What material works best as a CORE for a small coil at about 500 hertz?

I am building a small coil with 1000 turns of 36 gauge wire wound around it.  A 12 volt/ 500 hertz squarewave will feed the coil.   I want to receive this 500 hertz tone a few feet away using a sensitive receiver that i have.   However, i am having trouble figuring out what kind of CORE to use and where to purchase it.  I built several coils using various items such as steel, iron, and ferrite from a flyback transformer.  So far, the plain old STEEL works the best, but I keep thinking something else might work better.   I searched the internet, but it starts to get really confusing because of all the terminology like "flux density", permeability, field strength, mu, etc etc.  It must be something that does not retain magnetism when the coil is de-energized.  Any help would be appreciated !

Asked by framistan 5 years ago


Where can i get small toroids for magnetic core memory?

I have really wanted to do this but I could never find those pesky rings!

Asked by seanroberts 8 years ago


Mk7 extruder help

Instead of buying the extruder I plan on making it instead using various parts I have already however I do not have the thermal core. I am capable of milling and if not I know someone with a CNC what I don't have that I need are the "EXACT" dimensions of the thermal core can anyone give them to me?

Posted by pattyshaw 5 years ago


Minecraft draws only one core? Answered

I play minecraft and while playing the only core that gets any work is Core 4, and it is reaching 100% usage, what is wrong, and is it decreasing performance, everything else runs balanced.

Asked by jj.inc 7 years ago


Can one use a single core of a dual-core processor to create a "virtual" graphics card? Answered

 I have a laptop (Thinkpad R61) that has a dual-core processor but horrible integrated graphics. Is there some sort of software that can "split off" one of the cores and use it to simulate a dedicated graphics card? I'm running 32-bit Windows XP at the moment, which might make it difficult to fully utilize the dual-core setup. I'm open to any suggestions that involve Windows 7 or Linux - both are pretty easy for me to get / install.

Asked by idea_flood 8 years ago


Flux core welding wire any good? Answered

Im looking at wire feed welders but I don't want to screw around with gas, So is the gas less flux core wire any good??

Asked by camping crazy 3 years ago


Out of Curiosity, has anyone ever worked with the Hadoop Programming language?

I was just curious, as I came across this reference not long ago: Apache Hadoop Core is a software platform that lets one easily write and run applications that process vast amounts of data.At this link

Posted by Goodhart 9 years ago


Looking for big tansformer cores for high frequency use... Answered

Although I have made more and more progress with my home made ferrite I am not in the need for a big transformer core for testing purposes. Desired frequency range: 30-120kHz Required power: 2kW I looked through endless pages of theoretical science stuff, a lot of useless online listings and thought: Why not do what everyone does instead of using Google and ask my friends here? ;) So far I think an iron powder core might be better in this case than the more traditional ferrite cores due to the power and saturation levels. But what size would I really need so the  whole thing won't saturate or overheat? Ring core or better a pot core?

Asked by Downunder35m 1 year ago


Ferrite Beads

I want to make one of those joule thiefs and I live in the USA. I don't know why I want to make it, I'd never need it/use it... BUT I MUST HAVE IT!!! I'm looking for tiny ferrite beads (toroidal shape) that are cheap (less than 10cents a piece). They CANNOT be leaded

Posted by guyfrom7up 10 years ago


What type of socket has processors that are exactly 1 GHz, 2 GHz and 3 GHz?

I need a 1 GHz processor, a 2 GHz processor and a 3 GHz processor all with the same socket and all with the same number of cores (all single core or all double core).

Asked by danielemur 6 years ago


In Spain, looking for clear teflon tube for a lightpipe.

I guess this question has two parts. I'm prototyping a solar energy device, part of which is a light pipe to transport the collected solar energy, about 300 - 2500 nM. I'm planning on making this from a flexible tube filled with a highly refractive liquid, stoppered at each end with clear plugs. It looks like the materials I should be using are: Tube: Teflon (PTFE, FEP, AF 1600, AF 2400) in that order of desireablitity, lowest to highest. The AF 2400 has a refractive index of 1.29, which is the lowest of any polymer. Apparently. Core: Mineral oil / liquid paraffin. Plugs: Acrylic or normal glass. Thoughts? Also, where would you suggest I try to find these? (I have the mineral oil already) Keeping in mind that I'm in Madrid, Spain. Getting this to work would make a huge difference to solar microgeneration, as transporting the energy is currently a bit of a nightmare. Thanks heaps, Daniel.

