Telephone line power help? Answered

Found a cool video from kip kay where in he tapped free energy from phoneline to power LED lamp. I tested my phone line with a multimeter. The readings were as follows; Voltage - 53.8V (DC) Amp - 61.9 So the power running through the phone is 3.33 watts approx. So which resistors and circuits should i use to harness all 3 watts of energy from this secret source?

Question by vic86m 6 years ago  |  last reply 3 years ago


What is used to coat a power line ? Answered

Are they bare? if you touch them you will die ! is that because it is NOT coated with rubber ?  I want to know if something is attached to the wire like a clamp can it feed electric power TO the power line ? If it is NOT grounded but surrounding the wire or clamped onto the wire and hanging from the wire can it feed power TO the Line?  If I  make a solar panel and hang it on the cable will it do ANYTHING ?  or will the power line have so much more power that the small amount from the solar panel wont enter the power line? will it back feed into the solar panel and wreck the solar panel ?   Can it be simple ?

Question by Tormentory 8 years ago  |  last reply 8 years ago


Laptop Power

Hi all. I have a really old dell laptop(given to me) that is missing a power supply. It requires 20v and 3.5 amps to run. I want to make a digital picture frame out of it. I wont be using the battery or cd player and maybe not even the hard drive(not yet decided). Any idea's on what to use as a power source? I don't need to charge a battery just need power. Could I use an old pcu? I know that I could combine the two 12v lines to get 24 ish volts but won't that fry the old thing? I don't want to buy a replacement power adapter cause it is so old and may not work anyway(plus I wont lie I'm cheap lol). Any suggestions?

Topic by jmiller634 6 years ago  |  last reply 6 years ago


Capacitor Power

I want these so badly, and I live relatively close (about 300 miles away).http://cgi.ebay.com/Qty-46-Pulse-Capacitors-7000v-230uF_W0QQitemZ200268515465QQcmdZViewItem?hash=item200268515465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14You can make one heck of a capacitor bank, releasing almost half a megawatt in a split second.My only problems:I don't have 1600 dollars, crycry.These things are so large that if I were to line them up side by side (so that the thinnest parts create the overall thickness) it would be 25 feet long, 14 inches wide, and almost a yard tall. THE POWER BOGGLES THE MINDI'm so mad, if I was an adult I'd buy these in a heart beat... sigh... deal of a life time... I hope not...and best of all, they are PULSE CAPACITORSthoughts? comments?

Topic by guyfrom7up 10 years ago  |  last reply 10 years ago


PSU Power Supply

I built a PSU bench power supply, but it isnt outputing the right voltages. It just out 5v for all lines(12v,5v). It has a purple wire that is said to be the stand-by, but the psu wont start unless it is connected to the 12v or 5v line. It also says that you have to have the brown sense wire attached to the 3v wire but this seems to do nothing. How can I make this thing output the right power(12v @ 22A, 5v @ 50A)?

Topic by tylerb 11 years ago  |  last reply 11 years ago


Building a 5V or 12V powered in-line preamplifier

I want to build an in-line pre-amplifier with a 3.5mm in and out jack.  What I want, or at least think I want, is a simple booster that provides a small, but relatively even gain boost from an MP3 player into the main amplifier. Something along the lines of this: https://www.instructables.com/id/In-line-headphone-amplifier/ However, I would like to be able to power it off of 5V USB or off of the 12V coming into the cigar lighter. What I'm effectively trying to do is get enough gain on low volume spoken-word audio coming out of my mp3 player so that I don't have to crank the stereo up to max.  Does anyone have any good sources for instructions or advice for this sort of thing? Alternatively, someone can tell me if this is a fools errand to begin with, and that I aught to be taking a different approach altogether.

Topic by wildgunman 8 years ago  |  last reply 7 years ago


Getting Power Into A Drawer???

Here's a strange question that I hope someone can answer. I've got a project which has a drawer that has line voltage going into it. My goal is to be able to remove the drawer by unplugging the line voltage. My initial thoughts were using a ribbon power cable but I can't seem to find those. Other two options are coil cord or a retractable cord. In other words, the power needs to stay with the drawer as it opens and closes. Any ideas, thoughts or experiences on how to get line voltage easily from where it plugs in in the back of the main housing and keep it connected within a drawer compartment so I can power a few outlets and other things??? Thanks in advance to the geniuses and experts out there.

Question by pletchman 7 years ago  |  last reply 7 years ago


Resistors power and tolerance?

I am relatively new to electronic projects building and I have noted that some projects do not state the power and tolerance of the resistors. How should I proceed, are there any guide lines to establish the tolerance and wattage? Thatnks.

