Questions tagged [high-current]

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

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2answers
441 views

A little device to control current flows

I would like to have some advice for constructing a little device. The main purpose is to be able to connect 2 Li-Po batteries in parallel and discharge them in the same fashion throughout the ...
0
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1answer
535 views

How to choose the right cables for medium/high voltage applications?

After two years, I will graduate as an electrical engineer. My job will require installing bulbs, Washing machines, heaters, refrigerators and air conditioners ... etc. I know that each device ...
4
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2answers
2k views

Can a high current trace be on outer and inner layers at the same time?

EDIT, COMMENTS: TL;DR: Data doesn't conclusively suggest you can do this, but it seems to be worth trying. The data from IPC-2152 (more in the answers below) is intriguing, but doesn't seem to ...
1
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1answer
198 views

Poorman's shunt theory

Background I'm doing a DIY project of bulding a 1kW Induction heater. in the process I have built a poormans PSU out of a MOT ( and a 50V 25A brigde rectifier. with not even nearly enough of a ...
0
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1answer
985 views

Explaination of high current zener transistor regulator circuit

This is a high current zener TRANSISTOR regulator circuit. I want to know What does "high current" mean here? How is this circuit working as a zener regulator? What is the purpose of transistor here?...
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1answer
336 views

PCB - High current PTH

Some power boards are failing a high current (lightning) test where an MOV lead is used to transfer the current to the bottom of the board - see MOV lead and pad attached. The issue seems to be that ...
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2answers
812 views

10 3W RGB LEDs in series control current

I'm having the following schematics connected to a 5V 25A DC power supply. All LEDs are 3W RGB, additional values are. R1: 6.8 ohms 1/2W R2: 4,7 ohms 1/2W R3: 4,7 ohms 1/2W I'm using an Arduino Mini ...
0
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1answer
102 views

How to avoid high current flow through long runs of addressable LED tape without compromizing the data ground

I'm battling with Addressable LED tape power. I have 12V TM1812 RGB LED tape and want to run the maximum lenght in pixels , which is just over a 1000 pixels. This means the current will be around 40 ...
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1answer
208 views

Peak Current of PWM

I am designing a controller for a hotwire cutter. As measured, the resistance measured is 1 \$\Omega\$. The power is switched on and off with a 555 astable mode to produce a pwm of \$V_{on}=12\$ V and ...
1
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1answer
2k views

How much current can a computer power supply deliver when used as differential power supply?

I have a computer PSU which has +12 and -12 volt rails. Although on the side of the supply it says that the -12V line can only deliver 0.5 A, I have tried connecting the +12 and -12 lines across a 5 ...
3
votes
2answers
762 views

Designing a high-power PCB

I'm trying to build a Raspberry Pi cluster (at least 32 Pi's) and I need a convenient way to power them all. So I'd like to design a power distribution board. The distribution board will have USB ...
1
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3answers
409 views

How to shut off a valve safely in the power outage

In a scenario of sudden power loss, my latching valve will be still open by default. That valve operates with 5V, and needs 0.5A current with duration of 0.1s to be shut off. How to do that in a cost ...
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2answers
2k views

Make-Before-Break Relay with Very High Continuous DC Current

I need to use a relay in order to do field sweeps with my electromagnet, which is hooked up to a couple very beefy monopolor power supply. (My magnet's impedance is ~2 Ohm, and I am putting ~40 Amps ...
9
votes
3answers
2k views

PCB layout for high side switch (high current)

I'm working on a PCB layout for two high side switches. You can see below a picture of my current layout. The copper weight of the future PCB will probably be 2 oz/ft² (double sided). I use two p-...
4
votes
3answers
3k views

Dupont connector for 5A

I have to do a connector adapter, that has to handle 5A current, from a pwm motor driving circuit(power mosfet), to the motor. I have not found the current rating for dupont connectors It is ...
5
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3answers
7k views

MOSFET as Variable Resistor in High Amp Circuit

I'm trying to create a variable wattage heater circuit as shown below. I'm clearly not a trained electrical engineer (simply a hobbyist) so please forgive my crazy idea and general stupidity. You ...
0
votes
1answer
701 views

How to detect if a high voltage fuse is blown

I have a 150A fuse on a 100A @ 400V nominal battery pack. There are 5 service relays and 2 isolation relays (one on each pole) in this battery pack. I'd like to make sure that none of these relays can ...
2
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2answers
1k views

Transformers and Short circuit

I want to ask a question about transformers. Primary and secondary parts are isolated electrically and there is only a magnetic coupling. If there is a short circuit in the secondary part, is our ...
2
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4answers
3k views

Is a relay with a 20 amp rating enough to handle the current from a residential hot water heater?

