Hello I try to convert an analog signal to block waves when the signal comes at a certain voltage.
On the sim on the green signal you see the 4 small positive peaks I want to be causing the output of U3 go high.
Don't mention the rest of the circuit.
But I do not succeed with this Schmitt trigger. Any idea?

 

Try this mod. I've never got the LM324 model to work very well, so used LT1006 instead.

 

Thanks, This looks much better. In fact I want to use a LM358 but this model was not working (either) and I took the LM324-model instead. Do you think this will make a difference once realised?

 

Hello again. I tried your way here. I saw you changed also things around U1. This one has to stay as it is since I need that signal. So after putting U1 periphery back (as in .asc) and with my PWL, U3 doesn't creates the 4 square waves as I would like. Can U check what's wrong.

 

Hello I try to convert an analog signal to block waves when the signal comes at a certain voltage.
On the sim on the green signal you see the 4 small positive peaks I want to be causing the output of U3 go high.
Don't mention the rest of the circuit.
But I do not succeed with this Schmitt trigger. Any idea?

Hi

Try this LM324 model attached. The zip file include the test file shown below







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