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Questions tagged [voltage-source]

Anything related to voltage sources, their circuit models and their practical circuit implementations. An ideal voltage source is a two terminal device whose output is a voltage signal with a given waveform regardless of its load, i.e. irrespective of the circuit to which is connected.

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48 views

Select between two sources with transistors

I'm sorry if this has been asked before but I can't find useful data on this matter. I have two sources of data and I want to select one of them using transistors. If I had to guess I'd make the ...
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1answer
36 views

Voltage in a Y-Δ transform

I'm looking for a way to solve the following circuit Without the voltage sources on the circuit, I would be using a simple Y-Δ transform. But I'm not sure how I should proceed with them on. Which ...
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31 views

Source voltage of circuit with diodes when output voltage is given

Tried solving this using KVL, and solving to get the currents for the different parts of the circuit, however got stuck when trying to compute the source voltage especially that I'm unsure if the ...
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1answer
52 views

Understanding some mistakes, when trying to find the Thevenin equivalent

I was asked to find the Thevenin-Norton equivelant, and I got stuck on some things that I can't quite understand. I don't know if i need to be more specific. What's wrong with the following? And why ...
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33 views

Network Analysis for finding power delivered

We need to find the power delivered by the 5V source in the above network. I usually apply superposition theorem when I need to find the power delivered by a source when there are many power sources ...
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1answer
64 views

What is an example of a three-terminal current-controlled voltage source?

Dependent sources come in four flavors: voltage-dependent current sources (e.g. a FET can act as a VCCS) current-dependent current sources (BJT) voltage-dependent voltage sources (OpAmp as an example ...
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86 views

Combining two ideal voltage sources with an impedance between them

Solving a problem, I came across the following source transformation:        My question is: I know that I can do the following:       &...
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1answer
66 views

Source transformation with impedance being inductor or capacitor

I found a presentation that states the following about source transformation when the impedance is capacitive/inductive: While electrical circuits books, like Nilsson's, says: If I transform the ...
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1answer
69 views

Measuring change in magnitude of electric current due to change in conducting material characteristics

I posted this in the physics section. I now think this might be more appropriate section for these questions. I am looking for answers to the following: What is the order of magnitude of change in ...
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1answer
46 views

Calculating current in one branch of circuit

I want to calculate the current labeled in the diagram \$i\$. I am thinking that since there is 3V it would be as straightforward as \$\frac{3V}{6\Omega}\$ for the current in that branch labeled. Is ...
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1answer
32 views

Why do we need a minimum voltage here?

Let's assume we have a circuit like this: (Us should be monopolar but I didn't find something like that). simulate this circuit – Schematic created using CircuitLab Negative half wave: D2 is ...
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39 views

Is it a bad idea to connect two Li-ion batteries in parallel? [duplicate]

Suppose I have two Li-ion batteries for smartphones. One could say that if they are connected in parallel, then the voltage given to the device would be the same, but the capacity would be doubled, ...
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65 views

Electrical energy saving [closed]

"You can not pay for the light! This CUTE for years was..." I wonder, what will happen if to do what is illustrated on the picture. I think there are two cases: Hot terminal of left outlet connect ...
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1answer
106 views

Voltage of Different Voltage Sources in Parallel with Diodes

I am working on a project in which I will have two different power sources, which I will have to dynamically switch between to supply power to devices. These two power sources will likely be similar ...
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34 views

Behavior of an ECU Digital Output (0-24V) to another ECU (pull-up i guess) input

Recently i had to control a functionality of an ECU using a separate system (another ECU). ECU "A" provides an input pin which if measured in open circuit shows 12V, so i guess it is a pull-up input. ...
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1answer
69 views

Current when two batteries (voltage sources) of different potentials are in a circuit

What will happen when I connect two batteries of different potential in a circuit like below? And if there will be a current will it be the same in the whole circuit? How is it possible since ...
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3answers
129 views

Logic circuits use current source or voltage source?

