Supply Definition and 515 Threads

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...

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...

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...

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...

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...

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...

"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...

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...

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...

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...

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?

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...

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...

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

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...

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.

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

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...

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

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

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...

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...

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...

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...

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!

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...

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

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)?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

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...

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...

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...

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.

anything?