In Israel the houses usually have a hot water cylinder on the roof of the building which is attached to a solar water heating unit, but which also is connected to an electric heating element which is ...
1
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0answers
616 views

Oscillations in Master-Slave High Current Source

I am attempting to trouble shoot a circuit and I am a bit stumped. The circuit is high current source (10-20A) based on a master-slave configuration using OPA549 high power op-amps. There is one ...
0
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2answers
1k views

Controlling output voltage (12v to 0-12v 5a)

I'm having a problem finding the right circuit/device for a circuit I need to make (I'm quite a noob). It doesn't matter what the input voltage is, but I need an output voltage which I can digitally ...
1
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2answers
123 views

Controlling the temperature of mica band heaters mounted on extruder barrel very precisely with power rating of 5kW

I want to control the temperature of mica band heaters mounted on extruder barrel very precisely with a power rating of 5kW and 220VAC. What should be the best for the switching purpose of these ...
2
votes
3answers
470 views

Up to ~1000 A constant current supply 10-40 VDC

So a little background to explain the need. Occasionally we need to test starter motors (for engines) and provide enough power when the load (engine) causes the starter to pull in excess of sometimes ...
7
votes
2answers
889 views

Can I build a high-frequency SMPS choke out of an arbitrary coil of wire?

Suppose I want to build a boost converter that runs at 100 kHz, with an input voltage of 600VDC and an input current of 100 amps. (This is hypothetical, I know the semiconductors involved would be ...
2
votes
1answer
437 views

High Peak Current Voltage Regulator

I have an ICs which has an operating voltage range from 3.35V up to 4.5V. It typically needs a 20-milliamps current but it can have 1.9-amps current peak. Moreover, my system will work with a battery ...
0
votes
1answer
152 views

Multiple voltages power suply, high current

I'm trying to design a battery back-up power supply for my home network devices. I need these: 48 V / 40 A 24 V / 10 A 12 V / 2.5 A 5 V / 5 A I got a 48 V / 60 A industrial power supply with battery ...
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3answers
1k views

PCB trace width calculation

Take a look of this product: http://www.hobbyking.com/hobbyking/store/__68694__HK_Pilot_Power_VI_Module_Distribution_Board_And_Dual_UBEC_ALL_In_One_120A_and_10s_.html It says is a 45 by 45 mm PCB, ...
2
votes
2answers
2k views

Low voltage audio amplifier clips on 8 ohm loads

Exposition time: One could call me a freshman in electronics and I just designed my first little audio amplifier for headphones. (Pocket design, I want to be able to drive 4 headphone pairs from a ...
6
votes
4answers
9k views

Square Wave input into Transformer

Can a square wave generated using an astable NE555 be used as input of a transformer instead of AC? Say, I generate a square wave of 60Hz using NE555 and a 24V at 6A supply and feed it into a ...
0
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1answer
3k views

Winding a Toroidal Transformer

I have a toroidal ferrite core which has an outer diameter of 15 cm, inner diameter of 11 cm and height of 4 cm. I want to use it to make a transformer which takes in mains voltage (240V) and outputs ...
1
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3answers
1k views

Toroidal Transformer High Current Output

Can a 28-0-28 amplifier toroidal transformer like this be practically used as a high current supply at low voltages? I plan to put a couple of turns of 4 gauge wire through the centre. I want to use ...
1
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2answers
329 views

Generate 10A for stress testing

How could I, a cheapskate hobbyist, generate large currents around 8–10 Amps to run through a short circuit? That is, the objective is to stress test a very low-resistance circuit going ...
1
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2answers
2k views

How to make a 12V DC variable voltage supply with more than 30A output?

