how to keep 3 volt instead of going up to 6 volt

Hi, i have a honda camino , i want to make a rear light. first how do i get the 3.0 volt staying on 3 volt ac and what do i have to do if i use four bright white led in parallel,i have to have 5 watt in total.

Posted by alex4421 10 years ago


Illuminating Experience

Thanks to Andy-b and Joe for the 12 volt light ideas. I wanted to illuminate dug bottle shards embedded in home-made cigar box guitars. They have given me the means. Companies are selling similar lights for $29.95. Crazy!

Posted by trampart 10 years ago


How to get 12 volts from 18 volts

How would i regulate 18 volts(2 9v batteries) to put out 12 volts instead? im doing this because 2 6v batteries is really heavy(im replacing 2 6v batteries, and they are also broken... dont ask how) thanks

Posted by ledzep567 10 years ago


multi voltage project for sons project

Hello I was wondering if someone can help us. We are building a school project that has 3 different lights on it. what we are trying to do is have everything work off one 12 volt plug in transformer. What we have is a 12 volt dc transformer for 2 led drivers and a 6 volt ac transformer for a turning table. We want it all to work off one plug-in style transformer. How can we do this and conceal the components in the base. Please help us. Thanks for any help.

Posted by chrisunderwood 3 years ago


voltmeter and ammeter

Hi guys, could someone help me with this thing,

Posted by mammotz 6 years ago


Solar page ad takeover.

The "Solar" projects page is pretty much a Chevy Volt advertisement.  A video about the Volt is set to auto-play for every "page" of instructables... of which there are only 5 shown.  I understand that websites need ad money to survive, but when those ads dominate the page and hinder the user from accessing site content it borders on ridiculous. When I click next page I'm greeted with the same giant, auto-play video ad and only 5 instructables.  I find this irritating. -Tom

Posted by tomzook 7 years ago


Resistors for a project, easy question!

Hi all, This is an easy question about resistors, its been years since I use any. So, I have a replay which is rate 12v DC and 2amp. The power supply is 12v DC and 6 amp. V = I X R R =  V / I so R = 12 / 2 = 6ohm So I need a 6ohm resistor? Is that correct? I can't believe I have forgotten this! thanks Gary

Posted by garynobles 5 years ago


120 volt flasher circut

I need some help finding a way to flash a 120 volt incandescent light bulb. Im looking for a way and have found close to nothing. if any one can help, thank you

Posted by newwarhammer2 6 years ago


nichrome wire

I got some nichrome wire off eBay, and it works great but when I connected it to a 9 volt battery it barley got hot, then I attached it to 4 x AA batteries and it got red hot. why is this? I don't understand because the 9 volt gives out 9 volts(duh) , but the 4x AA batteries only gives out 6 volts.

Posted by Jordo 10 years ago


variable load DC volt meter?

I would like to build my own one of these with more settings and variable load and input voltages. Maybe someone has a more elegant solution? Something that would fit in a small box or maybe even a something to put in between the DC source and my multimeter Voltmeters

Posted by Menthol 8 years ago


24 volt motor run time

Hi all, We just finished a remote control lawn mower project that utilizes 2 24V wheel chair motors and two wheel chair batteries for drive power. The balde is powered by a gas engine. The unit weighs in at around 260 lbs and is used for some serious slope mowing. The issue I have run into is that I can only get about 1 hour run time before having to recharge. Does anyone have any suggestions as to how to increase the run time without decreasing power? Thanks

Posted by real57vetteguy 5 years ago


question about thermal fuses

I have a blown thermal fuse in one of my fog machines,it is 10 amp 250 volt 133 degrees c.can i by pass it safely?(there is high temp limit switch on heating element)or can anyone tell me where i can get one or its equivalent?i found some online but they in thailand.hoping someone who knows more than me can tell me where to get this locally.the blown fuse has some numbers on it :se fuse sf129 e tf 133 degrees c please help

Posted by hvacmac 8 years ago


Fun withTransformers

Connect the output of 2 transformers in series...  12v  +  6 v. much as you would connect batteries in series. will it burn out?  will it produce 18 v as one would expect with batteries?......... 18 volts!!  yay!   hasnt burnt out( YET)... i wont leave this unattended. transmission of power is more efficient at high v.     sooooo... if i hook the output of a 10,000 v  neon transformer to 2 thin strands of wire( think magnet wire, or a single strand from stranded cable)   and input this  10,000 v into the secondary of a second identical neon transformer, will i get usable 120 v from the primary?  (attempt to run the second transformer in reverse as a stepdown) Nope... not YET.  Suggestions?

