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Are Pixels square? Answered

I'm trying to scale a graphic I downloaded from the internet. The program I'm using (HP Photosmart Studio) tells me that it's 426 x 1024 pixels, which gives me an aspect ratio of 0.42:1. But in inches, it's 5.00 x 14.22, which has an aspect ratio of 0.35:1. So either I'm blowing the math, or I'm losing my mind, or pixels aren't square. (Why, in the name of anything at all, woud pixels not be square?)

Question by Gorfram    |  last reply

The Square Root of NET?

What is the square root of the internet?

Topic by RelyNupon    |  last reply

What is distinct square? Answered

Give me a description of what a distinct square is in geometry

Question by Xixfas    |  last reply

how to crochet a square?

Squares to make up a blanket

Question    |  last reply

Square wave inverter?

I am building an inverter that will use a square wave pulse to drive MOSFET's at 50-60Hz. I have read and heard a lot of stuff that running square wave into a transformer is not a good idea, what I want to know how bad is it? Also will adding capacitors as seen in my image be able to smooth the square wave a bit to help the problem? If so what capacitance should I use? (About 200A input) (The 12V square wave is coming from paralleled MOSFET's)

Question by The MadScientist    |  last reply

Square water melon

How should I know to create the correct dimension of the case for a 7 (16 lbs), 8 (18 lbs) and 9 (20 lbs) Kgs of watermelon? In the instructables didn't mention the dimensions for each watermelon. Could you please send me your comments? Thanks

Question by Lolius    |  last reply

Laser square projector

I work in a manufacturing facility and we've got a lot of forklifts that are buzzing around everywhere all the time. there's an initiative to make it safer for forklifts to interact with pedestrians. one of the ideas someone had came from another facility where they have these blue spot lights on top of the truck that project a blue dot in front of and behind the truck. you see the blue dot and you know a truck is coming. there's some concern that this might get missed by a pedestrian. a thought came to me, being a nerd, that we could use something maybe a little easier to see. I looked in to some disco type laser displays that you can display custom graphics with, but there's concern about how sturdy they are or how long you'd actually be able to use one (whatever it is would basically have to be on almost 24/7). we've got several Motorola barcode scanners, and the long range models (mc 9190) have a feature where it projects a red square to show the area where the scanning will take place. it's a solid red square, not just a perimeter, that scales up with distance (it's like 4"x4" if you're within 2' and goes up to a pretty large size the farther out you're pointing it). These scan guns are way more expensive than this project calls for of course. Does anyone know of a source for JUST the imagers for these things? or could anyone suggest a way to replicate the effect...a big red square on the floor, with other equipment. needs to be able to run for a long time, hopefully could be powered by a 24-36v DC source, possibly motion detection (though not really necessary)

Topic by crapflinger    |  last reply

Cutting a square hole? Answered

This is a really basic question—I have managed to get to 66 years old and still be a complete handyman novice, I have tried but my best efforts are lamentable. I think it is because I have never had anyone to show me handy things and have never asked anyone so turning over a new leaf I am determined to start making a few things instead of spending a fortune buying them and paying people to do things for me. My first project is to make a simple slide carrier and I have bodged one up in cardboard but it really needs to be in something stronger so it is rigid, metal would be ideal but very stiff board would also do if I can not cut the metal. I do have a thin sheet of aluminium, (from the casing of an old laptop) that I would like to use buy am frightened of messing up & worse injuting myself! I now realize that I have no idea how to cut a square hole in a piece of metal or, for that matter, what tools I need to cut aluminium in the first place! My overiding consideration is to be safe so I don't want to try, (what to me is a daunting task but probably to you guys the simplest of things) not knowing what I am doing. So can someone please help me out and tell me what tools I need and how to go about cutting a square hole in a piece of metal? Rest assured I will not do it if I do not think I can safely. Thanks.  

Question by Allsop    |  last reply

Square wave DC transformer Answered

If I was to feed a dc square wave into a transformer would I get a dc square wave as an output?

Question by workinprogress37    |  last reply

What is the square root of -2? Answered

 I need to prove my math teacher wrong

Question by bendog38    |  last reply

Square Brackets in Back Talk

Hey Dev Team This isn't exactly critical... But when you've got a moment to spend a few cycles on, superuser me and check out my backtalk page. Any projects with a square bracket (probably with the first char only), messes with the UI and puts a red box around that field. I used square brackets when I did those collegiate meal projects.... Happy new year :)

Topic by trebuchet03    |  last reply

Question on attaching the round to the square.....

