Thermoelectric plates not working?

Hi, I am doing a school project and i need to power 8 LEDs with 10 thermoelectric plates, so i soldered 2 on one led and put them over a candle, the LED didn't light up and i don't know why. Is the voltage too low? If so will i be able to power 8 LEDs with ten of these in parallel?  Thanks for any help in advance!

Topic by CrazyPharaoh.   |  last reply

Powering Peltier Plates

Hey guys,So, I just got a Peltier plate, a device that gets very hot on one side while very cold on the other. It requires 90 watts of power. I was just curious what would happen if you powered it by USB or 9v battery. I found this tutorial which uses USB, however, I doubt it gets to its maximum coolness potential. Also, if I used a 9v, would that drain the battery in a matter of minutes, or even damage the plate?Thank you.

Topic by Joe426   |  last reply

usb face plate

Does any one have a line on a usb face plate for the front of a computer? im looking for some thing that would replace one of the removeable slot covers on any computer. i have a car stereo that has usb hook up for flash drives but it looks ghetto with a usb cable hanging out from the dash. i only need 1 usb slot so i guess i could just cut a multi port on up....if i could find one. i checked rs, tigedirect, bestbu, circuit city, and a few build your own comp shops and cant find the usb plate i need. i have a cable with the female end on it and i guess i just need on of these plates to plug it into and flush mount it to my dash steve

Topic by cruisermedic   |  last reply

Simple CNC question... Answered

This is probably really obvious, but I wanted to know if there is a better way.  I was thinking about how I would go about making a simple "mounting plate".  Then I realized that wouldn't I first have to cut it to size and then mill out the holes.  But then the since I had to cut out the plate it kind of takes the point out of the cnc, because I wouldn't be very accurate for the outside dimensions.  So is there a way to machine the outside, even though it would be in the cnc's vice? Thanks in Advance! AI

Question by JaredsProjects   |  last reply

A question of quick-release plates? Answered

Do they make quick release plates for tripods that do not have them? such as a screw-on plate that goes on a 1/4in tripod mount and has a quick release section on top of that with another 1/4 in mount? Thx

Question by astroboy907   |  last reply

is it safe to turn a kettle into a hot plate for boiling solutions?

Hello, i recently realised that my kettle, which consists of just a a kettle shaped container with a hotplate down the bottom, quickly reaches tempuratures in excess of 100 degrees celcius, and so i have considerd getting a second hand one or a scrap one at the local dump shop, to use in my chlorate cell, to periodically boil the solution once per hour to destroy the hypochlorite and re-absorb the chlorine gas which would normally be lost. i intend to remove the little hot plate! i also want to use it, along with some kind of speed controller, or lamp ambience controller or whatever they are called (lamp dimmer), to make a variable tampurature hot plate, using a heat dependant autoresetting circuit breaker to ensure the temp doesnt go above what i want it at. what i need to know, is  it safe, not for me, but for the kettle, to operate for short periods of time without turning off? or would the resistance coil burn out? by that i mean 5 -7 minutes, considering its normal run time is at about 1-2 minutes. or can it safely run on indefinately, with the only damages occuring being melting of wires and the base?

Question by oldmanbeefjerky   |  last reply

Simple revolving floor plate for a human to stand on and... rotate like a microwave plate? Answered

I'm making a short film where I will be wearing some machines I have designed and I really wanted to get a shot of myself rotating 360 degrees whilst the camera is static on a tripod. I'm trying to think of something that would be, I hope effortlessly simple to bash together, can be turned either by hand (out of shot) or on a piece of string? I've worked at auto shows in the past and seen just how complex they can be when done rite... I was thinking a bicycle crank and chain setup but even that is too complex for such a small shot? Ideas appreciated... James :-)

Question by le_bricoleur   |  last reply

Thermal conductivity of two welded plates?