Posted by Toga_Dan 3 years ago


I just put this up on the Mythbuster's site......

I just posted the following over there, so hopefully a method can be devised to test this safely: (1999) A US Navy safety publication describes injuries incurred while doing don'ts. One page described the fate of a sailor playing with a multimeter in an unauthorized manner. He was curious about the resistance level of the human body. He had a Simpson 260 multimeter, a small unit powered by a 9-volt battery. That may not seem powerful enough to be dangerous… but it can be deadly in the wrong hands. The sailor took a probe in each hand to measure his bodily resistance from thumb to thumb. But the probes had sharp tips, and in his excitement he pressed his thumbs hard enough against the probes to break the skin. Once the salty conducting fluid known as blood was available, the current from the multimeter traveled right across the sailor's heart, disrupting the electrical regulation of his heartbeat. He died before he could record his Ohms.

Posted by Goodhart 10 years ago


How power 5v security camera from car battery?

Hi, I'm wanting to buy a security camera that has a 5v DC input.  Here's the link: http://www.smarthome.com/75791/INSTEON-Wireless-Outdoor-IP-Security-Camera-with-Night-Vision-Silver/p.aspx?green=530106ED-4EEC-5734-B040-475BB5ECFDCB&utm;_campaign=site_recs&utm;_medium=site_recs&mbpage;=hcat I'm wanting to mount it up at our gate (300ft from house).  Up there, I already have a solar panel that charges a standard car batter and it powers the gate.  I'm wanting to mount the camera up there and somehow power it from the existing battery. Is this easy?  Can I (a total novice) pull this off? Thanks for any help.

Posted by spodppl 4 years ago


12volt battery to 5volt miniUSB

I'd like to be able to charge my MP3 player on my motorcycle, running off the power of the motorcycle. The motorcycle will put out 12.1 volts or so off, and around 14 volts running. What is required to bring that down to 5 volts? Will a simple voltage regulator be enough? The MP3 player will be controlling the amount of current going to it, so I don't need to worry about that, right? Thanks Jake

Posted by jaykup 10 years ago


LED question

I just bought some LED's that i plan to run through a wire on a 9 volt with a push button on/off i plan to run 6 at a time. the green are 525nm 8000mcd and the blue (A SEPARATE SET) are 472nm 2500mcd

Posted by pbpenguin5 10 years ago


Possibility of an 80 amp 12 volt power supply?

I'm just wondering about the possibility of me building one of these? I basically want to power a car amp inside a house. If its possible, how much money would I be looking at? How hard would it be to find the parts? And would I be better off paying $500 for a good home receiver, vs $200 for a good car amp plus whatever the cost of the power supply would be?

Posted by cvxdes 10 years ago


constant 4.5 V supply using batteries?

how may i get a constant power supply of 4.5 Volt using batteries? -------------------------------------------------------------- WHAT I FOUND SO FAR googling and visiting several discussion groups i found related advice ... - e.g. using 1 more than the required batteries in combination with e.g. a voltage regulator, diode, resistor, DAC - if i use 4 instead of 3 aa batteries and the voltage drops after a while - would a voltage regulator, resistor, DAC still provide 4.5V from the remaining voltage? may i ask you what you would recommend? -------------------------------------------------------------- WHAT I NEED IT FOR i am using rf sender/receiver modules with my picaxe 08m microcontrollers & found, that they (and the connected antennas) work best at a constant voltage of 4.5 V

Posted by marc_is_curious 6 years ago


Solar charger in altoids tin for 9v??

Well, if you have seen the altoids solar battery charger, and the altoids 9v usb charger, then you must have thought, "why not put em together???". Now, Im not electronics buff, but I'd be willing to bet that since the 9v charger instructable is so small, that it could be incorperated with the solar panel kit. Now, my question is, would i have to do anything ridiculous to convert the solar charger (which is ment to charge 2 AA batterys) into a 9v usb charger w/solar panel while still being inside an altoids tin. PS: I still don't know why I have this wierd fascination with altoids tin DIYs, but I do...

