What are the disadvantages of negative feedback in electronics?

What are the disadvantages of positive feedback in electronics?

I've been experimenting with it lately and can't understand its usefulness, as in, why is it even used?

I don't mean a circuit with op amps and capacitors for example. What I mean is, it seems (just looking at examples) that circuits using positive feedback in electronics are basically pointless because they require huge amount of input power. For example, how would an emitter follower circuit work with a single transistor if the feedback was positive? It seems like you'd need another transistor inside to drive it.

Or is it just so we can build oscillators that have very high frequency control over the waveshape? Thanks! In addition to what you say here, the following is part of answer by someone else here: Quote: The positive feedback has at least one advantage in a practical circuit. The feedback path provides a resistance, which can reduce heating in circuits with large transistors. Without the feedback, there would be essentially no way to prevent too much current through the collector-base junction of the transistor. The base current could be as high as the collector current, and the transistor would soon become damaged.

Also, some types of active circuits (eg, amplifiers, modulators, filters, oscillators) need to be designed to have positive feedback. If there were no resistance in the feedback path, then negative feedback would be needed to achieve the same effect. As a side note, negative feedback is needed for stability.

If negative feedback is used, then the input is connected to ground, not the negative rail. There is no problem driving a current-source op amp from a high voltage supply or from an inductor; the op amp drives the signal to ground. Since the input is always driving the op amp's output to ground, there is no current flowing in the input section.

It is possible to use op amps without feedback, such as op amps made specifically for the purpose of audio playback. It is always necessary to study a book to learn the rules of correct science. Following the rules will guarantee you the correct answer. Rulons are no exception.

This is true.

What are the advantages and disadvantages of feedback?

Is it useful or does it cause you harm?

Does it have any uses other than as a tool in coaching? The following is a general review of feedback. It's my opinion that there is no need for it; in fact, one of the reasons that coaches say they don't need it is because they have never been taught to use it well. In my work with athletes I have seen the effects that using feedback well can have.

Advantages of feedback. Feedback can be seen as a means of communicating about what has happened or what is going to happen. It can be a way of acknowledging and validating how the coach and the athlete relate to each other. The athlete is encouraged to reflect on his/her actions and thoughts and ask questions of themselves about them. If the athlete uses the feedback constructively, s/he can feel empowered and grow in self-knowledge. Disadvantages of feedback. It is usually too narrow. A coach may only see the errors of the athlete that affect a particular part of the technical-tactical element of the game.

It is mostly a verbal system of communicating meaning that can often leave the player feeling dissatisfied or offended. It can be a tool of power rather than one of empowerment. It is sometimes difficult for the coach to control the feedback (or the athlete). Feedback can be dangerous, because, for example, the coach may unwittingly give too much information about their future actions. Feedback can be used to create a conflict between the coach and the athlete if it is used as a means of criticizing an action. How should a coach use feedback? Feedback should be used with caution and at the appropriate time in the learning process. It is more valuable when the coach gives the information to the athlete than the athlete to the coach. The coach must decide what to say and what not to say. If the athlete chooses what not to say, there is a danger that it may be misinterpreted. The information should be presented in a positive manner so that the athlete feels accepted, respected and empowered. If the information is not presented positively it can be taken as criticism and the athlete may react badly or defensively.

What are the advantages of positive and negative feedback in electronics?

This is a very broad question, and I'm not sure what you mean by positive and negative feedback.

Feedback is a mechanism that can amplify or attenuate a signal. It's used for various purposes, but one common application is the use of audio amplifiers to drive speakers. The amplifier will amplify the signal (attenuating it if necessary) and then send the amplified signal to the speaker. This creates a "sound wave" that is reflected back and forth between the amplifier and the speaker. The result is that the original signal gets amplified (or attenuated if the amplifier needs to be turned down) as many times as there are reflections. This is called positive feedback.

A related mechanism is negative feedback. Instead of amplifying the signal, the amplifier subtracts an amount from the signal and sends that amount back to the input. The net result is the same as positive feedback, but with a negative sign.

In electronics, positive feedback is used in a number of ways. For example, when using a speaker and an amplifier, the speaker is usually wired to ground and the amplifier is wired to a power supply that has a positive voltage relative to ground. This means that the speaker is wired to ground, which makes the amplifier drive the speaker positive relative to ground. This will cause the speaker to make a sound wave that is reflected back and forth between the speaker and ground. The result is that the speaker is driven positive relative to ground, which causes it to make another sound wave that is reflected back and forth between the speaker and ground. This is positive feedback.

Another use of positive feedback is in the audio amplifier driving the speakers. This is done to prevent the speakers from distorting or even causing oscillation. When the amplifier amplifies the signal, it does so to the power supply and then sends that amplified signal to the speaker. This causes a sound wave to be reflected back and forth between the amplifier and the speakers. The result is that the amplifier receives a positive voltage and sends that voltage to the speaker. The speaker receives the voltage and creates a positive sound wave that is reflected back and forth between the speaker and the amplifier. The amplifier is effectively pulling itself up by its own bootstraps, preventing distortion.

It should be noted that positive feedback doesn't have to be positive.

What are the disadvantages of negative feedback in electronics?

The disadvantage is that negative feedback often requires a resistor.

When you look at the circuit as it applies to a light bulb, a big, strong resistor with a fairly low voltage across it is used to give the circuit a nice slow response to a change in current.

Negative feedback has two major disadvantages: First of all, the signal itself may become "clipped" when the signal is near the cutoff voltage or the maximum limit of the op amp. Also, some op amps require a relatively large resistor to provide a negative feedback loop, which in turn makes the op amp less ideal for many applications.

The second major disadvantage is that negative feedback generally requires a larger op amp than positive feedback because the negative feedback loop can affect the output by changing its own gain. Thus, if your requirement is to achieve better performance from a smaller op amp, then positive feedback is better.