Supply Definition and 513 Threads

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. FuturePhysicist

    Can a Teen Build a Fusion Reactor with a Budget Power Supply?

    Hello, I'm 15 and very interested in physics. I'm building a safe nuclear fusion reactor as a science project. (I know how to safely handle high voltage and radiation) I have a question about the power supply. First off, I know that fusion takes around 40 Kilo-volts and it needs to have a...
  2. G

    MHB Solving Supply & Demand Equations - Get the Price You Need!

    Hi, I'm lost when it comes to doing an equation for supply and demand problems. If I have p=D(q)=24-1.25(q) where p is the price and q the demand, I don't understand how I get the price based on demand. So, for example, if the demand(q) is 200 balloons, I would think it's: p=24-1.25(200)...
  3. N

    Having 12V (cig. lighter) power supply on Suzuki GN125H

    Hello Guys My baby is a Suzuki GN125H (Bought in year 2013). I have been pondering for a while to have some kind of dash cam installed on her. Thus I thought to have a power supply installed so as to get power for the dash cam (only to be used when the motorcycle is ON and running). My...
  4. AdityaDev

    How Can I Safely Obtain a 250v DC Power Supply?

    How do i get 250v dc power supply?? Should I use lots of batteries or is there an easier way?
  5. M

    Where Can I Find Lecture Notes for Many Body Theory of Solids by John C. Inkson?

    hi can anyone help me to get complete lecture notes of a many body course which is taught according the book of "many body theory of solids" by John C.Inkson, please?
  6. P

    Alternators and how they supply current

    Hello, My question is how do Alternators(Like a cars alternator) supply current? Do they act like a current supply or do they act like a voltage supply that can have current drawn up to its rated value? If I have stepper motors being powered from it would they draw the right amount of current...
  7. B

    Charge ultracapacitors with a PC power supply?

    Hi, I am trying to charge some maxwell ultracapacitors (2600F @ 2.5V) with a 1000 watt PC power supply. however when fully discharged, the supply thinks the cap is a dead short and the safety mechanism kicks in and no charge happens. Is there a simple circuit I can use to prevent this...
  8. D

    Can an Uninterruptible Power Supply Prevent Voltage Spikes from a Refrigerator?

    I have a small refrigerator in my projector room. Many times when the compressor in the refrigerator turns off it sends a voltage spike through my home circuitry and distorts the projection image. Example: When I'm watching a movie on the projector everything is working correctly. Then the...
  9. R

    Exploring Voltage & Frequency Effects of AC Power Supply

    Explain the effects of AC power supply parameters-voltage and frequency?
  10. V

    Heat equation in one dimension with constant heat supply

    Homework Statement A bar of length ##L## has an initial temperature of ##0^{\circ}C## and while one end (##x=0##) is kept at ##0^{\circ}C## the other end (##x=L##) is heated with a constant rate per unit area ##H##. Find the distribution of temperature on the bar after a time ##t##. Homework...
  11. A

    DAC0801 with OPA541 as voltage follower, single supply

    Hi all, I'm attempting to use a DAC0801 and an Arduino to control the current through an LED ranging between 0.0 and 1.0 Amps. I tried to supply the DAC with a single power supply as shown in This Tutorial. Unfortunately, the maximum output current is several mA. Would I be able to power an...
  12. O

    If a battery can't supply enough current, does voltage read lower?

    What happens if a battery cannot supply enough current? Let's say we're using a 10V battery capable of supplying 1A of current. A single resistor is then connected so that the current is flowing through it. Using V=IR, if the resistance is 10 Ohms, current is 1A. What if the...
  13. Tesladude

    Why Is My Boss Subwoofer Amplifier Distorting at High Volume?

    I have a boss subwoofer amplifier which I recently discovered was causeing the distortion I have been hearing in my car. this amplifier consists of a PWM powersupply turning the 13.5v from my on car to a +45 -45 power supply. Then there are 8 mosfet transistors, 4 in parralel powering one...
  14. A

    Can differential op amps operate without any supply?

    Just want to amplify the difference of inputs.
  15. Tesladude

    Single supply preamp and active crossover

    Hi I am making a preamp and active crossover using the lm833n dual op-amp. I have already done a project similar to this one and both the preamp circuit and crossover circuit worked beutifuly, although that project used a split supply and for my car audio I need a single supply. I have...
  16. Tesladude

    Useing single supply amp with split supply preamp?