Question by ajax70 9 years ago  |  last reply 9 years ago


Power LED Help

I'm looking to make some home lighting with LEDs, but I'm not sure how to regulate the current properly. I've really only used resistors up until now for led projects. I have a couple ATX pc power supplies, and I've used it to power an ebay led with no problems. I just touched the led directly to the 3.3v line and ground and it lit up fine. What I'm wondering is, is does the psu automatically adjust the current to what you need? Or is there something else I would need to worry about? (I figured it would be okay to power something off the 3.3V line if they were 3.7V leds, say several P4s)

Topic by opliko 9 years ago  |  last reply 9 years ago


PC Power Supply To Power CB Radio?

I have a cb radio my uncle gave me 12v 2-4 amps.. I have an old computer with a power supply with lines for 12v 6amps and 12v 8amps. is there anyway I can get this to power my cb radio without blowing the thing? EDIT I forgot to mention, this is a mobile cb radio, I'm trying to run it in the house, which is why I wan't to use a pc power supply to run it....

Topic by acer5050 10 years ago  |  last reply 8 months ago


Bike Powered Light?

Some kind of LED, so that the biking charges the battery which powers the LED? I know there's quite a lot on this site, but I've never done anything electrical, and need help with that. Also, I would like (in order): easiest, cleanest (no lines everywhere), smallest, and best looking one possible... And I need a lot of help with electricity... 

Topic by Batryn 7 years ago  |  last reply 7 years ago


Single and Triple Phase? Answered

Ok, so I thought I knew how the power phases worked and then I got myself confused.  Our house has three phases and it offers power at 120v, 240v, and 480v (or at least can I think).  All three wires on the power poles go to transformers and then to the house and so on.  I have seen houses that just use one which I think I understand unless they try to get a dryer then what do they do.  I am going to ask a little more than phases here to just to make sure I get this.  In you wall outlet one is from a line on the power poles correct? and the other is ground which works because at the generator site the electricity is grounded on one side.  Now before I get ahead of myself, how can there be single and triple phases in a 120v outlet and what exactly are they.  Now, at a 240v outlet you have two hot wires coming from the power lines right, and then one ground.  Now I think all the lines on the poles come down to 120v, so how do you get 480v from three 120v lines.  3*120 does not equal 480v.  I am confused.  Also will having triple and single phase even effect how things work.  Like we have a 120v single phase compressor and it works just fine at our triple phase hose.  So it doesn't really make any sense at all.

Question by jj.inc 8 years ago  |  last reply 2 years ago


How to make Line powered LED strip lights? Answered

I want to make Line powered(250 volts) 35 or more LED strip lights so that i can replace all my flourescent lights in my house.

Question by hemanthpanchal 10 years ago  |  last reply 8 years ago


Powering infrared Line Laser using USB port

Hi,  I have a line laser which has following specs!!! http://www.aliexpress.com/store/product/780nm-60mw-5V-IR-Infrared-Laser-Line-Module-120-degree/640033_1594226134.html 5V DC or 3.3V preferred!! Working current must be < 200mA How can power this laser using USB cable or USB port I know USB has 5V DC (max current is 500mA) I want to know how to convert it so that  i can power the laser??!!! Thansk in advance for help!!

Topic by victorx10 4 years ago  |  last reply 4 years ago


Can I add a power line to an iPod remote?

I'm considering buying a wired remote for my car: http://www.dealextreme.com/details.dx/sku.11592 But can I add a power line (Such as my old 5.2V GBA SP Car Adapter) to this remote so my iPod isn't dying the whole time I'm playing music.

Question by manouttatime 9 years ago  |  last reply 8 years ago


How to connect 2 lines power kite strings Answered

Hi ,I bought my kids a power kite that shaped like a paraglider ,it has a control handle with two strings coming out of it but the Kite itself has five Bridles ended each with an anchor point ,two in the front end,two in the rear end and one in the middle .any Ideas on how to connect them lines...??? Thanks

Question by mbourhan 8 years ago  |  last reply 8 years ago


Can I use the same ground line for 2 different DC voltage out puts?

It seemed a bit pointless to me to use an inverter to get mains voltage just to use a transformer to step it back down again to charge a lap top. This in hind sight may be the cheaper option. So I decided to build a power supply from commercially available parts this step up dc to dc device seemed to fit he bill http://www.technobotsonline.com/pololu-adjustabe-step-up-9-30v-5a-max-input-current-2.9v-to-vout-input.html coupled with a replacement charging lead from www.life4laptop.lt. My problem is this, the mains power supply from HP doesn't mention that the central pin is a different voltage to the inside of the plug, as the new cable had 3 wires a stuck a multi meter on the mains adapter to check the outer is indeed negative, and the inner contact 19.5v as shown on the power supply label the unmentioned central pin is at 14.1v . I don't have any worries about running 2 step up devices in parallel from the same 12v supply. I'm a little concerned about using the same ground line for 2 separate devices even though the mains unit does. It has occurred to me that there is probably a simple way to drop the 19.5v to 14.1v for the central pin but I don't know if they run at the same current and if my understanding of electronics was up to that I probably wouldn't need to be asking what I suspect is a fairly basic question. I am pretty adept at assembling and checking out puts of  things others have designed I just don't understand the design bit.

