What ultrasonic frequency actually hurts dogs? Answered

I AM NOT TRYING TO TORTURE ANIMALS. I'm trying to make a dog repellent device and I need to know how high I can make it before it hurts the dog, because hurting it is not my intention.

Asked by martzsam 6 years ago

How can you keep horseflies away from a pool area? Answered

So, I was swimming at my friends pool today, and 5 of us were bitten by horseflies multiple times. Is there any kind of natural repellent to keep horseflies away from their pool area? Also, they have a bunch of flowers around the pool, so if there is anyway to repel just the horseflies, and not the pollenating bees, that would be great. 

Asked by Zem 7 years ago

I can't afford tick repellent for my yard. How do I make garlic based tick repellent?

Does anyone have a good recipe for making tick repellent for my property in Missouri? The ticks there are profuse. Please help. I have ten acre's so It is too expensive to buy pre-made stuff.

Asked by 9 years ago


Interested in knowing how to repel mosquitos using a frequency generator. Or can someone guide me in building a frequency generator to attaract mosquitoes (not kidding) so that i can lure them into a trap and kill them. Looking for genuine answers please.

Asked by ramki695 8 years ago

Why are bugs repelled by blue?

I just noticed this ; bugs don't like blue. Why ?

Asked by Quest for Questions 7 years ago

Flies - and how to repel them?

Hi, My parents live near a cow farm, and in summer, there is a major problem with flies. Over the years, the house has had most of it's orifices closed with fly & mosquito screens, but even so when eating outside, or playing in the pool, the little buzzers are a real pain. For the moment, nothing really seems to work on repelling flies. What works for mosquitoes does not apply to a fly, a part from fly swats & screens... Does any one have any natural or electronic fly repeller that really works? Cheers, Bpfh

Posted by bpfh 8 years ago

Does spraying rubbing alchohol on your body work as mosquito repelent?

I live way out in the middle of no-where, and my driveway is at least a mile long. Because of the distance from civilization, and the densly packed woods all the way around my house, i like to take hikes in my woods in only socks and shoes. But lately the mosquitos are getting reallly bad, to the point where i take the mosquito repelent with me so i can apply it every two minutes or less. I heard somewhere that rubbing alchohol works as a mosquito repelent and i wanted to hear from someone who was tried it. Do you have any other suggestions for repelent? With that much skin exposed, i can't risk too many mosquito bites.

Asked by PyroMaster007 8 years ago

Does anyone know how to make ripstop nylon water repellent-without the expense of buying a commercial product?

Am trying to construct some dual purpose- outdoor furniture and camping gear-but the only fabric that I have hand is not water repellent. I would appreciate any ideas.

Asked by hiddenartist 6 years ago

Duct tape Repells Pantry moths?

Pantry moth traps have dried out.  rather expensive, i sought an alternative. placing ducttape in a cabinet where ive seen moths, perhaps they would randomly land on it i havent seen moths in that cabinet since. not on the tape or near it. tune in later to see if this is a fluke.

Posted by Toga_Dan 3 years ago

How do I get rid of spiders in my home?? I'm terribly afraid of them? Answered

I live in a mobile home. At this time of year insects thrive. Unfortunately, I'm terrified of most insects, especially spiders. Lately, I've found spiders on the kitchen cabinets and counters. Any suggestions on how to repel them from being in my home?? I hate to use insecticides, but will if I have to. I prefer a more natural type of repelling them. Thank you. Linda D.

Asked by Linda145d 8 years ago

Energy wheel

This Idea is based on Magnetic Repulsion and Kinetic force. According to diagram there will be a  Wheel and a magnet(1) will be attached with this wheel. There will be a balance system(seesaw system) and two magnets(2no.magnet and 3no. magnet) will be attached with this balance system . when 1 magnet will repel 2 no.magnet then the 2 no.magnet will move upward and due to this movement the 3 no. magnet will come down and will work to repel 1 no. magnet and wheel will start to rotate. when 1 no. magnet will again repel 2 no.magnet after a rotation then the 3 no. magnet will again work to repel the 1 no.magnet. In this way the wheel will rotate again and again.The magnetic strength of 1 no. magnet will be high than 2 no. and magnetic strength of 3 no. magnet will be high than 1 no. magnet. I want to develop this technology.

Posted by vikram_gupta11 1 year ago

Calculate magnet repulsive force?

