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Questions tagged [voltage]

Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

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How is the energy consumption of a ciruit component calculated?

I know that watts are equal to amps times volts, and that watts are a rate of energy consumtion. I have looked at some circuits, but I am unsure of how the total energy use is being distributed. My ...
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41 views

I2C pullups for level shifting

If I want a breakout with two sensors on it, one operating at my MCU's voltage (3.3V) and the other requires a drop to 1.8V, do I need two sets of pullup resistors for both voltage lines? Can I do ...
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114 views

Finding total energy for RC discharged capacitor at t = ∞?

Most Rc circuits are not as severely difficult as this kind of circuit. I'm trying to solve for both the time constant and the voltage V2 across the R2 resistor, both of which will hold the necessary ...
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RL Circuit Analysis with 2 sources, how to find current of resistor?

I've been tackling some problems related to natural and step responses for RL & RC circuits, but I think I've hit a major roadblock for this RL circuit. I'm trying to find the time constant and ...
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33 views

IEC 60320 C13/C14 Voltage Rating

According to the standard, C13/C14 plugs don't have a set voltage (unlike something like a L6-20P), so it is up to the consumer/manufacturer to decide which voltages are appropriate. I recently ...
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33 views

Is there a limit for voltage a PM generator gets to based on RPMs?

I build different small PM handcrank generators for fun, Recently I built a single phase generator and printed myself a couple transmissions. Now as far as I know 3 things affect voltage, speed of ...
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64 views

Can you get values of the components in the circuit?

I have a mosquito repellent circuit diagram (voltage doubler) with printed values. Can anybody find the actual component value of the capacitors?
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62 views

Ideal Transformer Theory Question

I have some questions regarding ideal transformers, similar to the one seen below: When talking about 'ideal transformers', can I calculate the current on the primary side by finding the complex ...
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44 views

Wanting to power small audio amp toy with usb power bank

It uses 3 AA batteries but I'm looking to determine if I can either just use the usb 5v or find a plug & play method to adjust the voltage down half a volt. I say plug and play because while I'm ...
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What is “Vop” sensitivity unit?

I am studying the datasheet of an ultrasonic transducer (Murata MA58MF14). I understand the maximum input voltage unit (voltage peak-to-peak), but I do not understand what exactly the sensitivity unit ...
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63 views

What happens when devices request different voltages from a USB hub? [duplicate]

I'd like to charge two devices with one USB charger, one requests 5V, the other 9V. I plug an USB hub (potentially an old USB 2.0 one) in the (9V capable) charger and plug the two devices in the hub. ...
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78 views

Designing voltage to current converter 4-20 mA [closed]

I'm currently designing (or at least trying to) a RTD amplifier with ICL and current outputs. What I've got so far is a working RTD and ICL schemes, but I still struggle to design a proper converter....
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MOSFET: What is considered “large voltage” when finding early voltage via experimental method?

I have found that to get early voltage you can take the tangent a I vs V MOSFET characteristic graph at "large voltages" and wherever the lines intercept the negative x-axis is the early voltage (see ...
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34 views

Replacing Electrical System with a Gain?

I have a system containing both a mechanical and an electrical part, as shown in the block diagram below. I am interested in simplifying this block diagram by eliminating the electrical part and ...
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1answer
22 views

Get negative control voltage for a AS3310 chip

I'm trying to use a AS3310 chip to generate an envelope from a trigger/gate signal. The AS3310 expects for the ADR (attack/decay/release) control voltage 0 to -5V - for the S (Sustain) 0 to +5V I ...
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Battery OCV measurement

I want to measure battery voltage using OCV (open circuit method) method. I want to make a look-up table, so, I have come up with a block diagram for OCV measurement at battery relaxed state. Will it ...
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42 views

PSPICE simulation of capacitor voltage and current disagrees with math

I'm testing a simple enough circuit on PSPICE. The zener has a BV = 220V, so the capacitor has a voltage of 220V until the switch closes. Using the time equation for voltage of a capacitor: Vc(t) = ...
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65 views

LED light cycles on and off - Is it a heat or voltage problem?

I have this LED light that was over the aquarium at my work desk. There's a circuit board (not pictured) that controls when the lights go on and off but, after a power outage a few weeks ago, it seems ...
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115 views

How to measure battery voltage while it's used?

I have an Arduino which is being powered by a battery. I would like to monitor the charge level of this battery. Normally, this is very easy, just check the voltage across the disconnected battery's + ...
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51 views

Check for 12V with Arduino (Two resistors and a diode)

I need to read the presence of 12V on one of the lines of the board. I want to read using Arduino UNO. I found the following scheme: Is this scheme correct?
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2answers
173 views

Why sometimes some PCB designer add extra traces to connect two pin to each other?

I've checked a PCB board which has designed by very famous company and I saw something weird.They connected two pin to each other 2 times and from the top and the bottom of the board I am going to ...
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911 views

What are the limiting factors of these op-amps?

