New Speed Contest Coming Tomorrow

New speed contest to be announced tomorrow. Hint: You don't need a hint.

Posted by fungus amungus 10 years ago

Nice Little Speed Contest Starts Today

New speed contest to start later today. More details soon.

Posted by fungus amungus 10 years ago

DC Motor speed controler

Hi all Can anyone suggest the best way to replace the variable speed trigger of a 18v battery drill, with a remote from the drill adjustable speed control. I want to control the speed and have it stay at the setting until I turn it off or adjust the speed. The drill will be clamped to a board with no battery and powered by a power supply. Thanks for any advice Les

Posted by Les1951 3 years ago

HELP making a 3 speed bike

How can i make a 3 speed gear change bike, instead of 18 gears i just want three

Posted by maccaorgordon 10 years ago

I wan't to know about the speed regulating device known as a governor.

It's also known as the centrifugal governor.It is used in vehicle engines.It's function is to limit the speed of a mechanically driven device.

Asked by ammarasheed 9 years ago

OMG! It's another speed contest!

You thought we forgot about Valentine's Day. You thought wrong.Enter the Share the Love Speed Contest and win some robot chocolate.Mmm... robot chocolate.

Posted by fungus amungus 10 years ago

Can you speed up the video?

Can i speed up part of the video (eg, something cooking) because the thing i want to do takes 30 seconds to microwave?? please let me know :)

Posted by DELETED_JoshM96 8 years ago

High speed digital video camera

I'm looking for high speed digital video camera in price about 5000$. Witch can recording movie in full HD with over 1000fps. Do you know any stores where can I buy something like this. Thanks for help, Pirotech

Posted by Pirotech 9 years ago

Speed control for a 24v to 250w wheelchair motor Answered

 Speed controller for a 24v to 250w wheelchair motor. Can anyone give me a list of parts needed to build  this also a  circuit board diagram showing where to put the components and the size of the PWM that would be required. Thanking you all again. hoplite66

Asked by hoplite66 8 years ago

New Speed Contest Up Now

Mmm...3.14159265UPDATE: The contest has launched! It's a Pie Contest. If you select all the text in this forum post you'll see the hint.

Posted by fungus amungus 9 years ago

Calculating Speed?

If you have an object with a mass of 2000 grams, and it has an average force of 635.029 kg pushing it for a distance of 6.096 meters before it becomes a free-flying projectile.  How fast is the object traveling after the 6 meters and how do you calculate it.

Asked by 5 years ago

How do I speed up my laptop?

Pentium 4, 2.66 Ghz, Compaq nx9010. I reinstall the software that came with it and it runs fast for a while and then slows down again. What am i doing wrong?

Asked by Packers Widow 8 years ago

AC motor speed controller for stereo turntable

Hello Brainiacs, I am wondering about salvaging a electric fan speed controller for my Vintage (1980's) Stereo turntable. I purchased a table from Europe and it ran on 50Hz 240v. But once I rewired the unit for 110v 60Hz it still ran too fast. It is a synchronous 24 pole motor driving a small pulley and belt system. I was told a speed controller would fix the issue by varying the voltage. True? Or if someone could come up with a schematic! ??? Any suggestions? 

Posted by bullit224 4 years ago

How to control DC motor off and on cycles.

I need to control a radio control boat,  i want to cycle the motor on and off to extend the life of the batteries 6 - 12 v 40A my feed would be a normal radio control speed controller Thanks Ian 

Asked by ian.collins.771 3 years ago

Has anyone ever invented a practical microwave-freezer? Answered

You can get water from room temperature to boiling in under a minute, but how could you get it from room temperature to freezing in about 2? Obviously I'm referring to more than just speed freezing water, could be useful for other stuff too. I was just wondering if it was even theoretically possible to make something that did this.

Asked by McDouche 9 years ago

Question regarding speed electricity

Hi people! I have another thing which i do not totally understand, so as usual i have asked in one of my favourite sites! :) I always had a doubt on how "fast" is electricity. In our real world, i can observe that it is pretty fast. If i turned on a switch connected to a light bulb, i can see it turned on pretty much "instantaneously". So a question came to mind, how fast it really is? Is it near to the speed of light? So, i did some googling. According to what i have found and understood so far, it is the electric field that carries information and not the electrons themselves. And electric field travels near to the speed of light( of course, depending on the medium).  If that is the case, then from the "textbook" definition of electricity, it is the movement of electrons right? But according to what i have understood so far, electrons move pretty slowly. In DC a few millimeters per hour or so(not having the exact figure in mind, pardon me) and the average displacement in AC is zero. Then how exactly is electricity so fast? I would appreciate it if someone explains it in a simple way, both on speed and what exactly is movement of electrons. :) Update: Okay, so far my questions are answered, and it seems to take off in different directions(like science always does :D). So to stay true to the question posted here, i would like to say my doubts cleared! Many thanks to people who have answered my question, Specially Dr.Kelsey and Josehf , for the information provided! I will post other doubts in new topics.

