# Questions tagged [high-current]

Say how much current is required, high-current means different things to different people.

236 questions
144 views

### High current in Coil/Inductor

I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high ...
874 views

### what is the temperature equilibrium for a copper conductor conducting 4000 Amps

I have a copper conductor with a total resistance of 1 miliohm and a passing current of 4000 Amps. I want to know what the temperature equilibrium is for a conductor in the electrical grid (conductor ...
180 views

### High current plasma jet striking circuit

A little background: I'm a mechanical engineering graduate student with a focus in materials, so electrical engineering is not my core background. I'm conducting research on plasma surface treatment ...
648 views

### How can you calculate a railgun's exit velocity?

Having a cylindrical iron container with wall thickness of 20 cm, and a total weight of 50 tons when filled with its cargo, how would you be able to calculate its required voltage and current input in ...
123 views

### High Voltage Nodes creep-age and clearance standards for electronics?

I am trying to design with the NCV5183 with a 400V DC bus. I am trying to figure out the creepage/clearance standards i need to consider for high voltage layout and if the IC's pin to pin spacing is ...
93 views

### Power Supply for two 50V/12.5A Solenoids

I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
76 views

### 20A current measurement with hall effect sensor

I am not aware of drawing more than 1A over PCB traces. We are planning to use ACS712 hall effect current sensor linked below: https://www.amazon.in/KitsGuru-KG134-ACs712-Current-Arduino/dp/...
387 views

### OpAmp with high output current and capacitive load

I am trying to solve the following problem which - until today - I thought to be a trivial one: I have multiple reference voltages (from different sources) that I need to buffer and/or invert, filter ...
163 views

### Voltage Sucked Down on OPA541 (amplifier) Circuit Output

I am currently working on a design to generate a 5VAC (rms) @ 400Hz supply capable of 5A continuous. The design contains a non-inverting amplifier that takes a 213mV (rms) @ 400Hz voltage waveform (...
5k views

### How can the contact points of jumper cables handle the hundreds of amps required to start a car?

When jumpstarting a car, you connect those big alligator clamps to the terminals of the batteries. The cables themselves can handle the current just fine, but the contact points between the alligator ...
2k views

### What's inside power bank car jumper

All powerbanks that have car-jump function have some thingy between the clamps and powerbank socket: What's inside that thingy? The manufacturers typically claim 300A of starting current for ...
610 views

### How do I design a PCB for high current applications?

I'm attempting to design a PCB that will have 8 high-side drivers. I'm struggling with designing the PCB, because it seems the pad on the back of chip isn't large enough to carry the max current it is ...
57 views

### 12v 4.8Ah DC regulated to BOTH 5v with 1.9A and 5v 5A

I am in the process of designing a circuit. I am unsure how to design a regulator to power the system. I don't know of a way to be able to achieve what is shown in the diagram above. Looking online ...
264 views

### Why do I get high DC current in grid tied inverter output?

Edit: Added gating signal waveforms. Changed some of the graphs, I accidentally put a test circuit waveforms the first time. Current is not that high but offset is there and current is high for a ...
282 views

### PCB Current Draw vs Temperature Rise Interpretation and Question

I am using this tool for current calculation While changing the input parameters i realized Temperature Rise °C is affecting the current draw.(you might say OF COURSE!) At Ambient Temperature = 25°C ...
993 views

### Op-amps, why do they have such low output currents

An introduction to my question is that ultimately op-amps drive something with their output stage (i.e., they source or sink current). I am looking specifically at the current sourcing scenario for ...
247 views

### Power requirements, and feasibility for a short high power bursts (very fast heating application)

I would like some help to evaluate the electrical feasibility of a system to heat 35 gram of thermoplastic material (for active stiffness control) in 50 ms, by about 100 degrees Celsius. The material ...
33 views

### Current Boosting Techniques for Source Side

I'm trying to use a portable power bank (5V/2.1A) and try to supply power to my DC/DC Converter which will then be used to power something else (probably a laptop or so). However, the issue is that ...
228 views

### Why is this high amperage metal melter making an electric arc?

There is a video on youtube with a device for melting metal (video below). It's a step-down transformer that transforms 120VAC in primary coil to ~3VAC in secondary coil, therefore stepping up the ...
301 views

### Safety of current with duration [duplicate]

My question is about how dangerous a momentary amount of current is vs the duration. Like is there a reasonably consistent relationship between current duration through the body and relative danger? ...
657 views

### Is it safe to use narrow but short PCB traces for high current flow?

I am trying to design a PCB which has high current traces on it. PCB has 1 oz (35 um) trace thickness. Maximum current flow is going to be 12 Amps RMS. I found this online PCB thickness calculator: ...
80 views

### How much current would give a little shock [closed]

I just read on a website that 5mA is enough to give a little shock but I have touched 650mA and nothing happened. Does that mean that 650mA becomes too small when I touch it due to resistance of my ...
5k views

### High Voltage PWM Motor Controller - Mosfets Explode

I've searched every post for an answer to this problem. I've built a motor controller circuit as shown in this diagram. I made the diagram as accurate as possible. The diodes on the mosfets were ...
4k views

### Finding a faulty chip that draws too much current

Note that this is a theoretical question - there is no schematic I can show. I will show some schematic, but it will be a very simplified version of an actual circuit, only for illustration purposes. ...
348 views