I am in the process of building a wood stove (details on FE Blog) mainly from scrap metal, but I have got it into my head that a stainless steel hotplate would be nice. I wanted one 10mm thick, round with a diameter of 390mm. As it turns out 6mm seems to be a bit of a threshold for stainless, and anything over has to be laser cut or similar and is loads more expensive. Like £80 is the cheapest I can find it.  Anyway, one solution would be to buy two 5mm thick plates and weld round the circumference - that seems like it would work out quite a lot cheaper. The question is how would the thermal conductivity be affected by the tiny gaps which would inevitably remain in the centre (the two plates will never be completely flat)? Is there some kind of thermal paste that could mitigate this, which is very heat resistant? If so how would it deal with being superheated by the welding, and would it contaminate the weld? And lastly - this got me to thinking about copper bottomed pans - how do they bond the copper to the stainless steel (google is failing me- or I am failing google with poor search terms)?? So 3 sort of related questions: 1.Welded plate- big conductivity problem or naught to worry bout? 2.Super high temp. thermal past  - would it help? 3.How are pans copper bottomed anyway?? Thanks, Bongo

Question by bongodrummer   |  last reply

How to make a cam plate for a mechanical iris? Answered

Hi there. I'm making a steampunk watch with a mechanical iris as the cover, inspired by gogglerman's "timeye". I was wondering how you would make a cam plate for the iris, I have spoken to him and he has said that it is made of a brass sheet 6mm thick and he used an angle grinder. I was wondering if it is even possible to make one using handheld tools? I live on a small island where there ar'nt many hardware stores, let alone with the right tools, and i'm probably not even going to buy them anyway. So any ideas on how to make a cam plate?

Question by Hoggster   |  last reply

Automated License Plate Recognition - Good ? Bad ? Indifferent?

Is this a good thing? Does anyone see any possible bad in it (drawbacks, ways to abuse the system)? One place the videos can be found

Topic by Goodhart   |  last reply

I have a scrolling led license plate frame. What do i need to do in order to be able to hook it up to my pc via usb?

 I'd like to be able to mod the sign so that i can hook it up to my pc and program messages into rather than using the painstakingly slow remote it came with. Thanks.

Question by spacegravity4me   |  last reply

SSR and a hotplate

Dumb question. Have a heating plate that uses 1100 watts and runs on 120 volts ac. if 1100 watss / 120 volts = more or less 10amps, Could I safely use a 10 amp rated ssr aka solid state relay or use something higher.

Topic by Computothought   |  last reply

Why have neutral plates in an hydroxy generator? Answered

Hi all, I've been wanting to build a simple hydroxy generator for using it as a torch.  I've seen about 500 gazillion tutorials and alot of them talk abour having 3-5 neutral plates between each positive and negative plate. What is the point of this?  Isn't it better to have all plates connected as electrodes? Also, what's the difference between having 5 neutral plates between positive and negative plate, and just having the positive and negative plates installed farther apart (same distance as if you had the neutrals between them)? Thanks!

Question by Morgantao   |  last reply

High quality and safe nickel plating question? Answered

Hi. There is instruction on this address how to make high quality and safe nickel plating,and i have some question about that. When he showed to add salt to the vinegar in order to make the vinegar  more conductive,isnt the salt become Na and Cl ions? Will the Na positive ion stick to the negative nickel plate?(while making the nickel solution-step 3)? Will the Na positive ions stick to the item that we are plating besides the nickel( in the plating process-step 5)? will it spoil the object that we are plating with nickel? I see in the supermarket vinegar which said"synthetic vinegar" 5% acetic acid,water.(for food).Is it ok? when he said(step 4)"You can further clean your object by reverse electroplating (ie "electrocleaning") it for a few seconds.  Hook your object up to a negative voltage, a WIRE to the positive voltage, and drop them both in a vinegar salt solution for 10-30 seconds.  This will remove any left over oxidation" What wire did he mean? and the last one:how pure is the nickel should be?because i notice that most of the nickel sheet are about 99%-99.7% it ok? can i use pure nickel strip(97% pure nickel)that is used for battery welding? Thanks in advance.