I need to attach a tube (it is fairly rigid, like a bic pen body), to a box (coming out of the smaller end of the box) and it needs to be fairly secure as there will be wires running through it and a "pickup coil" attached to the end of the device. The box may be plastic, or it may be metal, I haven't decided yet. I had thought about threading the barrel of the tube and just using two nuts to lock it in. Any other ideas would be greatly appreciated.

Topic by Goodhart    |  last reply

Square tubed sign post with holes?

Hey all, I'm in warren Michigan area. I found a great place for some decent sized scrap hardwood like maple, oak, cherry. Sometimes walnut or other more exotic types. North of warren in Fraser there is a cabinet company called audia, in the back they have a large amount of 1-1/2" wide X20' lengths! Also, a place called laired plastics has an assortment of different color, sheet plastics various thicknesses as well as blocks of white plastics. In the back they have several bins with different material in each one...  Now, i need a place to get square tubing with the holes in them. I need about 12' of it but i don't need any piece longer than 1' anyone know of the business types that would specifically deal with this stuff? I see them knocked down by cars very often, i can work with those! Lol i just need to know where to look to find them. Google has an overwhelming amount of suppliers, but i don't need long sticks i just need some scraps... Call me cheap, buti would like to find them for as free as possible!

Topic by SlickSqueegie    |  last reply

Schematic needed for square wave generator.

I need a schematic and the code for a square wave generator, with the following specs (although it is a bit specific) Repition Rate (external trigger, 20 Hz 200 Hz 2KHz 20 KHz 2 Mhz and 5 MHz) controlled by a rotory switch. a vernier (pot) controlling pulses per second.) a single shot button (N.O. push button) external trigger (BNC Connector) Delay (Rotary Switch)  .1, 1, 10, 100, 1k, and 10k microseconds Vernier (pot) for the delay a sync output (BNC Connector) with a toggle switch for polarity. double or single pulse on the output (toggle switch) polarity selection on the output (toggle switch) gate on off (BNC connector and toggle switch) 10db step (on or off toggle) 50 ohm load on or off (toggle switch) rise and fall time (pot) Any help would be greatly appreciated, as this is a bit specific. I only need a schematic, and everything else i can take care of. Once again, Thanks for the help.

Question by mchp82    |  last reply

5-6mm square Paper Shredder???

Is there such a thing out there in Shredder-Land that makes squares about 5-6 mm?  

Question by Timbershine  

Ways of joining square aluminium profile

I am designing a 3d printer using standard square aluminium profile (mind you not t slot or v slot, plain square section). What are the ways in which aluminium can be joined such that the joint is rigid and have decent strength? I don't want my printer to become wobbly after some time.

Question by SIDDHANTS3    |  last reply

pixel squares showing up on the screen?

I built a projector using an old carousel slide projector and used a MP3 player for my LCD screen. It works Ok except that when I focus the picture the Squares from the LCD screen are really noticable. Is there any way to make these disappear or, at least to minimize them so they aren't as noticeable.

Question by adh    |  last reply

How to make 4 square court?

I am planning on building a 4 square court for my camp as a service project. I plan on it being 12 feet by 12 feet and 4 inches deep (if that is sufficient) , Built on top of 3 inches of pebbles and in cased in a 2 by 4 frame. If you are unfamiliar with the game it is sometimes called hand ball (WIkipedia page) my questions are.. Do I need to use rebar? Are my depths sufficient for the size? What type of pebble am I suppose to use? Would it be stronger of i built it with 2 by 4 running across where the lines would be for a 4 square court (center of each side to the center) ? Would a 4 person team using shovels, wheelbarrows and brooms be enough for the job? And any other advice?

Question by zigzagchris    |  last reply

How to square wave ---> triangle wave?

