The question is about the above Schmitt trigger indented to convert AC signals to pulses. As seen, I use V2 as input in the simulation.
The circuit above works both in LTspice and breadboard when I use a function generator for the input. So far so good.. But if the input is coming from a "permanent magnet AC generator" things are not the same. Let me summarize the situation:
The above circuit works for a given input signal by a function generator let’s say the input is set to: 1V amplitude 100Hz sinusoidal
Then I adjust the output of the permanent magnet AC generator to 1V 100Hz sinusoid as well
Now we have a function generator and a permanent magnet AC alternator where both output identical signals
But the above circuit doesn’t work and acts weird when the input is from the permanent magnet AC alternator. It works fine when it is from the function generator.
For an empirical test I removed R8 and C3 in the above circuit and the circuit works this time for the permanent magnet AC alternator input.
My questions are the following:
1-) What is the difference here between the function generator and the permanent magnet AC generator(alternator), I mean why the same input signals result different outputs. (My guess was maybe the inductance of the inner windings of the generator is coupling with the caps?)
2-) If my guess is the real reason V2 can represent the function generator but not the alternator? And if so, how can I model this kind of input in LTspice.
edit: Sometimes randomly I get some output instead of A as B: