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Lead in eye!?

What I do!? When I was wrighting my Math homework and my stupid pencil lead broke, few up in my eye! And its stuck! I've tried watering it out, but no luck. Looked in the mirror and theres a faint black line under my eye (not on/in it, I mean in between). Will the pencil lead do something bad to my eye? Will I need special treatment to remove it? Is it possible my body "somehow" remove that lead in my eye?

Question by BIO Wolf    |  last reply


lead-free ?

How can unsolder lead-free solder?

Question by tomasillyo    |  last reply


Lead guitar

Ok, Danny posted his "lead guitar" instructable, and he won't let me edit it, even though i have tried before, so should i make my own????

Topic by Metal4God    |  last reply


Waterproof Leads

Hi guys! So i was done with this instructable: https://www.instructables.com/id/Water-Level-Indicator-with-Alarm/ Everything is working perfectly except for one small problem: our best friend, CORROSION The wires that go into the tank are getting corroded. Its forming greenish layers(i assume copper oxide) and after reduces conductivity and also after a while, it washes away with water. I want to attach a metal, which is more resistant to corrosion, to the wires so that i can seal the wires themselves and only expose the metal leads, and since they conduct electricity, my indicator will work fine. The only problem is : WHICH METAL? I have no idea which metal i should use. Anybody suggest something which is commonly available and resistant towards corrosion? Also, can i use graphite leads, the one they use in pencils? Or will it cause any problems?

Topic by charmquark    |  last reply


lead acid Q's? Answered

So me and papa have been working on farm equipment and an electric golf cart (and I had issues with my jeep cranking over, with a presumably bad battery), but my lack of knowledge of these batteries used in the machines is starting to get to me. Differentiating normal behavior from behavior indicating a bad battery or other problems is not really something I can do right now. What I know: Topped off voltage: 15 (ish) volts ( details?) Dead flat voltage: 10 volts Cold cranking amps: indication of maximum current a battery can deliver in the cold (details ?) Reserve minutes: equivalent to "AH" rating times conversion factor lead acids can take a beating and survive without a, less say, "exciting" failure mode What I don't know: How am I supposed to know what I don't know???? ;) What is a typical topped off voltage for a battery? Does the voltage sag from say 16V when charger is removed? What characteristics change as they age? I would guess increased leakage current/resistance, reduced current capability and reduced capacity (?) would you lose a bit of capacity real quick after cycling a deep cycle marine battery a few times? I know lithium ions do, every new phone I ever had has lost at least 10% of it's capacity in a few short months as it got "broken in." What about maximum charging current? Does ripple current matter?

Question by -max-    |  last reply


single lead capacitor

How can i make a single lead capacitor for this https://www.instructables.com/id/DIY-Lightning-Wand-a-Handheld-Van-de-Graaff-Genera/

Topic by taterkiller    |  last reply


-12v leads to GND?

First off, i apologize for asking so many questions. google couldnt tell me a single thing about what i wanted to know, which was how the -12v is created and why a computer needs it. so i turned to a broken power supply to see is the -12v connects to a IC of some sort, which i would assume creates the strange voltage, confirmed by a datasheet. i completely traced the traces with a multimeter and at one point a capacitor went to ground close to where the -12v connection is on the board, after an inductor of some sort. the trace continued, and lead to a pin on the transformer, much to my disappointment. BUT that same trace was directly connected to ground, so now i am confused, does the inductor type piece createthe -12v? there was a diode as well, but i thought nothing of it or its place on the board.. i have a feeling i should have, shouldnt i? fed up and confused by the power supply, i turned to my motherboard. where the -12v leads to a smd capacitor and then traces from the capacitor, to ground, and nowhere else as far as i can tell with a multimeter and a dark blue motherboard. then i bring up the picoPSU, how do they make the -12v, if it is even made? is there a chip responsible? or a inductor like i found in the power supply? -5v has been omitted form power supplies, so im assuming that the same can be done by -12v, right? and wouldnt you get a -v type measurement if you put the + test lead on the - terminal and vice versa?