Posted by altoidsrox 10 years ago


Dewalt battery powered inventions

Hey gang, 1st time, long time. I'm not very savvy when it comes to most things electrical, but have a question about (mainstream) rechargeable battery powered inventions.  In my case, Dewalt 18v batteries, but for arguments sake, it could cover a slew of rechargeables. I have at least a dozen Dewalt 18v tools and accessories.  I've had most of them for years and only the 2 most well-used tools have failed (and been rebuilt).  So I love the reliability.  I 'round-robin' my 6 batteries (mix of the older style XRP and the new Li-Ion), I've yet to have a battery fail and all still hold a decent charge - the oldest XRPs are going on 7-8 years old. I often use my (2) dewalt lights I have as light when the power goes out in the house or when I spend a few nights at the race track (tent camping, but not roughing it like out in the middle of the woods).  3-4 batteries typically do the job for a weekend.  I'm on the fence about buying a Dewalt (charging) radio, but it doesn't seem like it will charge via USB when it's running on battery power.... ...which leads me to my main (ignorant) question: Why don't we see inventions that can be powered by main stream rechargable battery (reliable, safe, readily available, and owned by many people already)? A couple examples include: A device to charge small electronics via usb (Cell phone, tablet, etc).  Smart phones can do so many things now, being able to charge it with existing batteries would make them even more universal (http://www.huffingtonpost.com/steve-cichon/radio-shack-ad_b_4612973.html ) A small fan, something pretty portable.  (yes, I know I could probably rig something up with my drill, but having a dedicated fan would be nice) A small water pump.  (again, ignorance comes into play here)  Not sure what kind of pressure/flow rate is possible, but having it connected to my rain barrels to increase the pressure over my current gravity feed setup would be nice.  I'm not looking to pressure wash, just want to be able to have some more pressure. (minor update: An ebay search yielded one for sale, looks like I'm no pioneer here) I should have wrote the others down, I recall having a few more ideas. Any input from a knowledgeable person on the topic would be appreciated. And for those that may argue that buying these devices and using standard batteries (AA, AAA, C, D, etc) would be a cheaper investment.  You're right! (IF you didn't already have a bunch of tool batteries, which is my point) Regards

Posted by JustLuckey 4 years ago


100 volt ac motor

I have a Sony 100 volt AC motor and would like to use it with 120 volts.  Can anyone give me some advise? The motor came out of a Sony tape recorder.

Posted by ecafighter 4 years ago


18Volt 25watt AC to DC power supply.

I have a 18 volt 25 watt power supply I would like to sell. It converts AC to DC and comes with the power cord. I was going to use it to make an adjustable power supply but ended up getting something I liked better. I'm asking for 10 bucks shipped anywhere in the USA. Paypal is what I would like to use for payment. Thanks for looking. Edit: On the board for the psu it says 18 volt but with my volt meter and no load it is showing 19.24.

Posted by r1dd1ck913 5 years ago


Gameboy Volt / Speed ?

Hi, I am working on a little project with my olde Gameboy Color ! I am taking it out of its case, and building a wooden / bronze one in SteamPunk Style. Now to get even Nerdier i am considering to build a "Stirling engine" and power the little machine with a Dynamo attached to it! However this might turn out, i would like to know if the dynamo generates more than 3V if that would speed the Gameboy up, or simply fry it? I will add a Good Resistor to prevent that btw :p

Posted by Schoening 6 years ago



72 volt motorcycle distance

I saw this and i need more distance than 10 miles but still need the speed to do the speed limit, (60). 30 miles at least. and i saw some of the chargers that charge like your ipod and stuff as you go. i was thinking if i could boost the power one of those puts out that would charge the battery. you'd probably need too big of solar panels to charge those batteries. can you give me a circuit? and what do you think, give me ideas or anything. hit me up. Im listening to: Van Morrison - Domino

Posted by Yerboogieman 10 years ago


18volt dc tile saw

I have an extra DeWalt 18 volt DC saw. I want to know how it would work if I wired it to a 12volt auto battery charger directly. I want to use it to make a slow speed saw, with a diamond saw to cut large pieces of glass. If my ideea works I'll submit it for an instructable project. As you can tell I am electronically chalanged, but I an in theropy for it(electronics for dummies] Thanks for any input jrags

Posted by jrags 10 years ago


Usb fan for a Modem

Hello. I wan to add a fan to my modem(NET FASTER IAD 2) I wan to use the usb that is on the modem(for adding a network printer or a network disk). I used a usb cable but when I measured the voltage at every cable combination the maximum I got was 0.30v between green and red? Why that? computer usb's have 5v.... Any help

Posted by DJman230 6 years ago


Testing a Cheap Multimeter

It's been years since I had an expensive meter. These days, I have meters in the $5 to $20 range. Usually they're accurate enough for my purposes, but what if I want to be really certain? Is there a way without a pricey meter to test em?  Perhaps calibrate the meter by checking v  coming out of a v regultor. Would that be accurate? Perhaps the 7805 regulator which is supposed to output 5v.  y?n? M?