Question by xchcui   |  last reply

How to move plate in front of window with arduino? Answered

I would like to be able to move a plate in front of a window in a door to prevent light from coming in at night. I don't know how to attach the plate onto the door in such a way that it can be moved with the use of a servo/motor controlled by the arduino. I would also like to know where how I could mount the servo/motor and connect it to the arduino, would I need a motor shield or something similar or would the arduino on its own be fine to control it? Thanks in advance for any help!

Question by piefert   |  last reply

How to make a quick release tripod plate?

Me again. I have several tripods I've picked up from Goodwill, and guess what, they don't have the plates that screw onto the camera and clip on the tripod head. Anyone have ideas about a very sturdy alternative? Replacement parts are ridiculously expensive. I'm fooling around with hardware, and any input will be much appreciated. These need to support old-school VHS camcorders. Thanks.

Question by brandegor   |  last reply

I want to make a tiny hot plate

I am trying to make a hot plate about the size of a quarter to 50 cent piece. I am going to wire in a dimmer switch for temp control, I would like even heat so I dont know if nichrome is the way to go-I'd love to use some sort of flat type resistor but havent found anything on line that seems fesible. Also I would like to use a plug in power suppy. Any ideas?

Topic by yoss974   |  last reply

How can I chrome plate on plastic at home?

I want to do chrome plating at home but generally on plastic

Question by pietervas   |  last reply

Can anyone teach me how to make a remote control plate flipper for my license/vehicle registration plate for a car show?

I have a car contest coming up in Indonesia and we have a choice to remove our plates to protect our identities on the streets from show visitors. It usually takes a small amount of effort to remove the plate screws and fix on the contest user name but I thought it would be nice to have it automatically change when I enter the show (might help me gain more points :D) I have tried to search for this item online but some only supply the item to Russia and the rest of the sellers are in China. They cost around 290 dollars for a set, which I thought was quite pricy. To be quite honest in that 290 dollars I was going to spend, I doubted that the China factory would use the best quality materials considering the price. So I was wondering if anyone could help me make one of these automatic revolving plate frames with remote control operation for the auto show? It would be really great as it would help me gain more points! These are the links of the Russian company and Chinese company that produces it: 1.       They have videos (Russia) 2.               They don't have videos (China) Thank you all for you help!!!

Question by 1N5TRUCT4BL3S   |  last reply

How do you electroplate, or plate, small jewelry pieces of copper or brass with sterling silver?

I make jewelry and would like to cover some small jewelry parts/ findings/ charms with sterling silver. The parts are made of copper and some of brass. I would need to do this in my home. If this is possible, how do I go about it? What supplies and equipment do I need? Thank you, Laurel Martin

Question by laurel1   |  last reply

How is this battery spring plate attached to the plastic casing? Answered

Hi, The picture is showing the battery compartment of my kitchen scale. I would like to use this principle in my design and wonder if anyone can tell me how the metal springs are attached to the plastic? Double molded, glued, clip-in...? My design does not have a PCB, which I suppose this scale has.  I am not an electrical engineer so sorry for a confusing question. Thanks!

Question by karolina81   |  last reply

Will a magnet disrupt the flow of electricity through a nearby wire? Answered

I made a removable connection in a project I was working on by soldering the two wires to metal plates and hot glueing magnets onto the plates. This way the metal plates can be brought together and the magnets will hold the plates together so that there is a good connection but I was wondering if the magnets would create magnetic fields that will mess up the flow of electricity. I posted a picture showing the two plates that form the connection I am talking about.

Question by Ke-Bob   |  last reply

How to generate continuous electrical energy from piezo plate? Answered

We want to make a free energy generator from a piezo plate but it does not gives continuous energy so how we can make a circuit to help us??Please help us... Please try to give photos or circuit diagrams...