Question by zack247    |  last reply


Mosaics and Lead lighting.

Hi all. I am  a new member with tons of creativity inside me. I create stuff from other peoples junk. For many years I have wanted to turn my hand at Mosaics and Lead Lighting. I want to create a beach scene in Mosaic of Shoalwater Bay/ Penquin Island which is near Rockingham, Western Australia. I already have painted a 16 foot by 7 mural of this idyllic part of the world on my lounge room wall. Looks magnificent. I want the mosaic to be at least 4 feet by 3 feet. How do I stop the mosaic from sliding off the mounting board? Do I drill a myriad of small hole into the board so as to give the medium purchase? Also I want to make Lead Light full window coverings, from 2 feet square up to 4 feet square. Are there any members who would like to give me some clues on how to begin? In researching accessibility of stain glass I have not had a lot of success here in Perth, Australia. Maybe I need to go to junk yards? Thank you for reading my request. Anticipation is high that I will actually begin creating my creations. Bretrick

Topic by bretrick    |  last reply


what is the difference of the crystal 4 leads and 2 leads?

I want to make a simple AM transmitter, which is use a crystal with 4 leads. and i don't have crystal with 4 leads, i only have crystal with 2 leads, can i use crystal with 2 leads ?

Question by Rendydevara    |  last reply


Convert Crayons into 2mm+ Leads Like Graphite Lead

Hello! I want to recycle crayons and thought of converting them into 2mm lead or larger in diameter (since there’s only a certain thickness where crayons can be sturdy). I also thought the crayons should be mixed with something since they’re wax. I was thinking of buying a silicone mold rubber to make a mold (may make the lead bend since it’s flexible but easy to remove), a polyurethane mold rubber, or a protruder like the old fashioned way. Silicone mold rubber is expensive ($30+). I originally thought of it as a craft, but it’s too complicated for a craft. Thank you for your time!

Topic by TrixiaL    |  last reply


Desulfating Lead Acid Batteries? Answered

Does anyone know what it means to desulfate a lead-acid battery? What does It do? Thanks :)

Question by Yonatan24    |  last reply


Lead Acid battery repair?

I have a dead  6  volt 4ah   lead acid battery and 12 v 190 amp  liquid  battery some one help me to bring it back to life 12 v battery i used with ups

Question by chnaveed.alam    |  last reply


Lead Free Solder Recommendations

Hello, I am going to be working on some electronics projects soon and was wondering if anyone had recommendations for lead-free solder. Some completed projects are going to be shipped to the EU, California and New York so I need to start paying attention to RoHS standards. I was hoping to get pointed in some sort of direction to avoid buying a dozen different kinds and figuring it out myself. Any advice would be greatly appreciated. Knowledge regarding previous experience with lead-free solder and electronics would be awesome. Thanks in advance.

Topic by cunnane    |  last reply


Instructable update leading to error

Hi there, I wanted to update my photo Instructable ( https://www.instructables.com/id/Laser-cut-wooden-herborium/ ) but even if I tried yesterday and today, it leads to this error: ERROR 401: edit object EP37PU4H5Y9VOAC - ERROR 401: edit object EP37PU4H5Y9VOAC I wanted to update the keywords, once it's already published (add keyword). The path I followed to get there : - From the Instructable page https://www.instructables.com/id/Laser-cut-wooden-herborium/ - I chose Edit (the buttonon the right from "Author options") - I clicked on the "Publish" tab - I changed the keywords - I clicked on "Save changes" (bottom) - I got the above error. Thanks for your help!     Raphael

Topic by r4f    |  last reply


Shorten the lead on a light fitting.

