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. S

    Supply voltages to N and P type semiconductors

    Ok, maybe someone can point me in the right direction ...hopefully anyway. I know this is probably a really stupid question, but as Mr Mackey in South Park said - "there are no stupid questions, just stupid people", so here it is. I was in class simulating N and P type CMOS devices using...
  2. L

    Shore power supply for the vessel

    Hi all, I am facing the problem with shore power supply for the vessel. At our ship yard, sometimes we need to arrange temporary electric supply for the vessel meanwhile their generators are overhauled. For 440 V 60 Hz i am using portable generator supply and for 415 V 50 Hz supply i am...
  3. M

    Help Fix RCCB Power Supply Issues

    Hi, I got a problem and seeking for help, could anyone do me a favor. The power supply of network data centre is supplied by a UPS. The UPS’s output connects to 2 nos. of 800A MCCB individually. And the circuits are protected by: ( Form >> to ) A) 800A MCCB >> 100A MCCB >> 100A AI...
  4. C

    Power supply and Multimeter questions

    When measuring voltage or current, why are we suppose to crank up the power supply? For example, when we are measuring voltage we are supposed to make sure sure the current is set high enough so it won't limit the voltage, and vice versa for measuring current. I thought if you crank up voltage...
  5. Evil Bunny

    Fixing Noisy Power Supply Issues

    "noisy" power supply? So, there was a high pitched sound coming from a component (a radio, not sure if it was a transmitter or a receiver)... An experienced technician said that it sounded like a bad power supply... He mentioned something about a bad capacitor. The power supply was changed...
  6. T

    Why does the supply go past pull-downs but electrostatic voltage through pull-down?

    When you use a pull-down resistor (resistor to ground) between a switch and a gate to prevent floating, why does the supply go past the pull-down but electrostatic voltage through the pull-down? Shouldn't it just go through whichever one has less resistance? Is there some kind of 'bandwidth...
  7. B

    Hooking up 24vdc power supply to motion controller

    Greetings. I am asking for help connecting a Wago 24vdc power supply to a Galil motion controller. I have a very limited electrcial background. The power supply (ps) has 120vac L-N-G inputs (I get that part) and outputs 24vdc/2.5A as two plus (+) outputs and two minus (-) outputs...
  8. N

    Amp dangers from a universal power supply adapter

    I have a treadmill that has a display monitor that uses either 4 D cell batteries or an optional adaptor. The back of the monitor states it uses a 6v 1.66-2.0a/max input. I purchases a universal power adaptor that has a fixed amp rating of 3 (6v obviously is an option). The question is: what...
  9. J

    Cancelling out Power Supply Noise out COMPLETELY

    Hi I have a HV (R2) resistor that I want to test for noise. Assuming the 2 low voltage resistors are perfectly stable and HV R1 is also perfectly stable. How could I completely cancel out the noise of the power supply if the bridge was slightly unbalanced? Does any circuit exist that can do this?
  10. G

    Understanding Power Supply and Ethernet Adapter Wiring: A Guide"

    I'm trying to hook up my power supply to I/O Ethernet Adapter, and am getting confused with the wiring terminology. The power supply is 24V DC (+/- terminals) and the Ethernet Adapter has NC, Chassis Ground, Common (C), and V (Supply). I guess I am getting confused with what exactly Common...
  11. K

    Designing a power supply with a center tapped-transformer and a zener diode.

    Homework Statement Design a full-wave regulated power supply using a 5:1 center-tapped transformer and a 7.5 V, 1 W Zener diode. The power supply must provide a constant 7.5 V to a load varying from 120 to 450 . The input voltage is 120 V(rms), 60HZ.Homework Equations The Attempt at a Solution...
  12. N

    Charge bateries with regulated power supply

    I have a 230V to 13.8V / 20A DC regulated power supply and two 12V / 50A car batteries. What circuit must I use between them to charge the batteries and how long it will last the cycle? Thank you
  13. R

    High voltage high amperage supply

    Hello there i have an idea i want to try to build and i want to see what you think. I want to build a tesla coil that instead of making high voltage low amperage switch the coil sizes around so i have something that makes high amperage and low voltage say about 300-500 amps. Then i...
  14. K

    Changing AC Supply Frequency: Resources & Suggestions

    I would like to ask how to change the frequency of the ac supply (frequency = 50Hz) to a ac with a very high frequency. Does anyone suggest any materials or websites for me to reference? Thanks.
  15. A

    Power Supply Output: Connecting + and - to Plates

    I am trying to make a capacitor by connecting + and - to the electrodes between two parallel plates. There are + and - and Ground in the power supply which of these should I connect to the two plates and how does it work. thanks
  16. H

    Need help raising the voltage on a power supply that I am making.