Posted by SolarFlower_org 8 years ago


A Question about transformer? Answered

In transformer formula , the primary turns and secondary turns affect the voltage and current directly. Why some transformer output voltage is affect by frequency and core type , just like Flyback Transformer(LOPT) and Tesla Coil specifically is Solid State Tesla Coil?

Asked by james34602 5 years ago


Fictitious Planet Details. Answered

         For a personal project of mine, I am creating a fictitious solar system with planets that can sustain life.  To make the project more realistic, I have a set of rules. Mainly, the planet and its inhabitants have to able to exist. I really want a unique planet, and I have it all figured out, except for one thing. The core. So, my question is this:           Could a planet have a gaseous core, and have it very dense and hot, much like a little star, as well as a solid outside? If so, how could it have formed?  

Asked by eulaliaaaa! 6 years ago


Designers Wanted: Join a Think-and-Make-Tank for Soul of Africa

Oxford University's Said Business School is running a sort of Peace Corps for designers. Writes Lucy Kimbell, Clark Fellow in Design Leadership: We need up to 10 designers who want to use their design practices and skills to help social enterprise Soul of Africa tackle some of the challenge facing it, during a one-day workshop in Oxford in collaboration with MBA students. The workshop is a participative, creative "think-and-make-tank" that brings together people from management and from design to use visual methods to analyze and tackle specific problems identified by an organization. MBA students from Said Business School will be joined by designers from different disciplines to help social enterprise Soul of Africa engage with key challenges. Soul Of Africa is a charitable initiative and a self-sustainable project created to facilitate employment and funding aimed at helping orphans affected by AIDS through the sale of hand-stitched shoes. Unemployed and unskilled women in South Africa are trained to hand-stitch shoes, giving them the self-empowering ability to feed their families and provide them with essential health care. Download more details here. What we are looking for Designers (recent graduates, current MA or BA design students, and design professionals) are invited to take part. Ideally, we'd like a mixture of people from these backgrounds: - visual communication - product/industrial design - service design - interface design - fashion - design management How to get involved To apply, send an email to Lucy Kimbell at lucy.kimbell@sbs.ox.ac.uk to arrive on or by Friday 20 March 2009. The email must include - your name and contact details and any institutional affiliation - your design discipline (eg product, visual communication) - up to 150 words on why you want to participate. Successful participants will be contacted by Friday 3 April at the latest. Reasonable travel expenses to Oxford (standard class return, UK travel only) will be reimbursed to those who attend the workshop, on the production of a receipt.The Design Leadership blog is here.Via Core77

Posted by noahw 9 years ago


Which one is better dual core or intel

I am confused if there is any difference between intel and dual core

Posted by stephenward 3 years ago


steel cable as a transformer core? Answered

Could i use thick steel cable as a transformer core (1 inch stranded cable) if i saturated it in a nonconductive (epoxy? rubber cement? ect..?   material to eliminate eddy currents and molded it into a double C core?

Asked by pwnag3 6 years ago


Raspberry pi 2 processing capability?

