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. B

    Law of Supply vs Law of Remuneration

    If prices increase, supply will increase. This is the Law of Supply. So if your hourly wage were suddenly increased, then according to this law, you'd be willing to work more hours because each of those hours suddenly offers you more income. Because the higher wage has made working more...
  2. R

    Creating 300VAC for 3 Phase Variable Frequency Drive Testing

    Hello all, I have a 3 phase Variable frequence drive that requires an input voltage of 380-480VAC. I would like to test what would happen if I apply 300VAC to the drive. I have access to 208V and 440V. Is there anything I can do to obtain 300V? I have thought about a variable power supply...
  3. A

    Tube amp power supply question

    I have a US Navy "Plate and Filament Transformer" Manufactured by Hudson American Corporation. This monster weighs 14.5lbs, and is in a sealed steel casing. My output trans weighs 15.5lb as well. There are 16 unlabeled terminals, and I'm working to identify those. Suggestions on how to go...
  4. E

    12V / 6A Power supply. Help with Buck and Boost converters + OR'ing circuit

    Hello all. Maybe someone here can give me suggestion of ICs and make considerations about this design. The attached picture states how this power supply should work. Details: 1) IC 1 probably will be a LT3650-8.4 from Linear Technology. It supports up to 32V of input voltage (40V peak)...
  5. B

    MVDT: Simultaneous change in supply and demand.

    Consider S for supply, and D for demand, both of which are functions of price P. By the law of supply, we know that \frac{dS}{dP} > 0 By the law of demand, we know that \frac{dD}{dP} < 0 Suppose that S(P_{1}) = D(P_{1}) This is the equilibrium point of supply and demand. Now suppose...
  6. A

    Determining Capacity of Liquid Nitrogen Supply System

    Im working on an exisiting Ntirogen supply system that's used to blanket boilers and pipelines etc. at a thermal power plant. I am trying to determine the capacity of the system. I have determined the size of the liquid ntrogen tank to be 8m^3 but I'm lost on how to determine the amount of gas...
  7. wolfspirit

    Power supply for electromagnet

    hi i am wanting to make an electromagnet as a project and i have ordered 916 meters of 0.125mm ENAMELLED COPPER MAGNET WIRE. i am a electronics hobbyist but i have not played with bench top power supply's before and i don't know where to start what is the best/ safest or how to use them...
  8. C

    Need a stable 5V 7A Power Supply

    I am trying to power 230x Laser diodes at 30mA each. Applying 5V to each would accomplish this. However, I've converted two PC Power Supplies to general purpose power supplies and neither of them were able to support the required current. They would drop from 5V to maybe 3.5V at around...
  9. C

    Increasing power supply to building

    I have a warehouse (industrial building) which has a 5killowatt/hour output. This is a 3 phase supply. I need to increase it to at least 10killowatt/hour. The electrical system is modern. But do I need to change the infrastructure to increase the power output? If I need to change the...
  10. W

    Hot water supply calculations.

    HI i am a student from Singapore , and i was told to calculate the amount of hot water needed to supply to a house. The design brief stated 1)Deliver 15 gallons of water at average 110°F (43°C) temperature within 10 minutes; 16 water draws during 1 week 2)Dishwasher: Successfully wash five...
  11. xortan

    Single supply instrumentation amplifier

    Hello, I have attached a picture of the circuit I am working on. I am wondering where should I put a bias circuit when I also have a virtual ground?
  12. Link

    Peltier Cooler connected to Power Supply, is this configuration safe?

    I am building a Peltier Cooler with the circuit diagram below. The power supply will be a battery, but for testing purposes I am connecting it to a stationary power supply. http://dl.dropbox.com/u/10419947/circuit.png I suspect that the peltier coolers which are rated at 30A will draw as...
  13. M

    Isolating and Protecting Your Microcontroller and Motor with Shared Power Supply

    Would there be any fear if I supplied both the microcontroller (through a voltage regulator) and the 12V DC motor using a driver connected to the microcontroller from the same 12V source? Current will be distributed on both the motor and the controller and some other circuits interfaced with...
  14. D

    Economics: Shift in Supply Curve

    Hello guys, I have a quick question: Would a leftward shift of the supply curve result in a shortage?
  15. A

    Question about Kepco Power Supply with Error Sensing

    Hi, here are a few newb questions about error sensing - I have a Kepco BOP 20-10M that I have connected to a solar cell. The purpose is to sweep voltage across the cell and create I-V curves. Attached is a screenshot from the manual showing the setup for my application - using error sensing...
  16. Physics Monkey

    Does quantum mechanics partially supply its own interpretation?

    I will try to keep things brief. I am trying to understand what is considered interpretation. Imagine we have a totally isolated and complex quantum system in a fixed initial state which we can prepare with essentially perfect fidelity. Suppose that this system is macroscopic in which small...
  17. N

    Power Supply Amperage Question

    Hello. I am trying to wire 40 LED bulbs to a power supply i bought with them. Each bulb has a forward current of 100 mA. So, I calculated I would need 4 amps of current to power the lights if I wired them all in parallel. However, the power supply I purchased Says 12V DC 12.5 Amp. Is that...
  18. E

    Power supply using a voltage regulator?