I bought this ceiling light: http://www.diy.com/departments/colours-cantemir-ceiling-light/234751_BQ.prd As you can see from the picture, it seems to fit fairly snug to the ceiling. However, when I got it home I found that the cable length was slightly more than a metre! I mean, who has ceilings that high? Anyway, I thought it would be no problem just to cut the cable down and refit it into the ceiling rose. My wife pointed out that the instructions say, "Caution! The length of the cable cannot be altered." The fitting has 4 x led bulbs. Can anyone tell me if there could be a problem if I shorten the lead? Frankly, otherwise I will take it back for a refund.

Topic by Pateesh    |  last reply


Difference lead acid battery and closed lead batteries + interchangeable chargers?

I found a 6v closed lead battery as found in UPS systems. I'd like to get in in condition again and found a schematic for a charger/revitalisor for motorcycle batteries. But those are open batteries, and I found chargers specifically for that type somewhere as well. Could I use it anyway or is that a bad idea?

Question by Fozzy Vis    |  last reply


Will solder conduct electricity between two leads even if the leads are not touching? Answered

I recently moved from a prototype to soldering the components. This is a very compact application, and I'm thinking some of the leads are not actually touching (which is why it isn't working), but the solder still provided a strong bond. Should the leads always be touching in order to eliminate a poor (or no) connection? Also, would it be poor practice to use a small snippet of 20 gauge wire as a "crimp" over two leads to ensure connectivity, or would this only complicate matters? Thanks!

Question by giantjamsandwich    |  last reply


Why do manufacturers put lead in EVERYTHING?!?

Why is it that apparently almost everything contains lead? Almost all metal items appear to have lead... keys, tools, plumbing fittings... Also maybe in plastic. What i'm most annoyed about (and why i asked this) is about lead in plumbing parts. If you go to a hardware store and get a metal plumbing fitting, it should say "Lead Free*" but then when you look at the details, it would say something like "The wetted surface of this product contains less than 0.25% of lead by weight". Basically you'd probably always find it saying "less than x%". But why can't it be ZERO? Maybe it's because their metals are always contaminated and they cannot make it 100% lead free? Also, what about metal items like tools and keys? Why do they have to put lead in the metal? Does it make it easier to manufacture or something?

Question by poiihy    |  last reply



walmart (U.S) lead-lead free solder that erodes soldering iron tips

What solder to use to keep it from eroding my s-iron tip i like lead-tin but i am not sure if rosin-cores by themselves not erode soldering iron tips lead-free solder uses antimony, another neurotic metal that can cause cancer

Question by cavemen    |  last reply


Extracting lead from car batteries?

I have a couple of battered old car batteries. There is no local scrap dealer that will take them so I was wondering if it would be possible to extract the lead myself and sell it for scrap. I have searched on google and cannot find anything about this and I suspect it would be dangerous and impractical. However I thought there's no harm in asking here. I was imagining that I could open the battery up and pour the acid into some kind of strong alkali, neutralising it to make it safe for disposal. But then, I certainly wouldn't like to try this without some advice first. Cheers! Pete

Topic by peater    |  last reply


Overfilled SLA (lead acid) help!

What should i do its just leaking gas (I assume its hydrogen) should i keep chargeing till this stops or what? thanks for helping

Question by Daniel Deacon    |  last reply


Request for Toy Lead Test Instructable

There are constant reports of high lead levels in many toys, as well as new findings that lead is an even more dangerous neurotoxin than previously believed. Does anyone have the chemical background to devise a simple home test for lead levels in toys? My thoughts are that a number of toys would be place in a bathtub, and a leeching agent would be added which would dissolve some of any lead present. The dilute solution in the tub would then be tested by a standard home water supply lead test. This could possibly be a great service... Thanks!

Topic by bugmenotorelse    |  last reply


building a portable lead-acid charger?

