Forums » CircuitLab Feature Requests

Currently the ending value has to be more positive than the starting value. Maybe there's a way to do this now, but I haven't found it.

Thanks

That would imply reversing the arrow of time, i.e. running a transient anaylsis from the end back towards the beginning, so it would make no sense in a Time Domain sweep.

Are you sure that you don't mean in a DC Sweep?

That does make sense.

:)

No. Maybe I wasn't clear enough. I'm talking about ramping voltage in a negative direction. Currently the ending voltage is required to be more positive than the starting voltage

Sorry: don't understand.

What voltage?

Do you mean in a Voltage or a Current source?

Can you give an example?

In the meanwhile are you aware of the PWL() function?

https://www.circuitlab.com/docs/expressions/

https://www.circuitlab.com/blog/2012/04/13/piecewise-linear-and-piecewise-step-sources/

https://www.circuitlab.com/forums/support/topic/7c6kp895/simulating-switching-circuits/#comment_2741

Thanks for the tips on the PWL function. I haven't used it and forgot it was there.

I mistakenly labeled this forum topic. It should have been titled "Allow ramp down in DC sweep analysis". No wonder you didn't understand my request.

A hah!

So you did mean a DC Sweep.

Here's a way to do a sweep in either direction:

https://www.circuitlab.com/circuit/84tt9t/how-to-set-up-a-sweep-to-see-a-hysteresis-loop/

Have fun playing with it!

:)

Thanks. I see what's going on with the input. I haven't played around with much in CL other than some pretty basic fixed value stuff. I haven't set up any inputs with equations yet.

Thanks a lot. I will give it a shot.