Supply Definition and 506 Threads

Hello and good day. I am currently involved in research that seeks to utilized a Walker Scientific power supply and magnetic. The system is old but functional. We seek to utilize the magnet in order to conduct some low temperature experiments. We need information on this power supply, of which...

Hello, This problem is about a.c. I am used to simply using basic a.c. supply symbol in circuit diagrams. Here, I need to draw the set-up for an experiment where I can change the frequency of the supply (not the voltage) and see how this affect the peak current through a coil. how can i...

Let's say you have a UPS 550 Watts (1100 VA). How much current or watts does the unit itself used? This is important when your source itself is limited by the wiring.. let's say all your computers total 500 Watts and the wiring is sized for roughly that.. Would the UPS draw more current or...

I have a very basic question for the professionals here, but I am having a small issue with my parallel LC circuit. I have an inductor that is 6.425mH, a capacitor that is 217uF (it is two 470uF aluminum electrolytic caps connected in series to make one non-polar 217uF cap). I am supplying the...

My book states that Heat and work represent energy in transit. The state of the system undergoes a change after heat is supplied to it and before work is extracted from it because energy gets stored in it. My doubt is here that ,heat has been transferred to the system and it says heat is energy...

Interesting article sent out by Digikey just now...

Is there some common parameter for DC power supplies that provides the maximum oscillation amplitude allowable at the output? For some context - I would like to generate an oscillating signal powered by a DC power supply, but to prevent most of the oscillations reaching the DC supply I am going...

I have a 30V 5A variable linear power supply, which has failed twice from transients killing the LM358 quad op-amp IC that controls the output. These transients are from driving things like a car ignition coil, for making an electric fence energiser. Simply replacing the LM358 gets it going...

I am searching for a legible schematic diagram for a Tenma 705-72 DC laboratory power supply. Each of its two channels uses a LM723 regulator and a pair of 2N3055 power transistors. One of the channels operates normally; the second channel puts out the maximum voltage (37 volts). Any help...

I am trying to understand the working of simple hydrogen fuel cell. We have anode (negative terminal), cathode (positive terminal), catalyst at anode to separate negative and positive ions of hydrogen atoms and electrolyte which allows only positive ions. We will be sending hydrogen fuel at...

Homework Statement Can we use a 3 phase delta supply to a 3 phase synchronous motor who's stator windings are connected in star (wye)? The Attempt at a Solution I was thinking no, since I read in my notes that the rotor has to be supplied with a "continuous current" But I'm not sure. I have...

building a DC supply with a load voltage of 3.3V and load current of 3.3mA. all the books and schematics I'm seeing is that they're putting the fuse in the primary of the transformer, why? if i were to fuse the primary as well how do i get the rating of the fuse that i'll need? its said in my...

I am taking a my first water management course and I need your help getting through my first Water Supply Reliability Modeling assignment. It involves a data set that I must manipulate and a problem set. I am not a civil engineer, so I do not know where to start with this. The only hint I have...

Hello, In my textbook, I read that the preganglionic fibers which supply the thoracic viscera originate in the lateral horn of the upper 4 thoracic segments. I read too that the the preganglionic fibers which supply the head and neck originate in the lateral horn of the first and second...

Homework Statement Design, giving the necessary ratings and characteristics necessary for the transformer, bridge rectifier, reservoir capacitor and regulator, a 12 V, 2 A regulated power supply. Also identify any heat sink requirements. The available mains supply is 230 V ±10% @ 50 Hz...

First off I'm not an engineer nor do I have a electronics background. I have an old Linear (HP 6284A Power Supply). I would like to be able to display Hz/CPS. I need to measure the speed of a tattoo machine. (basically two coils that make and break connection through out its use. From what...

Lavolta BPS 305 0-30V and 0-5A. I was showing a young lad how you can energise a car ignition coil and get a spark on the output, and that this effect can be improved by adding a cap in parallel which forms a crude LC oscillator etc when the unit died. Silly, I know, but we got a bit carried...

what is actually happening when an Inductor is connected with an ac source.(i mean at the very instant of connection is made).i know emf will be induced due to change in current.(curl of E is =-time derivative of B)here my confusion is,inorder to induce emf,current should flow first,then who...

I've got an old laptop charger 19v 3A for my solenoid. I used a multimeter to check the charger without and with load. I used a solenoid of insulated 22gauge of approx 150 turns as the load. On my first try without any load, it gave 20v DC on the multimeter. When I connected the load and...

Hi, Out of interest, today I was mucking around with a 160W LED, 240V, 50hz, outdoor light. I looked at the Power Factor (it was 0.96) and the THD was 14.something %. I then wondered what would happen if I put a capacitor in parallel with the light. It was a three phase 90uF cap, so since they...

If gravitational force is caused by a particle (tensor boson) which is massless and so travels at c, why doesn't matter ever exhaust, or even seem to reduce, its supply of these particles?

For a project,we thought of making solenoid engine. We made everythig by hand, including the DC power supply. The power supply worked very well, it's puts out like 20v 1A, and it was fine still after testing it for a long time connected to DC motor. When we connected it to a solenoid coil...

Hi, For my project I am plotting a Force vs Displacement graph using 2 analog inputs which are going to a DAQ. The two analog inputs are coming from; -A 5k potentiometer (for the displacement) -A 1000 lb load cell sensor (for the force) I would like to use a regulated 12V DC (1Amp) power...

Homework Statement [/B] Im working through my HNC with the answers but i do not know how they have come to the numbers below.Total load = 1.5/-60 degrees + 2.3/-18 degrees. =(0.75−j1.3)+(2.19−j0.71) 2. Homework Equations . Not sure yetThe Attempt at a Solution I understand how they have...

Voltdrop calculations are made as shown below. Total loadLine currentI=1.5/−60∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯+2.3/−18∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ =(0.75−j1.3)+(2.19−j0.71) <<< (How to get to these numbers only from above??) =(2.94−j2.01 )=3.56/−34.4∘⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯MVA

In this project, I am using the https://www.amazon.com/dp/B005W09XYW/?tag=pfamazon01-20 as a power supply, but in my project, if my device shuts off suddenly without shutting off properly, it would require me to reboot the entire system as it won't work anymore. So I decided to use this power...

I have a 2 AMP regulated DC power supply, with variable voltage 3 - 12 v. If in a small circuit, i.e, small copper wire with 1 ohm resistor. Why am i not getting at max Amps?

Hello, Certain power supplies can be both a voltage source or a current source. a) Voltage source: We set the voltage to a specific value we like and change load resistor. The current will vary (get smaller for larger R) but the voltage will not vary. To make the power supply a voltage source, I...

Picture for reference is below. I'm confused as to how this is able to receive a differential voltage of +/- from a single power supply. (Yes, I know the picture says dual power supply.) Normally I have to short the negative to ground on one side of a dual power supply, and short the positive...

Homework Statement So, for a school project I have to make a resistance soldering iron. As far as I know, this requires a high current going through high resistance wire (such as stainless steel in my case). I need to make this run from a standard 120v 15A wall outlet. I have figured out so far...

Trying to build a simple 9V power supply using a 7809 voltage regulator and full wave rectifier. The load current from the regulator is 1A. So I = C*dv/dt, therefore, C = I*t/(delta V) To my understanding t is the time between the two peaks or the time the capacitor supplies the load. So if...

I am using arpack (the dsdrv1 driver) to iteratively solve the eigenvalue problem Ax = λx I am interested in the first m eigenvectors, and I have very good initial approximations for these vectors, so I would like to use my m starting vectors as an initial guess. However...

Wanting to know if it is possible to power a LED with a forward voltage of 29.3V and forward current of 440ma from a 1.5V source with a 2400mAh Capacity? No particular need for this, more for challenge/knowledge. Have tried methods with a transformer, DC-DC converter, and lm350 constant...

What is required to bring hydro lines on towers together?