Currently I have developed a flyback driver that is a semi-cross between a classic ZVS circuit and a 555 type driver, mainly just using a few comparators (one to create a triangle wave and 2 others to respond to the upper and lower peaks and drive MOSFETs. This allows me to create a modified sine wave with adjustable duty cycle.) This topology is even more powerful than the ZVS driver at 12V, as I got some INSANELY thick arcs!! However the MOSFETs get a little too warm, and I was forced to use sil pads to galvanically isolate the drain from the CPU heatsink. They seem to have really poor thermal characteristics as the heatsink stays cold while the transistors get uncomfortably hot within seconds!! To make this thing operate at the resonant frequency of the flyback, I think I will a feedback coil that would get "squared up" using a resistor and zener diode. I need to convert that signal into a triangle / sawtooth wave of fixed amplitude. A simple RC type circuit is not too suitable because as the frequency goes up or down, the amplitude of the voltage across the capacitor changes proportionally.What circuit will allow me to convert a square wave directly to a triangle wave of fixed amplitude????

Question by -max-    |  last reply

Where can i get square aluminum tubing? Answered

I would prefer not to order off of the internet unless free shipping was available.?

Question by Herbal_T    |  last reply

need to design something that will cut paper squares 4 inch by 4 inch

I am using cardboard, heavy paper stocks and photo albums and trying to design/create something that will cut individually a 4 inch by 4 inch square into the centers of all these different stocks of paper/cardboard. I thought about using a dremel but it would take entirely too long. I even thought about a die cutter but cannot find one for a square in the size of 4 inch by 4 inch. They do have machines (crafting) however you have to pass the material underneath the machine and the crafting machines are not wide enough to pass through a 8.5 wide paper. Any ideas would be helpful thank you. Even the photo albums arenot really that thick less than a quarter inch thick however it is still 8.5 inches wide. Need to design or make a press, a handheld punch or something that will be easiest to cut a 4 x 4 square out of the center of the material. I have seen up to a 2 inch punch and from reviewers even the 2 inch craft punch does not work that well for 27.00 and I need at minimum 3 inch by 3 inch but prefer 4 inch by 4 inch square. thanks

Topic by gowery    |  last reply

Can I pay just one month to test

I would like to pay one month to make sure if the information is going to help me. I need the instructions for the square water melon. Could you please tell me if I can do it? Thanks LG

Topic by Lolius    |  last reply

Uploading something made using an instructable as a guide? Answered

Basically, I am currently working on a project using an instructable as a guide. I'd like to share what I've got afterwards, but I'm not sure if the "Photos"-submit-function is supposed to be originals only, or not.

Question by Skelpolu    |  last reply

How do i add a text square?

In a instructable people put a little square and when you roll over it it shows text

Question by creat0r    |  last reply



Topic by pebbles1    |  last reply

555 timer - 1200hz square wave generator?

I would like to replicate the Hitechnic IR Beacon.  Essentially, this means that I need to create a 1200hz square wave.  I would like to do this with a 555 timer, a 3v power source, and infrared LEDs (1 - 3).  Please offer any suggestions you might have.  This will work in conjunction with the Hitechnic IR Seeker and an NXT Bot that I will program in RobotC.  Thank you.

Question by raykholo    |  last reply

Square Capacitive Touch RGB LED Buttons

I'm having a hard time finding parts like these - is anyone aware of an RGB LED capacitive touch button?  Preferably with the light and the touch sensor separate (DPDT-type, perhaps?).  I'm looking to make a physical prototype of a mobile puzzle game I'm working on, and this would be an ideal input method. Thanks! -Jesse

Topic by xepherys    |  last reply

Anyone Have experience with Adafruit Square FSR?

I am hoping to create a circuit that will variably control the speed of a motor through pressure. If I were to wire up one of these , simply as the switch between a small motor and a power source around 5v, would it work to simply turn the motor off at rest and vary the speed with pressure? Is there a way to use this resistor as a "switch" without using an Arduino or  other micro controller? Any help is appreciated. Thanks! 

Topic by Flashflint    |  last reply

Schematic-reading problems ( Square wave oscillator )? Answered

Well, I try to follow an instructable for quiet a while now, but I still couldn't understand its schematic .. its not that I don't know what the symboles mean, but I dont understand the connections - Those arent physical-connections, but still ... The instructable: The Schematic: It's all over the place! There are 10k resistors appearently and 1 more resistor ( I can see 3x 1m resistors ), but he didnt mentioned those in the instructable. I'd contact the instructable-author, but he's a student and has thus no time at all. If somebody has time to explain this to me, or yet better, just mentioning the connections in english, I'd appreciate it very much. This is driving me insane. ._.

Question by Skelpolu    |  last reply

How would one go about making very small square holes a thin piece of metal?