I have two lead acid batteries rated 6v 4.5 AH (is AH ampere? or ampere/hour) boast/equalize 7.2-7.5v float 6.75-6.9v max charge current 1.35A both my batteries are identical the question now is.. i want to build a charger for it and something to lower is current so some feature i want is  1) rechargeable by a simple plug in adapter (i have a 12v 4A ac-dc adapter) 2) output of usb voltage and current (optional adjustable current and voltage) 3)led indicates 4)optional: a switch to power usb devices directly from the adapter/bypass battery to extend battery life 5)around 5 usb out puts? i want to build this project cos i have the won batteries which are in good conditions but not being used in anyway.. i hope someone can help me with the technical specs..especially on the circuit diagram   have access to an electrical components shop but it does not sell chips so i need to salvage them

Question by michaelgohjs    |  last reply


Whats the fastest way to make lead acetate? Answered

Hello, ive just tried to make lead acetate by putting lead into a mix of lead metal, acetic acid, and hydrogen peroxide, but nothing has happened , the hydrogen peroxide just decomposed by the lead, and then the solution because all frothy and grey. i understand now that lead dissolves very slowly in acetic acid. is there a faster way to make lead acetate?Ive been looking online , and nowhere does it say how long it takes to make, aside from one place that says it makes 30g per year! using just lead and vinegar. also, would electrolysis work? using two lead electrodes? i managed to make copper acetate of a high concentration (solution turned very deep blue), would the same work with lead? ir would it just make HHO?

Question by oldmanbeefjerky    |  last reply


12v to 12v lead acid charger? Answered

Is there any way to make or buy a 12v battery charge another 12v battery?

Question by Daniel Deacon    |  last reply



Will .22 lead slugs work in a ball mill in place of ball bearings?

I'm making a ball mill but am having trouble acquiring lead ball bearings.

Question by WareOuttaHair    |  last reply



what are the + and - leads on this hard drive motor? Answered

Please tell me the + and - on this hard drive motor

Question by Dumchicken    |  last reply



Where does the belly button lead to? Answered

I know it scars over after birth, but what if you opened it back up? Would it still lead somewhere? Could it be used again as a 'feeding port' if opened? Sorry for not picking a best answer to my last question about snow. I wasn't convinced there was a best answer but I did learn a lot.

Question by avocadostains    |  last reply


LEDs with short leads causing problems? Answered

So for Christmas i got a bunch of these leds from amazon and im making and led cube with them. the problem is the leads are so short i use copper wire to give some space for each LED. so for instance its    [Cathode]-----copper wire-----[Cathode]     . But as i solder one end of the copper to one cathode, it will melt the connection at the other end causing me to re-solder once it cools, sometimes it total luck that it stays.  So if you can understand this, does anyone have a more productive way to make this cube?  (and please dont say get LEDs with longer leads)

Question by texpert    |  last reply


lithium vs lead acid for gokarts

For electric go karts, which one is better (for the money)? Lead acid is by far much much cheaper, but it is much much heavier. With a heavier battery you need a stronger frame, which weighs even more. With all of this weight you need an even stronger motor to push it all. With lithium you can build a lighter, cheaper frame, and power it with a weaker and cheaper motor and still obtain the same speeds. Lead Acid batteries take up about 1/3 the weight of a gokart with rider (1/3 being the driver, and the other third being chasis and motor and such). Reducing the weight by about a third (honestly, lithium, batteries weigh like nothing) could have huge performance improvements. So, does spending more money on batteries, and saving money on chasis and motor equal out to spending less on batteries and more on chasis and motor?

Topic by guyfrom7up    |  last reply


Links to groups lead to featured groups

When I click on this group, it leads to a list of featured groups: Pro Knexers https://www.instructables.com/group/https://www.instructables.com/group/proknexers// That also happens with this group: Knex Builders https://www.instructables.com/group/https://www.instructables.com/group/Knex_Builders/ If you click a link above and look up at your address bar on your browser, it's not the same link. There's more groups this happens to. Is this just me? Your help is appreciated. Thanks.

