so what is the problem with this circuit?The 1k pullup resistor at the output prevents the opamp from producing crossover distortion because the lousy old LM358 is one of the first Low Power opamps with its output transistors starved for current in class-B instead of being in class-AB.
With a negative input voltage then the inverting opamp output cannot saturate, instead it goes positive.it gives Vsat directly without ramp. i need it to increase gradually
when i use this circuit with two opamp . proteus stopped faild to start when i connect power to the schmitt trigger opampThe circuit is not a triangle-wave generator that needs to have an additional Schmitt Trigger opamp. A triangle-wave consists of TWO ramps, one going upwards and the other going downwards.
Here is a typical triangle-wave generator circuit:
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With a negative input voltage then the inverting opamp output cannot saturate, instead it goes positive.
Here is your circuit without the messy grid lines:
what do you suggest?Frequently a simulated oscillator needs to have a KICK to get it started.
Maybe your integrating capacitor has backwards polarity?
For sure.i tried ceramic capacitor , the same result . it gives vsat directly
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