I'm trying to modify a bracelet that's made out of some very, very thin metal, and I need to make several small square holes all over it. By small, I'm talking 2mm x 2mm small, and they have to be noticeably square shaped. Is there any cleaner way to do this than trying to drill a small hole and using a super small file (if such a thing exists, haha)?

Question by Ingulit    |  last reply

What do you think of this circuit?

I made a few changes to a circuit, since it's the first time I do this I'd like to know what you think and if there's anything I should change.

Topic by pquadros    |  last reply

turn a square wave froma 555 into a sine wave? Answered

I would like to know how to smooth out a square wave to turn it either into a sine wave or at least a triangle wave. Or if it's not possible i would like to know how to make a sine wave generator to use as a lfo thing for a home made synth. Thanks, Josh1324 PS. It has to be analog, im not getting into microcontrollers or anything digital.

Question by josh1324    |  last reply

Square Wave Generator (For Resonant Air-Gap Transformer)

I've decided on a project for the new year that is ~~less likely to lead to sterilization~~ better than my old project (which was a homebrew x-ray machine). My new project is something to wirelessly power some LEDs. I've done some research (read as, YES NACHO, I ALREADY GOOGLED IT!) and looked at puffin's unfinished instructable on IPT (it helped a lot). What I've found out is that to start, I will need something to generate a square wave AC signal. The circuit I decided on is a 555 multivibrator. One of my friends let me copy the schematic from his notebook. I've got a couple of questions still (and I hoped you guys could help). 1st. (Dumb Question) That symbol in the second picture is ground, right? 2nd. Once I build the multivibrator, how would I hook it up with the rest of the circuitry for my air gap transformer? (ie. where would the outputs on the circuit be?) 3rd. What does that symbol (it looks like it should just be a resistor symbol), next to the words speaker or other circuit mean? Is it just a resistor or is it actually the outputs I've been looking for? 4th. Is there anyone who has successfully done a project like this before (recently)? Thanks in advance for any help.

Topic by Gjdj3    |  last reply

How do I make a Square Wave Generator? Answered

I need to make a square wave generator for a project. Does anyone know how to build a square wave generator that can generate a frequency 100-150KHz? 

Question by Mr_Electric    |  last reply

LED battery charged square polypropylene tubing. Help?!

I would like to construct clear polypropylene tubing into about a 20 inch by 20 inch or smaller square with led lighting inside for hula hoop performance (hoops known as squoops-- square + hoop). It needs to be battery powered and evenly distributed with weight. Needs charging capability and little to no battery gap. Can anyone explain what I would need? Or the best places to buy unique led colors?  I am not very tech friendly :( Any help would be greatly appreciated! Thank you :)

Topic by blurhoops    |  last reply

Grow 100 lbs of potatoes in 4 square feet

Learn how to grow 100 lbs. of potatoes* in a tiny plot with some lumber, potato seeds, and some careful watering. When I move into a new place where I can finally put my garden this is one idea I'd love to try out and see if it works.And then I will be the Spud King of my neighborhood, giving potatoes to all the kids for Halloween because that's a lot more than I normally eat. Link via Lifehacker*45 kg in .37 square meters for everyone else

Topic by fungus amungus    |  last reply

5w Square Bright-White LED : Glow or Blow…??

Q: Glow or Blow…? Dear Friends…„ I dont know more about electronic and its power supply/consumption of electronic component. Recently, I seen and bought two components… (1) 5w LED (Square/White)  - Requires 9v ~ 12v DC (2) 1 Circuit Board (Readymade) Open LED Driver This Board has : 1x 474K 450v Polypropylene Capacitor 1x 1m Resistor 4x 1N4007 Diode Bridge 1x 100Ohm Resistor 1x 6.8uF Electrolytic Capacitor Nicely assembled. Open LED Driver run on main AC power of 230v. I havent test, connect and glows this 5w LED using this open board. I have tested this LED with 12v 2A LED-Driver…„ which was bought with LED-Strip at Diwali Festival…„ but with this 2A Driver this 5w LED only blinks not continuous glowing. I am confused…„ about this Open LED Driver…„ this my LED "Glow or Blow…?" I saw and design a circuit from this open driver…„ and sharing this with you hon'ble/s friends. Please Advice…

Topic by free2atc  

PVC Art(?) How to make PVC Art that spins and turns from Star to Square.

