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What are four different effects of feedback on the function of an amplifier?
Wiki User
∙ 11y ago
1. Negative feedback can increase linearity at the expense of losing gain.
2. & 3. Positive feedback can result in large increases in gain until the increases becomes so large that oscillation occurs.
4. Positive or negative feedback at one frequency can result in enhanced or decreased response to that frequency.
Wiki User
∙ 11y ago
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What are the effects of feedback on stability and sensitivity?
Context?
What is buffer amplifier and its applications?
A buffer amplifier is a type of operational amplifier that amplifies your input signal with a gain of 1 (so your output will be identical to your input, voltage-wise). Buffer amplifiers are used commonly due to having a very high input impedance. This means that loading effects (external factors that your circuit has to deal with) like large currents that could mess with your circuit otherwise, are avoided. A buffer amplifier is often used as the first stage of a circuit because it effectively isolates your circuit from loading effects.
What are the effects of metal impurities in iron?
Metal impurities can have many different effects on iron. Some of these effects may include, but are not limited to differences in strength, chemical inertness, and flexibility.
What are the effects of electric current?
current has five effects. 1. physical effects 2. xray effects 3. heating effects 4. chemical effects 5.magnetic effects.
How might knowing about the inputs and outputs and side effects or errors produced within a system or device help you fix the device?
The question seems to most clearly be rephrased as "How does a device's output depend on it's input, and how can I troubleshoot it?". As an EE, I can best answer from a generalized electronic approach. In general, electronic systems consist of an input, some "box", and an output. For the output to be correct, the "box" must know what the error is between it's input, and it's expected output. Though there are several methods, the most basic one is termed "negative feedback". The concept is simple. An input is applied, the "box" does it's thing, and supplies the output. But how does the "box" know it's "right"? In general, the box must react to it's input and quickly produce an output, but how? Using negative feedback means using a basic addition system where that system compares the input to the "box" to it's output. For a system to be stable (and the theory is beyond this question), this feedback consists of adding a negative version of the output back into, and added to the input. Any difference is the error and is used to modify the output. If this is hard to visualize, think of it like this: A camera sees a dark area and decides to flash a bright light. But it does not know how the light will reflect. So before the camera takes the picture, it measures how much light comes back and subtracts that from what it originally flashed. Now the subtraction of what it put out vs. what it sees (negative feedback) shows what the "error" or correction is required. Knowing the difference allows the rest of the processing know how it needs to adjust so that what "what went in" = "what needs to come out". Now, how to fix a device? Well, it might not be apparent, but this stabilizing system of negative feedback can make it very difficult to diagnose a device or system. Fundamentally, it gets in the way while you try to see what's wrong, It is there altering the behavior of the "box" as it is malfunctioning, trying to make things right. So the basic answer is that, in order to fix a device, you have to first know what the input and output characteristics are, WITHOUT feedback. Then, to SEE that characteristic, the feedback somehow, must be removed, or accounted for so that it's effect can be eliminated from the "output = input x something" characteristic. This can be a difficult job within any system. I myself have struggled in attempts to separate "what's wrong" with the correcting effects of feedback trying in vain, to fix an erroneous output. Knowing the fundamental device's input and output, plus the "correcting or side effects" of feedback, will help you fix the device.
How the noise is overcome with the help of positive feedback amplifier?
A: With positive feedback the amplifier is saturated one way or the other in a quiescent state no signal or noise input can effects its output
Explain how negative feedback in an amplifier helps in reducing the distortion?
A: An amplifier operates withing its open loop response a negative feedback insure that the amplifier remains in its linear region. therefore reducing effects of saturation, storage time to name a few.
How do you minimize feedback on tons of effects plugged into an amp?
Get a noise gate. or turn down the volume level on your distortion. or turn down the regeneration on your delay or stand farther away from your amp or turn your amp down. feedback is because your guitar pickup is looping the sound coming out of the amplifier back through all your effects again then through the amplifier then back through your pickups and so on
What is effect of an unbypassed resistor on the common emitter amplifier circuit?
An emitter resistor in a common emitter circuit will cause the stage to experience the effects of degenerative feedback if it is unbypassed. The degenerative feedback reduces gain. This is probably the primary effect in the described circuit.
What does an electric guitar do?
its a solid body guitar that allows you to amplify and apply different effects to the sound by means of an amplifier.
What type of feedback exaggerates the effects of variations from normal?
posistive feedback
How has the guitar pedals assisted with technology of the guitar and sound quality?
Guitar effect pedals were invented in the late 60's and more development into effects came in the 70's. The purpose of the effect pedal, namely the ever popular distortion, overdrive, feedback and delay pedals, was to eliminate the need to crack amplifier tubes and overdriving the feedback by proximity to the amplifier. Later, flanger, phaser and Hendrix's heavy use of the Wah-Wah effect became increasingly popular through sound shaping and dynamics. Most pedals are used do avoid amplifier and instrument abuse and damage. The sound dynamics from a pedal is designed to give the guitar the best effect based on varying conditions; loudness, regular amplifier distortion and feedback, the general acoustics of the venue, the amplifier cabinet type... the possibilities are limitless.
What are the effects of feedback on stability and sensitivity?
Context?
Where are Effects greater than their cause?
In systems with positive feedback (or multiplier effects).
How shall you connect pedal effects to a fender amplifier with send in send out jacks?
The send out of the amp to the in of the effects, the out of the effects to the send in of the amp.
How do you Fix guitar feedback?
Feedback is caused when the sound waves emitted by an amplifier react with the strings and pickups on the guitar, causing the strings to vibrate and creating an effect similar to when you play harmonics. There is no simple solution to this problem, but here a few: 1.) Excessive gain and volume are the most common sources of harmonic feedback. Usually, you can fix this by simply changing the position of your body or the guitar so the strings aren't being affected by the standard hum from your amplifier's speakers. You can also simply turn your volume or gain levels down. Sometimes it doesn't take more than half a notch to cut the feedback. 2.) Another fix to this is to add a noise gate pedal to your effects chain. You can adjust the threshold of the gate to cut out the amp's hum and feedback when you are not playing. This takes some trial and error to get right, because if the threshold is too high, you will lose sustain. 3.) Sometimes having too many effects in your chain can cause feedback, in which case the noise gate is a good solution. You might also try experimenting with using your feedback musically. By adjusting your body or the way you hold your guitar, you can get different tones that may actually add sonic texture you more experimental guitar playing. Jimi Hendrix did a lot with these kinds of techniques.
What channels does an amplifier usually have?
An amplifier usually has 4 channels. A, B, C, and D. A and B are used for effects in clean. C and D are used for sounds and effect changes in dirty.
