Push the button.
This circuit uses non-inverting schmiit trigger combined with integrator to produce triangle waves.
The principle is simple, the comparator produces unit step voltage the integrator integrates it and produces ramp voltages at the output, the schmiit trigger switches it's states at +-7.5V so when the integrator output reaches the switching voltage, the comparator switches it's state which intern changes the direction of rise of integrator output.
The frequency of oscillation can be changed by changing the time constant of the integrator, and the peak output voltage can be altered by changing the feedback resistor on the comparator.
Connected a potentiometer to vary the duty cycle of the square wave in turn varying the triangle wave from forward to backward.
