Battery Power in a Taser

Hey, I'm making a 'Glove' Taser using a disposable camera and I wanted to know a few things which most people who read this will laugh at. Firstly, I wanted to put a stronger battery into it and wanted to know what the best battery to use was, keeping in mind that I wanted it to be hidden so I can't use C or D batteries or anything like that. And secondly whether by soldering more wire strands to my contact points (the hurty bits) whether it would carry a greater charge? ie, if 5 strands of copper wire carries 'X' charge then maybe 15 strands would carry '3X' charge. Any help here would be a huge bonus and when I make my Instructable on my Glove Taser I'll give credit to anyone who tried to help me XD

Topic by grantdevine   |  last reply

Solar??? Batteries??? controller???

I want to get these 12v solar battery chargers they come with alligator clamps to hook to the battery. i want to get enough for around 150 volts so how would i hook the solar panels in series, and do i need a controller for each battery? and how would i rig that up and how can I get it going into all the 12 volt batteries without any damage to the batteries etc. And can this be done for less than $400 if the solar panels are $30 each and the batteries are $14 each. THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!!  THANK YOU!!!! oh and could you give me links for all the stuff I'm gonna be buying. THANKS!!!!  

Question by jimmerforpoy   |  last reply

How many milliamp/hours is a duracell 6 volt lantern battery? Answered

How many milliamp/hours is a duracell 6 volt lantern battery?  I can't find this info anywhere on the web.  Thanks.

Question by Noblenutria   |  last reply

I want to run my 12 volt power tools ( ridgid ) using a 12 volt lead acid battery

I have been doing this for years and I finally found this line of tools that is small and compact and the battery fits in the handle and it has tons of power  the lithium ion 12 v ridgid drill and job max line. I tried to wire up the tools contacts to the small lead acid batteries I normally use and even a full size car battery but it failed to power tool because there is this small contact that the tool is requiring which the lithium battery has but obviously the lead acid does not.  I do this for heavy duty use such as continual sawing and sanding and things like that.  any suggestions I really need to make this work as I run a mobile business.  I am looking for a solution to over riding the need for that extra contact and I am fully aware that I will void the warranty as many of you may be thinking. Please help 

Question by captainj954   |  last reply

Where to find a small form factor 12v Battery?

I am looking to build an LED light that can be powered directly by a 12v source or use an internal battery. I expect that the fixture form factor will be about 4" in length by 2" to 2.5" in width and no more than 3/4" in depth. Internally, it needs to fit two LED units (each draws 0.1-0.2amps and only one would be on at a time) that are 1"x1"x5/8" each, the inside component of a single pole double throw waterproof switch and the remaining space for batteries. I would like to fit the maximum amount of available capacity as possible in as small a space as possible. I am looking for battery suggestions - small form factor, 12v, preferably available via a regular source (i.e. don't have to be special ordered from China), low self-discharge rate, ability to withstand temperature extremes (specifically 120F-140F degree heat). I'll consider wiring up batteries in parallel and serial to get the charge depth and the proper voltage. Any thoughts? I looked at A23 12v batteries and 2CR-1/3N 6v batteries (wire in serial) but I'd like to find something with more available capacity. Also, I'd prefer a non-toxic battery, but will consider lithium, and the ability to be recharged would be a big bonus. I'm guessing there's nothing out there that would give me enough life to be happy, but I thought I'd ask. Thanks!

Question by kcls   |  last reply

how to know if a battery is charging? Answered

I want to know if my lead acidic battery is charging.can i use a volt meter to know that ?and how?

Question by tarz_00   |  last reply

Connect engine to alternator, will it run?

I have a new diesel 3 H.P engine and an 80 amp car type alternator, 12 volt. A, will the engine run the alternator at full output to charge batteries? B, Can I fit a bigger pulley to the engine? Regards Brian.

Question by trebby91   |  last reply

circuit diagram and parts to repair 24 volt 20 amp battery charger uses Scr's?

I have a MAC 242011 battery charger  ( 24 volt 20 amp automatic battery charger I need a source and a cct diagram to repair . the Scrs are not working . can you help ? I am in Ottawa Canada tel cell leave txt message 613 291 9942

Question by PaulTieTenQuee 

Solar charge circuit question

Hi, I have a 12 volt / 0.5 watt solar cell and I am hoping to charge a 9 volt / 200 mAh rechargeable battery with it. I think I have a suitable diagram for the circuit here... I was wondering if using a 12 volt cell was ok for charging the 9 volt battery? Would I need to add resistance to the solar cell to bring it down to 9 volts? If so where would I add the resister to that diagram? If it's relevant, the load will be a fan. Thanks.