Hearing the announcement of the new latest and greatest Raspberry Pi 2, now a backwards compatible computer with a 0.9GHz ARM Cortex-A7 quad core processor and 1GB of LPDDR2 SDRAM, I was wondering of the feasibility of using it as a very cheap and basic solution for a simple computer for my lab. Currently, I am using a compaq presario C700 Pentium Dual-Core laptop, that has been maxed out with 2GB 800MHz kingston RAM, and is running Kubuntu. I should also not the HDD has been replaced with a 120GB one from an old and broken Xbox. I do not like it much anymore, because although the performance of it is acceptable, the screen is a bit low res, at 1280x800, it's pretty dark (or at least until it 'warms up' to full brightness), it had a major scratch on the screen, (no idea how it got there) and after buffing it out with many methods, including with an eraser, the area has became discolored, like a portion of the screen has higher gamut and brightness, and lower black levels. :( Oh well. The main killer for it is that it's form factor. It is too big, heavy, the screen is too small, and it is very cumbersome to use far away in the corner of my workbench. Of course being a laptop, the 'base' of it is fixed to the screen, and to move it closer to me takes away lots of valuable space on my really messy bench. I mostly use it to research part numbers, get schematics off of google, watch YT videos, log data from serial ports (including my UNI-T multimeter with basic data-logging capabilities), and stuff like that. I may have as many as 20 tabs open at a time, which did tax my old compaq C700 when it had 1GB of RAM, but that was likely due to a memory leak issue with chrome, since I have the SAME issue with my main desktop, with 8GB of DDR3 RAM. If the video by MAKE is anything to judge, it looks just as powerful, as this embedded video is large! https://www.youtube.com/watch?v=pZz8MW3DSqA My hope is to replace it with a raspberry pi, and be able to use it for these basic operations w/ a old cheap LCD monitor which can be picked up off of craigslist for cheap. Generally old 4:3 monitors go for next to nothing. Maybe I can even find one in the dump :P. Maybe I can configure the GPIO pins to be COM ports, w/ clock and everything else! That way an external FTDI chip and using the limited number of USBs is not an issue. Is that possible?

Asked by -max- 3 years ago


Using Roma cores Answered

I think you discarded the insides of the Roma tomatoes for the 2nd batch. Do you think it would enhance the recipe to use this core material by cooking/blending it into the 1st batch?

Asked by flavrt 1 year ago


PC with a dual core 3.0ghz processor and 8gb of ram?

Hello!  I need to buy a video editing PC, I need a dual core 3.0ghz processor, and 8gb of ram. Thats all I need.  Can you tell me some models that has those specs?

Asked by dsirotic 3 years ago


What about flux core non-gas wire welders? Answered

The cheapest wire welders use flux core wire and have no shielding gas. Are these welders worth considering?

Asked by Doug Paradis 1 year ago



Which CPU is faster? Answered

A 3.6Ghz Dual core, or a 2.8Ghz Quad core?

Asked by bowmaster 8 years ago



What is 5 core solder? Answered

All i seem to find is a #5. Thanks

Asked by onrust 6 years ago


I want to remove the core from a flyback transformer?

For experimental purposes i want to remove the ferrite core from a flyback transformer. I want to be able to remove it without damaging the primary or secondary windings. I don't care if the core is ruined. Someone suggested boiling the transformer in water.  Has this been successfully done or is this an untried suggestion?    

Asked by Blake 1 year ago


CPU Upgrade?

Hi all. I am looking to upgrade my CPU. I am currently running a Pentium 4 at about 3.0 GHZ. I was thinking about these: Pentium Dual Core Core 2 Duo Core 2 Quad Xeon E3110 I am running on a socket 775. I have a graphics card. I dont think there really is anything else to say. So, what cpu from the above would give the best Bang For Your Buck? The games i play are Grand Theft Auto San Andreas, and Call of Duty 2. I may get COD-MW2 and GTA4. Again, which CPU should i buy? I buy from Circuit City. THANKS!

Asked by sci4me 7 years ago


Who likes this and did i pay a good price?

Who likes this i payed $25 with tax its etched on an old core 2 duo did i get ripped off is it cool? i plan on turning it into a necklace.

Asked by loppy96 8 years ago


How can a make a giant check? Answered

 I want to make a giant check to display in my room. I plan to use foam core board for the check. My problem is adding the graphics, lettering, ect. I dont want to hand draw it but I dont have photoshop. How can I design the face of it? I have paint.net as my photo edititing.

Asked by imthatguy1125 8 years ago


Can i replace my CPU easily? Answered

If i was going to replace my CPU (from say, a 2.8 Ghz core 2 duo to some sort of quad core) and my motherboard was compatible with both, would i be able to do it? I know how i could physically do it, but would it mess with my bios etc? I'm confused with what to do on the software side of it. Please help.

