What is Supply: Definition and 513 Discussions

In commerce, a supply chain is a system of organizations, people, activities, information, and resources involved in
supplying a product or service to a consumer. Supply chain activities involve the transformation of natural resources, raw materials, and components into a finished product that is delivered to the end customer. In sophisticated supply chain systems, used products may re-enter the supply chain at any point where residual value is recyclable. Supply chains link value chains.

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  1. H

    Why is there a limit to power supply?

    As stated: every now and then you see maximum power output to a motor, a turbine, but why is there a limit to the power output to these electrical/mechanical devices? isn't Power just equals to F*v for mechanical devices and VI for electrical devices? what are these "ratings" and...
  2. P

    Can AC devices (like heaters etc) work on DC power supply?

    Hello, Is it possible to run heating and elements and other devices with DC supply? I have turned on Nickel-Chromium Heating wires with AC but is it okay to use it with DC supply? What's the main practical difference between AC & DC, as long as the voltage and current of supply is...
  3. W

    Design Negative Power Supply with Positive Voltage Input

    Hey guys, Are you guys aware of any designs (other than buckboost or charge pump) for negative power supplies using just a positive voltage (and ground of course) as inputs? Creative designs are totally welcome. Thanks in advance!
  4. A

    Low voltage AC power supply

    Hi all, I need to create an adjustable power supply (AC) that ranges from 0-6 volts with roughly 1 ampere at 1 volt. I have a variac transformer (0-130 volts), an isolation transformer and a stepdown transformer. My question is, does it matter what order I step the voltage down? In other words...
  5. J

    Electrical AC Home Power Supply for Hobbyist/Small Projects

    Hello all! If you're reading this thread then thank you for taking the time to read and/or reply! I appreciate it!:biggrin::biggrin::biggrin: Onto the guts of the thread. Here I will list what I am trying to do, the associated questions that I have found reasonable to ask, and then any...
  6. F

    DC Power Supply to AC Gear Motor

    Hey! I am trying to figure out the best way to run a AC gear motor off a DC power supply. Any help would be greatly appreciated.
  7. K

    What power supply (amps) would run this plasma globe optimally?

    It says DC in 12volts but I'm not sure how many amps this thing can handle... I don't want to plasma myself so I was looking for helpful answers, thanks guys pic of globe (paid $8 not bad) http://postimg.org/image/462gwlj5v/
  8. P

    Signal Generator and AC power supply

    What is a difference between sine Signal Generator and AC power supply?
  9. R

    Frequency of motor power supply 60 Hz versus 50 Hz

    If a 60 Hz equipment needs to be run off a 50 Hz power supply (3 phase, AC) what are typical options? One brute force approach is to simply change motors. But I was wondering if a VFD / thyristor or some such might work? This is medium sized equipment with rating of ~5 kW. As an...
  10. D

    Battery backup to a battery supply.

    Hi all, I hope you're all well :) I am shortly going to be fitting a battery operated device outdoors. Due to the power consumption, I will get 2.5 days out of each battery (max - if I'm lucky). What I would like to do is be able to connect another battery to it before disconnecting the...
  11. M

    Why does op amp saturation occur below supply voltage?

    I built an inverting op amp circuit on a circuit simulator and did a transient analysis on it. I set the gain such that I expected a clipped output, but to my surprise it got clipped at +9V and -9V instead of +10V and -10V, which were the voltages supplied to the op amp. So why would this be the...
  12. R

    Supply different voltages using a dual dc supply?

    Hi all, I have - 2 ICs that requires -10v and +10v - 1 IC that requires -5v and +5v How can I power them using one dual dc supply? Thanks!
  13. R

    Powering an OpAmp with Dual Batteries: Ground-Free Circuit Design

    How to power an OpAmp using two batteries, so there's no connection to mains ground or neutral? This circuit requires ground to force the node connecting the batteries to be at zero potential. How can I achieve the same result without grounding? thanks.
  14. K

    Please recommend a good power supply for this new PC build

    Please recommend a high quality power supply (at least 1KW) for this new gaming build. I haven't finished it yet, but it should be complete within the next few months.. *Core i7 3770K *Corsair Dominator Platinum 8GB DDR3 1600MHz cl9 RAM *MSI Big Bang Mpower Z77 motherboard *Two-way SLI GTX 680...
  15. A

    Gravity is a limitless supply of energy to inflaton field

    In the Fabric of the cosmos, B Greene indicates that 'as the universe expands, matter and radiation lose energy to gravity while inflaton field gains energy from gravity' (page 312). I can accept that statement, but in his note no. 2 (page 524), he indicates that 'the special feature about...
  16. W

    Op-amp (ua741) with only positive supply voltage

    Normally the connection of supply voltage is +-V but now is +V and ground. What happen if Op-amp (ua741) with only positive supply voltage? The op-amp still function?
  17. A

    Problem with constant dc supply by capacitor

    I have a problem how can i obtain a constant value of dc voltage from a capacitor(dynamo) to supply a device.. As we know if the capacitor is directly connected to the device, the voltage will drop and the device will not have enough voltage to function. what is a better way?
  18. S

    Sizing Power Supply in Electrical Cabinet

    What things do I need to consider when selecting a proper sized power supply? Basically this is control power, ouputs are pushbutton lights, alarm horn, and solenoid valves. Do I look at the peak inrush current? Average holding current?
  19. R

    How Strong Should My Replacement ATX Power Supply Be?