Topic by horsebones   |  last reply

With 8.5 volt r/c battery, i want one 3 volt light. What size resistor do i use and from where to get it?

I tried hooking up the 8.5 volts direct of course it torched the light.  I want to wire this light, or perhaps two of them to the 8.5, 3300 mAmp battery from the picture, this battery is about as long as a smart phone say if that even matters.  Please someone can tell me, what resistor to use, where do i get it, and how do i hook it up?  Thanks for help

Question by marcs3   |  last reply

How to solder ni-cad batteries together for battery pack.

I want to replace a bad battery in an eighteen volt pack, but can't seem to get the solder to adhere to ends of battery. I thought about welding, but don't want to damage batteries. Any suggestions.?

Question by mangelox   |  last reply

need help on how to wire 4 36 volt dewalt packs and 2 a123 2s2p packs in parallel.

I need help wiring up 4 36 volt dewalt packs and 2 a123 2s2p cell packs in parallel. . Will somebody please help ?My bike is a 36 volt red lee  iococca ebike.A diagram and any advise that could help will be appreciated. Thank You.  elvisbrown.

Question by elvisbrown   |  last reply

where to find temp sensor for 18 volt batteries? Answered

I  work  for a  company that  has  a large  amount  of   cordless drills  adn saw alls  and power  tools. I  have been ask to   see what  it takes to repair the    battery  packs .  I have  a few  questions  i would like to ask if  someone  can help me with  ? 1.  Where  can   one  find  the  temp  sensor  switches   that are  on  the    milwauki red lithium  and   dewalt  18 volt  nicad  battery  packs. 2. does anyone  have  a better way  of    building them other than  soder  each  battery.? I found  a battery spot   welder  but it is  like  $5,000 bucks.  Take  a long time   to pay  for that.   I  soder  my  rc  battery  packs   but  just looking for a better  more cost effective way. Thnaks for any help anyone  can  give. Andy

Question by andy1917   |  last reply

Convert a 13.2 volt tool to 110 ac? Answered

I've got a Woodzig (a super-mini chainsaw) that no longer takes a charge. It's also no longer made.   I'd liker to get out of battery mode altogether. How hard would it be to convert it to ac?  I've emptied a battery pack, so I have a shell with a red wire and a black wire that snaps onto the bottom of the saw. 

Question by mole1   |  last reply

How many Volts can a 1.2V Nickel-Cadmium battery take?

Hi! I (still) need some help with building a solar charger... I want to charge a Nickel-Cadmium battery (1.2V) with solar cells from a garden light. Unfortunately these cells give me 5V in full sun... Will the battery take the 5 Volts without damage? The amperage is fine, so no questions about that...

Question by Fypsigon   |  last reply

Parrallel Load to a Charging Battery???

This is not an instructable but a question. See the images for circuit here the 9v battery represents a 12 DC V from an Adapter and the Capacitor represents the Chargeable Battery. Diodes are placed before Chargeable Battery and LED in the direction of current to prevent current in opposite direction. Suppose I have a Chargable Battery of 9v, A 12 Volt adapter (12 volt to charge 9v battery), and a segment LED Strip (3 LEDs in Series.) Now I connect discharged 9V Battery to LED, and adding the 12V DC Input in Parallel as well. I want 12V DC source to charge Battery and Light up LED. I will add protection Diodes as well in positive terminal of led and battery so the current wont flow from the battery. Will the LED light up at 12V at its full intensity? I found somewhere that while a battery is charging, adding something in parallel will draw less current at first and then the Amperage will increase with increase in battery level and then after a lot of time, it will draw as much as current as it would in 12V directly? Is it so, how can I avoid it, i.e, I need the Load (here LED) to get 12 V while that same 12V source should charge the Battery. Sorry for any grammatical mistakes because I am in a hurry. Please answer me. Thanks.

Topic by The Engineer Pro - Mohammed Ayaz Quadri   |  last reply

my nichrome wire won't heat up!!!

