2)Quad op amps-- first, one high gain amp is paralleled with a capacitor.  This produces the up and down sawtooth wave, adjustable via a potentiometer (though still not sure how).
The second amp acts like a trigger.  When Vin > Vref, the chip fires it's output.  WaLA you get a square wave

students.umw.edu/wfc%20site/lm324 Function Generator.bmp

[pese]

Error 404
students.umw.edu
Monday, September 15, 2008 18:05:01
Apache/2.0.59 (NETWARE) mod_perl/1.99_12 Perl/v5.8.4 mod_nsn/1.1_0 mod_jk/1.2.15

GP

[vdubdipr]

do you go to uwm pese?

[pese]

do you go to uwm pese?

if i try to open above link
i receive this error message... (linux)

Pese

[Farlander]

sorry here's the schematic