Hi. Yes, i'm asking about point with green marker. As you can see, i added capacitor, but voltage goes down, can you explain how can i raise it up?The output of U11 is centered about GND, but the output of U13 is just DC at the opamp's maximum positive saturated output value. Are you asking about adding a DC component to the output of U11 before it goes to U13? This can be done with a coupling capacitor and some bias resistors.
It's perfect. How you calculated that it should be from +1 to +9 V. What is equation can i use if i need from 0 to +5 V?
The voltage circled in red sets the center of the wave form. Try setting this to 5.5V or 6V and watch.It's perfect. How you calculated that it should be from +1 to +9 V. What is equation can i use if i need from 0 to +5 V?
It works perfect if i have power supply -5 - +5 VThe capacitor you added prevented a reference voltage on the (+) input of the 3rd opamp.
Your SIM program did not read the datasheet for the TL031 opamp:
1) The TLo31 opamp inputs do not work if they are within 1.5V from the -5V supply but your 3rd opamp has its (- ) input directly at -5V so it will not work.
2) The output of a TL031 opamp cannot go anywhere near the +5V power supply voltage, some will go only as high as +3V.
The stupid SIM might work but the real circuit will not work.It works perfect if i have power supply -5 - +5 V
This circuit is usual Schmitt trigger+differntiator, nothing especially. I saw few videos where circuit workedThe stupid SIM might work but the real circuit will not work.
1) An opamp cannot work without a DC reference voltage on its (+) input within its common mode input voltage range.
2) The output of a TL031 and most other opamps cannot go anywhere near its +5V supply voltage.