I was trying to make a foam cutter so I connected a 4 inch long piece of nichrome wire in series with 4 D batteries and the wire got very hot.  My batteries became worn out and I replaced them with a 9 volt eveready battery but it didn't heat up. I tried shortening the wire up to just a centimeter but still nothing happened. I was wondering if current is even passing through the wire so i wired an electric motor in series with the nichrome wire and the battery, and the motor was spinning. I also tried using two 9 volt batteries in series and in parallel but still nothing happened. I am really confused.. why can't 9 volts and 18 volts heat up the wire while 6 volts(4 d batteries) can??I connected the two 9 volt batteries in parallel too but why didn't it work?

Topic by crazyivanux 

Spot welding 1.5V battery tabs Answered

I'm trying to spot weld battery tabs for rebuilding a Nicad battery.  I'm using a 12 volt SLA battery for power.  When I touch the leads they get so hot they burn the tabs, but the weld doesn't penetrate the battery.  What am I doing wrong?

Question by johnnytombstone   |  last reply

understanding the basics, what’s more important volts or amps when charging a battery from a generator?

I am getting confused my high school electronics is being tested, i passed by the way ;) . I want to make my own electricity from solar and wind to charge up some batteries. What voltage must my system produce to charge two 12 volt batteries? In my wind generator I envisaged using a stepper motor, with this it is possible to use a voltage doubler circuit. The article I read on stated that if you doubled the volts you halved the amps.   So to get to the point, which is more important volts or amps? And why?. (please)

Question by chocsoya   |  last reply

How long will 3528 LED strips drain a motorcycle battery?

The battery is a duraboost battery made for ATVs and is in a YFZ450 (sport quad). The battery is 12 volts and so are the LEDs but i am afraid that the LEDs will drain the battery or just blow the LEDs from all the current it has to offer. They need .4 amps per meter and I am using about 4-5 meters. I want to know if i must make sure I have a full battery and how long i have until i get low on juice.

Question by hopekiller30   |  last reply

Ni-cad Battery repair/regeneration how do I repair/regenerate my dead Ni-cad power tool batteries?

I have several Ryobi 18 volt Ni-cad power tool batteries that over the years have lost all their ability to recharge.  is there a way to fix/disassemble and repair without having to buy all new ones?  I have about 5 or 6 and do not wish to replace everyone of them.

Question by jwrape64   |  last reply

Would a 700 watt electric motor be sufficient for my needs?

I'm have started building a small electric cart, I plan on using 2 350watt motors to power it. I estimate the final weight of the cart (with me on it) to be around 250 pounds, would these motors be able to effectively propel the cart? 

Question by NoNameCola   |  last reply

I can find videos of 18 and 14.4 volt DeWalts hooked up to car batteries. Why does it not work with my 12 volt?

not any details to give, followed various instructions that end in nothing happening

Question by Andale_The_Great   |  last reply

Solar power questions? Answered

I have this same solar panel 5 watt 12 volt panel And a 400 watt power inverter. What type of lightweight battery should i get? (12 volt, something amp battery)

Question by alpe_97   |  last reply

If I hook the 12 v motor from a car air compressor to a crank and the wires to a battery, will I have a hand generator?

I know you'd need diodes, but would I be able to charge a 12 volt battery with something like this (kinda like in that videogame Metro 2033 where you have a hand powered generator- coolest thing ever)?

Question by Funk_D   |  last reply

A 15 volt Solar panel powering 12 volt dc bilge pump with no battery. How long will it stay working?

I did a little maker faire project to demonstrate how gravitational vortex power plants work. There was no electrical outlet available so I used a 15 watt solar panel to power a 12 volt 600 gallon per hour bilge pump to keep the demonstration running.  During the maker faire numerous people came between the sun and the panel and the thing stopped and restarted no problem.   I would guess that the bilge pump was running at half strength. (It has a 3 amp fuse so that would mean 36 watts is the max it can do?  An electrical engineer and a computer science student both said that I could probably leave the thing connected day and night and the low evening and morning current would not damage my bilge pump (or the solar panel).  It would just start up whenever the light got bright enough. Would anyone like to confirm that? Also, is there any arrangement with capacitors so that even the morning or evening sun will turn the thing (even if slowly) or is there a way to shunt that weak power to something useful (Like electrolysis of sea or  salty water to make bleach) and then go back to the bilge pump whenever the sun is powerful enough again? I would love to know because the project went really well and more could be done with it. Brian

Topic by gaiatechnician   |  last reply

What powersupply or charger should I use?

