In this circuit there is a bjt astable multivibrator. It generates a square wave. And according to the description, at the output of the opamp it generates a triangle wave from this square wave.
I've tried to implement this circuit in LTSpice.
When I simulate output of the first circuit (astable multivibrator) looks fine.
But if you look at the output of the opamp there are some glitches rather than triangle wave.
What might be wrong with this circuit here.
I changed the value of R6 resistor to 1000000 ohms but still output of the opamp doesn't look like a triangle wave.
Edit2 : After playing around with potentiometer values,I should be able to see a waveform which looks like triangle at the output of opamp.
But if I increase the simulation time from 100 milli seconds to 700 milli seconds I see DC 15 volts at the output of op amp. I don't know why this happens.