    I just finished a preamp/active crossover using the lm833n but the amp I need to run it with is a class D single supply board. and so the ground on the board is just negative. Can I run my [high pass/ground/low pass] signal into this amp? they are sharing a 24v power supply though and if I...
  17. L

    Spark with connecting power supply to board

    When I connect a DC power supply to a board, why do I get a spark. I connect the ground terminal first and then the Vcc terminal(24V). When I connect Vcc with an alligator clip, I get a spark. Is it because of charging of the bulk storage capacitor?
  18. L

    Grounding SMPS Power Supply: R, C, & Shock Risk

    Assuming a 2 pin connector for an SMPS power supply, what is the role of the R and C that are connected to Case ground. Usually R is in Megaohms and C around 0.1uF,2KV. IS there a risk of shock when the case is touched?
  19. P

    Transformer for a power supply

    I am going to make a power supply. I understand the smoothing capacitor and the full-wave bridge rectifier. I am trying to make a 60V, maybe 10A power supply - maybe only 5A, but I would prefer 10A. I don't have a transformer for it, though. I have researched a fair bit on transformers...
  20. N

    Power supply combination problem

    Homework Statement If I have 3 2V and 1A supplies, and I want to test at 5V, how will I setup? Homework Equations The currents add up when connecting the supplies in parallel, and the voltages add u when connecting in series. The Attempt at a Solution I tried different...
  21. marellasunny

    DC Power supply behaving weirdly:What reason could it be?

    I'm using a DC power supply connected to a TPIC 1021 chip(basically a serial transceiver). I need 12V to power the chip and my DC power supply is equipped with 2 knobs,one changes the voltage and the other changes the current. For some reason,when I get to 5V and turn the volt knob...
  22. M

    Earthed line in Split power supply in op-amp

    What is the work of the earthed line with zero potential between two power sources in the op-amp. What is the normal function of Earth wire except for preventing shock?
  23. A

    Hi, At present, I am learning about Switched-mode power supply and Lo

    Hi, At present, I am learning about Switched-mode power supply and Low drop out regulator using CMOS. Could anyone suggest some good books about this? The main problem here is "using CMOS". Thanks.
  24. X

    Where could I find a high-amp constant current power supply?

    All of the ones I've seen online can only do about 30 amps tops... then there are welding machines, which I am not sure if those can used for non-welding applications without modification of the machine. I am not looking for something that is variable, just something that can output a high...
  25. Tesladude

    Converting split supply amplifier to single supply

    I am talking about those 5pin AB amplifiers like the tda2030 for example. You can power them with posotive and negative 12v, which is equal to a total 24v, Or you can modify the circuit for a single supply, but if you do that so you can use a single supply12v, is it equivalent in output...
  26. Q

    Electromagnet directly connected to power supply not working

    Recently, I made an electromagnet by winding copper wire (length: 4m) around a metal screw. The power supply was from a mobile phone charger (5V). Here's the issue: When I connected the electromagnet in series with a 10 ohms resistor, it worked fine (attracted nearby metal objects), but...
  27. mishima

    Optimizing Power Supplies for Radio Telescope Projects

    Hi, I have two questions about power supplies. I am just curious of what is practical and possible. i) I have been using a 30V wall wart regulated to 18V for a radio telescope project (using LM317). The load does not really need a set 18V, and could actually swing between 13V and 18V. The...
  28. L

    DC Power Supply for Wireless Camera

    Hello, I have a little wireless camera that I want to power on a battery. The camera requires 12V ~1 amp DC to run. I am a DIY kind of person and have a few lead acid batteries from work, all of them are 12V DC, but they range from 4.5 amp to 12 amp. I've worked with AC power in the past...
  29. X

    Where can I have custom made a variable dc switching power supply?

    What sort of company would I contact to have something like this made? I am looking to have made a Variable DC power supply capable of outputting up to 300-400 amps and up to 30v(and as little as well below 1 into the decimal region). Preferably as small as possible. My only requirements for...
  30. B

    From dual to single supply op amp circuit

    Hi, I was just curious, I am no EE, I am an ME and I am trying to make something smaller if you have read my other posts you might know what's it all about, anyways I've been reading a lot about single supply op amps and that's probably the best choice to reduce the amount of power my circuit...
  31. E

    Creating a backup power supply circuit for a dc battery

    I am trying to create a backup dc power supply that is charged by a battery which ranges between 10 and 21Vdc. The backup supply needs to output 20W (10V, 2A) of power for 5 seconds when the battery is disconnected. I have performed some research into how long the capacitor in the backup supply...
  32. E

    Need to Make DC supply & Function Generator

    I wanted advice I saw that DC supply, function generators, and Digital Oscilloscopes were really expensive and I wanted to know is there some way you can use software to turn your PC into a variable DC supply and/or a Function Generator thanks
  33. bibo_dvd

    How Do I Design a Regulated Power Supply Circuit in Proteus?

    hello guys ... i want to design this circuit on proteus and print it to put it on a board this is a regulated power supply circuit the problem is that iam a beginner in proteus ...so can anyone help me how to start ? The Circuit : please help me guys with this ..Thanks :)
  34. Tesladude

    Audio amplifier power supply question

    So I had an old home receiver which broke down so i took out the large transformer 6800uf caps and rectifier. This receiver put out 60 watts out of each chip so from my many hours of being on google in the past, the chips should require +-35v, and because of the increase in voltage after...
  35. PsychonautQQ

    Does Using a Chip in a DC Voltage Supply Reduce Average Voltage Significantly?