    Hello. Excuse my poor Englishe. My power suply stop working, and now i use from neiborgh old suply, but this is too low for all component on my computer. So will you tell me haw strong pover suply i need to use? My computer is old, and use ATX suply. I have, matherboard, 3Gb rams, cameras...
  20. D

    Electronics/Power supply assignment questions

    Homework Statement Hello all, there are three fairly simple electronics related questions of an assignment to be handed in tomorrow, and whilst the initial answers as obvious, I'd greatly appreciate some assistance on elaborating on certain questions: 1. Explain the reasons for requiring...
  21. J

    Engineering Op-Amp circuit to supply constant power

    Homework Statement see image Homework Equations The Attempt at a Solution I can make 2 different circuits to solve this. However, Using just op amps and resistors I am not sure how to make a single circuit that could do this
  22. K

    Is this power supply any good?

    If I'm using dual SLI GTX 680's, is this PSU a good choice/ 1000W with an 80 Plus Gold certification sounds pretty good to me.. http://www.newegg.com/Product/Product.aspx?Item=N82E16817152044
  23. F

    Common ground and supply voltages

    I have already asked this question at electronics.stackexchange but I still don't get it. I thought I understood it in terms of a water analogy but when I went back to electrons it still didn't make sense to me. My first reaction when encountering the idea of common grounding 2 separate power...
  24. J

    Help with power supply design for portable device

    I need help designing a power supply for a portable medical research device for animals. My problem is designing a configuration for multiple voltages with pcb size and power efficiency in mind. I need 3.3 V, +/- 1.5 V, and +/- 20 V. Below I’ve listed device info and estimated current...
  25. 0

    What are the differences between single supply and dual supply op amps?

    I did a bit of searching and I don't get it. What is really the difference between single supply and dual supply op amps? Voltages are just a potential difference. Op amps usually do not have a ground pin so they should have no idea if I am connecting +-15 V or +30V,0V it should still drive...
  26. M

    General Enginnering Problem Dealing with Voltage Supply

    Hello, So I'm facing some difficulties. I'm using a DC voltage supply and connecting it to a PIC Board. The AC adapter that comes with the board outputs 9V DC. To be safe I'm just using 5V from the DC voltage supply. When I connect it to the board the reading from the voltage supply drops to...
  27. T

    Would an inverter welder be a suitable power supply for high amp stepper motors

    Good day people. I am new here and discovered the forum while trying to answer this question. I have a large variety of brushless and stepper motors collected all for the purpose of putting together my CNC mill. The router will be 80 amp 5500KV Kevlar bandaged brushless motor capable of 100,000...
  28. T

    Ultimate power supply/ freq. gen

    Greetings. I'm working on an experiment that needs a power supply/ frequency generator with some unique capabilities. I need to be able to vary the waveform (preferably with a computer) and vary the output voltage simultaneously. Frequencies vary from 1hz to 100khz and voltages range from 120v...
  29. A

    Difference Amplifer Design with Single Supply Voltage

    Hello, I need some help with a difference amplifier design I'm working on. The amplifier has to be work from a positive voltage supply only. I'm having a hard time getting it work with single supply voltage (it works when I use both negative and positive supply voltages). Both the inputs have a...
  30. D

    Understanding demand and supply curves

    Hi everyone, I am having hardtime understanding this problem. I have two functions: QD = 5600 – 8P QS = 500 + 4P Why is the graph like the one attached and not the normal mathematical graph where supply curve starts from y=(0,-125)? Do ignore the consumer surplus and producer surplus part. That...
  31. A

    What is the voltage and current requirement for an Arduino Uno?

    greetings, i have an arduino usb 328 and i want to know the supply voltage and current requirement of it. thanks
  32. A

    Design a Single Supply Difference Amplifer

    Hi, I was wondering if anyone knew how to design a single supply difference amplifier... I don't want a comparator or a difference amplifier chip. I need something that will output an AC wave. The inputs of the amplifier are AC sine waves which have slight difference in amplitudes. I designed...
  33. G

    Hot water recirculation-Domestic water supply

    could anyone explain how to determine the flow rate of the hot water recirculation pump for water heater in domestic water supply?
  34. W

    Replacing Rechargeable Battery with Wall-Wart Power Supply

    I have a LifeFitness exercise bike. It uses a Hawker Energy Sealed Lead Rechargeable Battery that is three cells with a rating of 6 volts at 2.5 AmpHours for 1019 Watts. The battery is recharged by usage of the bike. However, the bike is designed for commercial use and the battery discharges...
  35. F