Question by Stan1y 3 years ago  |  last reply 3 years ago


3-Phase Power? Answered

I already asked a question about three-phase power but my results only confirmed what I thought.  I don't understand how a MOTOR can run at 230v with three phases,  how do they rate power with these I guess.  230v outlets have three prongs, I think two are connected to the generator through power transmission lines, and one is a ground.  If this is wrong were do they get 230v because, if I am wrong all three wires connect to generator coils.  This would add up to 345v.  But to get 230v it would only be two phases.  Then it can also run on 480v, how in the world do you get to 480v.  Please help me with this.

Question by jj.inc 8 years ago  |  last reply 4 years ago


Splicing house circuits together?

I'm planning on getting a very powerful welder. I'm don't really think our puny 15 A circuit breakers can handle the massive amount of current it will draw though. I've heard of welders being plugged into circuits meant for stoves, but my stove's circuit isn't easily accessible from where I want to weld. I was wondering if it is possible (and safe) to splice together circuits in parallel. As in, is it safe to take the supply of one 15 A circuit, and splice it together phase to phase with a different 15 A circuit? (You know, like, without burning anything down. Specifically, my house.) When you connect two circuits in parallel, the amperage adds, so it should get me a good 30 amps, right? 

Question by tylervitale 7 years ago


Multi-Source power?

Hello all, i'm thinking on a very easy way to support more than 1 power source for my electronic circuits.Below you can see the schematic. It's very basic. Each source have a rectifier diode to disallow inverse currents for each one.When both sources have the same output, both diodes will work and the output is Vin - 0.7When one of them is bigger than the other (the case on the schematic), diode on smaller source will open circuit, and the bigger is the one to be used. The output will be 7-0.7 = 6.3V.The problem i found is when there is little difference, this is less than 0.7V.This way both diodes will work but there is a difference on voltage between the two sources.Do you think that having a small resistance like 10Ohm and high dissipation in one line will solve this?Do you think this design is valid?thanks for the help in advance.

Topic by Tigrezno 11 years ago


Component to switch multiple data lines?

I'm looking for a component that I don't know the name of because I have very little electronics experience and asking google these types of things seems to get me everywhere except where I need to be. What I think I need is something that will allow me to switch between four different data lines simultaneously but default to four other lines. For example: Input 1 has four lines. Input 2 has four lines. There is one output with four lines.Real World Problem:I bought a digital picture frame for super cheap and didn't get a chance to research it. It is powered by a USB wall transformer. When the picture frame is receiving power from the wall, it displays the images. When it's plugged into the computer, it goes into update mode and mounts a drive that you can copy images to.What I Want Now:To be able to flip a switch and have it change from USB wall transformer to USB PC. So, from the above: input 1 = USB wall power, input 2 = PC USB, output = picture frame. The switch box would have a 2x USB Mini-A inputs and one USB Type A output.What I Want Later:I imagine it's trivial(?!) to change the physical switch out for a 555/556 timer and two potentiometers so that I can have set a Frequency and Duration of changing from the default wall power to the PC's USB power.What I Get:A picture frame that every x minutes switches to the PC for y minutes so that I can write an application to look for a newly mounted volume called KODAKFRAME (just an example) and create images for it of things like the latest news and weather or maybe even just change out the pictures for variety.My Real Motives:I'm an IT guy and would love to use this as an auxiliary display for info that isn't critically time sensitive such a free disk space, recently received FTP files, etc.Thanks in advance,3Toe

Topic by 3ToedBoxTurtle 10 years ago  |  last reply 10 years ago


How do i power on my pda without a battery (power to the electricity lines)? Answered

Good day to all.    About a few months ago, my pda got broken (and so as the battery) and i want to power it on to the electricity. How do i do that? Here are the pictures of the pda:= http://s1152.photobucket.com/albums/p487/LMAO1398/ http://s1152.photobucket.com/albums/p487/LMAO1398/ pda pictures:= From:= http://s1152.photobucket.com/albums/p487/LMAO1398/?action=view&current;=Picture015.jpg To:= http://s1152.photobucket.com/albums/p487/LMAO1398/?action=view&current;=Picture001.jpg If you want to know more details, ask me I really want to power on this pda (it has been a long time since i worked with him and it was a very good pda)

Question by Peter5465 7 years ago  |  last reply 7 years ago


Where to find old UPSs welders and power line transformers?

I am trying to make money by salvaging copper from old junk like tranformers. I wanted to know where I could find the following items for salvaging: UPSs. Uninteruptable power supplies have really nice power transformers with lots of copper. Old welders. These have lots of copper in the windings and cables. Power Line Transformers. I have read these have about a hundred dollars worth of copper in them. I would like to get these for free or very cheap. Thanks.