It is for a battery pack for a cordless drill made of good sony high drain cells from "died" makita packs. It is for another drill then makita. I found this bms: Should I use an Imax charger, or a regular notebook charger, about 19-21 volts?;=item43cbb93aaf

Question by rnijland   |  last reply

How do I convert an AC device to run on a battery pack?

I have a device that runs on ac (110-120 Vac - 180w). I want to make it portable so that it can run off a battery pack such as AA or 9 Volt or even a custom battery. Is this too much of a power requirement to make it possible??? thanks in advance for your help.

Topic by gadgetcrazy   |  last reply

is there any ways i can powered my 120-220 volt ac motor from 24 volt battery in a cheap way? Answered

Here in my country i cant find any DC motor so i wanna try AC motor for my electric car

Question by Suraj Basnet   |  last reply

AC adapter reuse-Charge My 18V. Dewalt Battery??

I've lost My Stock DEWALT Charger . I have Several 18 volt A.C. adapters - Is There not A way to Make  a charger out of one of The adapters?

Question by Psyber-kenetic Lucidity   |  last reply

My actuator died after just 2 months. Was the relay the villain?

I set up a linear actuator on a timer with a relay and 12 Volt 5 Amp battery exactly like to project you show on your site. It worked like a champ for about 2 months the stopped. I thought maybe the battery need a recharge but that wasn't the issue. When the switch opens and remains open the red light on top of the relay remains on. I keep the door open for about 4 hours in the morning then it closes. It opens again for about 4 hours before dusk then closes again until the next morning. My concern is that the red light on the relay is indicating that the switch is on continuously sending electricity to the actuator. After 2 months it just fried the actuator.  I took apart the actuator and it looks like its brand new with no black spots on the copper wires. I'm hoping I just have a bad actuator.

Question by Joenjmortgage    |  last reply

can I use two 24 volt ac stepper motor wind generators connected together to charge a 12 volt battery

STEPPER MOTOR SAIA 24VAC 60Hz 1.5W MOD # UBR2UG4D30CNN3E       * NOS   * Model # UBR2UG4D30CNN3E   * 24Vac,    60 Hz,    1.5W   * 009,    30s,    3.9uF   * Dimension: Diameter 1-3/8” x Depth 3/4” here are all the specs i could find not too sure what they mean. i read somewhere on the internet that it would be best to use a 50 volt one, so i was wondering if i connected them to together positive to negative like in a solar panel or all the + to the + and - to the - on the battery if this would work. i know you need to change the ac to dc

Question by chocsoya   |  last reply

Alternator use and output

Hail the reader and Bless the respondent. please can someone tell me the following 1. At what speed must a normal vehicle alternator turn to give max output... and what is this out put... I see my charge meter shows it charging at 10 amps... how long to fill the battery at 10 amps? 2. A pack of 6 12v truck batteries connected to make 1 big 12 volt battery... is it possible to charge this pack from more than 1 alternator and will it speed up the charge time to make the battery full to max?

Topic by carnut34   |  last reply

Advice about high torque motors ? Answered

So recently I've been wanting to to build some kind of electric mini car/gocart but I have no idea about battery and motor requirements. Basically what I want to know is what would be some battery and motor requirements for such a vehicle, I need to know how many volts, amps, rpm, amp hours, kg per sq cm, motor type etc. I know I'm asking a lot , probably way too much but I'd be really greatful if I could obtain even some of this information.:-)

Question by DIYWEAPONS   |  last reply

I need help building a 1.3V solar charger from garden light cells?

Hi! I need some help with building a solar charger...I don´t know much about electronics, maybe one of you has the patience to answer a few questions? The device I want to charge has a label that says 1.3V=2W (there is 1 rechargeable Nickel-Cadmium battery inside), the wall charger is labeled 1.3V=1500 mA... I have 2 solar cells from garden lights, they both were used to charge two 1.2V batteries with 600 mAh (in series). That´s all I know about them, I have no way of measuring the output... My questions: 1. How many Volts (at least) does it take to charge that device? 2. How many Volts can the battery take without getting damaged? 3. How many Volts do I usually get from those garden light cells? If they charge 2 batteries (1.2V) in series it should be 2.4V, right? 4. If 2.4 Volts is too much for the device, how do I limit it? I would like to build the charger without buying a multimeter and the parts will be salvaged from other stuff...I hope... I know those are a lot of noob questions but I would really appreciate your help!

