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.

Topic by Graydant   |  last reply


1.5 volt LED?

well im putting an LED to my coilgun so it would turn on when  the gun was on (lol) and i was thinking about putting it "between" the 1.5v battery and the charging circuit BUT! i found out that the f*cking LED is a 3v, I tried with all of the LEDs I have but I think non of them works with 1.5 volts does the 1.5 volt LED actually exist? (LOL) or, in the case that I do not find any LED like that one, how could I use the 3v one so it could turn on with 1.5v?? maybe the drawing can help... help pls thnks **the circuit has a red led that lights up when the capacitors are charged, this one is just something i thought it would be nice to have to have it and tell you when its on** **ALSO** this is just a part of the entire circuit, its not the complete circuit, right?, the drawing is just to give an idea of the led part

Question by tato312   |  last reply


240 volt timer ?

Hi all I have a 240v fog machine makes fog like a disco I wish to run it on a timer. For an outside dragon smoke display. I can easily time it purely off /on with a basic 24 hour  household socket cheap timer MY PROBLEM The fog machine after getting power needs a press of a button to activate it. I need a circuit / timer  so  that when it gets 240v power can then "press the button "ie activate I bought a hi tech machine to try  but it loses it's memory setting when timed out on  240v. I need something that keeps its timer cycle intact. Maybe an expert out there can help? Happy to modify something etc. Nick Tasmania

Question by tassie2   |  last reply


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.

Topic by ecafighter   |  last reply


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.

Topic by allstarn07   |  last reply


"5 volt limit" circuit? Answered

Is there a circuit that will take a range of voltages and make all of the voltages that are over 5 volts be 5 volts  like so: 3.5 => 3.5  4.2 => 4.2 4.9 => 4.9 5.1 => 5.0 6.3 => 5.0

Question by flybye22   |  last reply


12 volt soildering iron? Answered

I am looking for a cheap dependable way to make a no more than 13.8 volt D/C soildering iron that can be powered by the common cigeratte lighter plug or with clips on to the battery terminals any ideas?

Question by tazmaniac_37752   |  last reply


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

Topic by RichiV   |  last reply


boost volts deflate amps? Answered

I recently came to know about a "mintyboost" from "steveastrouk"( a very helpful and trusted member of instructables).It boosts up volts while bringing down amps very much like a step up transformer.Well I've got 2 AA rechargeable batteries rated 1.2 volts and 1900mAh.So here's my first question-I connect these batteries in parallel and they give out a total of 2.4 volts okay fine....but what about the amps?will they get added up like volts and produce 3800mAh current?The latter part-I need to boost this 2.4 volts to 5 volts by bringing down the amps(any value is fine as long as its above 0.7 Amps).Could you please give me a specificated instruction on how to do this?If to use a "mintyboost"what software should I use to calculate the required values and......... the rest...... Pls don't think I'm lazy.I really want to do this so badly...

Question by Adarsh_tronix   |  last reply


Whats Better Volts or Amps? Answered

I know the two are completely different, just so you guys don't leave any I'm an idiot comments.  I was wondering if anyone knew what makes a better electromagnet for my coil gun.  Should I look for higher amps or just as many volts as I can find

Question by jj.inc   |  last reply


Coil to give 3 volts

I need 2.5 volts from a coil when a 10mm magnet is passed over. What awg of copper wire and how many turns do I need for an air core coil. This is to charge a super capacitor.

Question by edenordinary   |  last reply


4000 watts @ 220 volt?

How can i (step by step) generate 4000 watts and 220volt from a car alternator ?

Question by nicobotha12345   |  last reply


12 volt incubator circuit

I need to build a dc circuit which will maintain a certain temperature using a globe as the heat source for the purpose of making a small incubator.?

Question by gozitano   |  last reply


How to generate 100,000 volts? Answered

For a special project I need to generate 100,000v to turn hydrogen into plasma.  Can anyone tell me how to do that?

Question by Kalrag   |  last reply


too many volts to an LED

I have an LED that is supposed to take about 2.8 to 3.4 volts.  A single 3v coin cell works great.  However, if I use two or three of those batteries, it gets ULTRA bright.  My question is, what harm is this doing?  Risk of burning out the light, causing heat, other bad things???  What exactly would happen over prolonged use?