Question by nurdee1 7 years ago  |  last reply 7 years ago


Power LED from RF? Answered

I have a maybe somewhat unusual question.There is a super simple circuit that enables an LED to be powered by ringing mobile phone. Can be found at http://www.creative-science.org.uk/mobile_LED_simple.html What I would like to do is to power LED but from a distance, preferably Radio Stations of (if possible) power lines. LED does not have to be constantly on or bright, it can "blink". I was looking at Joule Thief and combining it with capacitor ... The point is that there should be no battery. Is such a thing possible?

Question by nccwarp9 7 years ago  |  last reply 2 years ago


No power in any outlets up stairs power comes and gos ? Answered

I live in a old cobble stone house it seems there is one line that feeds all the out let’s the power comes and gos i have checked all the plugs to see if there was a loose connection every thing was tight the only power I can find comes from the attic but again there is no power ther again how can I trace the power feed to upstairs the wires are all steel Rome wire can a breaker be bad  I’m not even sure what breaker runs upstairs any help would be appreciated thanks mike

Question by MikeB641 1 year ago  |  last reply 1 year ago


Powering Video Game Consoles with Single Power Supply?

I'm in the planning stages for a office/video game room. I own a lot of game consoles — around 20. I want to hook them up to two televisions — one HD plasma and one SD CRT (older ones will probably go to the CRT). I'm starting from an unfinished basement, so I have a lot of freedom for the design. One thing I really want to avoid is a rat's nest of cables — 20 consoles can result in a big mess. I'd also like to avoid having wall warts draw power when I'm not using their respective console. With that in mind, plus a desire to introduce a little automation, I'm planning to use an arduino (probably a mega 2560) along with a bunch of relays and a power supply of some sort to do this. For consoles with internal power supplies, I'll run AC through some relays. But for the DC ones, is there anything I should be worried about? I plan to use voltage regulators (possibly variable along with some digital pots) to set the correct voltage for each console. Should I put fuses in line? Diodes? I should mention that I don't plan to ever have more than one console on at a time. That said, I do plan to use a desktop PSU or something like similar that can provide plenty of amps. I don't yet know as much as I'd like to know about DC and what constitutes a good source of power, and I just want to make sure I don't fry any of my consoles through some rookie mistake. I'd appreciate any advice, suggestions, etc. Thanks!

Question by fwonkas 4 years ago  |  last reply 4 years ago


Let us assemble power distribution switches at home together.

I am an electronic engineer in the field of power distribution switches. In recent days, I am prepared to make a project for power distribution switches at home together.  The project begins now: Home decoration, the concern of hydropower indispensable. The laying of the home circuit is a crucial link, the home distribution box installation involves the safety of home appliances. Therefore, I specifically summarise the home distribution box installation knowledge, as well as home distribution box wiring diagram to make the relevant finishing, for everyone to take precautions, the home distribution box has a clear understanding. Home distribution switch installation points 1, Household distribution switch sub-metal shell and plastic shell two, there are two kinds of mounted and concealed, the box must be intact. 2, The household distribution switch of the cabinet wiring assembly should be set up to zero line, to protect the ground wire, phase line, and to be intact, with good insulation. 3, The installation of air switch seat should be clean and there is enough space, should be installed in the dry, ventilated parts, and no obstruction, easy to use. Never install the distribution box in the box to prevent fire. 4, The household distribution switch should not be installed too high, the general installation of the elevation of 1.8 meters, in order to operate; into the distribution switch of the electric tube must be fixed with a lock nut. 5, If the household distribution switch to be open, the edge of the hole to be smooth, smooth, distribution box buried in the wall should be vertical, horizontal, edge left 5 to 6 mm gap, distribution box wiring Should be rules, neat, the terminal screws must be tightened. 6, The loop into the line must be sufficient length, no joints, after installation marked the name of the use of the circuit, the installation of household distribution box to be completed after the removal of the distribution box residue. How to assemble power distribution switches at home ? 1, The installation of electrical box, distribution box installed on the wall, should be used bolts (expansion bolts) fixed, bolt length is generally buried depth (75 ~ 150mm), the thickness of the box floor, nuts and washers Of the sum of the thickness, plus about 5mm of the "margin". For smaller distribution boxes, it is also possible to embed a good brick at the installation site (in the form of a distribution box or a panel mounting hole) and then use wood screws to secure the distribution box or power distribution board. 2, Dark assembly distribution box, distribution box embedded in the wall installation, in the wall when the hole should be reserved than the length and width of the distribution box about 20mm, the depth of the distribution of the thickness of the distribution box with the wall Plaster thickness. In the masonry distribution box, the box and the wall filled with concrete can be fixed to the box live 3, The distribution box should be installed firmly, horizontal and vertical, vertical deviation should not be greater than 3mm; concealed, the distribution box should be around the gap, the edge of the panel should be close to the wall, the box and the building, Part should be coated with anti-corrosion paint. 4, The distribution box installed in the spiral fuse, the power cord should be connected to the middle of the terminal contact, the load line should be connected to the threaded terminal. In this way, in the loading and unloading fuse will not be electric shock. Porcelain plug-in fuses should be mounted vertically. 5, The distribution box of AC, DC or different voltage levels of power, should have a clear sign. Lighting line, should be set to zero line (N line) and protect the zero line (PE line) bus, zero line and protection of the zero line should be connected to the bus, not twisted, should be numbered. 6, The wire leads to the panel, the panel line hole should be smooth without burrs, metal panels should be installed insulation protective cover. Metal shell distribution box shell must be reliable grounding (then zero). Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of power distribution switches. I need continual learnings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help ? thanks in advance.