I have a SMPS capable of outputting 33A at 12V and I would like to make it have a variable output with full current potential, or close to it. Now, Is it possible to do it with a PWM-controlled ...
0
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1answer
95 views

Safely Driving a Brushless Motor

I am currently building a quad-copter out of an Arduino. I decided to make my own ESCs using MOSFETs, EMF sensors, and the Arduino. These are the motors that will be driven: http://www.hobbyking.com/...
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1answer
131 views

How do I place a long wire to make the EMI and inductance minimum?

I'm going to measure high current. After seeing that there is not a lot of low valued sensor resistors in the market and the available ones are very expensive, I decided to make my own current sensing ...
3
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2answers
4k views

Switching high current and high voltage for coilgun

I am building a multi-stage coilgun and need to be able to electrically switch 450V and over 100A somehow (virtually shorting large capacitor bank)... I've tried using IGBTs but fried them. I also ...
3
votes
1answer
1k views

What is the ideal shape for rail-gun?

I was trying to create a low voltage (30V) rail-gun. I have quite a hard source of power that doesn't drop voltage upon current drain, further more, this source is re-inforced by big Tesla capacitors. ...
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3answers
3k views

how to create a high current source?

I'm looking to observe magnetizing offsets of various current sensors. The idea is that when you pass a high current pulse (close to the rating of the device) through a current sensor and then return ...
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2answers
3k views

Arduino driver for lots of high power LEDs

This is my first Arduino/electronics project and I am a little bit confused about the components I need to handle huge amount of currents and the circuit. I want to have full control of 32 (maybe 40) ...
-4
votes
1answer
64 views

Supply high power to mp3 device [closed]

i have an old mp3 device , by wrong i supplied a high volts to it through the battery place, Now it isn't work . By guessing . Which part of it's board has affected by this high power, to replace it?...
4
votes
3answers
687 views

Why do they place a high current device in a low current package?

For instance, it is said that the practical current limit of the TO-220 device is 75A. But I frequently see MOSFET devices for which the specified maximum continuous drain current is above 75A. (...
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2answers
146 views

Giant Connector Plug

I'm looking for a very big connector plug, similar to the old SCART connectors, except I need it to be at the following specs: No Of Pins: At least 35, preferably 50 Gauge size: At least 12 pins with ...
-1
votes
2answers
3k views

300 amp 12vdc power supply on a standard(American) wall outlet

I am building a project that will draw around 300 amps at 12vdc, for about 40-60 minutes then it will rest for a few minutes. For this projects application it will be very impractical to build a ...
0
votes
1answer
1k views

Separated powers and high power switches? Alternatives to relais?

I want to use an Arduino (5V, 0-40 milliamps) to control some switches, which in turn control a high current line (12V, 40A). But the relays which I use use too heavy coils for the Arduino to pull off....
3
votes
2answers
2k views

How do plasma lamps work? [closed]

I've been trying to understand how plasma lamps (or plasma globes, according to Wikipedia) work and why you don't die a horrible fiery death when you touch them. What I've got so far is that the ...
4
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2answers
7k views

How do current ratings on barrel connectors work?

I'm trying to power a pcb using a psu that is rated at 12V 10A and has a barrel connector with a jack that is 2.5mm x 5.5mm. I've tested my board with screw terminals and it draws about 8A. I want to ...
0
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1answer
875 views

Where to salvage inductors?

I need a toroidal inductor for my ZVS flyback driver. The value should be between 47uH to 200uH. It should be able to handle 6A. Where can I salvage them from?
5
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1answer
2k views

How to measure car battery current precisely in wide range (starter current, charging)

I want to measure car battery currents in high resolution and in wide range and both directions (including engine start and charging currents). I don't need very high precision measurement, but I ...
0
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2answers
185 views

Driving an electromagnet through a shift register? [closed]

I want to know if it is reasonable to use a shift register to control electromagnets. We want to drive electromagnets with about 400-500mA. The TPIC6B595 data sheet claims "Each output provides a 500-...
4
votes
2answers
1k views

Driving 3 LEDs at 1000mA. Is this circuit / driver ok?

I want to drive 3 LEDs in Series at constant current of approx 900mA - 1000mA. Will this circuit work? The LEDs are Vf 3.55V @ 1000mA. LED Diagram R1 = 0.25W 100k Ohm Resistor R2 = 2W 0.47 Ohm ...