Triangular Wave Guidance

[LarsNor]

I figured out my circuit in PSpice, but i faced with problem. It work with 1Khz, but i need 10 Khz and i can't to adjust it because i'm loosing signal. Who knows how to adjust it?

When i reduce C2 or R4 more i have the last one picture

 

[MikeMl]

One problem is that you are using 741s. Look up the Gain vs frequency of that old, obsolete, crappy opamp.

Another problem is that you are using only +-5V supplies (were it just barely begins to work), and a 741 is not even close to being rail-to-rail output, which you need for the peaks of the triangle wave to reach close to the + and - voltage rails.

Try a modern rail-to-rail cmos opamp!

 

[LarsNor]

One problem is that you are using 741s. Look up the Gain vs frequency of that old, obsolete, crappy opamp.

Another problem is that you are using only +-5V supplies (were it just barely begins to work), and a 741 is not even close to being rail-to-rail output, which you need for the peaks of the triangle wave to reach close to the + and - voltage rails.

Try a modern rail-to-rail cmos opamp!

What can you advice for 5 volts? i tried few but it didn't work

 

[MikeMl]

This one is rail-to-rail, is fast enough, and runs on 5V. I'm showing how to run it on a single 5V supply. Note the rise and fall times on V(y). Note the frequency it is running at.

Go and re-read Crutschow's post (#69)

Any of these I found at Digikey would work (DIP, rail-to-rail, low-voltage, fast slew rate).