akbarza
Full Member level 2
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hi
i attached a circuit and i have question about it.
i before posted this circuit in allaboutcircuit.com( in that moment, the circuit did not oscillate. because the plus input and minus input were reverse. in that site, persons lead me and said that if i change the two input , the circuit oscillates.)
(in attached pic, the inputs are right now.)
my first question is that as we now the two inputs are equal, why in reverse state of inputs, it does not oscillate?
second, can any one explain why this circuit oscillate, and what happen?
third: we know positive feedback cause oscillation. in this pic, we have positive feedback(R1-R2) and negative feedback(R3-C branch).for having oscillation, namely positive feedback>negative feedback, what condition(s) must be valid?
thanks
i attached a circuit and i have question about it.
i before posted this circuit in allaboutcircuit.com( in that moment, the circuit did not oscillate. because the plus input and minus input were reverse. in that site, persons lead me and said that if i change the two input , the circuit oscillates.)
(in attached pic, the inputs are right now.)
my first question is that as we now the two inputs are equal, why in reverse state of inputs, it does not oscillate?
second, can any one explain why this circuit oscillate, and what happen?
third: we know positive feedback cause oscillation. in this pic, we have positive feedback(R1-R2) and negative feedback(R3-C branch).for having oscillation, namely positive feedback>negative feedback, what condition(s) must be valid?
thanks