I'm looking to make a "floating" model by insetting NdFeB rare-earth magnets with same poles facing so they repel. Now, magnet selling places specify the "pull" a magnet might have, say 1.2kg. What I would like to know is if the repel is equal in magnitude as the pull if two similar magnets are placed with same poles facing, is the force exerted 1.2kg and so I could float 1.2kg of stuff? Also, does stacking magnets double the attractive or repelling force, i.e. do two 1.2kg magnets stuck together lift 2.4kg of stuff, negating the small difference in distance of one magnet from the object? Is there a way to calculate the distance between two opposing magnets with a force applied. Does it follow the inverse cube rule? And if the stacking does work, do I also need an equal number of magnets on the other side for repelling, i.e. a stack of two 1.2kg magnets repels 2.4kg with one 1.2kg on the other side, or not? Does the magnet on the other side have to be the same force? Lots of questions but hoping someone can shed some light on this as I've not been able to find anything about it :-(

Posted by chiok 9 years ago

strong electromagnets that repel each other?

I have two electromagnets already but they aren't strong enough to really push each other. I've read mixed things online about electromagnets that repel being very weak. I would like to build something like a shock absorber with a electromagnet at each end so when their is a load on the shock absorber the electromagnet can push back and stiffen. Any ideas on this would be awesome, i've spent a lot of hours researching online already but cant seem to find good info.  Thanks

Asked by chrisack 3 years ago

Tick repellent spray for dogs?

My dog and I go out geocaching often and it brings us to many locations deep in the woods.  Naturally, both her and I pick up dozens of ticks along the way. The dog takes a monthly dose of Frontline and it works.  The ticks bite her and die.  No problems with the medication.  I spray myself with bug spray and there are few issues of ticks getting on me when we're out. The problem is, when we go home she will have ticks on her that I missed and they will crawl off of her and onto me or my wife.  I'll find myself sitting on the couch watching TV or driving to the store and I'll get bit by a tick.  My thinking is that if I can repel ticks from the dog, we will bring less home. Is there a temporary spray that will repel ticks from my dog for 3 or 4 hours while we're out hiking and is compatible with her Frontline medication?

Asked by iPodGuy 7 years ago

Needed urgent help of expert in electronics please...?

I was looking for electronic mosquito repellent circuit, I just google it and wow.... there are hundred of schematics. Any one can tell me which one can work perfectly and.... If I setup 555 timer IC circuit for 10KHz and add a 8 ohm speaker between 3rd pin and battery positive will the speaker give the sound of 10KHz??? Please answer. Thank you in advance.

Asked by njrajgelani 5 years ago

Outdoor wood maintenance with preservative/sealant/water repellant?

I had a wooden retaining wall built last summer around a flag stone stair case in my garden. The wood on the retaining wall is treated wood and meant for ground contact. I see that after one winter the paint on the retaining wall is already coming off. Could I get suggestions on how to maintain the wood? Wood preservative/water repellant/wood sealant?

Asked by syaddula 8 years ago

Anyone noticed anything weird about new clothes/cloths?

Has anyone noticed that new clothes and things like washcloths and dishtowels seem to repel water when they get wet? Not really repel, but they don't absorb it, and the surface stays (and feels) wet.After the clothes get washed a couple hundred times, it wears off and is like old clothes.Can anyone tell me why this is happening (and why manufacturers decided to do this)?

Posted by Bran 10 years ago

An Unhealthy Obsession With Magnets

Ever since i observed the attractive/repelling invisible force of the magnet i was interested in this mysterious action at a distance what compels the movement of metal the laws, the principles, wow electromagnetism cool stuff

Posted by eoosen 11 years ago

What is the best design for an electromagnet in a pulse engine?

I am a complete bigger to all magnets, electromagnets, and electronics in general. Recently I've had an interested in different electric motors and have been looking into trying to make a pulse motor that is both efficient and powerful. To do this I want to be able to have the best arrangement of the magnetic fields of the neodymium magnets on the spinning disk and the electromagnets on the outside. I started playing around with the magnetic calculator found on https://www.kjmagnetics.com/calculator.asp but I don't really know what I'm looking at, just that different shapes and sizes have different fields and strengths.  Since a pulse motor is built by using an electromagnet to repel a neodymium magnet, what would be the best design for a strong burst electromagnet in the direction it's repelling the neodymium magnet? Also, what would be the best shape for the magnet to have the biggest repelling effect from the pulsing electromagnets? 