    I am currently building a DC power supply for a HHO Fuel cell. I am looking for HIGH current at a relatively low voltage (12-15 volts). I already have modified a MOT (Microwave oven Transformer) for high current. I replaced the high voltage secondary with 3 secondaries each consisting of 12...
  17. Y

    I have two transformers of rating 500 KVA. Power supply avaiable is 11

    I have two transformers of rating 500 KVA. Power supply avaiable is 11 KV. what size of HT cable should I use?
  18. D

    Use of input current and quiescent supply current in logic gates

    What is the meaning and use of input current in logic gates? Also meaning and use of quiescent supply current.
  19. T

    Using a Power Supply - Questions & Answers

    Um, so I'm building this power supply but I am somewhat new to a lot of actual electrical devices... I have a precision power supply unit. There is an AC voltage option and a DC voltage option. Within the AC voltage are there are three terminals. The outer two are yellow and marked...
  20. H

    Voltage regulator (from power supply) capacitor values?

    Hello our doctor gave us a project to design a power supply which looks like this http://i541.photobucket.com/albums/gg395/healing1000/powersupply.jpg however at the voltage regulator part (78xx and 79xx) there are 2 capacitors (the 2 on the right) which I don't know how to find their values...
  21. P

    Bench Power Supply With Microcontroller

    I know this question is so simple and probably stupid that it will enrage some people, but bear with me. :) When connecting a bench power supply that does 5V@3A, to let's say a P16F88, should I use 25 ohm resistor to bring those 3 Amps down to 200 ma? According to the p16f88 datasheet...
  22. S

    High Voltage Pulsating DC supply

    Hi My introduction to Electrical Engineering is Like one hundredth of a starter But I am here to have some Help I want to Design a Pulsating DC power supply of 1K or more with micro or Nano Time constant I will highly Appreciate any kind of help and Guidance and also want to ask is...
  23. C

    Finding DC Supply Total Current, Resistance & Voltage

    1) How do i Determine the total current provided by a DC supply? 2) Total Effective Resistance 3) Total Voltage Asking these questions for a friend, thanks!
  24. M

    Single supply op-amp configuration

    I'll try to make my description quick so you don't tldr me. So I worked on this project in school on a 6.5inch woofer. I took it from an old computer set (creative) and the amp was dead. I designed and built a new dual supply class ab stage amplifier with a low pass filter. So now I don't...
  25. Y

    How to connect 11v Battery to 5.3 V power Supply

    Hi friends, I don't have any electrical background. In my experiments I have 11 V Battery which has to power up PC104 which needs 5.3 V. Can please help me out how to step down the voltage. Thank You, Yawanth
  26. G

    Wiring a 115/230 VAC Power Supply Without a Wall Plug

    I have a power supply with an input of 115/230 VAC. There is no wall plug wired to it, just cut wires. I don't have much experience with this. If I wire this to a cord can I plug it into the wall (120 volts)?
  27. H

    Problem running 220volt motor on local electricity supply

    The local electric supply in our country is 415 volts. Our company recently imported plant and machinery. All the motors and electric panels that have been imported are on 220/110 volts specifications. The total load of the motors is 110 Kw. The motors are now tripping as soon as they are...
  28. PainterGuy

    Maximum rated voltage/current value on lab power supply

    Hi :smile: While helping me with the queries please don't forget that I'm a beginner to this technical stuff (or, my knowledge of this area of knowledge is nothing more than beginner's! :) ). I'm trying to understand how simple lab current source and voltage source works without getting...
  29. U

    Current limited power supply and Ohm's law

    Suppose I have some resistor with resistance R. Using a typical power supply, application of a voltage difference V across the resistor leads to a current draw of I = V/R according to Ohm's law (so long as the only circuit element is a resistor without any complex impedances). Now, suppose I...
  30. S

    Power supply voltage range design cost

    Today's switch mode power supplies for computers mostly have a nominal voltage range of 100 to 240 volts. Whatever the added cost of making them operate over that much of a range there is must be less than the cost of having separate products for the two major narrow voltage ranges used...
  31. Femme_physics

    Circuit can supply negative voltages ?

    Circuit can supply "negative voltages"? I read an article trying to understand voltage dividers better. I then read this quote that threw me off! Now, what does it mean that a circuit is designed to supply both positive and negative voltages? I'm pretty new to electricity. All I need is...
  32. F

    Searching for Automatically Switching DC Power Supply for Research

    Hi. Does anyone knows about a DC power supply that can switch between forward bias and reverse bias automatically? For example, I start it with forward bias, after 1 minute, it will automatically switch to reverse bias, and after another 1 minute, it will automatically switch to forward bias...
  33. K

    Help with a power supply (farnell G6 60a)

    Hi all, I'm brand new to the forum and dreadfully new to electronics in general, but am doing my best to learn and I figured this may be a good place to start. (ps - this is not homework..I'm not a student of an electrical engineering, just an enthusiast trying to learn :)). I'm trying to...
  34. Kawakaze

    Noise from unplugged power supply :S

    I have a ccd camera that I put a peltier element into, and there is noise from the power supply, even when it isn't plugged in. Just plugging the jack in gives noise, I tried the bypassing thing with a capacitor with no effect. Plugging the PSU in gives no change. I tried moving the power supply...
  35. F