Question by Mr AbAk   |  last reply

Storing periphery and cables under the table w/ a perforated plate

Hi there! Many years ago, I found an instruction for storing PC peripheries and cables under the desk using a perforated plate and cable ties. But unfortunately, I'm not able to find it again. Does anybody has a clue of what I'm talking about and can give me a hint oder even a link? :) Regards. Felix

Topic by f.zweig   |  last reply

Magnetic Levetation? A Magnet Levitating between two Bismuth plates?

I am trying to make a magnet levitate between two bismuth plates that i made (picture 3,4,5 and 6). As you can see they are round discs about 7mm (millimeters) thick and 110 mm or 11cm (centimeters) in diameter. I bought two magnets; -the one I am trying to make levitate is 30mm (millimeters) in diameter, 10mm thick, and 22kg (kilograms) strong... -the other that is on top, the one that is pulling the magnet up is 30mm in diameter, 15mm thick and 23kg strong I put my two plates of bismuth so that there is about 25mm of space between them... Than I put in the 30mm x 10mm magnet that I want to levitate inside. The other magnet is located above the setup. I very slowly, ever so carefully start to lower the magnet. The magnet between the two bismuth plates starts to shake and at one point hits the top bismuth plate. I can't make it to levitate, either it is on the bottom plate or on the top. I tried to make the space between two bismuth plates smaller and larger, to lower the magnet by a very small didn't help... PROBLEM: I can't make it levitate, either it is on the bottom bismuth plate or on the top... WHY IS THIS? HOW CAN I FIX IT AND MAKE IT LEVITATE? Thank you for your help! -Stanislav A.K.A. Comodore

Question by comodore   |  last reply

Would the HV source of a crackle plate work to charge a bank of HV capacitors?

My cousin has an old Crackle plate, like those funky sci-fi glass plates that have lighting that looks like electricity flowing through it, like you get at Spencer's. The edge of the glass broke, and I was wondering if I could use the HV source to charge a bank of electrolytic capacitors for a Marx bank.

Question by m0nk3yb01   |  last reply

Is it possible to transfer data via magnetic induction between two coils separated by a steel plate ?

Is it possible to transfer data via magnetic induction between two coils separated by a thin steel plate of 2mm ? Or does the magnetic field gets diminished by the metal plate?

Topic by ZZamorin   |  last reply

How do I drive a Peltier Cooling Plate with USB power? Answered

I just ordered some of these 20mm x 20mm Peltier Cooling Plates and would like to power them with a USB hub. Their rated at max of 4 amps and a max 3.8 volts and I know that generally USB is 5V and 500mA. So I know I need to just reduce the voltage, but I'm not sure how to accomplish this. I think I could drive them at 3.5V and still be okay, Not sure if I need a voltage regulator or if just resistors would do the trick. Thank you Kurt

Question by KurtRoesener   |  last reply

How to, or where to find instructions on making a computer controlled LED plate?

Hello, I would like to know were I could find, or if anyone knows how to make a plate of LED's [so a flat surface with LED's embedded], which I would be able to connect to a computer [either via a cable such as USB or an integrated small computer such as the Rasbery pi], so as I could on the computer change which LED's were lit? Personally I know nothing about this material but I am very eager to lean, realizing that this is a fairly complicated project is their a product on the market like this, and what would be some good simple projects that would help me to start learning? Thank you

Question by treky123   |  last reply

Wanting to find someone to stamp names of donors on small brass plates?

This is for a non profit that I raise monies for?  Need suggestions and help finding someone or where to get this done, cheap??? Probably no more than a hundred ??  I'm female. A blonde.  Does that tell you anything??  LOL 

Question by colgates   |  last reply

Intel PIII processor GND and voltage pins?

