I'm surprised to see Simetrix put Vcc and Vee on the wrong side
I flipped the symbol.
- Your biggest error was R1 to Vref which altered Vref into a non-triangle wave. Use buffered Vref. or gnd as I said.
- Next choose lower R from Triangle (Integrator) out which integrates around Vref and a bigger R from Square wave feedback to Vin+ feedback, which changes hysteresis and f but reduces error from non-rail-to-rail SQR out.
- So swap R2<>R3. Now R1 may not help or is needed as much , so R1 to ground is near 390k for 50% d.f. and just below 10 Hz
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I'm surprised to see Simetrix put Vcc and Vee on the wrong side
I flipped the symbol.
Regards, Dana.
I did not keep the same naming, should have. Just used the orig circuitMy simulators only swap inputs not the whole symbol.
But I am also surprised you also swapped R2, R3 but never mentioned it.
Your biggest error was R1 to Vref which altered Vref into a non-triangle wave. Use buffered Vref. or gnd as I said.
please read again. The label is not buffered, but the optimal bias was not discussed with criteria for mixed feedback amplitude. Reducing Square feedback also helped this but reduced Triangle output at same timeHi,
there is no error at all. The initial question was how the below circuitry recommended in the datasheet of the LM358 works and how to determine its frequency. Reply #4 address the equation in question. Further, the Vcm problem at Vcc = 5V, if using a bipolar opamp was mentioned there as well.
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