Topic by maryzhu 2 years ago  |  last reply 2 years ago


Power supply help asap!

I am very disapointed. i just spent 4 hours working on a atx power supply. (look at my other forum post) i did everything they said. but whenever i turn it on and run it with something, it turns off. i noticed that when i hooked up the led to the green ad black wire, it was dim. and when my supply turns off, the led keeps on. what could be my problem? i put a 10 watt 10 ohm resistor in between the 5v line and the ground. any ideas. asap. thanks

Topic by DELETED_DELETED_kruser495 10 years ago  |  last reply 10 years ago


Solar Powered Drip Irrigation

Hi. I am in the process of designing and building a balcony garden with drip irrigation for multiple 3' x 1' planter boxes. The idea is to automatically water with a reservoir pump attached to drip line. There is no water or electrical outlet, so it has to be off grid. This being my first solar project, advice and assurance would be much appreciated. The pump would be turned on for about 1 hour every other day or so, this being hot Miami.  Diapragm Pump (12 Volts, 3 Amp draw): should generate enough PSI for the drip line http://www.ebay.com/itm/100PSI-DC12V-4L-Min-Solid-Electric-Diaphragm-Water-Pump-Self-Priming-for-RV-Boat-/281366070408? UPG UB1250 Sealed Lead Acid Battery (12 Volts, 5 Amps): http://www.amazon.com/UB1250-Sealed-Lead-Acid-Batteries/dp/B001DL9IBC/ref=zg_bs_389574011_9 ALEKO® Solar Panel (5 Watt, 17.5 Volt VMP): http://www.amazon.com/ALEKO%C2%AE-5W-5-Watt-Monocrystalline-Solar/dp/B0046HE62G/ref=sr_1_7?s=lawn-garden&ie;=UTF8&qid;=1450573836&sr;=1-7&keywords;=5+watts Docooler Solar Charge Controller (20 Amps, 12 Volts): http://www.amazon.com/Docooler-Controller-Battery-Regulator-Protection/dp/B00L37KZI6/ref=sr_1_3?ie=UTF8&qid;=1450580867&sr;=8-3&keywords;=charge+controller Main concerns: Will the battery and other electronics be able to function through the 100+ degree days of Miami? Does the system have a good power supply? Is the equipment good quality to last 3+ years? Thanks for all the input and insight!

Topic by bzand 3 years ago


How did the wind powered generators work THAT WERE MADE FOR some African primitives?

Some of you failed to even read the one line question:  "How did the wind powered generators work THAT WERE MADE FOR some African primitives?" They were made by an international humanitarian group.  Did you notice that the article on this mentioned that the one watt LED light caused the birth rate to drop by one third? Thanks for the great answers that I got from those who read the question.

Question by dogiewal 8 years ago  |  last reply 8 years ago


Need to find the standy by or PS on line in an ATX variant power supply Answered

Need to find the standby line on a power supply for a motorola dcx3400 cable box to run an original Xbox I had purchased the box from a resale shop to use for parts. It occurred to me that I could use the PSU to power my blown xbox. Both are manufactured by Delta. So I used my multimeter (first time using one) to get a pin out of the psu at the connector. 16 pins from top to bottom as shown. I know i rounded off these values and I can go back and use the slight variations in readings to find "rails."(?)My issue is as far as I can tell, all of the pins are powered when the psu is plugged in, and I cannot tell which is the standby if there is one. What test can I do to find it? And if there is no standby or ps on, can I safely use this to power an xbox? thanks for your time, -sk8er6

Question by sk8er6 3 years ago  |  last reply 3 years ago


Solar powered RGB led strip

I want to make a solar powered rgb led strip. My thought is something like christmas light. I would like the lights to have effects like fading, blinking, and chasing. What equipment do I need and what steps do I have to take? I was recommended to use arduino and have started looking at that and would like to use that as it seems easy to use. The led would be RGB led so that I can change colors and stuff like that. I was thinking of having 2-3 independent "lines" which would make up one strip. For example, one line would be red and the other would look green. it would look like this: r-g-r-g-r-g-r-g with r meaning read and g meaning green. I dont know if it would be best to run each line in serial or parallel. Then I would like to provide power for the whole strip with a small solar panel. Sort of like the ones used on solar lawn decorations or solar motion sensing security light. Hopefully I wont need a big solar panel and a small one would be enough to power all the leds that I want. I'm thinking of having about 100 led per strip so 50 led per line. After this is done I might want to do a strip of 200 led. And finally, I would like for the light to turn on and off automatically at dawn and dusk.  Is anyone willing to help me out with this project? I am a newbie and need lots of help.

