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Answered 2009-04-09 03:56:00

An amplifier becomes an oscillator when positive feedback is applied. It is the simple way to do it.

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There are many different types of oscillator circuits, the majority of which use positive feedback.


Yes because an amplifier with positive feedback is an oscillator.


An amplifier is usually stabilized by means of negative feedback. An oscillator is an amplifier which is made unstable by means of positive feedback.


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.


It can contain active and passive components with a positive feedback loop.


A; ABSOLUTELY most have power to begin with and must have a positive feedback


By introducing positive feedback from output to input


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.


A: An op amp to be stable must have some negative feedback. If the feedback is positive then it can become an oscillator.


A: Very easy to do just provide a positive feedback and/or a phase shift it will oscillate


i will put tank ckt and give it to transistor via positive feedback


the types of feedback are positive and negative feedback


In positive feedback, the system moves the variable further and further away from the set point of the variable. In negative feedback, the system moves the variable back to the set point.Another answerNegative feedback will stabilize an amplifier. Positive feedback will force an amplifier into an unstable state. This holds true for any other system too.Another AnswerNegative feedback subtracts a portion of the output from the input signal. Positive feedback adds a portion of the output to the input. Both are useful. In an amplifier, negative feedback increases stability and bandwidth, but reduces gain. Positive feedback produces an oscillator.


there are four types of feedback connetion. the one used is that which amplifies your input (Positive feedback).


A Wien bridge oscillator produces sine waves. In order for the sine waves to maintain a steady amplitude, a positive feedback system is used with some sort of control to limit gain. In order for the positive feedback system to work, the waves being "fed back" to the amplifier have to be in phase with the waves being generated. Thus, you need a phase shift network to ensure that the phases of the waves match, which in the case of a positive feedback system means that the generated waves need to go through a 360o phase shift during the feedback process.


A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~ A Colpitts oscillator is the electrical dual of a Hartley oscillator. The Hartley oscillator is an LC electronic oscillator that derives its feedback from a tapped coil in parallel with a capacitor. http://en.wikipedia.org/wiki/Colpitts_oscillator http://en.wikipedia.org/wiki/Hartley_oscillator ~MECHASUN~


To isolate the bias circuitry of the transistor from the feedback network with RF currents.


Rc phase shift uses negative feedback.. Weinbridge uses both +ve and -ve feedback


A: Any feedback that contributes to the input is positive feedback any feedback that subtract from the input is negative feedback


oxygen loading is a positive feedback response


For ac usually is a non linear resistance that can be used to change frequency Or a relaxation oscillator can supply square waves and filter it to get the basic frequency.. piratically all of them needs some kind of positive feedback


positive feedback is always benificial but regenerative feedback may or may not.


Positive Feedback--It reinforces the stimuli


No, negative feedback is the primary homeostatic mechanism regulating the endocrine system. Positive feedback is used much less frequently.


Positive feedback increases a process and negative feedback decreases a process. An example of positive feedback is uterine contractions during labor. The positive feedback mechanism works to keep increasing the contractions until delivery is complete.



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