Posted by Toga_Dan 3 years ago


Build PV solar panels from broken solar cells

The sun's energy may be free, but solar panels can be quite expensive.  Still hoping to get off the grid? VIRON has a great Instructable, How to make PV solar panels, teaching how to make your own from broken or surplus solar cells! From the introduction: In essence, this involves ways to connect cells, which may produce more or less than one volt, and not only try to increase power output but also decrease the load, that is, efficiently conserve the energy whether it is meager or significant. For example, even the weakest solar panels can run watches, calculators, radios, charge batteries, and if a computer were specifically designed to, it would be as solar-powerable as a calculator. Check out the Instructable for info on finding and foraging usable solar cells, instructions on preparing different types of broken cells, tips for getting more power out of your panel, and instructions for wiring the whole thing up to power your devices. Inspired? Planning to try piecing your own solar panels?  Already off the grid, and planning something even better?  If you do, be sure to post an Instructable so the rest of us can learn something new. This post has been sponsored by Pepsi. The Pepsi Refresh Project celebrates the people, businesses, and non-profits with ideas that will have a positive effect on our world.

Posted by canida 8 years ago


Why dont wall transformers have holes?

When i was making my homebrew hot wire for foam cutting, i noticed my 17V low amp transformer ((wall-mount) was getting really hot. So I question to my self, why the heck don't these things have holes? Would it be safe to get a project box from radioshack, Cut out the transformer, and if i want install a fan to keep it cool? or does dust wreck it? Also, theres no way to do hotwires and keep the transformers down right.. i mean its basically a short circuit, as why you try to make the wire hot to cut foam...

Posted by Killa-X 10 years ago


5 volts ballast

Can I have the circuit for the 5 volts cfl lamp ballast. Please! Thanks.

Posted by remyjovero 4 years ago


Running 12 volt off 240 volt

Any one have any ideas how i can (as cheaply and easily as possible) run a winch made to be ran off a 12 volt ATV battery off Australian mains(240 volts)?(this winch to be precise)Cheers, Will

Posted by willj89 11 years ago


Looking for Magnets and / or Permenent Magnet Generators 12 Volts for Africa

Hello, I am working with a couple of young men in Togo, West Africa. They sell solar panels, and because batteries are so expensive, it they did one of them bike rim windmills, and generated 12 volts, during the nights, the houses could power up LED lights. Which 12 volt generator would you recommend to buy on Ebay? Please paste a link. What specific magnets are good for the bike rim, please give me the specific link on ebay. I hope someone has done this, and does know how, I can search.. . I watch so many videos it drives me crazy, I want to replicate, and often the buying details are not included. Thanks, Andy Lee Graham Travel Writer for HoboTraveler.com Merry Christmas hoboontheroad   AT yahoo.com

Posted by hobotraveler 1 year ago


Question about converting a 9v Battery Gadget to AA's.

Hi. I have a Boss DS-2 distortion pedal, but my problem is, it drains the 9 volt batteries like a semi-trailer. So I basically wanted to convert it to AA batteries. Technically speaking, I'll need 6 AA's to make 9volts, but 9 volt batteries have a different current don't they, or will that not matter in this application. I'd also like to insert an on/off switch because it drives me crazy that the only way to remove it, is by pulling out the 'input' cord (guitar to pedal). Please respond if you know the answer.

Posted by Noodle93 10 years ago


6vDC Stereo Audio Amplfier

I just acquired a new, unused 6volt rechargeable battery that is rated at 12Ah. I'm looking for a Class D amplifier that'll run off said six volt battery. I've looked around but unfortunately all the amps I've found are either too low power output, or too high of voltage. I'd like to be able to get an amp that can output somewhere between five and fifteen watts stereo. Does anyone know where I could look?

Posted by Knuxz 6 years ago


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

Posted by grantdevine 10 years ago


Exploding 9-volt Batteries?

I have always wondered if 2 9-volt batteries connected pos. to neg. and neg. to pos. will it explode? Look at the picture if you need help understanding what I mean.

Posted by Thelonelysandwitch 9 years ago


electrical/electronic

20 amps transformer of 14-0-14 volts from 220 volts bobbin size? primary gauge,turns? secondary gauge,turns thanks.

Posted by imamfarid 4 years ago


6-Volt Lamp

I have this 6-volt Lamp it's kind like what you would find in one those 6-volt flash lights except that this is like a stand alone lamp and it has two wires that come out of it but only seems to work at 6-volts, so I have a large 6-volt battery and a 7.5 volt output power adapter I was wondering if 7.5 volts would be too much power to use to power the lamp I don't want to blow it up. I don't know if it'll even work at 7.5 volts because I tried a 9-volt battery and it won't power on with it.  The image is the same lamp I have except mine is connected to a base and has two wires that come out the bottom I would like to find another way to power it besides using a large 6-volt Battery.  Any Suggestions.

