Power

The kiosk has a 250amp Circuit breaker. It's 25m away from the DB. From the DB to Machine it's 80m the machine has a load of 160AMps. How do I calculate cable sizes for both?

I wanted to share a cool tool we discovered when enaging with Maxim Integrated last year. If you're new to DC-DC power design and are looking for a tool to speed up your design, you should check out EE-SimHow to Design a Power Supply in Five Minutes or Less with the EE-Sim Online Design Tool https://www.rs-online.com/designspark/how-to-design-a-power-supply-in-five-minutes-or-less-with-the-maxim-ee-sim-online-design-tool         

Power supplies driving "normal" loads are generally straightforward.What are the requirements or pitfuls of using a switch mode PSU driving a pulse width modulated speed controller with a PM motor load?I assume during start-up and running with and increasing motor load is just typical loading, but what about when suddenly reducing the motor loading, could this cause problems with the back EMF generated?

Hi, I have to control speed & direction of dc motor in an embedded project, so I can't use any ready made modules so we have to design it using PIC16F877a, I am done with its programming but I am stuck at h-bridge as I don't know what should I use here. I first had a look at FET & MOSFET but finally landed on IGBT. I think IGBT is best for this application as they are fast switching ICs and I want to control speed so I have to use PWM. So, can anyone suggest me some easily available and low cost IGBT IC? The one I have found out are not available in my local market. Thanks in advance.

Hi I need to find a power supply for a project i am working on this is a completly new area to me so im a little stuck. I am designing a nano bubblepropeller for a reasearcher and have secured a motor and controller but i am a little unsure when it comes to choosing the right power supply. I will attach the motor and controller spec and a drawing of the propeller. I thought this power supply would work but i am still unsure. RS Stock No.: 837-1436 Any help would be greatly appreatiated. Thnaks   Si

Hello everyone, I am here with a very confusing question. I have a theoretical submission on Star Delta Transformation and I have read many topics online and have cleared my concepts but the thing is I couldn't find any practical applications of it. I mean we use it for converting Star design to Delta but someone could refer me any of its practical application i.e. why we use it? & How to use it in complex circuits. I have just seen calculations like formulas Derivation etc. here's one example, which I like the most, What is Star Delta Transformation? but haven't seen any practical circuit solving. like multiple branches of resistances in star format and then solve it by transforming it to delta or vice versa. Any kind of help will be highly appreciated.

I am buying a piece of equipment from the US and need to source a 15v AC power supply capable of supplying at least 5amps current. The Nuvotem toroidal transformers looks possible. But should I configure a 80VA with 2 outputs connected in parallel to provide the required current OR buy a 160VA version, just using one of the outputs? Any thoughts appreciated 

Good morning, i am writing because i would like to ask you for some more information about heaters. In short, we have a chamber and we are going to do thermal cycling tests inside of it.    For this purpose, we need to bring the temperature in the chamber from -35c to +50c.    To warm up the room we need to choose electrical heaters with a small thermal mass and that are safe for temperatures around -35c and resistant to moisture. Of course, we will make the heaters work at 0c and not at lower temperatures.    Could you please help me to figure out the most suitable solution? Thank you in advance.

I have ordered some lifepo4 battery prismatic cells from Evlithium, they are 3.2V 200Ah CALB Battery cells. How do i make a DIY LiFePO4 Battery pack with BMS?

I have a Sony TC377 Tapedeck (1973 Apx) and i want to replace the motor run capacitor, the one that is on there is an aluminium can type about 30cm x 60cm. The rating says 1.5uF and 0.5uF it has three terminals one is bridged, it is a 250v A/C. Does it matter if the repacment is higher than 250v and is this a permanant split capacitor or can i just replace it with a 2uF?       I have looked on your wedsite and have pick out 3 possibles. R.S.Pro 196-4646.  Kemet 377-8740.  Epcos 200-9283. Can you recomend one. Thanks Mike

I have a general question about a boost converter. I am following the components recommended by the manufacturer. However, the recommended coil package is large and I was looking for a smaller alternative. The alternatives that I found, have different characteristics in resistance and resonance frequency.   a) If the DC resistance of the coil is greater, what are the implications?   b) If the resonant frequency is lower than the recommended component, but still higher than the operating frequency of boost converter, is there a problem? I don't think so, but I would like to hear an opinion.   Thanks.

Hello, Total amatuer here :DAs a hobby, I have recently been getting into LED projects and I am using block PSU's like the Meanwell. The LEDs require power injection at multiple points in a single project.The PSUs can supply from 30 - 60amps but I need a way to be able to connect that supply to the multiple points around the project - I need some kind of power distribution block.I have searched and searched and have had a lot of trouble finding something. Lots of terminal blocks seem to be just a way of linking wires together on a 1-1 basis :(Can anyone tell me if something like this - https://uk.rs-online.com/web/p/distribution-blocks/7055537/   would do what I need? Its called a distribution block but looking at it I'm not sure if will actually do that (take the power and common line from a single source and connect it to multiple outputs).If this won't do that - what do I need to look for because I have run out of ideas for search terms :PThanks!

Hi all beeen advised to have a look on here  I am buliding a campervan and requrire a changeover switch so I can run 1 outlet 240v and have two suplies coming in ie 240v hook-up / 240v from my inverter  I was told I require a 2 pole change over please advise and thanks in advance Stay Safe Jimbo

Seeking advice on producing a unit to install between a 6volt 1watt solar panel and 4 to 12Volt 4 watt max submersible water pump. Currently water feature will only operate when solar panel is in direct sun. Want to have better control of water feature operation.