Topic by erickarlop 7 years ago


Magnets, Magnetism, Field lines ???? An expert is needed for green wind power.

This is best placed in the green group as it is for the production of green electricity, but I think that it would not be out of place in the science section also. I have an idea, quite probably not an original one but an idea all the same. It came about as we go camping as a family and have been off the grid a few times. Basically we have had no way of charging our electronic devices for longish periods. Solar power I hear you cry, well that is all well and good if you live in a country that has good sunlight, but here in the UK it can be unpredictable and not produce enough charge to power modern devices. I am mucking about with dynamo’s on the bikes (pedal ones) and wind up devices. Something I am looking into is things like wind power or improved dynamo power. The basic principal behind all of these forms of power production is that of passing a conductor through a magnetic field to produce a potential difference on that conductor. Simples (reference to meerkat advert http://www.youtube.com/watch?v=NBu0OtC6m9g). It has been a very long time since I have done anything like this (way back in school all those years ago) so please stick with me on this one. If I remember right the principal theory is that 1. The higher number of conductors (or loops in the coil) that passes through the field lines causes the voltage to be higher. 2. The stronger the magnetic flux the higher the current production within the conductors. This is a bit basic to some of you I am sure but I still need to get it out to confirm my thoughts. If this is wrong please correct me, as the title says, an expert is needed lol The bar magnet field lines project from the N end and loop back to the S end in this fashion Image 1 Putting two bar magnets together with N and S facing gives a field pattern like this Image 2 Now this is where I need the most help with. Toroidal magnets produce a different field pattern, and as far as I can make out from the internet it looks like this Image 3 & 4 What I want to know is what happens when you put two toroidal magnets on top of each other, what happens to the field lines then. I have thought that there are a few possibilities on this, the first is that the circular lines will extend to encompass both magnets creating like an hour glass formation in the cross section. The second is that field lines will combine/intermingle between the magnets and create a figure 8 pattern. In either of the two possibilities the field strength will be increased to what could be considered a focal point between the two magnets. So with the technical thoughts out of the way and progressing on the assumption that I am correct so far my thought of a high powered dynamo is this. A central shaft that is spun by wind or other means, attached to this shaft are disks like platters on a hard drive, attached to those platters are the toroidal magnets. The magnets are aligned and spaced to give maximum condensing of the field lines between the upper and lower platter. In the centre of the two (or more) platters is a fixed platter, not attached to the shaft and is stationary. On this stationary platter are the coils, fixed into position. Image 5 The coils are shaped and could be something like the voice coils out of a hard drive, which would be good as they would determine the size of the platters, being key stone shaped they will fit together to make a ring of coils. Image 6 The whole idea is based upon the maximising and focusing of the field lines from the magnets to a point producing the maximum amount of energy as the coils pass through the lines. I also think that due to the shaft being turned having little resistance or weight that even small amounts of wind energy would be able to turn it to produce the desired outcome. Now this is where I ask you all to comment and take my thoughts to bits where I have assumed things that are wrong. I have no problems being told where I am wrong as long as it is not in a nasty way. Cheers all

Topic by Batdragon 6 years ago


Thin lines distorting my images in my Digital camera?

When I use an external power source in my Canon Digital Camera the Image taken by flash is full of  thin Gery horizontal lines. These lines do not come when photo is taken in daylight. Only the Flash Photo is effected. WHY?

Question by Dipankar 8 years ago  |  last reply 8 years ago


Help with a DIY 90vdc power supply with low amps from a 120vac standard line.

I need to make a power supply for a project. I need 90vdc with very low amperage. I am currently using (10) 9v batteries placed in series to get 90volts. I would like to make a custom power supply so I can get 90vdc from a standard 120v AC power line. Preferably I'd like something I could make and put on a circuit board. Thanks!

Question by AudiSteve 7 years ago  |  last reply 7 years ago


can i Splice A usb socket extension cable into power cable???

Hello, I have a little sub woofer box and 4  speakers connected to it, it has a line out 3.5 mm headphone jack which i connect my iphone to, the Subwoofer box has a power cable which plugs into the mains power. This is for work and it does the job just fine. my question is though i want to put a USB socket in the subwoofer box so i can charge my iphone at the same time via USB. Can i splice my usb socket extension  cable  into the power cable??  The power cable does not have an AC adaptor on the end if it just the plug. If this cant be done How can i get power to usb. Thanks in Advance.

Topic by Benji29 6 years ago  |  last reply 6 years ago


Guide Me !!!