    I would like to inquire if a voltage regulator maybe used as a power supply to a system. I am not very familiar with EE stuffs so any help would be appreciated :) Our system consists of aluminum metal plates submerged in water. It needs to be supplied with 10A (DC) thru the portion of the...
  19. D

    Lower DC voltage on single supply op-amp

    Howdy, I'm using the opa2350 op amp to amplify a <1mV signal by 2000. The problem is I want to have a greater gain (either second stage or larger feedback resistor) however the DC level is reaching too high so that it reaches over 2 V, and I need it under 2 V in order for a digital read into an...
  20. Biosyn

    How Do Cruise Ships Manage Their Water Supply?

    Do cruise ships store clean water aboard in tanks or do they use desalination systems? Or do they take on water from their destination ports? I did a search online and I couldn't find any reliable sources. Is it any different on an ocean liner?
  21. A

    Hi, I wanted to know the following:Input Supply: 56KVA @ 220-240V

    Hi, I wanted to know the following: Input Supply: 56KVA @ 220-240V (Municipal Supply) Required 1000Amps @ 220-240V Can a Transformer be bought to step up and supply the required power.
  22. K

    Is the Law of Supply Inconsistent with Basic Economic Principles?

    Economics: The Law of supply states that there is a direct relationship between price and quantity supplied, ceteris paribus. That is to say when all other variables are held constant, when price increases, quantity supplied also increases. But from my common knowledge, when quantity supplied...
  23. A

    Which H-Bridge driver can I use for power supply amplification?

    I have been tying to design and build a dc to ac inverter. I want to convert 10v dc to 25v ac @ 50hz. I want to use a pic24h microcontroller to generate pwm waveforms to control a H bride driver. I have programmed the pic24h to produce pwm waveforms. I used the LMD18200 as the h bridge driver...
  24. A

    Power supply and power dissipated in a circuit

    Can Power supply be smaller than power dissipated? Because I saw this in one question There are 3 cells, the power supply of the two 4V cells cancel each other. (one is -4W and another one is 4W) So the total power supply should be 16W But in part c, the power dissipated is 4+8+2+6=20W...
  25. B

    Audio amplifier using only 1 op-amp [single supply]

    As the thread suggests, I am trying to amplify the signal from a microphone. Now, I have a circuit which uses 2 op amps with dual supply. That circuit works pretty well. I have to make now, a amplifier using only one op amp, single supply. The sound itself isn't of much...
  26. M

    Lift design -no electricity supply?

    Elevator design -no electricity supply? I hope someone can help me. I'm designing a building for uni that requires several lifts (elevators) which transfer bicycles and pallets vertically. My tutor suggested to look at energy efficient lifts. He mentioned that he had seen a lift, which...
  27. L

    What is the internal resistance of the power supply

    A 76 W light bulb with a resistance of 179 Ω is connected to a power supply with a 117 V. What is the internal resistance of the power supply? Express the answer with one decimal place. So my attempt has been this but I'm not exactly sure whether or not so just making sure this would be...
  28. C

    How Do You Determine the Profit-Maximizing Output in Economics?

    Homework Statement I need to find the profit maximizing production output given any random production function, an output quantity, and a unit price. In fact, I need to find a function which would output a profit maximizing production quantity.Homework Equations I have a relevant picture: The...
  29. sophiecentaur

    'floating' DC supply design needed

    I am going to put a digital panel meter on my boat to measure the battery volts and a few other things. For this, I need a DC power supply for the meter with a negative which is below the boat ground. I could easily use a 9V battery and a push button to keep it on just for taking readings...
  30. O

    Unraveling the Mysteries of USB Power Supply: Is it Just 5V or Something More?

    Hello. This is probably a silly question. But it is something I haven't been able to find an answer too. When I connect something to my laptop through the USB, I know that there is 5V coming from the USB connection ...there are many pinout diagrams about that show this. But what is the...
  31. J

    What is the Relationship Between Fan Blade Size and Energy Transfer in Fans?

    Homework Statement Fan blades of radius r are mounted directly on the axle of a d.c. electric motor. assuming that the fan imparts a velocity v to a cylinder of air of radius equal to that of the blades, and that the density of the air is ρ, obtain expressions for: i. the rate at which...
  32. B

    How to change 3 Ph supply frequency?