Posted by charmquark 5 years ago

How do you play the card game, Nerts? Answered

There's a card game called Nerts, which is highly similar to Squeal, but I can't remember the differences.

Asked by jacobz_20 6 years ago

cpu mhz help

I have an amd duron at home, but no clue how fast it runs. the only other information on it besides a cpu id is C1999 anyone know about hom many megahertz this thing runs on??

Posted by tech-king 10 years ago

i want to make a digital speedometer... What would i need to make it myself ?

I want to make my own digital speedometer for my Suzuki Gs150. I could search the market and buy one but want to make this myself since i think dere's not too much required plus i should know how to. Just for the sake of doing something to upgrade my ride. Would like to add, Any help would be great, As i am eager to learn since i have alot of projects forthcoming, doing my industrial design.

Asked by H4D1 9 years ago

Slowing a motor

I have a 4 Watt mains powered motor that currently spins at 1.6-1.9RPM. I need to find some way of slowing it to maybe 1 revolution every 10 minutes. It's all sealed in a metal case and connected to the mains by a standard plug. I really need to find a way to do this without breaking it apart stuff as it may need a safety test later, I looked at dimmer switches as they essentially limit the voltage and are a max of 300w. Like this - I realise that they are made for lights but it's a similar principle and is only about £6. Would this work? Are there other options if I don't want to break into the motor housing or wiring? Thanks.

Posted by happysnail 7 years ago

What happened to the 'speed' in Speed Contest?

Now, I know that these contests are shorter than ones like the Laser Cutter contest, and the Science Fair, but nearly 19 days long? I thought that speed contests used to be a week, no more. Is there a reason why they are extended now? Thanks, Bran E.

Posted by Bran 10 years ago

New Speed Contest: Toss It!

Show us the best paper airplane you have! Toss It! Speed Contest

Posted by fungus amungus 10 years ago

New Speed Contest Starts Tomorrow

By this time tomorrow there will be a new speed contest on the site. Raw materials for this one will be extremely easy to get, trust us.

Posted by fungus amungus 10 years ago

How can I make a really simple speed controller? Answered

I have a 100w 12V 360RPM motor and a 12V battery. I'd like to know how to make a really simple speed controller to control the speed of the motor. thanks Jack

Asked by sladek 8 years ago

Airsoft speed loader gift to the dunkis!

Maybe someone could make it from pictures provided?

Posted by Katarukito 9 years ago

New Speed Contest Announced!

You have three weeks to make an Instructable that involves LEDs. Go!

Posted by fungus amungus 10 years ago

New Speed Contest to be announced later today.

We're getting into the habit of hitting you guys with more and more speed contests. The responses that we've been getting have been great and we'd definitely like to keep it up. So expect one later today!

Posted by fungus amungus 10 years ago

ac motor speed control

My uncle recently gave me a compact, functional ac motor with an axial blower attached to it. its a pretty cool thing, and i am planning on putting it in my mac's plexi case (when its built). i have no clue how to vary the speed. from what i found on wikipedia, an inductance motor cannot have speed control. how do i know if this motor is brushed or inductive?? and if its brushed, how do i vary its speed? help!!??

Posted by tech-king 10 years ago

How do I control this motor? (speed)?

I have a motor 110v 1/3 hp hz 60 phase 1rpm 1750  class B is posible

Asked by 3strada1965 5 years ago

Cheap High-speed Camera

Yes, I know, It's an oxymoron. I've always wanted a high-speed camera, but they are way too expensive. I was wondering if any of you fellow Instructablers have a high-speed camera that you've lost interest in, and are willing to sell for a low price. Alternatively, if any of you know how to make a cheap, high quality, high-speed camera, could you post an Instructable? Edit: I bought a Casio EX-F1 a while ago, and even made an iBle about it. I also have a bunch of videos here.