Topic by aliasjanedoe   |  last reply


How to convert ohms to volts?

I want to make a taser and the circuit i have needs an audio transfomer 1k to 200k but i cant find it coz im in india can anyone please tell me which power transformer am i supposed to use thanks in advance jumper1111(not my real name of course)

Question by jumper1111   |  last reply


48 volt power supply

Hello everyone. i am interested in building a power supply from 0-48 volts and able to push a good amount of amps. any one have a ruff idea on how to beable to adjust the voltage and not limit my current to 2 amps i would like to puch say 15-20 amps. i can build the rectifier i have a 600v i think 30 amp bridge rectifier. just not sure on how to do the adjusting without useing a regulator chip that only pushes a few amps. any help would be greatly appreciated.

Topic by omnacron   |  last reply



Powering a 24 Volt sensor with an arduino? Answered

Hello!   Ok here is the issue. Right now I am designing a rain water collection system by having my down spout drain into a 55 gallon plastic drum. I want to cap the drum to avoid spillage. The problem is what happens when the drum is full and the rain is still coming in. I know there are plenty of mechanical ways to solve this problem but I wanna have fun with an Arduino I have laying around. What I am thinking is run a pipe out of the bottom that has an irrigation valve installed (for anyone who is reading that that isn't aware of what an irrigation valve is, it is and inexpensive solenoid valve that is used for unground sprinkler systems). I figure I will add a water level sensor to the inside of the barrel and then hook the sensor and valve together via my Arduino. From there type a little code and violaa I have an over fill protection device! Here is the problem: An irrigation valve is 24v and the Arduino is 6volts. I know I can get the 24 volts from a power supply down to 6volts via resister, but then how would power the valve? My goal is to NOT have to buy a 12volt 1" solenoid (i didn't want to spend a lot of money on this project). I am not sure if there is a solution to this problem, but being a very green/inexperienced electronics hobbyist figured could hurt to ask. Thanks

Question by Mpc1055   |  last reply


How do you test a dc voltage regulator?

I have a dc volt regulator that reduces the voltage to around 12 volts. How can I tell if it is good or not?

Question by DELETED_afw11   |  last reply


can I activate a 24v relay using my house's power grid(220v)?

I am making an automatic  fish feeder and to activate it ? I'm thinking about using a 24v 1100ohm relay that I have laying around. My question is: can I do it? If not can I just put a resistor on it? It's supposed to be activeted a bout 15 minutes every day.

Question by tgferreira184   |  last reply


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

Topic by ledzep567   |  last reply


convert to watt?

I am thinking of buying a acid battery. Its specification says that it is a 12 volt one and it's AHC@20 is 200. Can anybody calculate the watt output. I am not sure but AHC stands for Ampere hour capacity. Thanks RajibAzam

Question by RajibA   |  last reply


How to Limit Current on a 24V DC Battery Charger? Answered

Due to what I feel is a Bad design on the charger. I'm trying to limit current coming from a 120V AC to 24 Volt Dc Battery Charger.  The Charger Is what is supposed to be a  Plain 10 Amp Only 24 Volt Charger. However when hooked to a dead set of batteries the current skyrockets up to 30-35 Amps and it trips the internal 20 Amp Breaker.  Is there something I can do to regulate the current down to a better amperage ?  Thanks In Advance. 

Question by BrandonF260   |  last reply


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

Topic by real57vetteguy   |  last reply


converting 9 volts to 6 volts? Answered

I have a small r/c tank that is 6 volts  .the problem with it is it is made to take CR123A 3 volt camera batteries  .which run about 5-7 dollars each  .i could by rechargeable ones for 50 but i thought it would be easier and more cost effective to convert it to run on a nine volt rather then four AA or AAA  .not just do to the cost but also because the space limitations i know how to solder and built circuits if i have a schematic provided .so could anyone provide me with a small circuit schematic or is it just in need or putting a resistor in between the terminals?

Question by somebullcrap   |  last reply


15 volt power supply help Answered

I need a 15 volt power supply. is there any other circuit than using a 7815 and two batteries?