 I am making the hot plate found at: I want to find the 'voltage' and 'gnd' pins for my Pentium 3 SL4MF processor. The datasheet at: the pinout, but I can't figure out which pins to connect the wires to. Please Help. Kabir

Question by mhkabir   |  last reply

Suggestions for bonding PVC sheets to ABS sheets, for composite armor?

I have a crazy idea for making tough plates out of thermoplastics. Does anyone have any ideas for bonding PVC to ABS plastic? Two materials will add to the strength and durability of the plate. If possible I would also like to sandwich some kind of fibers in between the two plates, such as carbon fiber. Does anyone have any ideas on this? I was planning on heat forming the sheets, then maybe pressing them together at high heat, but an easier method would be appreciated. 

Question by ilpug   |  last reply

Looking for directions for a device made in electric shop class that would let the user shock himself.

I remember that it was mounted on a block of wood, and had a metal plate attached to one side with holes in it.  It used a D battery and a copper wire coil.  A rectangular piece of copper with a copper probe attached was held by the user.  You would try to pass the probe through the holes in the metal plate; if you touched the plate, you were shocked. Does anyone have directions for something like this?

Question by sjardim   |  last reply

how do you make body armor?

How do you make ballistics Armour plates similar to plates used in the military for personal home protection. Is there a material I can purchase over the counter that would be light weight and have similar ballistics protection?

Question by    |  last reply

Help me to find me Ground and Voltage on my Cpy ...

Hello Guys , i need your help .  I want made that : (Hot plate ) And i have a Cpu but i dont know where is the Ground and Volt pin . information about me Cpu : Intel® Celeron® Processor in the 478-Pin Package Datasheet : If anybody can help me =D

Question by draknars   |  last reply

what can I do with copper sulfate besides copper plate things? Answered

I was cleaning my room and found remnants of a chemistry set. any ideas

Question by vince 09   |  last reply

I have been working on this solar cell using the copper plate but it is not working

In that I hve made that copper smaller than the size of the cuprous oxide and other instruction as follows. Is that due to the specific amount of solutin it need or molarity .And by the way what is principle behind this .Plz I need that respond as soon as possible.?It is very urgent thet my teacher is gonna kick me out of class

Question by gapl   |  last reply

Copperplating with non-pure-copper?

Hi! I plan on some experiments with a modified method i saw here for PCB-plating with copper to make the holes conductive. Now the question: What if my metal is not 100% pure but has some impurities in it? Does it still only "transfer" the copper and leaves the impurities as slag behind? I think it should be this way, since a similar approach gets used in refining metals to a very high purity; but i am unsure... Lets say i do: Follow the basic recipe (with smaller ammounts!) @ and use copper sulfide. I think the trick now is that only copper-ions get disolved in the copper sulfide and nothing else. Those ions become plated to the other pole and thus i get purest copper plated to it?

Topic by Orngrimm   |  last reply

gold silver cleaner ?

Hello all, Was at the markets the other day, saw a guy with a neat " trick ", it was a dish of clear fluid and had a piece of alumimium plate about 4" square, when a persons jewerly either gold or silver was submersed { no gloves } and the moment the ring etc touched the ally plate, wallah shiny new looking , no tarnished colours etc.. How The.................does that work, any takers

Question by stickers   |  last reply

How to write code for Text extraction from Image using Raspberry Pi?

Hi ... I'm Student of Electronics . I'm Doing Project on Data extraction from the Image of  Vehicle License plate . What are the algorithms I need to use in the software code to Extract Number from the License plate Image. What is the programming language Suitable for this task.? Thank you.