    MHB Price, Supply, and Demand Questions II

    I need some help finishing a few problems on my assignment. Any help is appreciated 3. The followin equations represent demand curves for a commodity; q. A. q=100-p B. q=10+p C. q=50. What is choke price, slope and price elasticities of demand in the neighborhood of q=100 and q=50. 4. Assume...
  36. F

    MHB Price, Supply, and Demand Questions I

    I need some help finishing a few problems on my assignment. Any help is appreciated 1. Suppose demand is given by Qd=100-5P. Qs=10P. The government imposes a price ceiling of $ \$4$. I am required to calculate consumer and producer surplus which i have, but i need to calculate the dead weight...
  37. H

    Systems Engineering and Management MS or Supply Chain Analyst MS?

    Straight up, I want to be a Chief Office eventually. I can concentrate the SEM MS into many categories--probably choosing healthcare for a few reasons--including their high salary and necessity. However, what about Supply Chain Management...honestly, I don't like the idea of working in a...
  38. 1

    Resistive heating using high freqency power supply in threaded bar

    Hi I've come across a problem at work and was hoping someone could help me to understand what is going on exactly. power supply: 6kW, 9.2A, 5890V, and running at approx 50kHz. this power is routed through ∅3mm Kanthal AF bar, threaded at one end, and what we see is resistive heating...
  39. I

    Electron Gun Power supply

    Hi all, I am making electron gun. I have several High voltage power supply to provide enough voltages to Filament, Anode, Grid, Focus and deflection plates. I want to make electron gun of acclerationg potential of 5-8 KeV. I know I have to give negative supply to cathode or filament. and then...
  40. S

    Optimizing Computer Cooling: Is Using Multiple Power Supplies a Good Idea?

    I decided to use 1 power supply to run my computer and one to run my fans is the a bad idea? 2 fans in the front 2 fans in the back and 1 fan on the side and 1 fan under my graphics card.
  41. J

    Pulsed Power Supply -> Kinetic to Magnetic Energy

    Can anyone give me some feedback on my understanding of this proposed experiment? The device consists of 2 wound solenoids, each forming a closed loop. One solenoid is slightly smaller as to be able to fit inside of the outer solenoid. The smaller solenoid is accelerated by compressed air...
  42. C

    Calculating Charge for Replacing a Power Supply in an Electric Field Experiment

    Homework Statement In lab we did an experiment where there was a 12v D.C. power supply in a glass dish filled with water. We set the + and - terminals in the dish and a piece of graph paper underneath. With a volt-meter we hunted for certain electric potentials such as 2V, 4V, 0V, etc and wrote...
  43. Y

    Looking for switching supply with 110V AC in and about 400V DC out

    As the tittle, I am looking for off line switching supply of about 400VDC output. Anyone know who make this? Thanks Alan
  44. S

    Can I replace damaged capacitors in my power supply with a 1000uf cap?

    The monitor/ tv will power on for around 30s and i can see all the icons on the tv but then will shut off I'm thinking its the power supply so i took a look at it and 3 of the capacitors look bad i have no clue where to get capacitors in the Harrisburg Mechanicsburg are. I don't want to buy...
  45. X

    Basic Power Supply: Design & Connections

    Hi, I have to build a very basic power supply, basically from a 220V AC Wall socket to a certain DC Voltage as the output. I plan on using a transformer, rectifier,capacitor and a voltage regulator. I can see that following this design it can only give out one value of voltage. I thought of...
  46. M

    Need help choosing suitable power supply for DC motors

    Hi everyone, I need a suitable power supply that runs off 240VAC (a regular mains socket found at home) to power two DC motors in parallel. The motors are each rated at 24V, and have a full load current rating of 15A. I've performed a search, but the power supplies I've found are either...
  47. V

    Understanding 3-pin vs 380/415V Electrical Supply

    Hi Guys, Im staying in a country that has 3-pin (UK) electrical supply. I recently come across one of my equipment that need 380/415V 3ph 50hz 4 wire supply. Please advise isit possible to hook them up? what's the difference.
  48. B

    Complex Number RLC Series Parallel Voltage and Current Supply

    Hi Everyone. I have been looking at this questions for a while now and have just hit a brick wall. I have found the source impedances using the the following Z of Current source = 1KΩ - jXC =1000 - j4000Ω = 4123<-75.96° Z of Voltage source = 4KΩ + jXL = 4000 + j1000Ω =...
  49. G

    Need help to determine the supply voltage

    I've inherited a drill and I have no idea what voltage is required to run this thing. The image below displays all the information available. I've also unscrewed the top and found no clues inside. Ditto for the website. Long shot: Does anyone know what the supply voltage of this thing might be...
  50. Faraz Murtaza

    Why do we use the 3phase and not the 4phase or other phase supply?

    why do we use the 3phase and not the 4phase or other phase supply? please answer...
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