Supply Definition and 506 Threads

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)...

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...

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

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?

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...

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...

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...

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

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...

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...

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...

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...

Just want to amplify the difference of inputs.

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...

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...

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?

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?

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...

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...

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...

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?

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.

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...

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...

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...

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...

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...

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...

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...

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...

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

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 :)

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...

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...

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...

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...

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...

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)...

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...

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?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...