    Hello, I would like to know about, How to change the 3 Phase supply frequency smoothly over a wide range(for example 1Hz - 100Hz)? suggest methods if any exists other than mentioned below : 1)Not using Variable frequency drives 2)Not using MG set Pl note that i want to know, how to...
  33. Q

    Trying to make fuel vapor supply system

    Originally posted this in the wrong section. What would be the most basic and solid way of doing this for a gasoline engine? I've thought about using a ultrasonic mister but I am afraid that there may be a potential for a spark, don't want to blow up. I've also tossed around the idea of heating...
  34. Q

    Try to make a vapor fuel supply system

    What would be the most basic and solid way of doing this for a gasoline engine? I've thought about using a ultrasonic mister but I am afraid that there may be a potential for a spark, don't want to blow up. I've also tossed around the idea of heating the fuel to its evaporation temps, but not...
  35. J

    Design Dual DC Power Supply: 0-20V, 0-1.5A, User Selectable

    Hi,i really need help on how to design a dual channel DC power supply that fulfills the following specifications : 1) Operation - User selection between independent adjustment for positive and negative output voltage, and series tracking mode (slave channel tracks the master channel) 2)...
  36. R

    Need help with supply and demand equation

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  37. S

    External Power Supply or Put Regulator on Main PCB?

    I'm close to finishing my first 4-layer board. Initially, we felt that keeping the power supply as a separate unit would be better. This was because we wanted to avoid having heat on the main PCB - mostly because the area where the device is intended to be used is very hot and also quite dusty...
  38. M

    Very specific question on current draw from a dc power supply

    okay so I am just slightly confused about current and about how it is drawn from a power supply, so say we have a device that requires 5 volts and uses a max of 550 milliamps, and now let's say that the power supply used is rated at 5 volts, but 32 amps, does this mean that the power supply...
  39. C

    Configuring op-amp to supply constant current

    Homework Statement How could an op-amp with feedback be configured so that it would supply a constant current to some load, even if the resistance of the load changed? Homework Equations None. Just a general question. The Attempt at a Solution I don't really know how to approach...
  40. F

    Building an AC to DC power supply

    I'm building an AC to DC power supply for a class and my question mainly revolves around the input and output of the whole thing. My source of confusion is where to include my DC output in a circuit such as I would assume that it would be the leftmost node of that full bridge rectifier...
  41. O

    Manufacturer Supply Graph: Drawing the Marginal Cost of Q

    given the marginal cost is equal to: 1/2*Q and i asked to Draw the manufacturer Supply graph. in the picture you can see my tried. Hope you can help. thanks.
  42. L

    What is causing the 0.7V voltage drop across the capacitor?

    I have this arrangement where 0.45V supply and 5v supply are connected to a load (say 6k resistor). The 5V source is forcing current to flow into the 0.45V supply. This is a bit counter intuitive. Power supplies usually source current. Ckt schematic attached.
  43. S

    Sizing the Supply and return tanks for chilled water system

    Well i am currently working as a project engineer for utilities at my factory .This is my first installation of chilled water system.So would be requiring some help in sizing the Chilled water supply and return tanks.I am attaching the picture along so that the system is easily understandable.
  44. I

    Can a Step Down Transformer Handle Universal Input for a Linear Power Supply?

    Building a simple linear power supply for a project and need to spec out a transformer. I have no idea how they're built and used in the industry. I was instead handed a 120VAC input with a 24VAC output and 2A max step down transformer. I am content with it for the moment. But I'm looking to...
  45. F

    30kv .3mA DC power supply tips?

    Hello, I interesting in making a high voltage power supply for capillary electrophoresis. Not much power is required and the DC does not need totally noise free so I figure this gives me a lot of flexibility. I would love the ability to adjust the voltage at 5kv increments in maybe a 5-30kv...
  46. T

    12 volt switch from 5 volt supply

    Hello Please my apologies for mistakes as I am a new member, and I would like to ask a how to question,I am trying to make a system up that I can use on my racing cars ( classic hence no onboard computer ) What I want to do is to have a 12 volt pulse(from 12 volts to o volts) that I can use on...
  47. B

    Reusing Old PC Power Supply: Making Voltage Source & Safety Tips

    Hello, I just stumbled upon an old PC power supply. I thought it would be a good idea to reuse it. I am thinking making out of it a simple voltage source, as it is already voltage source. Can somebody explain me how can I safely get that voltage from those hanging cables that go into HDDs, CD...
  48. P

    How to get a dc power supply to produce 2V at 10-20 milliamps?

    I just got a adjustable dc power supply and I cannot figure out why it will not produce 1-2V at very small amps such as 10-20 milli amps? Is this not possible with a common dc power supply? I would greatly appreciate some help with this...
  49. A

    Making a 5V DC Power Supply for Microcontroller: Possible Damage?

    i want to make a 5v dc power supply for microcontroller i know how to make it i am going to use a 220v to 15v transformer and then by using capacitor and 7805 regulator ic i will convert it to 5v my question is as in transformer pout=pinput (ideally) by decresing the voltage from 220 to 15...
  50. A

    Designing a Voltage Regulated Power Supply

    Homework Statement A voltage regulated power supply consists of a full bridge rectifier feeding into a filter capacitor, and then into an NPN bipolar junction transistor (BJT) operating as an emitter follower, and with the base of the BJT biased using a resistor and a zener diode. The power...
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