Posted by Spl1nt3rC3ll 10 years ago

Best motor for speed control - ( low rpm - spin 1Lb of coffee)

I'm looking for a motor can have its speed varied, down to 1 rpm if needed and that can be done with a simple circuit. I'm building a coffee roasters. I hear that AC induction motors are hard to have their speed changed. The load will be about a pound or so and the motor will spin a cage full of beans over a heat source.  I dissasembled a bread machine and the motor is induction which I have heard is not able to be accurately speed controlled.  DC or AC?  I've seen electric drills used to spin the bean cage. What about a treadmill motor?   

Posted by fizzzbang 5 years ago

How can I reduce the speed of a sewing machine?

Is there an easy way to reduce the speed of a sewing machine?  I'm teaching a young girl to sew, and every machine just goes too fast.   I don't have room for a traditional treadle, but something foot driven would be great.  I need something easy, compact and portable.  At least one machine has an external motor = an external belt.  Any ideas?

Asked by mole1 4 years ago

I am Getting Insanely pathetic Speeds When i download something.?

I Downloaded a 4MB file,and The speed started at almost a meg per second,and very quickly dropped down to as low as 400 Bytes per second,its Was telling me i have 23 hours and 40 minutes left! I stopped the download and tried again. This Is pathetic,It loads Webpages almost instantly,I Tried Connecting to a neighbors wireless,but still,1Kb download speeds. What is going on? And You know what is even more pathetic? This Image Uploaded IN less than a Half second.

Asked by ReCreate 9 years ago

how to convert treadmill dc pulse moter to be used as variable speed moter on a bandsaw? Answered

I would like to have a variable speed  moter on a band saw or a turning lathe and i have a couple treadmill moters .Is there a way to make a power supply or buy one that will work. There's 3 wires on it -1's for a pulse from a hales sencer..

Asked by tom slick 5 years ago

Cheep High speed video camera Answered

I am a science teacher that needs a "cheep" high speed video camera for a project we do as part of our forces and motion unit.  The students build carts out of paper and straws, then race them down an incline.  I videotape them and then analyze the video and the students determine the speed of their cars. (see video here: As you can see from the video, the slow motion video is very blurry.  the frame rate is okay (they are only traveling at 2-4 meters per second, which means about 8-12cm per frame, perfect for the save we are using)., but the initial position and final position is just an estimate due to the blurry car. Maybe I am not using the right terms, I do not know a lot about film/photography, but i need the individual shots to be clearer. I currently use a Flip video camera, which is good because it is super easy to download the videos for student anaysis. What kind of camera will suit my purposes, without spending more than $400? Thanks, Covo

Asked by Covo 6 years ago

A-Jax - Speed - Web Developers

Why use slow flash when faster better ways are there? AJax is great, fast, and does the job. Here is some simple code for your site: xhr = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject("Microsoft.xhr");"POST or GET", "PAGE-URI", 1); xhr.onreadystatechange = (function() { Code to run for the result.. }); Simple yes? My site uses the code above but within lots more Javascript hacks included. My site is My js file is minimized so to get to the code just goto and the same deal with my css file..

Posted by james.mcglashan 8 years ago

Low Cost DC motor Controler?

I want to power a 90 Volt, 5amp Perment Brush type DC Gear Motor. The, "Variable speed controller", needs to be able to use 115v AC or 115v DC input power, which is selectable by the operator. I have used a Staco variable tranformer which uses 115v AC input and rectified the output to drive the motor. But also need the 115v DC input option.

Asked by Realdann 5 years ago

Taskings S PAB Support for OrigamiAirEnforcer's Paper Airport

Well, OrigamiAirEnforcer's Paper Airport group is just new...

Posted by wat. 6 years ago

I need help!

Greetings! I have never built an electronics project like this, however, I do understand the basics of what needs to be done. We are building a car that will run on the Bonneville Salt Flats in 2010. What I am looking for is to build a device to show the difference in wheel speed between the front wheels and the drive wheels. The reasons for this is to give the pilot information on how much traction he is getting at the rear wheels. Since the engine and drive wheels are located 15 feet behind the driver, you cannot do this by ear (especially at 400+mph). The second reason is that the tires used at these speeds cost $800 each, there will be 4 drive wheels, that's $3200 worth of tires. Because of the speed, the tire treads are very, VERY thin, any spinning will destroy the tires in short order. It's not just a money thing, at 400+ getting a flat tire could be fatal. My current thought is to place wheel speed sensors at one front wheel and one drive wheel. That data will be collected and one value subtracted from the other. That difference will be presented to the pilot. I am not opposed to an LCD display or a series of lights that will indicate 5, 10,15, 20 and over 25mph difference. I am a computer programmer by trade and we are planning to integrate a PC into the car for data logging and tuning. I will have a complete CPU available managing the input and output. If we can use the PC to create an application to do this, it should not be an issue. If it is easier/better to build a chip-set to do this, we can go that route as well. I am open to any and all ideas, I have a rough idea of what needs to be done, just no knowledge of parts or processes to complete it. Thanks, Brandon.