Question by metsfan1938   |  last reply


arduino powered by 3.7 volt battery?

Can an Atmega328 chip +oscillator run off of 3.7 volts without a regulator to be used for 7 channel pulse width modulation with mosfets to drive the leds? I'm desiring to power it with an 18650 battery. (which charges to 4.2 volts and drains to 2.75 volts) http://www.dealextreme.com/details.dx/sku.5790 if not, how could i do it?

Question by SpiffyChee   |  last reply


5 Volt Regulator question (7805).

My students are building a shake cell phone charger and I know there's going to be a lot of current (hopefully) and voltage making it's way to the 7805.  I don't want anything to be lost as heat, so does the 5 volt regulator need a heat sink??  Thank you so much!!!

Question by mckywer   |  last reply


Is there an Instructable on the proper use of a volt meter?

Got a volt meter. It came with no instructions and have no idea how to use it.

Question by mainfig   |  last reply


Drop 0.1 - 0.2 volts DC?

I am building a charger for my apple device, which requires exactly 5V (According to the internet) I am using a voltage booster to get from 3.7V to 5V but the booster outputs about 5.1 - 5.2V. I need a way to drop either 0.1V or 0.2V using a resistor or something. anyone know which one to use? Thanks.

Question by Tuckoguy   |  last reply


12 volt relay help please?

I just purchased a set of electric running boards for my truck. i have to make my own wiring harness. the problem i have is, i need to wire a relay to each running board. i need the relay to power the motor down when the door is opened  and is triggered by the door ajar switch which isnt to hard to do. the hard part is to have the relay reverse polarity so that the motor retracts the running boards when the door is shut and  the signal is lost from the ajar switch

Question by Gearslamer   |  last reply


need help with 12 volt relays?

I just purchased a set of running boards off of a 2011 f150. they are electronic and i need to wire them up to a set of relays. what i am trying to do is to make it so that when the door is open it triggers the relay and powers the motors causing the running boards to open up, easy enough. but the problem i am running into is that when the door is closed and the door ajar switch is no longer sending a signal, i need the relay to then reverse the polarity so that the motor will then spin the opposite direction causing the running boards to fold back up. the motors on the running boards do have built in stops so i dont have to worry about leaving power to them. i am also finding out if the door ajar switch on my 2004 chevy silverado uses a positve trigger or a ground trigger. any help i can get would be much appriciated. thanks

Question by Gearslamer   |  last reply


Power supply volt/amp question?

Hi, My power supply is ac 110v to dc14V 700ma and I want to connect in parallel 2 strips of 4 led (350ma - 3.2v each)  Total voltage per strip 12.8v with 350ma each. I would like to power these leds at 2.5v each (total 10v)  and at around 250ma each. I installed a buck converter at the output of the power supply to reduce voltage at 10v. Will the amps also drop as voltage is reduced or will it stay at 350ma on each strip?  If it does not drop, how could I reduce amps to about 250-275ma? Thanks

Topic by Lion_Heart   |  last reply


3 volt signal to trigger 7 volt? Answered

Ok,so I get a 3 volt signal from a detector and use this 3 volt to trigger an alarm which atleast need a decent 7 volts to function.The detector could take a max. of 5 volts input which I got from the 7 volts DC supply.This 5 volts fed,gets transformed into 3 volts after the detection.So let me make this clear,I have a 3 volt and a 7 volt supply.I need to use this 3 volt to trigger the 7 volt circuit.I know what you are thinking-a relay !right?but I couldn't get  a 3 volt relay anywhere(though I got a 5 volt relay).I can tackle this situation in two ways.1)Either by stepping this 3 volt to 5 volts and making the relay do the job.but how? 2)Or some circuit to use this 3 volt to trigger the 7 volts(like a relay but maybe by using ic's).This is the final part of my project and so please help me.

Question by Adarsh_tronix   |  last reply



How do I connect a PVD-150-31RS (www.allelectronics.com) I can not find schematic anywhere?