Asked by tudgeanator 8 years ago



FL Studio core utilization? Answered

My brother uses Fl Studio (Producer Edition) with too many plug-ins to count.  I don't know the the number,  just that it's many. He uses it on a 2012 Dell Desktop; Intel core i3 (3.3GHz dual core with hyper-threading) , 6GB of RAM, very basic.  My question is, how many cores can Fl Studio use with so many plug-ins? Up to Six? Eight maybe? I know it should be able to use a quad up. ...And just for the hell of it, his artist Youtube and Facebook pages: https://www.youtube.com/user/ShelterdOfficial?feature= https://www.facebook.com/Shelterd

Asked by The Dark Lord 5 years ago


Can anyone help me make sense of a ferrite core datasheet? Answered

I need help understanding a datasheet for some ferrite cores I bought to wind transformers on.  This is the datasheet: http://www.ferroxcube.com/prod/assets/tx513219.pdf.  The main thing I need to know is the inductance per turn of wire on the core so I can design the transformers to minimize inductive reactance and such.

Asked by UbuntuNinja 8 years ago


CPU Upgrade????? PLEASE REPLY!!!

Hi all. I am looking to upgrade my CPU cooler in my pc. Mycurrent cpu is a Pentium 4 3.0Ghz. My Motherboard is an Asus P5KPL-AM-EPU. I am trying to decide whether to buy a Pentium Dual-Core E6500, or a Core 2 Duo E7600. I USUALLY buy from CircuitCity because of their prices. Again, my choices are: Pentium Dual-Core E6500 Core 2 Duo E7600 I want something BETTER than the Pentium 4, but I dont want to spend much more than 200 dollars, preferably.. closer to 120 or so.. I know that those prices are CHEAP for a CPU, but well.. I dont have the money for a NEW pc, or a Core 2 Quad or expensive Core 2 Duo. If you're wondering why I dont have the money for a new pc or a more expensive CPU, Its because im 12. :D PLEASE REPLY ASAP!!!!!!!!!!!!!!!!!!!!!!!!!! THANKS FOR YOUR TIME!

Asked by sci4me 7 years ago


Need some help with my Redcode program.

Hi all. I just recently got into the sport of Core Wars, and have started writing my first warrior. However, every time it is run, it ends up crashing. Here is the code: JMP 6 DAT 0,0 DAT 0,3 SPL 0 DAT 0,9 DAT 0,-7 ADD #2,-1 MOV -4,@-2 ADD #-2,@-4 MOV -6,@-5 SNE 6,-7 JMP 2 JMP -6 ADD #1, -12 MOV -13, @-13 JMP -2 DAT 0,0 The idea here is to lay down SPL 0 bombs throughout the core and then hit it with a DAT 0,0 carpet when it wraps around to itself. But, when it's run, it gets hit with it's own bombs. I can't figure out what is the matter. I would be extremely grateful for some help.

Asked by dungeon runner 8 years ago


Can I weld aluminum with a mig welder if I have flux core wire? Answered

My parents got me and my younger brother a mig welder for Christmas they also got flux core wire because gas is expensive. But my brother keeps saying that we cant weld aluminum with it I have heard of aluminium flux core wire but he still says it wont work. Dose the aluminum flux core wire work any good or is there something else we need to get?

Asked by Dalen Brewer 3 years ago



Is a dual core fully loaded Powermac G5 Better than a fully loaded Mac Mini? Answered

I was looking around and am wondering is a dual core fully loaded Powermac G5 Better than a fully loaded Mac Mini? How is both of them against the mac pro with 4 gigs of ram?

Asked by robots199 9 years ago


I built a Super (ly fast) Computer, we named it HAL.

I am glad to announce, we have built a super computer. I'm serious, 8gb DDR2 ram, AMD Phenom 9600 Quad Core,500gb SATA hard drive, Dual ATI Radeon 4670 DDR3 512mb Graphics cards, Asus M3N78-VM AM2+ Motherboard. It's so fast, if i was chatting on yahoo, i can see what you are typing before you type it. If ANYONE takes this picture, i will know because the chances of someone with this same set up is pretty slim. Or at least give me credit and let me know.http://www.computersonics.com/Pictures, Well, now!