### Do cheap triacs burn out more easily?

I built a stick welder using two microwave transformers and a DC bridge rectifier. To control the heat, I created a triac current regulator attached to the AC input of the transformers. I have used ...
2k views

### AC vs. DC in Low Speed, High Torque application

My club is building a 1/4 scale utility tractor (around 800 lbs) and for the past couple of years we have been using an electric hybrid drivetrain. Our system has been a 32 hp gas motor powering a DC ...
4k views

### Why are the 10A inputs on many multimeters unfused?

Most multimeters have a current measurement setting for low currents where a fuse is present. However, to measure high currents up to 10A, you need to use a second input that is often unfused. Now, I ...
55 views

### Device/method for handling rapidly changing current demand in DC source

A circuit in my project uses rapidly switching MOSFETs to control current flow, and as a side effect, the current demand on the DC source varies rapidly. The FET is switching at somewhere between ...
4k views

### Is there a downside to using multiple relays simultaneously to increase relay capacity

I want to install a relay to my fusebox which is controlling whole basement with machinery. Relays that I have have got 2A limit each, and I have 32 relays. Can I just use all of them for the same ...
1k views

### Simple variable current source for approx. 2A, constant load

I need a variable current source as part of a power supply for an experiment I'm building. This part should heat up a filament, so the load is pretty constant. Timing is not a factor either. So what I'...
158 views

### High Voltage & Current Circuit From Small Power Source

Is there any way that I can create a high voltage and current generator circuit from low power source such as lead acid battery? eg; 12V to 10 kV and 1A Most high voltage generator such as ZVS or ...
191 views

### Waterproof Fan Failing In A Chamber With 100% Relative Humidity

So I've built a aeroponic tower that uses an ultrasonic atomizer instead of spray nozzles. This approach is called "fogponics" across the hydroponic community. My Problem is that I have to run a fan ...
4k views

### LM317 based voltage regulated high current power supply problem

I am new to electronics and have been exploring easy to make DIY things for a while now. I am using the following circuit to make a voltage regulated high current DC power supply. The problem is, ...
77 views

### Which capacitors can deliver the highest amount of current in short bursts [closed]

Ultra capacitors can store a huge amount of charge but can it discharge the fastest? In other words I am looking for a capacitor with the lowest internal resistance,also it should be at least in the ...
831 views

### Safety when experimenting with large currents

I am experimenting with large currents from ultra capacitor discharge. For example with 500 A (at 2.8 V) you get a very impressive demonstration of the magnetic field of a straight conductor using ...
436 views

### 3 phase transformer to output 2 wires

Is there a way to connect transformers secondarys so that I get only two output wires and not three(It doesent mater if the wires aoutput 3 phases or 1 phase or some wierd signal). This is step down ...
439 views

### What terminals of bridge rectifier to use, if I want it to behave as a high-current diode?

I have a 12V power source that can deliver 25A (DC). I intend to use something around 15A .. 20A on a circuit that includes a diode. However, I can't find a diode that can handle that much current, ...
204 views

### Can I supply more current at lower voltage safely through a variac?

Here is my setup: I have a 120V 20A welder that I am fairly certain uses a transformer to drop the voltage which increases the amperage. I have a 120V 20A variac that I want to put in series on the ...
71 views

### Can a low current device be damaged by a high current device when in parallel?

Well, the title of this question tells it all, but repeat it here: "Can a low current device be damaged by a high current device when in parallel?" Came along this article: http://www.embedded.com/...
125 views

### Any Hazards Associated with a High Current Conductor

For a conductor carrying a low voltage (say 12V) and high current (say >500A), are there any hazards that we should beware of? I assume it is safe to touch the uninsulated conductor even when it is ...
72 views

### Step potential (or voltage) near electric power lines

I am not familiar with these topics, and my question is related to this one: Can a high voltage line kill a person without touching it?. In school I heard about step potential, which as far as I ...
162 views

### Relay to Tesla Coil [closed]

If you take apart a Relay (small, mine is out of a printer) and open it up there is a tall coil of wire. Are you able to use that coil of wire to make a HV generator or Tesla coil of a sort?
207 views

### Driving a 5A current through a coil

To many electronics engineers this might seem a stupid question but I was given by my boss the task to find a solution to drive approx. 5A through a coil. The coil's resistance (not considering ...
68 views

### How to cut of the DC supply from a high power motor control?

For my project I built a BLDC motor controller. Now I have to cut of the controller from the battery. A relay is not easy because common my application needs >200Amps The highside switches I ...
210 views

### LED strip power supply requirements

There are a few questions on here that talk about LED power supplies and how to calculate their ratings but none address the issue that my 5meter long 5v addressable LED strip of 18watts power ...
863 views

### High current DC motor driver mosfet

I am developing an high current dc motor driver, and I'm looking for mosfets that can dissipate enough power without heating too much thus without using heatsink. I saw this project : http://navrobot....
7k views

### Controlling high current (1000A) with MOSFETs

I am currently designing a capacitive discharge spot welder and am running into the issue of switching. I plan to use a few super capacitors in series to discharge around 1000A in a very short ...
299 views

### Connecting a 5V 10A 2.1mm x 5.5mm Power Supply to a PCB

I have designed a system to control LED light strips (Adafruit NeoPixel strips) using an Arduino from a C# program in Windows. I have been through the prototyping phase with a breadboard and a single ...