Asked by AlanR18 2 years ago

Deer eating garden

My wife and I have been invaded by deer. We are trying to keep the garden safe and were wondering if anyone has any ideas for a repellant that can be made at home. Any ideas are welcome.  

Posted by RedStarSmilingFoxCreekRanch 2 years ago

Moles! Has anyone invented a mole catcher? or killer! device!!!? Answered

Tried everything from dogs, fumes, water, repellants, & traps but back they come. It's driving me insane!

Asked by Webwizzkid 6 years ago

how can i buy or make finely chopped glass

How can i buy or make finely chopped glass to mix with plaster of paris to plug holes & cracks around the house to repel mice?

Asked by askjerry.tv 7 years ago

can you make two electromagnets attract?

Just wondering. because they are like permanent magnets when used right? and can you make them repel? cause that would be a cool point maglev system

Asked by bufalloo 9 years ago

How can I make a simple ultrasonic dog repeller?

I have been chased by some neighborhood dogs while biking in the last few months, and I need some defense. I don't like the mace or whatever sprays, and I certainly don't want to hit them with anything. I know there are some ultrasonic gizmos but they are awfully expensive. I have found some ultrasonic (25KHZ and above) transmitters at Mouser, and I was wondering if anyone could help with how to make my own portable dog stopper. Please Save My Ankles!

Asked by darryllicht 9 years ago

How can I stop spiders and bees from nesting in my shed?

I have a shed outside and it is full of spider eggs and bee nests, any ideas on how to deter them? 

Asked by zchampine 7 years ago

Magnetic Field for hollow core?

I am working on a project in which I have to control a small setup at the end of a motor shaft using an electromagnet. The electromagnet needs to be around the shaft inbetween the setup and the motor. So I have used a metallic ferromagnetic spool(image attached) and wound 32 gauge wire on it to make it an electromagnet and put the shaft through it. Since this core made out of spool is hollow, I'm not sure how the magnetic field will behave. I tried powering up the one I made and it' seems to be both attracting and repelling a magnet's pole (edges attract while centre somewhat repels). Anyone got any idea about this?

Posted by Antzy Carmasaic 5 years ago

I would like to make a thorn covered surface to repell small rodents from traversing it - any ideas?

Nothing seems to deter squirrels, but I noticed they can be kept somewhat at bay with thorns from blackberrys or rose bushes. but as the canes dry the thorns fall off and they can be moved out of the way

Asked by 9 years ago

Magnetic nail art?

Http://www.nylonmag.com/?section=article&parid=410 Lancome used to make a nail polish with a magnet on the bottle. You'd paint your nails and then put them near the magnet, which would create a starburst pattern by attracting and repelling charged pigments. Is it just me or could this be done with a pinch of iron oxide powder in any nail polish?

Posted by lotusduck 8 years ago

why there is change in polarity in a bar magnet when it breaks?

A bar magnet when breaks does not attracts but repels from where it has broken ...   like [N-------S]   is a bar magnet on breaking it should be like  [ N---S} {N---S ] but it happens to be  [N----S} {S---N] ..  means there is "repulsion" between them WHY SO ?? (Pratically seen)

Asked by aporak 5 years ago

electronic magnet that produces enough force to lift weight

you have an unlimited power source. now is it possible to create enough force at the right "degree" that would be repelled by the earth instead of attracted.. so like a floating magnet. but its strong enough to lift large objects..... like maybe a human?

Asked by fireball9919 6 years ago

Grade 3 science project. How to build a magnetic powered toy car.

This project needs to run solely on magnets. It has to move forward and backwards, as well as turn left and right.Move a two different speeds ( fast and slow ). I know the magnets can be used to repel and attract but  i can't put the idea to paper let  alone help her build it .

Asked by weirdmoss 6 years ago

Some "Attractive" Questions

I've been thinking for a bit, and  I have some questions on magnetism. Question 1: Is molten metal magnetic?  If you place a magnet over a molten metal like iron for example, will it be attracted to the magnet? Question 2: If diamagnetism can be used to repel water, can you use nagnets to slow down or even stop the speed of drainage if the magnet is strong enough? That is all. Thank you.

Asked by Fizzxwizz 8 years ago

electromagnets to push objects without touching it

Hi, i want to make an electromagnetic coil which can push another metal plate without touching it from destance of approx. 50cm . max voltage allowed is 24 v.please suggest me way of getting electromagnet strong enough to push weight of approx 7kg without touching it.can you also suggest me material that can easily repel electromagnet?please help asap.

