Questions tagged [high-current]

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

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2answers
618 views

Tactics for Controlling Heat in a High Current Bridge Rectifier?

I'm having trouble controlling the heat from running a bridge rectifier (Similar to http://www.amazon.com/1200V-Single-Bridge-Rectifier--QL100A1200V/dp/B00EZ8BUMU/ref=sr_1_2?ie=UTF8&qid=1459556648&...
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2answers
270 views

High-current capable, high precision sine wave

I'm actually asking 2 questions - one about sine wave generation and another about high rate / precision voltage measurement. I'm working on a project where we have to generate a sine wave on top of ...
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1answer
2k views

LM338 with pass transistors

Looking for formulas for figuring out R1,R9,R10. The transistors and regulator is what I have on-hand. Any help would be appreciated.
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1answer
1k views

How to add frequency control feedback loop to a circuit for an inductive heater

I am interested in a design made by an MIT student, Bayley Wang, several years ago for a 30kVA induction heater. One engineer on this site with professional expertise examined this circuit and ...
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1answer
342 views

Drawing current [duplicate]

I read some where that an electronic device will only draw the required current for its operation but i dout a device working at 5 volt 500 mah will burn at 5 volt 3 amp source is this true or will it ...
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1answer
732 views

High Current Power Supply Design [closed]

I'm looking to design a high current low voltage power supply that goes beyond my limited circuit knowledge. I have plenty of experience putting circuits together, but not so much on the design side. ...
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3answers
244 views

High current voltage reference from a small current constant reference and regulator

Say I need a high current voltage reference. A very accurate and low noise part is available, but can only supply 10mA and happens to be expensive. So multiples of this part cannot be used. What if we ...
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2answers
146 views

How can you cheaply make an output pin source/sink about 5 amps of 5vDC, 12vDC, 24vDC, and 120vAC selectively?

I'm working on a project and need to make I/O pins that are configurable to offer around 4 Amps or more of each voltage: 5vDC, 12vDC, 24vDC, and 120vAC. The pins need to be able to source and sink ...
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2answers
341 views

How much power (amps) through 5.5mmx2.1mm power jack? Through a DC switch?

I am in the process of building a DSLR cooler (I use it for astrophotography) using a couple of TEC1-12703s (12V 3.3A) or TEC1-12704s (12V 4A). The ultimate idea is to run the TEC's at a higher power ...
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1answer
1k views

Buck boost converter - High current 15A@12VDC +

I don't have much experiences from designing and understanding more complex circuits. I only have basic knowledge how different components work and how to create and calculate simple transistor ...
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1answer
109 views

Alternative circuit for obsolete product [closed]

i am looking alternative circuit or module the same as DTL35A-LC. It is a analog/voltage-controlled current sink module. Its output can reach up to 5 Amps that i really need. So can you suggest a ...
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2answers
419 views

Ideal voltage regulator for power amplifiers

I'm working on a dual rail power supply that will provide DC current for 4 power amplifiers. Two of them require 20V and the other two 25 - 50V. All 4 draw a maximum of 2.5A of current, hence my ...
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2answers
1k views

12V to 6V Regulator at high current

I am currently working on a project when I need to step down 12V to 6V. This 6V will serve 3 motors. The motors pull 4 amps, 1.5 amps, and 1 amp when they are each at full power. I am having trouble ...
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1answer
719 views

Turning a PMOS Common Source into a Voltage Follower

So I have this PMOS Common Source. I thought I'd make it a Voltage Follower by simply pulling it down to ground. But when SPICE-ing, whatever value the pull down resistor I give, it just won't work as ...
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2answers
518 views

Inrush current limiter 230V AC 16A (~325V DC 3,6kW ) - low power losses - safe

I need an Inrush-Current limiter and struggling with a good starting point. Basically I was thinking about using a NTC which then get short-circuited by a relais after a short period of time to ...
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4answers
5k views

300 Volt / 2 A - DC Power Supply

I want to design a 300 volt DC / 2 Ampere power supply, for a high-power amplifier circuit. The input can be either 220 volt AC, or 18 volt DC; both of them are available, however, 220 volt AC is ...
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1answer
1k views

Motors and H-bridge - High current on PCB

I want to control a motor by using H-bridge on PCB. I am using IRF4905 and IRF3205 MOSFETS (P and N, respectively), and some 4N27 Optocouplers. The motor takes about 70 amps How can I make my ...
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3answers
438 views

Using two batteries to increase current sourcing capacity

I'm working on a project where I am planning to use two 5V USB Power Banks because one cannot supply sufficient current. These Power Banks are 20,000mAh each and have built in circuits to regulate ...
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2answers
539 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 ...
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1answer
564 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 ...
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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 ...
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1answer
214 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 ...
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1answer
1k 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
341 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
888 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 ...
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1answer
106 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
230 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 ...
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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 ...
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2answers
788 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 ...
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3answers
423 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 ...
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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-...
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3answers
4k 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 ...
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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 ...
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1answer
737 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 ...
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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 ...
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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 ...
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0answers
656 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 ...
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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 ...
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2answers
130 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 ...
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3answers
479 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 ...
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2answers
919 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 ...
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1answer
451 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 ...
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1answer
161 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, ...
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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 ...
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4answers
10k 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 ...
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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 ...
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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 ...
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2answers
338 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 ...