Can someone explain me the working of this boost converter and the function of individual components. Please. I am unable to understand.  Why are the transistors connected to the MOSFET. What purpose do they serve?   Can someone explain me one cycle of the output current path, please?    The data sheet for IC1 can be found
I am using this IC in boost converter configuration :   It steps up the voltage from 16.5V to 23V.   It drives a load current of 270mA.  I need to calculate the input current of the converter.   I understand that output power/input power is efficiency.   Since I know the output power, can I take the efficiency value from the graph 21 of the attached datasheet (86.8% approx - obtained from fig 21 graph) and find the input power?   With the input power, and since I know the input voltage, I can calculate the input current.   Is this the right way?   And I want to check if all the components at the output of the IC are properly rated.   Which parameters and components should I check and how to check?    Sorry for the poor image quality. The two transistors are taken from the SWE pin.
How can I use variables in the LHS and RHS of a sed substitution? How to declare a variable inside bash -c I can't figure out how to declare a variable inside bash -c command.   bash -c "var=3; echo $var" Is $\frac{\textrm{d}y}{\textrm{d}x}$ not a ratio? Weird behavior when overriding gnome alert styling? After playing around with the i3 tiling window manager, I had my fill and decided to uninstall it and continue using gnome. However, to my dismay, something in i3 overrode the default gnome alert box. For example, when connecting to wifi, I get a gray or blue box instead of the nice ubuntu popups. The screenshot says it all. Any ideas?    (See top right corner) Is it possible to have the Corruption and the Crimson Biomes in the same world? I was reading on the wiki how there is a chance that the Corruption will be replaced with the Crimson.  I am wondering if when you get a world where you have the Crimson is it possible to also have the Corruption if you bring over corruption seeds from another world and use them. Or would these seeds just get you more of the Crimson? I finally got fed up when wanting to read about bash's read and it's -s option with man bash. I found the right spot eventually (around line 4500), but it was a frustrating as usual, since both /read and even /\s-s\s searches have way too many matches.  So, the question is: How can I read long man pages efficiently, or get same information in other ways, locally? As a specific example, how to reach the relevant documentation after seeing read -s pwd in a shell script? A good answer could be a shell script snippet, or hint about some tool and how it is used, or something else entirely, as long as it helps in finding the right spot to read.  Note: I'm not tagging with  because I want the question to be about man page reading in general, even though that quite possibly is the most commonly encountered humongous man page. Erf as term for plot of land in a town or city. Is this word only used in southern Africa? What's recommended for the number of users to use in qualitative and quantitative testing? I have the following code for my masterpage:  &lt;%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %&gt; &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;  &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server" style="position:relative"&gt;     &lt;title&gt;Masterpage&lt;/title&gt;     &lt;asp:ContentPlaceHolder id="head" runat="server"&gt;     &lt;/asp:ContentPlaceHolder&gt; &lt;/head&gt; &lt;body&gt;     &lt;form id="main" runat="server" style="position:relative"&gt;     &lt;div&gt;         &lt;asp:ContentPlaceHolder id="MainContent" runat="server"&gt;         &lt;/asp:ContentPlaceHolder&gt;     &lt;/div&gt;     &lt;/form&gt;     &lt;br style="clear:both" /&gt;     &lt;form id="footer" style="position:relative"&gt;     &lt;div&gt;         &lt;center style="font-size:small"&gt;Footer content&lt;/center&gt;     &lt;/div&gt;         &lt;/form&gt; &lt;/body&gt; &lt;/html&gt;   My problem is that when the MainContent isn't filling up the page the footer is not at the bottom of the page. Is there a way to force the footer to stay on the bottom of the page if the main content isn't pushing it all the way down? When the main content is "big" enough it pushes the footer down with the content and displays on the bottom when scrolling down, but not if it is to small.  Anybody know how to fix this? What is the fastest way to get from Courmayeur/Aosta to Milan? We will be crossing the Italian/French border through Mont Blanc via cable cars, which we heard through Rick Steve's article: .  We will be starting off in Chamonix and arriving in Courmayeur. What's the fastest (and relatively cost-effective) way to get to Milan from Courmayeur? Why does the Euclidean algorithm work for polynomials? What is the proof? Do 'learn by heart' & 'learn by rote' mean the same? Here in India, both the phrases learning by heart and learning by rote are taken to have the same meaning, i.e., blind memorisation without true understanding.    However, some sources say that to learn something by heart implies that one knows something so well that it has been thoroughly internalised and imbibed.    So is it wrong to conflate the two? Find unique rows in numpy.array Windows file copy dialog: Why is the estimation so... BAD? I know that the Windows copy dialog (in Windows&nbsp;XP) stores the copy in memory first, and it is still copying after the dialog closes, so the time is off, but why is the estimation of the time it will take to make a copy so inaccurate, even when memory copying has been disabled (in Vista and Windows&nbsp;7)? It seems so arbitrary! How does the whole copy procedure work, and why can't Windows estimate it correctly? Can a new save withdraw from the pokemon bank? I've been considering restarting my save and replaying the story with access to the entire National Pokedex (Minus a few Event-only Pokemon I'm missing) from the start. But I would first like to confirm: Can I withdraw my stored Pokemon from the bank if my game is reset? It seems that the only contributing factor is that I end up signed in with the same Nintendo Network ID, so as long as my network ID remains the same, I can withdraw stored Pokemon regardless of what save-game or cartridge is in my system, correct?  While I'm reasonably confident it works the way I think it does, past experience (My Pokemon Ranch being tied to specific trainer IDs, and something about the dream world being tied to the game's wireless settings) has made me just cautious enough to ask before attempting. What do the symbols in service --status-all mean? I really miss the graphical "Services" tool from older versions of Ubuntu, but I understand why it had to go. I always have terminals open anyway, so I use (because I have to now, I guess) service --status-all to see what services are running. This would be ok except that the command produces output like the following:   [ + ]  winbind  [ ? ]  wpa-ifupdown  [ - ]  x11-common   I'm guessing that those symbols mean something like listening, blocked, or stopped, but which is which? More importantly, why doesn't the man page say? Getting always extra button on display .. 1 button dont have any ID I am having problem while looping.  I am always getting an extra button. Please help.   {this.state.items.map(myitems1 =&gt; {     return (        &lt;div key={myitems1.Id}&gt;            &lt;span&gt;{myitems1.Item_x0020_Name}&lt;/span&gt;            &lt;button onClick={e =&gt; this.dosometing(myitems1.Id)}&gt;Offline&lt;/button&gt;        &lt;/div&gt;     ); })}   I can see the collection has only three (3) values, But I am getting 4 buttons on screen.   Getting always extra Is there a general formula for image size vs. print size? Is it possible that galaxies' redshift is caused by something else than the expansion of space? I was thinking that maybe photons loss energy naturally when they travel great distances.  Or maybe the mass of all matter is increasing over time and therefore photons emitted in the past are necessarily less energetic.  Or is the expansion of space backed up by so much other evidences that trying to find another explanation is completely foolish? Inspired by  I was wondering why the Half Blood Prince left his book as a class copy. One would think that it was precious to him, since he invested so much in it. He made up potions and spells up by his own. I would expect him to keep it to himself. Both, because of the personal value of it, and to prevent others to (as happened at last) use his work (misguided and/or against him).  Is there any canon explanation why his book was left as class copy?