Question by Fypsigon   |  last reply

Can I power a large inverter with many of those external solar batteries for phones?

I'm looking for cheap solar + batteries to run the air conditioning and other electronics on a boat. If i order those external 4600mah solar battery packs that are meant to power your phone while hiking, I can get them for fairly cheap from China.  I'm looking at an inverter online that outputs 1000w, it takes 12v input. Assuming standard usb output of 1.5 volts, does this mean i wire 8 in series as a set which would draw 100amps/hour, so for each 8 battery set it would last ~150 minutes(1.5A output per battery, 4.6amps capacity) at load? How feasible is this as a long term solution (multiple charges and discharges)?

Question by tsukasa1105   |  last reply

can i use 500 watt juicer and mixer motor for electric bicycle?

On motor specification it is written 500 watt , 50 hz ac motor , but when i plug it in 12 volt dc battery it runs slowly it can stop it with hand but i hope in higher dc volt it will run enough to use in my electric bicyle. it is philips juicer and mixer and grinder purchased from india

Question by Suraj Basnet   |  last reply

What would happen if you used a 24v battery pack in an 18v cordless drill? Will this damage the motor? Answered

Thinking about overclocking some of my 18v power tools.  I can adapt 24v battery packs to fit into them.  Obvious advantage is they will run faster and should run longer with the extra power.  My only concern is can this damage the motors?  I think the only real risk is overheating but it I take steps to avoid that would everything else be okay?  I've also considered hooking two battery packs together to run an 18v saw at 36 volts.

Question by etcmn   |  last reply

Hybrid electric vehicals, batteries going serial or parallel

Can I wire 7000 lithium ion battery cells (about 75kwh) in parallel, and then use a lightweight bike engine hooked to a DC generator and connected in series to the batteries to boost voltage? Are there any flows in this design concept, for use in a hybrid race vehicle to increase the longevity of the batteries?I am trying to develop a race track car which is hybrid, thus utilizing electric motors immense torque.We build original race cars with common petrol engines but now I’m seriously thinking of developing a next generation race car. I know batteries don’t last long in high drain situations and thus any race car I sell will need a battery replacement after a race season. I’m sure this will be bad for business. Thus this is why I’m thinking of ideas to prolong the battery life by reducing current drainage. That’s why I want to have an engine generator with its sole purpose is just to boost voltage, and about 20,000ah worth of batteries connected in parallel so I reduce current demand per battery cell to well under 1C. Giving a Tesla p100d as an example I would require about 1200 amps and 400 volts to produce 480kw of power. If wire all 7000 battery cells in parallel to produce the same amount of current then each cell will need to provide about 0.18amps that’s very low to sustain longevity of the batteries. The generator is then connected in series to help boost the system voltage to 400vIn extrem simple terms, (the batteries provide the current, and the engine generator provides the voltage)I hope you understand why I’m looking at it this way. I know it might not be the most efficient way, but is it a practical doable way? Thanks

Topic by SamA196   |  last reply

Increasing current for hho cell?

What is the simplest method for someone like me who has very little experience in electronics and a low budget, to achieve a high current output for a hho cell? This is for a hho cell and torch so the voltage must be low and the current must be high. Basically what Im looking for is a cheap and easy way to create 3v -5v together with 10-100 amps. Are there any specific household appliances that can put out this current? Not car batteries, car battery chargers or wall sockets. Also is this enough to kill you or just give you a bad shock?