    Calculating Voltage Ripple in a Full Wave Rectifier Circuit

    http://img683.imageshack.us/img683/5329/unledtw.png So its basically a power supply with a voltage regulator LM317T at the end. The question asked to find the voltage ripple across the capacitor. So I basically solved the peak voltage found which would be 12V * SQRT(2) = 17 volts...
  36. R

    Single Supply Summing Amplifier

    Hi everyone, I'm going to comment about something that happened to me today using Summing OpAmps. First, I simulated the attached circuit in a Project Board. It's supposed to be a Single Supply summing op amp with unity gain. The thing is it never worked. The signals didnt even appear in the...
  37. C

    Phase Angle guidance between the current and supply voltage

    Homework Statement Hi, I am slightly confused by which variation of phase angle formula to use relating between the current and voltage. Would this still be (tan-1 XL-XC/R) for a RLC parallel circuit? Voltage = 90V ac Xc/Z1 = (9 - j4) XL/Z2 = (12 + j15) Current = 11.27 Amps Total...
  38. J

    Clipping and V supply and Voltage at collector of a transistor

    Hi, I am new here and I need some help on a massive project that has a large bearing on our end of year results. Its got to do with clipping of an output signal in a common emmitter BJT n-p-n Voltage Amplifier circuit. It asks us to comment on the clipping and relate it to Vs and Vc. Where Vs is...
  39. S

    Understanding Power Supply Ratings and Compatibility

    Hello i need a 9VAC 1.3A source but it's hard to come by... is there a way i can use a similar source? i don't know too much about this sort of thing but from what i understand the power output is more important than the individual current or voltage out... is that right? for example, my...
  40. U

    Can a high-Vdc power supply be an electrostatic generator?

    Hello all, I am interested in placing a static charge on a conductor by means of an electrical circuit. One way to do this is by means of a Van de Graaff generator which uses the triboelectric effect to generate net charges, then places them onto two conductors having equal but opposite...
  41. PainterGuy

    Some functions of power supply

    hi everyone, here is picture of power supply:-- http://img696.imageshack.us/img696/8841/powersupplyg.jpg at top it says power supply can give 3A. would this mean when resistance is 10 ohm is used and voltage is set at 30v. then current will be 3A. please tell me. what is the function...
  42. T

    Help me in selecting a power supply for conductivity measurements

    Hello all, For my project, I am trying to measure the solute concentration of water inside a porous ceramic plate (~2mm in diameter). I am using platinum electrodes. There are two ways I think I could possibly do this. 1) Place two electrodes on the sides of the porous disk 2) Place 4...
  43. L

    Convert Power Supply to 12V Lab Power Supply

    I want to convert my power supply into a "lab power supply" but a lot less simple. I just want a 12V output on it. The power supply has 2 12V rails. Is it possible to connect both rails to increase amperage? Thanks for you input.
  44. N

    How should I properly supply power to the DAC813?

    Hello, could someone please verify the proper way to supply power to this particular DAC chip: http://focus.ti.com/lit/ds/symlink/dac813.pdf Do I need to supply both +15 V and -15 V into +Vcc and -Vcc respectively? Or do I just supply +15 V to +Vcc and have the negative return lead of that...
  45. Drakkith

    Where Can I Find a Connector for a 40kv 15ma High Voltage Power Supply?

    Hey all, I've got a high voltage power supply that I need some sort of connector for. It's a 40kv 15ma output and the connector screws in over a hole that leads to an enclosed plastic tube with a metal rod about halfway down. Are these standard connectors or do i need to do something crazy to...
  46. J

    Can One Secondary Transformer Power Multiple Outputs on a DC Power Supply?

    I've been looking ahead in my textbooks and reading some stuff online, and there's some things I'd like to know about DC power supplies. The DC power supply we have at school has 3 independent outputs, 2 variable and one fixed. How would they be isolated from each other like that...
  47. P

    Dual Power Supply: Why Use +12/-12V?

    why do we use a dual power supply? Why, for instance, do we use +12 and -12 volt instead of just a 12 volt power supply.
  48. M

    How do i get 30v from a dc regulated power supply?

    anything?
  49. B

    Low Voltage AC Supply from Wall wart?

    Hi - I'm just starting to build a few basic circuits and am looking to get easy access to a low voltage ac power supply. I pulled apart a power brick, and it only has 4 diodes, a cap, and a transformer. If I pull out the cap and the diodes and solder the cord to the leads on the transformer, I...
  50. Hepth

    What Happens If a PC Power Supply is Maxed Out?

    I currently have a slim-line PC I bought real cheap. http://www.abcwarehouse.com/product_catalog/pc_proddetails.asp~prod_id~34788# I paid $200, not bad. Well, the case is Custom, as is the internal power supply. The video card is lacking, and I know there are quite a few pci-e...
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