Main question: Do logic circuits use a current source or a voltage source? My assumption is that they use current sources because the standard is to use voltage as the indicator of input and output ...
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1answer
72 views

What are the operational differences between a battery and a plug-in voltage supply?

I have a neat little circuit with which I am powering an electromagnet. Below is the schematic for the PCB I created. The positive lead of the electromagnet is connected to 12vdc and the negative lead ...
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54 views

Li-ion battery and arduinos custom circuitry

So i have to design a board around a dialog SOC (DA14681). The dialog part supports li-ion batteries, it has a charger and fuel gauge and USB detection (to power device in case both usb and dc ...
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1answer
62 views

Powering 12V / 5W device at minimum cost and steady life duration

I want to power one particular device that feeds of 12V (5W) electricity. However this device is intended to be highly portable and as such, I am quite tight on space, which means 12V accumulators ...
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1answer
215 views

What will happen if a dependent voltage source in parallel with a dependent current source?

What will happen if a dependent voltage source in parallel with a dependent current source. like dependent voltage source: 4Vx and current source 3Ix in parallel.
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1answer
23 views

variable regulation source

I am learning electronics and I want to make a , variable regulation source for a soldering iron, which works at 50W, how much voltage and amps should have the output? For the soldering iron works ...
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1answer
49 views

Nodal analysis: how can I represent the current i2 in terms of voltage over R2?

I am doing the nodal analysis of this circuit: I have successfully wrote the current equations for node A, using nodal analysis, that I found it to be: ...
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2answers
61 views

How to amplify the output of an on NMOS, connected to zero source voltage?

I am simulating a 3 transistor based XNOR cell using HSPICE. The circuit is shown in the picture. technology = 45nm Vdd=1.1v |Vth|=0.62v In the case of A=1 and B=1, the output is charged through ...
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0answers
63 views

generate pulse voltage source with phase shift

I am trying to simulate a differential per-driver stage for a laser driver in ADS. i want to use pulse signal to the input, but the voltage source doesnt give the option to change phase like AC ...
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31 views

AC regime: Parallel connection of ideal current generator and short circuit and Parallel connection of ideal voltage source and short circuit

I have the following two scenarios in the AC regime: Parallel connection of ideal current generator and short circuit Parallel connection of ideal voltage source and short circuit In the first ...
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1answer
29 views

AC regime: Serial connection of ideal current generator and impedance and Parallel connection of ideal voltage source and impedance

I have the following two scenarios in the AC regime: Serial connection of ideal current generator and impedance Parallel connection of ideal voltage source and impedance When we have the first ...
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3answers
646 views

How Would One Analyze a Circuit with Two Voltage Sources?

I'm studying Circuit Analysis and a sample problem is as follows: I'm not really sure how to approach the problem. My intuition leads me to believe that the two voltage sources are acting against one ...
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2answers
78 views

How much current and voltage should be flowing back into my battery?

I am very new to electrical engineering, and one thing that has been bugging me is short circuits. Main question: When I have a circuit, how much current and voltage should be flowing back to my ...
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48 views

Charging capacitors with voltage source providing random voltage?

Say I have a voltage source whose output is a function that varies with time. This function is random, but the general shape of the function is that it sharply increases at first and slowly dies off ...
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4answers
189 views

Simple way to boost from 24V to 24.8V? (up to 10A) [closed]

Do you know a simple, inexpensive, elegant way of boosting 24V up by just 0.8V, to 24.8V (between 24.5V and 25V)? My current goal is to power LED appliances but my question is not specificaly related ...
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1answer
315 views

Convert Current source to Voltage source in Laplace domain

Is it possible, once I've converted the circuit diagram into its Laplace equivalent, to replace a current source which is in parallel with, in this case, a resistor and inductor by the usual V=IR ...
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1answer
47 views

Back up 9V battery when circuit is unplugged from AC

I have to work on a circuit that basically goes like this. I have two voltage sources, a 9V battery and AC. The AC is the main source, however, when this is unplugged, the 9V battery must come to the ...
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3answers
6k views

LTspice dependent voltage sources circuit

I am trying to add dependent voltage sources in LTSpice, but I need to make a voltage dependent source whose voltage depends on the average of two voltages. How can I build that in LTspice? The ...
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31 views

Incompatible association

I know that operational amplifiers have a stage in which there is an incompatible association (VCCS + VCVS). How do I show that this configuration gives an infinite gain? I am considering general two ...
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1answer
52 views

current in resistor in series with voltage and current sources?

