Stable ultra-low frequency triangle wave-square wave oscillation circuit

This circuit is composed of a hysteresis comparator and an inverting integrator, and the time
constant of the discharge is exposed by the integrating resistor. And the capacitor co is determined. You can
check whether oscillation starts based on whether the Ai output is in a positive or negative saturation state when the power is turned on . If the Ai output
is positive, the voltage of the limiting circuit composed of DiNDE is the Zener voltage plus
the forward voltage drop v of the diode, and let this voltage be Vo. The integrator integrates tenrorr and outputs
voltage e. = -VOH/Cr0． Ro(V/sec), reaches saturation quickly. Positive feedback voltage
. , = -e. When , the output of Ai will be inverted, and the voltage is - VOL. It is
designed according to R,=Ra. If mouse>Rz, e. The Ai output will be inverted when it becomes more negative.
The integrator then integrates - VOL, and the output can obtain a positive slope,
ea=VOL/C. ． chu． (V/sec), when-ef =e. When, the Ai output is inverted again, and
the above process continues, allowing the oscillation to continue.