Asked by KiranS13 2 years ago

Pesky cat and warm air heating sensor

Hi, My dear little cat takes great pleasure in warming her butt on our warm air vents. I was wondering if someone could help me design/build a little sensor that I could place on each warm air vent. It would need to look inconspicuous and keep the cat away from the vent (vibrate or buzz when she approaches? - dunno, you suggest). Thanks! G

Posted by muddywaters 7 years ago

Dual energy generation with magnetic Seesaw system and gravity with the help of 3 volt toy motor

This technology is based on  a Seesaw system and magnetic repelling principle Linear motion  .We can generate electricity with very little force with the help of this technology.This will be a radical step in the field of energy generation. In this technology there will be a balance system and two heavy weight magnets(high strength NEODYMIUM MAGNETS) will be attached with each side of this balance system as per diagram. As per diagram there will be two moving weights and these moving weights will move on tracks.These tracks will be fixed at the angle of 8 to 10 degree. Two magnets will be attached on the front side of these moving weights and these magnets will have similar polarity with the magnets of balance system. These moving weights will be attached with two gear boxes and these gear boxes will be attached with two generators. HOW THIS TECH WILL WORK? When one side heavy weight magnet of balance system will be pressed with the help of any kind of external force then this side will come down and repel its side moving weight due to equal polarity of magnets.due to repelling the moving weight will move forward .but when the heavy weight magnet will move upward then this moving weight will move backward due to gravity to get its position back. in this way this moving weight will work to run a gear box and this gear box will work to start a generator to generate energy. This balance system will also work to pass through their side copper coil due to linear movement and in this way this technology will generate Dual energy. WE will take very high strength NEODYMIUM magnets  for balance system. I would like to insist on some following points (1) The balance system will be attached with 'L' form crank with external PRESSING source. (2) The moving weights will also be attached with 'L' form crank with gear boxes. (3) Each side magnet of balance system will work one by one .When one side magnet will come down the another side magnet will move up .These magnets will come down and move up one by one to repel their side moving weight. (4) We can take as much weight as we can of these magnets of balance system .(500 kilogram to 1000 Kilogram or more) to pass through the heavy coils having 100000 turns or more.  (5) External source of pressing this balance system could be anything such as pressing with foot  or solar cell. WE WILL NEED ONLY 3 VOLT EXTERNAL ENERGY TO PRESS THIS BALANCE SYSTEM  AND GENERATE MORE AND MORE ENERGY.

Posted by vikram_gupta11 1 year ago

DIY Schematic with instructions for pest control

Would it be possible to get a schematic and instructions to build a dog / cat/ rabbit and ground squirrel repeller ? One with a volume adjust would be nice, so they can go anywhere outside my yard. I do have outside AC plugs... However, a battery powered with AC adapter would be ideal !! ?Here in Arizona, I have numerous problems with these pests. They eat my fruit and vegetable plants, tear up my yard, and tunnel in areas they shouldn't, like under the house foundation.Help anyone ???

Asked by BDLP 9 days ago

Oily feeling, water repellent plastic? Answered

What sort of plastic is it which has a permanently oily feel and water will bead on its surface?  We have some in the form of a butter melter which sits on top of a popcorn maker (hence temperature stable) and an ice-cream scoop.  Also, polymorph plastic will adhere inseparably to it, as I found our when I tried to use the ice-cream scoop as a mould - whoops! No real reason for asking - just one of those things I know that I don't know. (Thank you Donald.)

Asked by AndyGadget 8 years ago

How do i make a coil? Answered

The might sound a bit childish but i want to know about a coil. I am currently making a voltmeter(analog).I need to make a coil for it. I have a magnetic wire(around1.5 meters).Every time I make a coil out of it and supply it with power the battery shorts. I get no responce from the coil(like it does not attracts or repels a magnet or nail).So how do make a correct coil for my voltmeter and how do i know weather it responces.

Asked by flyingdutchmen1659 5 years ago

Anti Gravity Idea...

OK I had this idea. I was online and thought up this idea for an anti gravity machine. This is it: use extremely static negatively charged materials for anti gravity. It could work the same way lightning clouds do. The base of the cloud is negatively charged and the ground become positively charged. Now if the material of the anti gravity "thing" is charged with static electricity, wouldn't it repel the ground? Now I am by far no expert in any of this...I just thought it up. What do you guys think?