    A dc voltage supply that starts with a transformer, into a bridge rectifier, into a big capacitor, into some sort of chip, into a smaller capacitor. Since yall are smart I'm hoping you know what I'm talking about with this crappy description. I was wondering if running the signal through the...
  36. P

    Calculating Amplifier Power Draw from +9v and -9v Batteries - 8mA Current

    Homework Statement Calculate the power drawn from the batteries by the amplifier. The batteries are +9v and -9v. The amplifier draws a current of 8mA from each of its power supplies. Homework Equations P = VI The Attempt at a Solution I'm just a little stumped as to what to do for the...
  37. F

    Home AC supply - why live, neutral and ground needed?

    I have checked How Stuff Work, About.com, Ask.com, Google and even asked an electrical engineer and found no satisfying answer to the following questions: For household AC current, why do we need 2 live, a neutral and a ground 4-wire connection? We get 3 wires from the street transformer where...
  38. J

    Electricity - AC generation, supply and return question

    I am sure this is a set of naieve question first of all. However i'd appreciate someone taking the time to enlighten me, as my mind is boggled by this and has been for some days now. I have watched numerous videos on the subject of electricity but am still somewhat confused. My issue is taking...
  39. B

    Building a 24V AC and 0-30V DC Power Supply: Tips and References

    Hello people! I've been absent from this forum for quite a while. But now I return with questions regarding a little project I have to do. So basically I have to make a AC and DC power supply. I need 24 V AC output and 0-30 V DC power supply. I have a transformer(I think its 220V/24V)...
  40. M

    Which Power Supply Should I Buy for Long-Term Use?

    I am trying to get ahead & learn electronics. I'm just working on my general education classes now. I'm in need of a power supply. I want this to last me through my schooling & beyond. This may sound like a dumb question but are PSU's only DC out? Anyone know one that'd suit me? I'm not sure...
  41. Tesladude

    Easy Q about fuse placement in transormer-based power supply

    Making an amp for a friend, useing a split supply with center tabbed transformer as ground for the chip, I think I heard the current alternates comeing from = and negative into ground, or from = and ground into negative or somthing, so where do I put the fuse?
  42. jegues

    120V AC Supply to Pull Boxes in station yard (Design Problem)

    We have ~78 underground pull boxes (12ft by 12ft) scattered around our 700m by 1500m yard that are passing 12kV cables through underground ductwork.(i.e. pipes) See figure attached for detailed drawing of layout including pull boxes, station service transformers and control buildings...
  43. Tesladude

    Can I use a 2A transformer to power 4 TDA2050 amplifier chips?

    So I want to make a tda2050 amlifier with 4 of these chips, and after posting a lot of questions about different audio chips here, the chips always turn out to draw a few amps EACH as said in the datasheet. On this chip it says a max of 5 amps and people always tell me to supply them with a...
  44. E

    How to size a power supply for x-y stage?

    I have a couple of linear motors + their drivers and I'm trying to make an X-Y stage for a prototype milling machine, but I'm still a student and in a mecheng stream and haven't sized a power supply before, so not sure how to do it. So far this is my thought process: Motor specs: 340VDC (max...
  45. Tesladude

    Power Supply Question: Can It Handle 6A @ 35V?

    Ok this may be a stupid question but what the heck. If I have a power supply giving max of 4amps with 35v and what I am powering draws 6 amps at 35v, then that means the device has 5.7 ohms of resistance. If I put a 3.05 ohm resistor (ish) then this will drop the amps down to 4, but will...
  46. Tesladude

    Audio power supply using DC-DC converter

    So I have been using some small audio amplifier ics in the tda series because they are good and easy to use but I have never had to power one with more than 24v. I am wanting to look into using a chip that requires about 35-40v supply but I can't find a transformer that is past 24v and am not...
  47. R

    Trying to convert an old Dell ATX power supply into a lab power supply

    Hi everyone, I am having some trouble and I really hope someone here can point me in the right direction. I have been following this wikihow: http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply. In general, my power supply seems similar, although the coloring...
  48. T

    Heat pump supply and return temperatures

    A building is to be heated by radiators using an air-water heat pump. While radiators are not the ideal choice, it's beyond my decision making. Naturally I want the supply temp. to be as high as possible, hoping for 55°C in order to keep the physical size of the radiators to a minimum. As low...
  49. J

    Custom uninterrupted power supply

    Hello, I am wanting to build an uninterrupted power supply for a certain device that has multiple electronic devices working together. It will need to run about 1.5k Watts for about 15-30 minutes without an external power source. There will be a few moving parts such as wheels to move...
  50. Mentallic

    Warranty Coverage for Ticking Computer Power Supply?

    Last month I bought a computer online that's delivered already built, and just recently the power supply has begun making a quick ticking sound. I'm unsure if it's the fan or something else, but the ticking sound doesn't start until I'm at my desktop. During boot it's quiet. Anyway, it's just...
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