What would be the current in the 3 ohm resistor next to 45v source? Im not sure if it should be 45/3 or 5 amps!
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1answer
62 views

6VDC power sources for momentary switch

I recently asked this question where I'm trying to wire up this momentary switch to my Raspberry Pi 1 Model A such that: The switch is normally open; and When pushed down: it closes the circuit, ...
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2answers
197 views

current dependent voltage source problem

Hey, I am studying dependent sources.as an exercise i am trying to solve the circuit in the image. i have been banging my head against the wall on this problem and i really want some help. please. I ...
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4answers
121 views

Connecting an LED to a “incompatible” voltage source

I'm band new to electricity and electronics and am confused by something I saw with a recent video that explains how to connect a battery, LED and resistor together. In that article (see link for ...
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1answer
168 views

Dependent or independent sources of voltage and current

I am confused with this term of dependent and independent . What exactly this mean .does dependent sources mean that if we connect a dependent source of voltage and current in same circuit ,they will ...
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1answer
52 views

How to power several gate drivers with as few power supplies as possible?

I am designing a 3-phase three-level NPC converter (same type as: https://trinhquocnam.files.wordpress.com/2015/12/t-npc.png?w=767&h=434). The box this converter will be placed into is fed with ...
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1answer
132 views

Phase voltage from unbalancd line voltages symmetrical components

I'm trying to calculate the phase voltage of a given unbalanced sources star connected from the given line voltages. I'm trying to employ symmetrical component synthesis to find a solution. I know ...
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3answers
241 views

Connecting Two Analog Sources to One Analog Sink

Q: Connecting Two Analog Sources to One Analog Sink without the sources effecting one other What I want to do: I basically want to add a radio tuner/MP3 player in a car. Now, that car already has a ...
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3answers
204 views

Can I use a transimpedance amplifier using current through a resistor?

I'm designing a lab exercise for 1st year circuits students. They learn about current controlled voltage sources, but we never show them one. I know that transimpedance amplifiers are used for this ...
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3answers
585 views

GND of 9V batteries in a circuit

I have a very simple question. I'm building a circuit that uses some integrated circuits, some of them need 5V and GND, and some like opamps need symmetrical power supply. In summary, I will need 3 ...
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2answers
315 views

Build a voltage-controlled voltage source out of discrete components

I'm in a bit of a pickle. I need to build a voltage-controlled voltage source, but I don't have any opamps (or time to order them). I have been working for several hours trying to simulate a circuit ...
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0answers
295 views

Voltage-Controlled Voltage Sources (VCVS) and high voltage gain

I'm trying to solve a problem from my Electric Circuits class which involves a VCVS with a voltage gain of 10^6 times the original voltage of the resistor R2. The goal is to find the voltage displayed ...
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3answers
38 views

How do I determine this node voltage?

I'm wondering why the node voltage of C will equal to Vc = Vd + 770 I've done research but have no clue. Any help will be appreciated.
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2answers
4k views

Ideal Voltage and Current Sources in series

For the circuit below determine a) the current I, b) the voltage \$ V_R \$ and c) the voltage \$ V_o \$ across the current source Note: VR should be V subscript R and the case is the ...
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1answer
67 views

Help Identifying a Voltage Regulator 0 - 5 Volt?

So this voltage regulator came from a variable resistor for my 06 Infinity QX56 AC blower motor. I have already replaced the unit with a new one but figured I would try to fix this and have a spare. ...