Topic by Shadowman39    |  last reply


Could cleaning with bleech on lead paint cause temporary stroke like symptoms and fetal distress? ? Answered

I rent my home. When I moved here with three children, I was told there was no lead paint. Seven years later, I became pregnant. While cleaning, I used bleech to clean walls and floors and shelves and windows. I also scraped and repainted some areas. One night, I went to the store with my eldest daughter and had slight pain and numbness on one side of my body. I also couldnt speak properly or complete a responsive answer with correct words. My sentences were inappropriate. It lasted about 24 hours and got better. I felt extremely fatigued but blamed pregnancy. A few days later, I was sick, enormously fatigued and had sharp abdominal pain unlike labor. I went to the hospital and my baby's heart rate was failing. He was dieing. He was taken by emergency c-section, two months early and recovered in the newborn intensive care for three weeks. I recently found out that the home i rent does indeed contain lead paint and probably a good deal of it. The home owner found out about a state program that would come in and do all kinds of renovations for free if he signed up. Then he discovered that he would have to pay the back taxes on the home and cover the cost of the inspectors and opted not to have the lead removed. I am still living here with my children.

Question by Everan    |  last reply




Should I worry about the lead (solder) content in old sticks of RAM that I want to sell as keychain charms?

I have a lot of old sticks of RAM (the ones that predate PC100). I have been cutting them in half on a band saw and then attaching keychain rings in the existing holes. I'd like to sell these as novelty items but wonder about the lead content in the solder. Toughts? Thanks, Okie

Question by okieinAZ    |  last reply


Please suggest me a charging circuit for 12V 7.2 Ah lead acid battery without application of transformer

                                     I am using 12V 7.2Ah Amaron Quanta lead acid battery for an Emergency Lamp. I am using the following charging circuit which is attached with this post. In this charging circuit, 230 ac voltage is given as input to the 16-0-16 transformer. The output of transformer is filtered through rectifier diodes and then given as input to the LM317 of charging circuit. As of now transformer is needed to step down the ac input voltage. I need a charging circuit without a transformer. So kindly suggest me a circuit which consists of input rectification without a transformer. Please suggest it with a moderate cost. And also I need one more clarification. I am using "Constant Voltage" - trickle charging method to charge the battery. I am using a load of 2 lamps of total 110 W lamps which stand for around 50 minutes of full charged battery. The lamps will cut-off at 9.5-9.8 V. Then it takes around 16 hours to make the battery full charge. Could you please confirm me if I can charge the battery soon (min 6 hours). Is so at what rate I should use the load. Please help me in this situation.                                      I mention the website link which I am currently using for charger circuit.                                     http://www.circuitstoday.com/lead-acid-battery-charger In this circuit, I am using a 16-0-16 transformer to convert the line voltage of 230V ac and bridge rectifier diodes to convert it into dc. Please suggest me a circuit without the application of transformer to convert 230V ac to dc.                                         My mail id is tvibakar@gmail.com. Thanks, Thomas.

Question by tvibakar    |  last reply


I broke an LED; will connecting the one wire leading in to the wire leading out break the device?

I have a broken LED. Will connecting the wire leading into the LED to the wire leading out of that one LED break the device? I don't have solder so my plan was to twist together the stripped wires and wrap in electrical tape. Would powering on the device cause any sparks? The LED is part of a group of LEDs in a ring around the cone of a hair dryer. There are wires leading up to this ring-shaped circuit board with six leads and a resistor. Would directly connecting the two wires leading up to this ring-shaped board break anything or potentially be hazardous if operating the hair dryer? Now that I think about it, the electrical tape would not be a good idea as it would probably melt pics: http://i.imgur.com/pSmSvUc.jpg http://i.imgur.com/X7GUoDn.jpg

Question by guyersky    |  last reply


Where can I get lead (Pb)? Answered

I'm making a clock and I need 4 pounds of lead for the weight. I was thinking of melting some fishing weights down to make some ingots. Do you think that's good enough?

Question by iPodGuy    |  last reply


How can I test for lead in paint? Answered

I currently live in China and am thinking about painting my apartment, however I am bit nervous about getting a paint that isn't lead-free. My Chinese speaking/reading abilities are still infantile, and even equipped with the means to ask about the paint I fear the reliability of the answer. Call me an empirophilic westerner, but I would much rather test the paint for myself. Is there a simple test (possibly household chemical) that I can perform to help me out?