Question by mitchells   |  last reply

The battery on my Volvo keeps dying. How should I determine and fix the problem? Answered

I have a 1996 Volvo 850 GTL Wagon.  We drive it infrequently, averaging 2 trips per week.  If it isn't driven in 10 - 14 days, the battery will invariably be dead, and I'll need to jump start it, or charge it with a trickle charger overnight.   At first, I thought the battery was worn out even though it was wasn't quite to the end of its warranty period.  I replaced it, but this didn't solve the problem. Next, I thought our typically short trips weren't allowing the battery to fully charge, so I specifically changed my driving habits and used the trickle charger to top up the battery on a regular basis.  After doing this, the battery would measure in the 12.3 to 12.6 V range, but after two weeks without driving would be again be dead, measuring in the 11 V or lower range.  Even after needing a jump-start, the battery will start the car again after just 5 minutes of driving. I've measured the steady-state current draw from the battery after the car has been off for several minutes to several hours using both a clamp-on style ammeter (<0.1 amps; lowest the clamp-on could measure) and an inline current meter between the negative terminal and the negative terminal's clamp (40 mA). 40 mA seems reasonable from what I can find online, and shouldn't be enough to drain the battery over 2 weeks.   So, I have an 11-month old battery that won't hold a charge for two weeks, and I'm fairly confident there's no abnormal current draws from the car.  Should I replace the battery again and hope for the best?  Is there any truth (and references!) to claims that a lead-acid battery once drained too low can never recover? Updated with new information for the various suggestions below: After fully charging the battery, I disconnected it for 48 hours.  It remained at 12.6 volts over the entire period, and when I reconnected it, easily started the car. I don't suspect the alternator:  When the car is running, 5-6 amps flows into the battery and the voltage on the battery is 13.6 V; and if I drive the car once or twice a week, the battery never dies.  I do suspect something with the keyless remote.  I stopped using my keyless remote years ago because I found it too bulky to carry around -- I lock and unlock the car using the key in the door.  Christy still uses her keyless remote.  Recently, she was the last one to drive the car before we went out of town for 10 days.  When we got back, I was positive the battery would be dead, but it started the car without a problem.  So, I ran the experiment of leaving the car unlocked, locked with the key, and locked with the keyless remote.  After a few days, the battery would be dead when locked with they key, but not when locked with the keyless remote or left unlocked.  Frustratingly, I've checked the current draw in all three configurations, and it's 40 mA in each case (and stays that way for several minutes).  For now, I have a solution that keeps the battery from dying if I don't regularly drive the car, but I'd still like to understand what is going on. Updated with solution 2010-09-02 At the car's next regular service, the shop recognized the problem.  On cars of this type and age, the crimp on the positive terminal can fail turning the positive wire to the battery into a resistor rather than a wire.  This is diagnosed by measuring the charging voltage on the battery and giggling the wire (it will jump around, and not remain at the required 13.8 V), and by noticing that the wire itself is hot.  Volvo recently released a fix for this, and previously the shop had to remove the entire wiring harness, at great expense, to fix it.  So, my battery was never getting fully charged, and I've selected the best answer from among the suggestions that my measured charging voltage was too low.   

Question by ewilhelm   |  last reply

What kind of motor or device could I use to turn a bicycle real wheel?

Want to build a bike on a 18 or 36 volt battery(18 preffered) but having a difficulty finding a device I could attach to have it spin the wheel, ty so much for the help

Question by JorgeV154 

Electric Go Kart with Graphene supercapacitor. Random Questions on electronics, control, and possible problems.

I have a project in mind that i am trying to start on and it all has to be done as cheap as possible (ACAP). The project idea is that after my graphene in finished and I make the capacitors I will construct the battery and group the many cells in series and parallels until I have either 36 or 48 volts and a lot of amp-hours or at least enough to drive the kart with unrestricted speed for AT LEAST 10-15 minutes. The big question I have is whether i can treat these, essentially fast charging batteries, as batteries or if I must use different methods to control power and connect to the motor.  Then I also don't know how exactly i am going to control the motor or even what type of motor to use and where to obtain it. I was thinking i could use some industrial PMDC motor and I would like to control it using a PWM and use a plate that a contact touches that would slide up and down the plate to make the contact closer and farther away from the end on which a cable would be attached so it varies the amount of resistance to make a potentiometer. The closed throttle would just be a button that the pedal pushes to disconnect the power to the potentiometer at another point in the wiring. If that actually works then how would I make or where would I buy something that could actually use that and be able to handle thousands of watts (like 10,000W @36-48volts minimum).  My other throttle idea was that i could just have the pedal activate multiple solenoids so that there is like 5 stages of power activated by the solenoids. I have heard that problems with this is that when the first battery runs out you have to charge it otherwise it will be destroyed, though i am not sure if this will affect the graphene supercapacitors. If anyone know anything about graphene in applications please let me know because that would be way easier. The last thing is that since the graphene will be made on disks by laser scribing them could i just make the cells the shape of CD disks and then put the in one of those disk holders and then wire those to each other in series until i have the desired voltage and then in parallels until I run out??? If anyone has made graphene cells and used them please tell me where u obtained the Graphene oxide and how you made the graphene and cells and etc.