Posted by Graydant 3 years ago


Volts from an USB cable

I need to know how many volts a usb cable provides from a laptop. I couldnt find any information on google and I know that someone here has to know.

Posted by allstarn07 10 years ago


What's the best way to lower 6 volts to 5 volts?

Hey friends!  I have a question. I want to be able to use 4 AAA batteries (6v) to power an IC. The IC's max voltage is 5.5. Is there any kind of way I can use two resistors as a voltage divider to lower the voltage 1 volt or should I just use a diode(which would lower it by 1.4v)? Thanks!

Posted by HavocRC 4 years ago


Multiple Speaker Building Questions! :D

Hey guys, first post here, so be kind, I suppose. :PI'm building a set of speakers, loosely based off of the super loud, super long lasting speakers instructable (found here https://www.instructables.com/id/super-portable-super-loud-long-lasting-battery-/ ) I wanted to take these, and make them significantly better.First of all, I was going to substitute in car speakers. The upside of that is that I also get bass without having to go out and buy woofers and wire up a crossover. I've been looking around on partsexpress, and it seems like most have an impedence of 4 ohms, and range from 75 to 150 RMS. I'm aware that the general rule of thumb is that you double the RMS for the amplifier. However, I'm not sure about soe of the other parts. Should the speakers be wired in series or parallel? If they're wired in parallel, should I be looking for an amp with 2 ohms of resistance, since it's two speakers at 4 ohms? If not, can speakers be easily wired in series?Next question, batteries. Where in the hell do I get some good LiPo batteries? I know this thing is going to go through electricity like candy, so I want high wattage and high capacity.The wattage brings me to my last question. These speakers are rated for a maximum input of 70 watts or more. I can't get a battery to go anywhere near that capacity. Will the speakers be harmed by a lower wattage supply? Significantly lower, I might add, most probably not more than twelve, even if I array the batteries into my own pack. How will that affect the speakers?Sorry, one last; concerning the rule of thumb in which you should double the voltage of the speakers RMS for your amp, if I can't find an amp that does that exactly, should I have my amp be slightly overpowered, or slightly underpowered?Thanks for all the help on this one :)

Posted by headinmysights 9 years ago


resistors

How many ohm resistor would i need to resist 7 volts to 3.5 volts and 12 volts to 3.5 volts also....

Posted by Yerboogieman 10 years ago


Volt conversion with mobile charger ?

Hi, I have to DC device  a) works with 5.V    (b) 1.5 Volt...  I am using mobile charger as a power supply.  How can i connect them with one mobile charger....as the charger output is 5.V  only.  a) works fine but as the other device require 1.5 Volts . Which type of power  component should i use to supply additional appox. 1.5 Volts ? will any of these can device blast ? Any type of tips n tricks will be very help full. Thanks, Richi

Posted by RichiV 3 years ago


Regulator Help

I am currently building an LED panel, and need some help setting up the regulators. I am using LM1084-ADJ regulators. What I was wondering is if anyone can tell me how to regulate the current, as in the math I need to calculate what resistance value I have to put between the adjustable, and Vout pins. The guy I was using simply stopped replying.

Posted by MaXoR 8 years ago


3-6 volt ac to 12 v dc

Hi, i going to give it a new try, i have a power source of 3-6volt ac , an di want to get 12 volt dc,and i want it to stay 12 volt dc ,if my input is between 2.5 and 6.5 volts.ac

Posted by alex4421 10 years ago


How to Re-route 9 Volt Batterie from Smoke Detector

Hello, We have 14 feet high ceilings and smoke detectors in 4 rooms at that height. Not wanting to crawl up the ladder to switch the 9 Volt batteries, one would think you could simplify this task. Use a 9 volt battery connector to connect to the battery ports in the smoke detectors, a wire each to a central point in the house, such as a hall closet, where each wire ends in a 9 volt battery box. I can find various 9 volt battery connectors to purchase, have umpteen yards of low voltage wire (from sprinkler system installation). What I don't know is, is there a limitation on the length of wire I can have a 9 volt battery on one end, and the smoke detector on the other end? Thank you. Stefan

Posted by StefanGH 4 years ago


tech

In 12 volts 3 ampere battery, how many 12 volts led can i use to light it up(not a strip one)

Posted by xandera 4 years ago


LED tail lights for a 6 volt Car

I have a 1964 Volkswagen beetle, the car still has its 6 volt electrical system, meaning all the lights are very dim. I would like to use multiple LED's in each tail light housing in order to make brighter tail and brake lights. Can this be done without converting the car to 12 volt ?

Posted by Woody4 6 years ago