Question by rkreddy416   |  last reply

Space Heater Repair, is there a glue for broken heating element coil spacer that is inflammable? Answered

Usually a space heater consists of a fan mounted to a motor which is then mounted to a back plate. Connected to the back plate are reflective spacers that hold the heating element coils seperate from eachother so they don't spark. Recently, I figured I'd repair my space heater after it started sparking instead of going and buying a new one. I opened it up to find the spacer plate which has several arms for holding 1-5 coiled wires. One of the arms was broken and the coils touched which is why it was sparking. Seeing as this is a heater, i'm fairly certain I can't use a super glue or epoxy to fix the plate due to its flammable nature. The plates are not easily replaceable themselves as they've been spot welded into place. So the question, is there a type of glue which will hold up under high temperatures which is not flammable that will bond metal / plastic / ceramic. I'd estimate the heating element probably reaches no higher then 700 degrees. If you have any suggestions on how I would go about repairing this I'd love to hear your ideas. Thanks in advance.

Question by Lorek   |  last reply

Creative stompbox lighting ideas?

Im looking for cool and creative ways to use leds to light a stompbox. i found something cool on called a lightplate, which is sandwiched between the pedal and bottom plate,  you drill holes in the middle for leds it gives the pedal an underglow when its turned on. u can buy them from, but only for hammond enclosures, but its basically just a piece of plexiglass, so it would be easy to make. im just looking for any cool original ideas you have, or ways you could make the light plate even cooler.

Question by bobbyderf123 

What for are these connectors on (older) Arduinos? Answered

On Arduino Duemilanove and some other boards (but not on Arduino Uno) there are four small plates near usb socket, numbered 4 3 2 1. On official photos they are just plates, but on my Hong Kong board there are male header pins instead. They are not mentioned in general texts about the board and I can't seem to know the right phrase to successfulli google it. What are these four connections for?

Question by Libahunt   |  last reply

How can I measure pressures/strain up to 5000kgf? Answered

I desire a device to measure a weight up to 5000kg. I don't know if this is termed a strain gauge or a pressure plate. my requirement is that the pressure plate itself be at least as small as a washer for a 10mm bolt. I need the device to record the maximum force, as the force is variable over time.

Question by Phil11   |  last reply

EMT 140 plate reverb transducer & pickups. I want to build studio quality components.

Hello group. I am entertaining a spring project for duplicating the famous German made EMT 140 plate reverb units used at recording studios like Abbey Road. The construction of the plate, supports, box, welding and such is really not a problem for me personally. Even the pickups I don't think are a huge problem as there are many out there ready made and it's probably easier to make a high quality pickup than a high quality transducer. I would however like to build my own transducer but don't know exactly where to start. I don't want to go the piezo route that I see out there as I think that is not going to end up being anywhere near usable in a studio. I'm not opposed to converting a hacked up speaker or something that doesn't look pretty as long as it works. The typical plate reverb build (the main structure and plate) I believe is with a steel plate about 1 meter wide by 2 meters long suspended within another steel frame and tuned (tension even on all 4 corners). Also, there is a damper that you need to build to lengthen or shorten the delay. This general construction I don't see to be a roadblock but the transducer seems to be what I think may trip me up. I would just like to get something working before I dive in on several days of picking up heavy metal, welding and fabrication of the supporting structure and plate. Some things I would like to understand and advice on are: What type of transducer am I really trying to build here or what type of transducers do you think I should consider? Surface? Tactile? Bone? Can I use a regular speaker magnet? If so what is too big or too small for the plate? What gauge varnish coil wire do I use and how many winds for 8 ohm amp? What sort of material should I wind over? Should I just modify a speaker or driver? Are there any other quality units out there ready made to save me the pain of building this transducer from scratch? I do have a Dayton Audio HDN-8 on order to start experimenting but would like to get something better I think. Building a pickup seems to be infinitely easier since I already know how to build guitar pickups and also there are a huge selection of pickups for things like acoustic and mandolin etc. so that I assume is the easy part of the electronics. Still if there are any design ideas you know that would be studio quality I would like to hear from you. My main focus is the heart of the system and the transducer. I have seen a few different methods converting a speaker by cutting out most of the speaker except for the center and then super glue to a metal rod that would touch the plate or whatever but I'm certain that there may be a more simple solution out there. Thanks in advance for any replies! Art

Question by vestport   |  last reply