Perky123
New Member
Hello guys,
this is the second thread I am posting in this great forum, hoping that you will help me just like the last time few weeks ago (special thanks to Boncuk and eblc1388). This time - Op Amplifier diagrams.
I have the following arrangement and values given: (problem.jpg)
the questions are:
a) Draw the graph of U2
b) Draw the graph of U3
c) Draw the graph of U4
The solution is given in solution.jpg.
So my issues are:
a) more then clear that U2=U1. So - ok. (U1 graph is given!)
b) Using the formula for an "Integrator" (integrator.jpg) which according to my sometimes pure mathematics knowledge yields U3=(-1/RC)*U1*t, I calculate that for the time interval 1<t<3, U3 changes from 0 to -6V (t=2ms, U1=3V).
So far so good. Doing it the same way but setting (t=3s and U=-1V) for the time interval 3<t<6 I get that U3 is supposed to change to 3V... unfortunately the solution given says -3V!?? How come!?
And how come for 6<t<8 U3 contiues to be -3V, while U1 is 0V!?? What am I doing wrong!?
c) absolutely no idea how to combine U2 and U3 to draw this![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Thanks a lot in advance!!
Veni
this is the second thread I am posting in this great forum, hoping that you will help me just like the last time few weeks ago (special thanks to Boncuk and eblc1388). This time - Op Amplifier diagrams.
I have the following arrangement and values given: (problem.jpg)
the questions are:
a) Draw the graph of U2
b) Draw the graph of U3
c) Draw the graph of U4
The solution is given in solution.jpg.
So my issues are:
a) more then clear that U2=U1. So - ok. (U1 graph is given!)
b) Using the formula for an "Integrator" (integrator.jpg) which according to my sometimes pure mathematics knowledge yields U3=(-1/RC)*U1*t, I calculate that for the time interval 1<t<3, U3 changes from 0 to -6V (t=2ms, U1=3V).
So far so good. Doing it the same way but setting (t=3s and U=-1V) for the time interval 3<t<6 I get that U3 is supposed to change to 3V... unfortunately the solution given says -3V!?? How come!?
And how come for 6<t<8 U3 contiues to be -3V, while U1 is 0V!?? What am I doing wrong!?
c) absolutely no idea how to combine U2 and U3 to draw this
Thanks a lot in advance!!
Veni
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