I want my Arduino  to control 4 power outlets (on\off)..my home electricity is 230v so i have to design  4 power outlets which should control hair dyer(400w),200w blub,Lcd tv,(50w)pumps in my project if any fault happens like overvoltage,neutral line fault or overheating happens in any of the outlets that particular outlet should be isolate which should be indicate with LED for this which component should use whether SSR relay or 4 channel Relay shield ?? and  sensing current and voltage for measuring the total power which was consuming by the devices which should transmit thro zigbee to LCD for monitoring... give some idea plzz  Please help me understand these things, and remember I'm very  new , so if you think I need to but something else, it will be great if you could explain !!! Lots of Thanks !!!! shyam

Topic by svenkatesh3 5 years ago  |  last reply 5 years ago


Running USB 3.0 extension next to AC line

I have an HTPC hooked up to the entertainment center.  I have a 5ft rubber "wire-hider" that I'm running an extension cord to a coffee table with a hidden power strip so people can plug in their laptops, etc. I bought a 5m/"15 ft" usb 3.0 extension cable and ran it next to the cord in the wire-hider, then connected usb 3.0 powered hub to the cable.  PC struggles to connect devices, and drops them intermittently. My 1st guess was EMI, so I unplug the extension and no problems. My question, can anyone suggest a source for shielded USB 3.0 extension cable OR can I use Shielded Cat6 to run USB 3.0 signals?  Besides wireless or buying a second wire-hider, do you have any other suggestions?

Question by jongscx 4 years ago  |  last reply 4 years ago


Weed Whacker-Powered Bicycle

This is a bike I built a year ago. It uses a 30.5cc (about 1.5hp) weed whacker engine for propulsion. A version of the same thing was on Instructables, and that's what partially inspired me to make this. ;) The engine mounts are made out of wood, because I still have not learned to weld, but they hold up just fine. The engine is an ten-year-old Echo weed whacker. It has 10,000 max RPMs. The bike peg attached is 2" in diameter and gives about 25mph top speed. There is no clutch! The one that came with the engine was way too flimsy for a vehicle like this so I took it out. Saved a lot of space, too. For the throttle, I disconnected the back brake line and connected it to the engine. The front brakes are still intact, and you can turn the engine off to slow the vehicle as well. I added the extra heatsink to the engine to help keep it cooler, as it was never meant for this kind of exertion. It gets as hot as the engine, so I guess it conducts the heat away pretty effectively. There is a 10-LED bargraph to show the engine temperature. It uses an LM3914, an op-amp, and a thermistor. There is also a 555 to drive a buzzer when it gets too hot. The bike has head and taillights that are both driven from a joule thief. They are not very bright; they are more for being seen than to see. Here's a youtube video, taken almost a year ago: http://www.youtube.com/watch?v=bdySFqmK0Fw Some more photos and a little more information: http://forums.modretro.com/viewtopic.php?f=3&t;=656 Comments/criticisms? :)

Topic by 1up 8 years ago  |  last reply 8 years ago


Powerline communication

Hello I'm intrested in plc (powerline communiction) but I can't find specific schematics and / or "to the point" information. If someone can help me with information ect... or anything use full??  Thnx

Topic by geo bruce 7 years ago  |  last reply 7 years ago


powered pocket door/sliding door using automobile power window motor?

Hi, looking to make something along the lines of this youtube video, using a car power window motor, but would like to be able to use 2 switches or pushbuttons, one for each side of the door. It's not for our house or anything so it doesn't need to look pretty and I probably won't even be using an actual door, but a piece of plywood instead. Any ideas on how to make it happen? Thanks for the help. I'm sure there are better ways, but I'm looking to do it cheap.

Question by payne.kj 7 years ago  |  last reply 7 years ago


how to power a circular rail Carriage

Hello. Looking for ideas on how a circular rail carriage could be powered. Here is what i am looking at  http://www.ghbinroth.com/nadella/nadella-multimotion-line-fsr-system.pdf https://www.alibaba.com/product-detail/High-Quality-And-Precision-Circular-Guide_1974565028.html On a linear rail its common to use 8mm Acme Lead Screw to translate the nema rotation movement..how is this done on circular carriage like the links above.  thanks

Question by davvito 1 year ago  |  last reply 1 year ago


How to combine AT and ATX power supplies to power same system (motherboard)?

Hello,   I am struggling to upgrade a certain medical system . The device I have contains an old motherboard which powered by an AT power supply. My problem is that the power supply board (which supplies the AT power) has other functions, and there's no way to be replaced (by an ATX PSU). I already bought the motherboard: http://www.ibase.com.tw/2009/MB970.html , with INTEL core i5 CPU  Cry Cry. I can't risk my power supply board in attempting to operate the new parts (motherboard, CPU, 4 Gb RAM, CPU fan, SATA harddisk, and DVD), I believe it won't stand that kind of power consumption. I know you'll say this won't work at all -I know, but I was thinking about using voltage regulators to generate the 3.3 v rail from the same AT power lines. OMG I really need help about: How I can connect the AT and ATX power supplies to this motherboard (and to the other parts), ensuring that I am not risking my AT power board at all?. Another headache is that the AT power board has to work at the same time with the motherboard. And in order for the system to work the AT power board has to work (you know that a feedback circuit should be completed) that's why it should be connected to the motherboard.   This really became a challenge for me. I can't stop thinking, planning, and dreaming about it. If you have any idea or any experience about this, I would like and hope to hear from you...