Posted by bcarl6 8 years ago

Shocks w/ electro magnetics

Hello Every one this is my first post, and since I am a full time student, full time para legal and full time parent, I'm just going to throw this idea out there and let others build on it. Its just an idea that I have had for years. Concerning electro magnets and shock absorber for your average car. Let me know your thoughts. My main thought is that the magnets would be working with reverse polarity add in electricity and you have a pretty good repelling force for going over those bad Jersey roads. Let me know your thoughts.

Posted by arkburn 10 years ago

magnitism? Answered

During a recent stay I showed my granddaughter (8) how to display magnetic lines of force with iron filings. She asked me a question I couldn't really answer so I will ask the combined wisdom (mainly because I can't find an answer on the internet in general) Her question: The iron filings line up along the lines of magnetic force - Why are there gaps between the lines? My answer: My initial response is that the iron filings become magnetic and so repel each other so they form up in the lines we see because they are quite big but the magnetic lines of force are either much closer together or one continuous "beam" Any insight?

Asked by rickharris 4 years ago

Coilgun? Induction? Or something else? Answered

Hi, There video above shows a simple coilgun like device that shoot coins. In my understanding, it looks like a simple induction Coilgun design, since it repel coin away from the coil instead shoot the coin through the middle. However I have a hard time replicate the result. I use the same camera with the same capacitor (350V), and also use penny for the non magnetic projectile. Its the coil part I'm not sure about. In the video, it looks like a relevantly messy and small coil. Can anyone suggest me on the coil design for the same result? Most resources I found are either on reduction design or base on coilgun design instead this simple shooting mechanism. Thanks   

Asked by ljfa321 6 years ago

What can I do with all this lemon balm?

Last summer, I rescued some plants from a friend's window box that were looking dangerously wilty.  The basil and parsley died, but the lemon balm took root like a weed and now covers a two foot square patch of my garden to about knee height.  It's going to have to be cut back before it takes over the rest of the garden like tiberium, so does anyone have suggestions for what I can do with a bushel of citrus-y herb?  I hear the essential oil is used in aromatherapy and has antibacterial and insect repellent properties- should I make like Kiteman and distil some oil?

Posted by PKM 6 years ago

How do I make a carbon fibre pipe for an air intake?

Hello folks! I'm trying to figure out how I can make a carbon fibre pipe for my cars air intake. I have a semi-flexi alloy pipe which I have managed to bend into shape and it will keep its shape without changing even if I take it out of the engine bay. I was wondering how I would go about making a mould of the pipe to make a replica of it out of carbon fibre for ultra cool points. Plus Carbon fibre helps repel heat better than aluminium. I was originally just going to get a Carbon Fibre vinyl wrap around the pipe but, why fake it?

Posted by apmaman 6 years ago

Perpetual motion & free energy is it possible? Answered

Hi Eric/Instructables, Basically I have been looking at perpetual motion and am led to believe that it is impossible due to the laws of thermodynamics meaning heat/energy has to be transferred somewhere, so I came up with a few designs which may challenge this theory.  Without wanting to reveal my designs and ideas too much I will explain what I am trying to accomplish and would love your opinion as to whether you think they are viable. I have 2 ideas, one is to use 'rare' magnets (which aren't rare at all so cost and obtaining them is not as hard as it sounds!) and have the magnets propelling round like a wind turbine design using the opposite poles effect to repel the magnets and get the turbine started.  Once the turbine is in motion I will harness the electricity created by the movement of the turbine/motor in a capacitor or kinetic store. This stored  electricity  can be used to keep the magnets magnetized by wrapping wire coils round the magnets and passing the stored current through the coil to keep the magnets repelling each other and spinning the turbine. Idea number 2 is a similar concept just dropping the use of magnets and using the method of so called free energy where you can get a small voltage from using a radio antenna, capacitors and germanium diodes (there are several example videos on the internet) again using a wind turbine effect to keep re-fueling the capacitors so the voltage drop when the load is applied is nulified. Perpetual motion is the dream and I think the transfer of heat/energy caused by friction can be harnessed and put back into the workings of the appliance/design, Many thanks for your time in reading this and hope for any replies positive or negative the dream will live on in my head and heart  :)  Mark Smith 

Asked by McJesus 5 years ago