Problem with Electronic Feedback?

AI Thread Summary
The discussion focuses on the differences between positive and negative feedback in inverting and non-inverting operational amplifiers (op-amps). It clarifies that positive feedback is rarely used in amplifiers, primarily serving functions like comparators and oscillators. When the non-inverting input exceeds the inverting input, the op-amp outputs the positive supply voltage, while the opposite condition leads to a negative output. The conversation emphasizes that formulas for voltage output will differ based on the type of feedback used. Understanding these feedback mechanisms is crucial for effective op-amp circuit design.
gunblaze
Messages
187
Reaction score
0
Hi, i was reading through the topic on analogue electronics. And every single example on my text seems to just be just on the negative feedback on both the inverting and non-inverting input of an op-amp. What i would like to know is what's the difference between positive and negative feedback on an inverting and non-inverting op-amp. Will there be any changes in the formula to find the Voltage ouput of the op-amp?
 
Physics news on Phys.org
You can't use positive feedback on inverting and non-inverting amplifiers. Positive feedback is hardly ever used, but the most common use of it would be for a comparator. When the non-inverting input is at a higher voltage than the inverting input, the op amp will be positively saturated and put out the positive supply voltage. When the non-inverting input drops below the inverting input, the op-amp hits the other (negative) rail. Also, oscillators can be made with positive feedback.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

How does the negative feedback amplifier below work?
Replies
7
Views
1K
Engineering Why is the voltage source high potential into node 1 at -12 V in this op amp problem?
Replies
15
Views
2K
Calculating Input Voltage for Switched Op-Amp Circuit
Replies
7
Views
1K
Op-amp Oscillator Circuit Design (10-50 MHz)
Replies
6
Views
3K
Engineering Practical design of an inverting Schmitt trigger with noise tolerance
Replies
21
Views
3K
I Understanding Op-Amp negative feedback
Replies
18
Views
4K
Any advice to make this Op-Amp temperature controller circuit work?
Replies
34
Views
4K
How Do Op Amps Respond to Inverting and Non-Inverting Inputs?
Replies
12
Views
2K
Engineering Calculating the unknown voltages in ideal op-amp circuits
Replies
13
Views
2K
Engineering Differential amplifier confusion (BJTs + Operational Amp)
2
Replies
59
Views
4K

Hot Threads

Recent Insights

Back
Top