I have a ton of 3.7 volt lipo's at my house, each of which can be charged @ 5C, and since each have a capacity of 270 mAH, than I should easily be able to charge them @ 1amp. I put 8 in parralel with each other so it is a 1s, 8p battery pack. each of the lipos is the same (in tems of specs, ik...

Hi all, I've just watched a video about the problems of back-feeding your home with an inverter/battery source, most of which relate to the split-phase system in the US. It got me thinking about the differences between this and the UK (and EU) mains supply, which is single-phase 230V. This...

Homework Statement A newspaper article stated that the NASA Galileo space probe to Jupiter 'contained 49 lb of plutonium to provide 285 watts of electricity through its radioactive thermonuclear generator (RTG)'. (Note: An RTG is a device for converting thermal energy produced by fission into...

Homework Statement So the circuit drawing is in this link http://i.imgur.com/jVYm5La.jpg . Basically, we have to create a power supply circuit and using Livewire and PCB wizard program in conjunction, I created this circuit Homework Equations None? The Attempt at a Solution [/B] I can't...

I designed one transformerless power supply and did lots of calculations for that. can anyone answer me how to calculate value of capacitor using as a smoothing capacitor parallel to zener.and also tell me if the value of capacitor is larger than required then what changes may occur in the...

So many moons ago I made myself a pretty bog standard dual linear bench power supply using an LM317 and LM337 to give me -15 - 0 - +15. In an attempt to get more current out of it (for no real reason other than because I can) I got a larger transformer and a beefier rectifier, then using the...

Homework Statement Specify ratings and values for the transformer, bridge rectifier and smoothing capacitor for a 230 V unregulated power supply with an output voltage of 12 V, output current of 2 A and a ripple factor of <0.024 Homework Equations V * I V*sqrt 2 C= I/2f*Vr Id=(1+sqrt2)*ILThe...

https://en.wikipedia.org/wiki/Drinking_water SunToWater Technologies's units turn moisture in the air into drinkable water http://www.dallasnews.com/business/technology/headlines/20160810-with-new-water-generators-carrollton-startup-can-unlock-the-ocean-above-your-head.ece...

Hi guys, Here is the amp schematic, http://www.classictubeamps.com/schematics/Marshall/1966%20JTM45.pdf Here is the power supply schematic I would like to modify and use. http://imgur.com/a/sdYAV I don't know how to get both of these schematics to display in this post...I guess I will never...

I can't get my head around question about energy consumption, energy supply and run-time. I think I forgot (Im sure I forgot) something in my equation. I am trying to find a way to calculate for how long could UPS supply my PC I don't know why I can't find Amp-hours of UPC on it but let's assume...

I have been having trouble calculating the value of the voltage supply. From what I have learned, to calculate the value, it is V= I x R. I have already calculated the value of R2 as the problem asks, but how do I find the voltage supply if I only know the resistane and the power being...

I recently salvaged a Melles-Griot HeNe laser from an FTIR system. I neglected to save any of the electronics except for what I think is the step-up transformer attached to the laser tube. The laser is "05-LSC-708-540" and the transformer is "05-LPM-850-045". I have a 12V power supply, but was...

What is the voltage leaving the rectifier? What is the voltage at the two 22 ohm resistors? What is the effect of the 4.7 volt zener diode?

Hello all. I'm pretty disorganised and not very clever so I thought I'd ask you all... If you charge an electric car from a power station run on fossil fuel is it cleaner than a petrol car? I'm wondering after looking at the energy loss in converting fossil fuel to electricity and then in...

Homework Statement FIGURE 3 shows part of an electrical supply system. Draw the impedance diagrams reducing to a single impedance. Calculate the fault MVA levels in each unit for a fault on the left 3.3 kV bus with the bus section switch B open and A closed. Use a base MVA of 10 and show...

Homework Statement When the internal resistance is large in comparison to the external resistance, the terminal potential difference falls to a small value. This is used to make high voltage supplies safe for use in a laboratory. Explain how this makes the supply safe. Homework Equations...