Op amp question

vk6kro

Yes, that's exactly right.

If I juggle the input very carefully, I can get it symmetrical as in your drawing. See attachment.

Otherwise it either has a slope on the leading or trailing edge.

At no time does it go high and stay high like the simulation predicted.

From the poster's point of view, this is just a wave shaper and it will not generate time delays like he was hoping for.

Attached Thumbnails

 

negitron

Which brings up a point: if the OP wants time delays, why not a delay line? Cheap, reliable and easy to implement.

vk6kro

Yes.

Also, if he wants longer ones, there are dedicated monostable chips (like the 74C221) or programmable ones like the Picaxes for delays from 1 mS to years.

vk6kro

Negitron, I should have asked what kind of delay lines you mean. Like in TV sets?

This circuit behaves just like a comparator if you just vary the DC input levels. You hardly notice the poor rise and fall times caused by the capacitor.

So, whether you call it a comparator or an integrator depends on the input frequency.
It is a little of both.

negitron

I mean one of these.

vk6kro

I haven't heard of those for years. There were some magazine articles about using them to get echo effects.
Have you used them for anthing else?
Looks like they'd be fun to play with.