Posted by Yerboogieman 9 years ago


iPhone Chargers

I have seen many 'ibles on battery-powered USB chargers that say they cannot charge iPhones/iTouches because they require power to be supplied to the data pins. How, then, have I seen iPhone chargers (that work) with only two inner wires - a red and a black?  I recently bought an iPhone charger, so I could cut the wallwart off and use it instead of a USB port in this circuit. However, I have discovered that it only has 2 inner wires, as previously detailed. How could I use a 9V (PP3) battery and a 5V (7805) voltage regulator to turn this into a battery-powered charger? Both of the above questions are ones I would like answers to. Thanks in advance, ~H4ZZ

Posted by __DELETED__ 7 years ago


The force of the coil without iron core Answered

Dear All..  If two coil A and B without iron core same as (size) dimension  and but coil A winding with 28 gauge and coil B with 32 gauge magnet wire Please help me to know : What is name coil more force for  attract a piece of ion metal. Many Thank you                                                                            Best regards                                                                                         lam

Asked by lam 3 years ago



How much power can this ferrite core take?

I have a ferrite transformer core and I was wondering how much power it could take?  And at what frequency would you recommend I drive it? I am planning this for a HF battery powered inverter I'm planning 24-36V input,  200-400V output.

Asked by The MadScientist 6 years ago




most large ( i mean VW size) transformers core rapping is what kind of metal? Answered

Found a big tramsformer, with no ID, mostly buried on the river bank. hoping to cash in if it is cooper

Asked by danelder 8 years ago


Will this motherboard support a dual core CPU? Answered

I'm helping my friend do some upgrades on his computer, it's a Compaq Presario SR2034NX desktop. I'm wondering if it will support a dual core processor or not. According to HP, it doesn't, but looking around on the internet, I've seen quite a few people have upgraded to dual cores. However, there's some minor differences with this particular motherboard. It seems that there are actually two different types of motherboards with the same model number from Asus (A8M2N-LA). On the HP site they have different HP model numbers (a more advanced board - the NodusM3-GL8E, and the one I have - the Naos-GL6; both with the same A8M2N-LA number for Asus) It appears that the NodusM3-GL8E supports all sorts of fun things like 8 GiB of DDR2 800 RAM and dual cores up the wazoo. However, the Naos-GL6 looks like a stripped down version of the NodusM3-GL8E (two less RAM sockets, etc.), so it might not support a dual core. I'd like to know before purchasing, since Newegg won't accept processor returns for a refund. Also, 800 Mhz RAM would be nice to have, HP says it only supports 667 Mhz RAM but other people have put 800 Mhz in with no issues. Does anyone know if my friend's mobo will support a dual core and 800 Mhz RAM?

Asked by RelaxedSoup 8 years ago


Can you make a brushless motor with "axial" cores and magnets, rather than radial?

In the picture, the black discs are magnets, the copper cylinders are coils, and the acrylic disc spins on the central shaft. 

Asked by DrNerdington 8 years ago


How can I make cheap honeycomb core boat hulls

I saw a 'How It's Made' episode where they revealed how to make honeycomb core simply by making a paper accordion, expanding it, dipping it in resin then sawing it into cores. I WANT TO DO THAT! They said they used a thermoplastic paper as well as a heat-activated glue. But why couldn't I use a cheaper more readily available material? Does the resin provide ALL the structural strength, or does the thermoplastic paper itself provide the strength? I would assume it's like fiberglass, whereby after it's infused with resin it's super tough... but the fiberglass itself provides strength too... What kind of material could I use for this? Straight up craft paper & elmer's glue? After the cores are cured and cut, I'll sandwich them between various layers of either wood laminate, plastics, fiberglass, or carbon fiber. Thanks!

Asked by jmlidea 5 years ago


How do I start a PURE rubberband ball?

A lot of people make rubberband balls starting with a tin foil or paper core, but how do you make a core made of rubberband(s)?

Asked by penrus 8 years ago