Question by muhammad.shamut.7 4 years ago  |  last reply 4 years ago


Is there a high power mains supply for industrial purposes? Answered

I am building a manufacturing plant and have machinery that will require 792 kilowatts. Obviously I can't pull this from the grid so I was wondering if there  is some kind of high power line for industrial purposes.

Question by versos-tk 4 years ago  |  last reply 3 years ago


Convert battery power to low voltage?

Is there an easy way to convert a security system sensor from battery (2 3V lithium batteries) to a wired low voltage line? I have pulled the cover off the sensor (image attached) and it doesn't look too complicated. Other options would be to convert it to POE or USB. Don't know if that's doable or practical. I'm building a house and have an opportunity to never have to replace those batteries, which are not on my "be nice to the environment" list. I have plenty of low-voltage in the house already. There is also built-in solar backup for 12-15 hours for power outages. Thanks for the help.

Question by lgpitman 4 years ago  |  last reply 4 years ago


Help choosing AC Power Adapter

I just purchased a Samsung DigiMax 301 Digital Camera from a friend and he did not have the AC Power Adapter for it. I've looked for a replacement on line but haven't been able to find one. There are all kinds of cheap priced AC Adapters though but I'm not sure which one will work for this camera. The original Adapter is (3.3V 2.0A). I found one at www.goldmine-elec-products.com, that's 3VDC 350ma, would this one work? I have no idea what the 350ma represents so I'm at a stand still on this. Also, would I have to match these specifications, (3.3V 2.0A), exactly? Or could this vary somewhat? Any help would be appreciated!!

Topic by mrreno 11 years ago  |  last reply 11 years ago


iPod nano (3rd generation) charger

There are a lot of post about Ipod chargers and I was not able to charge my ipod yet! I tried different resistors on the data lines (D- D+), 5V to Pin 13 and Ground to pin 16. It shows charging for a little and then stop. I need to have a good simple circuit diagram, with the right resistor to charge my Ipod nano 3rd generation using a 5V power supply (picture of model attached). Thanks for your help in advance! Gracias.

Topic by luisnperez 7 years ago  |  last reply 7 years ago


Supplying power to the PIC12F508 through a transistor.

I'm trying to supply power to a PIC12F508 via a transistor, so it can turn itself off once it has finished working to save power. The Idea is for the push button to supply power to the chip, which sets GPIO5 high on power up, so turns on the transistor, allowing power to continue flowing to the chip after the button is released. The PIC turns on correctly when the button is pressed, but will not remain on, despite power being supplied to the transistor from GPIO5. Another possible issue is that while the chip works properly, it continues to put a high on GPIO4, lighting the LED while VSS is disconnected. I have checked that the code functions correctly, and have tested this without the additional lines from the programmer. Any suggestions would be appreciated.

Topic by The Skinnerz 7 years ago  |  last reply 7 years ago


Solar Power Well Pump Idea Thing

Hello, I've been thinking lately about moving out to the desert lately and living off the grid with a well, but I'm not sure my base idea for pulling up water from a well will actually work. My idea is to have a line running up from the well (ending in a one way valve) to the bottom of essentially a steel water trough with a glass lip on top making it airtight. A pvc would run from a hole in the top to a water storage tank to move water vapors up there and condense them. My hoped mechanism of action would be as the air heats up in the trough due to the sunlight it would force the water up from the well little by little and evaporate it. My question is, will this actually pull up water from the well or would I have to buy a solar pump?  I don't need lots of water fast or high pressure, the water storage will gravity feeds and collect throughout each day. My other idea which I'm pretty sure will work is having the showers, sinks, and washer (using a compost toilet) feed a one way line out to the hotbox too. If as little as 50% of the water makes it back into the lines that way then I will have cut my water usage in half. What does everybody think?

Question by Johanna_W 2 years ago  |  last reply 2 years ago


Need to find the standby line on a power supply for a motorola dcx3400 cable box to run an original Xbox?

I had purchased the box from a resale shop to use for parts. It occurred to me that I could use the PSU to power my blown xbox. Both are manufactured by Delta. So I used my multimeter (first time using one) to get a pin out of the psu at the connector. 16 pins from top to bottom as shown. I know i rounded off these values and I can go back and use the slight variations in readings to find "rails."(?)My issue is as far as I can tell, all of the pins are powered when the psu is plugged in, and I cannot tell which is the standby if there is one. What test can I do to find it? And if there is no standby, can I safely use this to power an xbox? thanks for your time, -sk8er6

Question by sk8er6 3 years ago  |  last reply 3 years ago