I designed a multiple feedback band pass filter ...
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43 views

Total curent through two parallel resistors

voltage source- 5V This simulator shows that the curent in the left wire will be 10A, like sum of curents through two parallel resistors. Is it wrong?
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42 views

C-W Multiplier Unipolar Input

I was seeing some circuits for a Cockroft-Walton multiplier.Most of them seem to be using an AC input voltage.My specific query is ,would this multiplier work with a uni-polar (pulsed DC) input. For ...
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Operating Voltage Range Question

Almost certainly a neophyte question. I'm trying to understand the difference between nominal voltage and operation voltage range. My intuition was that, for a given power supply, it would hold a ...
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64 views

Comparing Responses for Linear and Non-Linear System in Simulink

I am going through and reviewing this unprofessional (I highlight a potential mistake in Section3.4) paper: Nonlinear Model & Controller Design for Magnetic Levitation System Specifically, I am ...
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36 views

3 phase voltage problem when connecting to servo

I have 380V 3 phase with the following line to neutral voltages: L1: 238V, L2: 234V, L3: 224V. The system has a single phase servo driver that takes in L3 and N, however when hooked up L1, L2, and L3, ...
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how do i get the missing voltage source?

how do i proceed to get the missing voltage source(Vdc)? i tried solving it using the superposition principle by calculating io resulting from the 230V source then the io resulting from the 115V. and ...
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50 views

Appearing voltage when connecting different grounds

We have designed instrumentation equipment. When several instrumentation units are connected their grounds must be connected. The first proposal was to connect the GNDs by cascade topology. But we ...
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2answers
137 views

Differential Opamp Strange Behavior

I have no answer for this strange opamp behavior. The circuit shown is from a typical nonisolated ,Non grid-tie inverter product (imagine H bridge Inverter). which has a common -ve high power circuit ...
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83 views

Can i use an AC 15A 250V / 30A 125V rocker in place of a 15A 125V / 10A 250V one?

Amazon sent me the wrong replacement switch so i am wondering if i can use it? Original switch is AC 15A 125V / 10A 250V new one is AC 15A 250V / 30A 125V can i use it without damaging the ...
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203 views

Mistake in published paper about magnetic levitation?

As I was reading through this paper: Nonlinear Model & Controller Design for Magnetic Levitation System, I stumbled cross section 3.3 which I could not follow. Summarizing section 3.3 Non Linear ...
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Problem understanding an exercise regarding impulsions

So, I'm having quite some trouble understanding and solving the following exercise. We're given the following montage We are told that the following square signal (called Vin) is applied Now, we ...
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2answers
135 views

Two potentiometers to control the range limits of a voltage source

I would like to control the range of an input voltage source using two potentiometers to establish the limits of the signal. First pot determines limit 1 and second pot determines limit 2. Lets say, ...
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117 views

What are some of the reasons for voltage spikes in voltage regulated DC circuits?

Decoupling capacitors are often used to protect ICs against voltage spikes even in circuits that contain voltage regulation of some sort (even something as simple as a zener shunt) What causes ...
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98 views

Inverting, single-supply comparator not working as expected

I am trying to convert an input sine wave to a square wave. The sine wave is centered at 2.5V and has an amplitude of 2V, with a frequency of 100kHz. I am looking for a hysteresis of 100mV centered ...
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84 views

Average Inductor Voltage equals Zero?

Okay I already read this post which answers the question mathematically here, at the end of the top answer the poster said: "Thus, the only way to keep current from going to infinity is the ...
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2answers
90 views

Software controlled variable voltage AC supply with SSR relays

I have an autotransformer like this one : I would like to control it with an arduino solid state relay like this one: What would happens if I wire every output of the transformer together to the ...
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2answers
96 views

What exactly exactly is the difference between rms and average voltage value [duplicate]

I hear that rms is the ac value which would produce the same heat effect as a dc value... but I don't understand why this rms is different from average value. I also read that the average value of an ...
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33 views

Voltage Matching with Thermistor

I am working on a circuit for a science competition, and one of the tasks is cooling a thing of water to a certain temperature (we are doing about 25C to 18C) and then using that to trigger a circuit. ...
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High current low voltage MOSFET help

I am wondering if I have a 75 amp @7.4v source, obviously it's gonna be hard to find a switch with a 12 mm thread to handle that power, so I would obviously need some kind of MOSFET. My question is, ...
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How do we get the negative voltage input value of this Op-Amp?

This is an exercise we did in class about the linear limitations of an Op-Amp, I get how we get the conductance and the Current value. But I don't understand in this KVL how did we get the value of $$...
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40 views

Measuring voltage on an Arduino pin, while powered from USB, with separate grounds

I have Arduino Uno connected to a computer with a USB cable. Then I have a DC circuit, powered by a wall adapter. In this circuit, I have a shunt resistor (connected in series after the load) and I ...
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1answer
35 views

Rising edge to Pulse Voltage

Im basically entirely new to Electrical Engineering, however I really want to challenge myself to become a better one, so I decided to try to mod a nerf gun to be a coil gun, more or less. Now, I know ...
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2answers
60 views

Cap maximum wall outlet voltage

I live in a rural area. A problem occured when my UPS could not run my computer simply because of voltage fluctuations. I have tried many stabilizers but its too rapid that it would make a tick and ...
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2answers
46 views

LTSpice Error: timestep too small

This is the error I see: This is my Simulation Command. What is the issue here?
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4answers
85 views

Basic nodal analysis question

I have a question about node analysis method. The part I could not solve is the Node c's equation. In equations, C is represented by 3.Here is my question what is G5(i=GV) in the circuit. The empty ...
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3answers
66 views

Deenergizing Inductor

I am reading through "Practical Electronics for Inventors" and I came upon a chapter about deenergizing inductor. I understand the concept that when you cut the current going into inductor, it will ...
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2answers
142 views

Powering 30m of RGB LED strips?

I'm currently interested in following this tutorial which explains how to create a homebridge (ESP8266) controlled 12v RGB strip which is exactly what I've been looking for. However, whilst I do ...
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6answers
163 views

Converting 0-5 volts (linear) to +2.5 — 0 — +2.5 volts (“vee”)

I'm trying to find a simple way to convert a 0-5 V output from a joystick hall effect sensor to +2.5 -- 0 -- +2.5 V. Here's how I want the response to look: The output voltage will be sent to a ...