# Questions tagged [summer]

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### Diodes circuit analysis problem and voltage calculation

I'm learning about diodes. In one of problems which book has solved, it says Vo=((Vi-2)/2) +2 when both diodes are off. I can't understand why we have "+2" here. My calculation of Vo is ...
475 views

### In a negative feedback loop, why does increase in v_out lead to increase in v-?

I hope this is the right place to ask this question. (Please let me know if there's a better place to ask this.) Basically, I'm quite confused about how we check if we have a negative feedback loop. ...
138 views

### Which is the input resistance of the second amplifier?

If a apply a positive Vs, then D2 is blocked and D1 is working, right? How do I calculate Vo then? I know the formula is: - (input resistance / negative feedback resistor) * Vs, but I don't know which ...
727 views

### Universal (magic) Op-Amp Fundamentals

In a recent lecture in my AC Circuits course, the professor put this slide up and hastily explained the Universal Op-Amp. Since I already struggle with circuits, let alone operational amplifiers, I ...
131 views

### Very basic circuit question

My problem is in the VA, VB parts is the previous circuit equivalent to this (OPTION A): Or to this (OPTION B):
96 views

### Problem with summer in VHDL

I'm trying to do a summer in VHDL, but when I try simulate, appear an error. The code: ...
38 views

### Help in analysing circuit to show which resistor controls the differential gain

I understand the circuit to be a summing circuit but I am struggling to analyse past this point: Vout = R5 (((-R2/R1 * V2)/R4) * (V1 / R3)). can anyone analyse this further to prove that R5 is the ...
109 views

### Summarising from a group of sensors

I have a group of sensors the nominally output 2.5V but if they come in contact with a magnet they'll increase slightly or decrease slightly based on the polarity (north/south pole). These sensors ...