Trying to run a circuit with 74123 one shot

[STINGERX]

i’m trying to run this circuit but i don’t realy understand what is the problem?
as you can see in the attached image this is how i connected the circuit into an integrator on pspice.

 

[crutschow]

Since you didn't say what your problem is, I don't understand the problem either. :???:

 

[STINGERX]

Since you didn't say what your problem is, I don't understand the problem either. :???:

sorry

i want to design a circuit that summarize (with the integrator) the pulses from a photodiode, to do this i need to use one shot circuit but I don't really understand how to connect it to the integrator and from the pulse generator
pspice shows me errors that say's there are floating connections

any suggestions?

 

[crutschow]

What is the purpose of the one-shot in the circuit? Is it to reset the integrator after integrating the pulses?

If Pspice says there are floating nodes then you need to determine where they are. I don't offhand see any in your schematic.

 

[betwixt]

Mind you, a one shot with a 1pF timing capacitor which feeds a 741 is asking for trouble. I think a somewhat faster op-amp might be a good idea.

Brian.