Posted by bbarn 8 years ago

What should I try taking high-speed photos of? UPDATE1Apr10

I took the two photos below last year, and I want to try a few more for a new project. My rig is simply the flash unit out of an old disposable camera, rigged up to a microswitch. For the falling coins, they landed on a tilting platform with the switch underneath, so that the first coin to hit bumped it down into the switch and fire the flash. The droplet was just by setting the faucet to drip and poking the switch manually and getting a lucky shot. I'd like suggestions for what to try photographing next. I'd prefer something that can activate the flash by simply pressing two contacts together (i.e., a switch), as I haven't had much luck building light- or sound-activated triggers. UPDATE so yeah, I totally this in before spring break and forgot to mention it. The project was a magazine cover, don't knock the radd grafics dezine skillz.

Posted by CameronSS 8 years ago

How fast is your internet ?

I just want to know please go to and post your results download: 3089 Mb/supload: 547 Kb/sISP: Cebridge Connections

Posted by de-evolution 10 years ago

how can i solder really quickly?

I want to solder about 210 LEDs to a PCB with switches for each individual LED how can i make it not take ages? can i?

Asked by rrrmanion 7 years ago

115VAC low current fan speed controller

Greetings, I am fairly new to electronics, and have mostly worked with DC circuits so far.  I have an AC fan I want to use to make a carbon filtered ventilation fan for my soldering station.  I can do this with a DC circuit and DC fan, but when researching how to do it with an AC fan I came up with more questions than I started with... The fan I have is a Nidec TA450AC model A30122-10.  It is about 5x5x1.5 inches, and rated for 115VAC, 50/60Hz, .26/.21A.  I found data on the fan here: http:// In my research so far it seems there might be three solutions: 1> Use a TRIAC/DIAC circuit, 2> Use a MOSFET circuit or 3> Use a microcontroller/PWM circuit.  There seem to be benefits/drawbacks to each method, and I don't know which method to choose, or even if I'm headed in the right direction..  I don't know how to tell if the fan is  single-phase, triple-phase, induction...  ugh.  I am looking for an inexpensive solution I can build myself,  that performs well. Can anyone help me find the right solution for my application?  Or at least point me in the right direction? Thanks much, doval

Posted by d0val 2 years ago

Excessive heat from my l7805cv voltage regulator? Answered

Hi, I'm a newbie and I've set up a programme using an Arduino Nano to build a high speed photography project using Bluetooth  (from a guy called ZHUT on youtube).  I've used his schematic and  his App and it's almost there, but the l8705cv regulator is heating up fast (almost too hot to touch) after a few minutes( with a heatsink). I'm using a 9 volt dc adaptor, power coming out is 5 volts. The trigger threshold numbers (1023) don't come up on the app. to start the programme running, stays at zero.  I've never used a schematic before, so I think I've wired up something wrong to cause this.  Any suggestions would be really welcome, as I've spent a long time on this and I'd love to get it going. I'll send photos, hope they will help, thanks 

Asked by 0range 6 months ago

How do i slow down a toy car motor without using gears? i wanna know a simple way!!!

I'am having a to car motor and i'am planning to make a robotic arm, but i don't know how to slow it down? so how do i slow it down without using gears or any microprocessor

Asked by DELETED_zerofreak 8 years ago

Using a hall effect sensor with TL494 pulse width modulator.

I have an electric billy cart with a dead controller board. I constructed the kit circuit below to replace the dead board and it works well enough for the job except for one small problem. The throttle on the billy cart utilizes a hall effect device and not a pot. The billy cart also has a handbrake with a switch that closes when applied. I use this with a resistor to discharge C2 and pull pin 4 (inhibit) high. This ensures a gentle start (as the capacitor slowly charges through the 100k resistor) if the brake is released with the throttle advanced. The output range of the throttle is 950 mV to 4.1 V if VREF (5V) is used as the supply. (I'm dropping it in in place of the pot.) 4.1 V is sufficient to achieve the maximum 90% duty cycle of the chip, but 950 mV leaves me with a minimum duty cycle of about 21%, and of course a motor that won't stop. Will changing the divider ratios 20k/2k2 & 47k/47k be sufficient to get me zero speed or am I going to have to do something more exotic? Thanks in advance.

Posted by Rasputin182 10 years ago