I want to use this to regulate my variable volt ( 150+ volts DC) pedal power unit. This Martek power Inc. regulator is perfect and cheap. I don't want to do it by gut feelings, destroy it or even harm myself. I have build several 12 volt regulators but current supply ( 12+ Amps, expensive to build) is my mean concern.

Question by bigplate121 


Dewalt Radio running on batteries of different voltage, would you see a change in performance? Answered

I want to buy the Dewalt Radio (DC011) which can run on many different size Dewalt batteries. My question is will the radio be louder, run longer, or experience no change in performance if it runs on an 18-volt battery opposed to a 12-volt battery?

Question by    |  last reply


how to calculate battery current ?

i want to make a ps2 battery, but it is must be up to 5.65 A

Question by Rendydevara   |  last reply


how much backup can be obtained from 18650 (2600mah) battery and 5w led bulb as a load?

Hello; i have some basic questions and want to clear my mind. i want to create a portable power bank using 2*18650 (2600mah) rechargeable battery and 5w usb plugged led bulb (5v). So keeping in mind the above values how can i determine the maximum backup this setup can provide? i would highly appreciate if you provide some real life examples to calculate the above mentioned values.

Question by askfriends   |  last reply


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.

Topic by spodppl   |  last reply


How to measure verry smal current (amperes) with multi meter?

Hi I'm trying to measure how much current can be generated from tomatoes. Please have a look at http://maaikedevos.blogspot.com and my question will make a lot more sence. What option should i use ( 200u, 2000u, 20m, 200m) if i use 20 on the voltage and i want to use the formula W=VxA ? It seems to me that the measuring in itselfs alters the numbers. The brightness of the LED changes. What is happening here ? How can i measure amperes ? On the picture: 1/ LED hooked up to a battery. Multimeter placed in series to measure the current. (the LED seems to light up but this is reflection) 2/ I turn the multimeter to 200m, the LED lights up very brightly. On the display: 03,8 3/ Multimeter is turned to 20m, the LED lights up. On the display: 3,29 4/ Multimeter is turned to 2000u, the LED lights up. On the display: 1197 5/ Multimeter is turned to 200u, the LED lights up but not verry strong. On the display 1  . Thanks to any one who can explain this to me in clear language. This are my first staps in elctricity-land. greetings, Maaike

Question by dr zeezucht   |  last reply


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?

Topic by cvxdes   |  last reply


When a load is rated at 12 volts and hooked up to a 12 volt battery, does it consume all 12 volts?

This may seem like a very dumb question but I took electronics two years ago as a high schooler and cannot seem to remember much about it. So I have a circuit that has a bilge pump hooked up in series with a 12 volt battery. The bilge pump says 12 volts, I know that that means it must have a 12 volt supply, but if I hooked it up with a 12 volt battery, would there be any left over volts to say, power a small light? Here are links to the battery and bilge pump I purchased from Amazon: http://www.amazon.com/Rule-25S-Automatic-500-GPH-12-Volt/dp/B000O8B7R8/ref=sr_1_1?ie=UTF8&qid;=1426121717&sr;=8-1&keywords;=rule+25s+marine+rule+500+automatic+marine+bilge+pump+500-gph+12-volt http://www.amazon.com/ExpertPower-EXP1270-Black-Rechargeable-Battery/dp/B003S1RQ2S/ref=sr_1_2?ie=UTF8&qid;=1426121874&sr;=8-2&keywords;=12+volt+battery All responses are greatly appreciated!

Question by cobrien2115   |  last reply


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.

Topic by Jordo   |  last reply


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

Topic by jaykup   |  last reply


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

Topic by pbpenguin5   |  last reply


How to calculate resistance?

Ok, I need to figure out how to know what resistor to use. I know how to read a reistor, I just dont know how to use one. Say I hook an LED, a 9 volt battery, and a resistor in a circuit. I want to get the voltage down to 3 volts. How would I go about calculating a resistor reading? What ohm resistor would I use? How do I know?

Question by Adum24   |  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 ) https://www.instructables.com/id/Hot-Plate/?ALLSTEPS 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 : ftp://download.intel.com/support/processors/celeron/sb/29074802.pdf If anybody can help me =D

Question by draknars   |  last reply