I saw a "yard decoration" made out of PVC Pipe. Viewed one way it was a Square. Viewed another it was a star (6 sided I think.) So when the wind blew and it spun it was...a star..a square....a star..a square....a star..a get the picture. Well I made one and gave it away. Years later I tried to make another and couldn't do it. All you need are several pieces of pvc pipe and about a dozen elbows (90degree bends). Can anyone help me make this? A picture of one you may have would be helpful. Or a web site ...anything. Thanks Modgod

Topic by Modgod    |  last reply

Need help with signal generator 5kHz and 8.7 kHz

Hi, I'd like some help. I'm trying to make a simple signal generator that will produce a 5kHz and an 8.7kHz square wave signal. I have some basic (very) electronics skills, and know how to follow a schematic and solder things up. The ones I've found online are outdated, using obsolete IC's. Any help would be appreciated. Thanks in advance.

Topic by NorthWind    |  last reply

Question related proportionality Answered

How to find out if any two quantities obey the inverse square law? How to find out if a value 'y' is inversely proportion to 'x' or it is inversely proportional to the square of 'x'?

Question by Wisaam    |  last reply

Can't find the right pins on flyback transformer

 I used various guides to find the negative 0V pin but all outputs give the same values. What can I do to find it? It's one of those 'new' transformers. Also, my transformer to test the thing and use the multimeter is about 14VDC (and the readings when testing give about 16V :P). Should this work? As I live in Europe it should run on 240V. Something else regarding this: Do I really need to make a circuit driver for it or can I use the onboard waveform transformer thingy too? And, if I get this thing to work, could I make a 2N3055 driver but with a different transistor? (I have a IRF630N transistor, would that work? I've also got  C546B and C556B!)

Question by snateraar    |  last reply

How do I cut shapes from square tubing?

Does anyone know any techniques I can use to cut out shapes from square steel tubing? The only tools I have is a drill and a hand saw. I actually have a handheld jigsaw but I need to buy a new battery for it because the last one broke. The illustration below shows how I need to cut it.... Oh ya..the tube is about 1 and 1/2" Thanks in advance.

Topic by IlluminatedAntichrist    |  last reply

How can I turn a square wave to a "logic one" or ON?

Hi, I'm looking for ways to change a square wave to a logic high state. Attached is a diagram of the circuit. It picks up on when you approach it but sends out a square wave of I think about 50 Hz due to induction from mains in the body(?). I would like to turn this frequency into a logic one or ON when the frequency (from the hand) is present and for it to turn to a logic zero or OFF when no frequency is present. My goal is to get a decent logic proximity circuit that I can use to select pins for a binary multiplexer. Attached is a diagram of the circuit which is inspired by this electrocope circuit, that I am trying to interface with other logic components. Basically Im aiming for an electrostatic proximity sensor that spits out a 1 or 0 based on some threshold sensitivity. Would be super greatful if anyone had an idea of how to do this, I really need to get this working rather soon! Best M3rtzi

Question by Mertzi    |  last reply

BUG: Small images are no longer being properly cropped square

It looks like an update was rolled out overnight.  In the Instructables browsing pages, the word "featured" has been replaced with "editor's picks".  Obviously, the underlying URL is the same (since it uses a database keyword).  This change hasn't been done in either the forum topics or Questions areas. There's also a bug in the I'bles browsing.  Instead of pictures being centered to fit in the same sized thumbnail on each image, smaller images now take up less space.  This creates problems with sideshow or video labels, as you can see below. UPDATE 10 Nov 2010:  The bug is not in the page browsing, but rather in the image library system.  The three "square" image versions, TINY, SQUARE, and SQUARE2, are no longer being cropped properly to have equal height and width.  Instead, they are simply reduced in size from the original, but keeping the full image's aspect ratio. UPDATE 14 Nov 2010:  Another user has reported noticing that their step-by-step icon images are different sizes.  This is the same bug, as the TINY version is what is used for the step icons. UPDATE 17 Nov 2010:  Well, the cropping seems to be back to square, but instead of the small images being scaled to the right size before cropping, little chunks are just being taken from the middle.  For large, high resolution images, the result is a blurry bit of abstract art.

Topic by kelseymh    |  last reply

Shape shifters?

Has anybody ever solved a square-1 or other shape shifting puzzles? I am considering making a Square-1 tutorial, but was wondering how many people knew they existed or had them. - is a wikepedia description

Topic by Does Not Compute    |  last reply