Question by hopekiller30   |  last reply

DC Motor

Hi Guys, I have a 15.6 volt dc motor taken out of a handheld vacuum cleaner. is this suitable to use in a small wind generator as a project with my kids. when i attach it to a power drill and spin it from the shaft i dont seem to get any power generation. If i connect it to a 12v battery is spins real fast. any help would be appreciated sam

Question by sam301   |  last reply

Trouble with homemade Solar Charger for AA AAA Batteries. Parallel issue? Answered

So I decided to make my own homemade solar charger to charge Double AA and Triple AAA batteries and I have been having issues and don't know what's wrong since I have made one before. Maybe this one is too complex? I had bought 3 cells online for just under $4. Each one generates approximately 2.3Volts at 150Mah. Together in parallel they should generate about 450Mah in full sunlight, correct? Well, I had already tested them and they did work fine, I gave a small charge to a single double AA and success. I put it all together with the cells, wires and battery compartments and the one way diode. (Use photograph for reference) Once complete, I had put 2 AAA batteries in. Put together they only require 400mah total to charge or just less then an hour. But when I took them out, they didn't take a charge at all....if anything they drained right dead. I thought maybe the diode was backwards but that wasn't the case either. Finally I took a multimeter to it and although it was getting over 2 volts easily, the amps were only showing 60Mah total. Not even half of what one of the cells are capable of. I did have it in full sun too, so there must be something whacky wrong with my wiring. Can anyone spot a possibility of a mistake or do I just have bad luck? I have worked with full size solar panels (100watts worth) and never had an issue like this before. Any ideas? Thanks! P.S. Is it possible that the positive and negative have to come out of the same cell? I am not sure if this matters since this is in parallel. I don't have a lot of time on my hands lately and I was hoping to get an opinion before changing something unnecessary. Thanks again!

Question by Smizz94   |  last reply

How can I make an AC adapter that will fit a standard 1/2" drive 18V DeWalt drill?

I am sick of buying batteries or having them not stay charged very long. How can I make an AC adapter that will fit a standard 1/2" drive 18V DeWalt drill. I want to drop 120 volt to the 18V (with lower amps?) and do it in a hollow battery house so it will take the place of a battery when I run low on charge. You would think a cordless drill company would offer something like this as an accessory. I bought a cordless drill for the convenience, but 9 times out of 10 I am still close to an outlet. If I don't get an answer here I will just go ahead and figure it out on my own. But I really don't want to have to re-invent this wheel if someone has already done this.

Question by bobhdus   |  last reply

Induction Motor Help?

Hi guys i have come across an induction motor out of a treadmill. it states on the lable that its single phase induction, 240 volt, 4 poles 3/4 hp. 1.7 amp 1420 rpm. question 1- is there any safe way to see if it works question 2 - can it be used for a small wind generator to charge 12volt batteries to light a shed question 3 - is best put in the trash where it came from any assistance advice would be appreciated

Question by sam301   |  last reply

How to construct a timing circuit for a LED lighting circuit.?

I am new to electronics but a quick learner. I have a dark path that I want to illuminate for about 2 to 3 minutes using a commercial LED light. It is too far to run a 120V line, so I am hoping to use a 3 - Volt Lithium battery connected to a timer that will shut-off the light automatically. I cannot use a motion sensor as the path is lined with trees that would set it off during windy sessions. I am hoping to be able to push a normally off button, have the LED bulb illuminate and, after I have walked past the darkened area (2 to 3 minutes) automatically turn off, I need two units, one at each end. Also, can I adapt the lighting system to solar power? I really don't want to replace batteries often. Can anyone help me. I can solder, follow a diagram and instructions. I will enclose the unit and make it as maintenance free as possible. If my choice of battery power is wrong, please advise me on any improvements. If  there is a commercial timer available please let me where I can buy it incase it's too much for me to build. Thank you.

Question by hbiles   |  last reply