Question by rasputinsauntie    |  last reply


How do I determine if something is lead?

I found a hideously fake £2 coin in my change, I bit into it to double check and it left a noticeable tooth mark (also upon closer inspection the gold bits were rubbing off and it had an overall wedge shape to it). Because it's nice and soft and now worthless as currency, I thought I'd try that turn a quarter into a ring instructable with it. After only a few taps I saw a noticeable difference and it now occurs to me that it's probably made of lead. Bottom Line: - Dulled silvery metal - Very soft (can leave toothmarks if I bite hard) - Need a definite way to tell if it's lead before I attempt to make a ring out of it. I know it's not gonna kill me unless I keep attempting to take bites out of it, but I'd still like to know, thanks. (also I don't have access to any chemistry equipment for proper tests)

Question by madmanmoe64    |  last reply


Converting a 12V Lead acid to a hydrogen generator? Answered

Is it possible to take a 12V lead acid battery, remove the acid from all 6 cells and replace with water and connect to a 12V power source, and get H2 and O2 gasses bubbling out the top? The reasoning behind this question is that the 12 volt lead acid batteries are made of 6 cells, each producing about 2 volts, connected in series.  If instead of producing 12V we could (by removing the acid and replacing with salt water) feed it 12V, wouldn't we have 6 hydrolysis cells running at 2V each?   6 cells of 2V hydrolysis cells is nothing new, but has anyone of you ever tried to convert a lead acid battery before? Is the lead going to be any good as electrodes? Will the lead oxidize too fast? Will the there be any chemical reaction that would change the produced gasses? Should I be worried about lead poisoning for even typing these words? Should I be asking anything else I haven't thought about? Thanks!

Question by Morgantao    |  last reply


how to charge 4v lead-acid battery?

Question by pj2012    |  last reply


Global Warming Leading to Possible Beer Shortage

According to Treehugger, a warmer climate is leading to shortages in hops and barley. If all of it keeps going in the same direction, beer will be getting more expensive to make and nobody wants that. Link

Topic by fungus amungus    |  last reply


I'm looking for a lead free soldering station.

Hey everyone, I'm looking for a lead free soldering station. I have to do some soldering/desoldering at work and I'm having a problem. The solder on the board is too high of a temp for my trusty Radio Shack soldering iron. To date I've purchased a 50watt iron and I would say that almost did the trick. But, desoldering was a fail. So, I would like to get a professional strength iron that can do the work without breaking my budget ($120). At this point I don't know what to look at 60 or 70 watt or 80. So, if anyone can recommend a good digital lead free solder station? Thanks Everyone!

Topic by ChrisMc74    |  last reply


Charging mobile with a 6V lead acid battery?

Hello, I want to make something like power bank. i want to charge my mobile with a 6V 4.7Ah battery. My mobile charger is rated 5v 500mA. How to make this circuit?

Question by Rahul Mitra    |  last reply


Torque to linear thrust through lead screw

Hi,I am trying to figure out maximum linear force I can produce with an electric motor through use of lead screw and nut. I have come up with an equation which seems correct but resulting forces are way higher than my intuition believes is correct.I tackled the problem from the perspective of energies:F' * p = M/r * 2*π*rlinear force * thread pitch = torque / radius [M/r = force at radius] * circumference of lead screwF = 2*π*M/p * (1-k) //k stands for coefficient of friction between lead screw and nut)Radius falls out of equation, which seems fine as force is provided by torque, which is radius agnostic. I used a 7€ stepper for source of torque which can provide 0.42 Nm of torque and a lead screw with 8 mm pitch and 4 mm radius, I assumed 15% losses. My equation tells me that such system can provide 280 N of force, which seems wayyy too much for a cheap motor.I have attached a python code that calculates linear force in case it helpsCan someone tell me if my equation is either correct or flawed?

Topic by ptkrf    |  last reply