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Is wienbridge oscillator use both positive and negative feed back?
Wiki User
∙ 10y ago
it uses positve feed back
Wiki User
∙ 10y ago
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Why negative feed back used in oscillator?
A positive
Why is positive feedback used in oscillators?
Positive feedback is used in oscillators to keep them running or oscillating. An oscillator is basically an amplifier which has a feedback path from the output back to the input. This permits a portion of the output signal to get back to the input to "keep things going" in stage - to keep things oscillating. The feedback must be positive so that it will "contribute" to the stage being able to keep oscillating. If the feedback was negative, it would serve to damp the oscillation and to "kill" the oscillator.
How can an amplifier become an oscillator?
An amplifier can become and oscillator by adding positive feedback from the output back to the input. Positive feedback means that the phase of the signal fed back to the input is the same as the phase of the output signal. In the case of a high frequency oscillator, a tuned circuit (inductor and capacitor) or a quartz crystal in the input circuit will determine the frequency of oscillation.
Difference between the negative and positive feedbacks?
In Amplifier if feedback is occures when the feedback signals is in phase with the input signal the feedback is known as Positive feedback. And the feedback is occures when the feedback signals is out of phase with the input signal the feedback is known as negative feedback.
What is the fead back factor in oscillator?
The feed back factor in the oscillator refers to the output which is usually sinusoidal.
Can your test come out positive then negative?
If it's a pregnancy test the answer is no, A test can come back negative even though its positive. But if it's positive, it's positive 99% of the time.
Parathyroid glands is a negative or positive feed back?
Negative. There are VERY few positive feedback mechanisms in the body- the only one i know about is birth. Think of negative feedback and positive as a line.
Is placid negative or positive?
It depends on the context. It may mean quiet, unruffled (positive) or it could mean too laid back to do anything (negative).
How do you hook back up a car battery?
Connect the Positive + battery cable to the positive + battery post first. Then connect the Negative - cable to the negative - battery post.
Are hormone concentrations usually controlled by positive feed back?
no by negative feedback
Does a negative or a positive result come back quicker on a paternity test?
Equal
What causes alternating current?
It goes back between a positive and negative current
