Amps and Volts? Answered

So i have a atx pc power supply and i am going to use a pci cable to draw power from it for a led lighting system and the led light system can only take up to 12 v at 2 a, will that destroy the led light system or will it be fine? (also i cant open up the box that controls the light system to fix the blown fuse)

Question by Austinthemighty   |  last reply


Volts and current ? Answered

I'm confused what's the difference between voltage and current ? also what's the difference if I power a 1.5v motor with 3 1.5 battery's in parallel and same motor in 3 1.5 battery's in series

Question by Robinson ruiz   |  last reply


24 Volt AC volt to 12 volt dc?

Hi guys i have a 24volt ac motor and want to reduce it to 12v dc. I have worked out how to change it to dc but not how to reduce the voltage. Is this easy to do or do i need to purchase something from the electronics store. any advice would be appreciated sam301

Question by sam301   |  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


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


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

Topic by willj89   |  last reply



5 volts ballast

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

Topic by remyjovero   |  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


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


12 volt leds

I work at a custom motorcycle shop and use led lights in our fenders. I'm having trouble finding a constant supplier of 1,2,3, sequenced led lights for run light,turn,and brake. Any one can help that would be awesome!

Topic by cbarr600   |  last reply


16 volts and a LM7805? Answered

I was wondering I'm making a very tiny project with that requires 5v. I'm using these little 3v batteries (CR2016). If I use like 6 of those and a 5v regulator, approximately how fast will they drain? Is that not a good way to lower the voltage? 

Question by HavocRC   |  last reply


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

Topic by Schoening   |  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


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



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


How to increase an output of 5 volts to 9 volts?

I have a fixed input and the output is 5 volts. What type of design must I create to increase my output voltage to 9 volts with the already given output of 5 volts? I am trying to make this charger project as small in size as possible. Any assistance with this would be great. Thank you all!

Question by fr3dd4   |  last reply


120 volt ac to 5 volt dc circuit?

How to build the circuit that is in those devices that plug into 120 volt receptacle and can have a usb charger cable plugged into it. I just need the circuit diagram. I am a little familiar with schematic reading. It all fits in that little plug in device, so it can't be that much, right?. Thanks.

Question by stevecinstrfme   |  last reply


Step up 6 volts to 9 volts? Halp!

I have a GB Instruments dmm i got at a Hamfest (Ham Radio Fest) in Peoria, IL a few years back for like $6. It's great, and its more accurate than my father's Craftsman from Sears that he paid $40 for about a year ago. I have replaced the 9 volt battery twice in it. 9 volt batteries are horrible for capacity, and I use this DMM so much it's almost a high drain on the 9v. I know that a standard 9v holds 500-700mAh. I have a whole box of old AAA batteries that have about 1.4+ volts still in them from a stupid car toy that drained an AAA .1v-.2v and called it dead. A standard AAA alkaline battery (E92 or equivalent) holds 1,200 mAh or 1.2Ah@1.5v. 4 alkaline AAA batteries holds 4,800 mAh@6v. I can fit 4 AAA batteries in the 9 volt holder in my DMM snugly with a piece of foam for anti-rattle. That's only 6 volts. The DMM will power on very dimly at 6v, so is there any circuit to make up for the lost 3 volts without adding a bulky power pack? There is a LOT of room in the DMM for mods n stuff. Thanks for any help Is there any way to step up

Question by lilpepsikraker   |  last reply


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!

Topic by HavocRC   |  last reply


Relationship between volts and amps

I'm working on a project found in this thread https://www.instructables.com/community/Solar-powered-cell-phone-charger-case-hack/ I think I'm almost ready to buy parts and start building but I have a small issue with getting the exact voltage and amperage output I need. I've been researching for hours and I can't find a simple answer to this problem. As I understand it, as voltage decreases, amperage increases to compensate and maintain wattage. Working on this basic understanding I've come up with this model. If I have a solar array consisting of 6 PV cells (1.5V 50mA ea) wired together I get 9V and 300mA. This is too much voltage and is on the low end of amps I want. If my math (and understanding of the subject) is correct, then if I use a 5V voltage regulator I will have a final max output of 5V and 433.3 mA which is right about perfect. Am I doing this right or is there more to it, like how I'm wiring the cells together? Am I correct in the idea that using a voltage regulator will increase my amp output? I'm not schooled in electricity in any way so I would appreciate any help I can get on this in as simple of a form as possible. Everything here I've put together from several hours of studying sites on solar DYI and electricity. Thanks. For reference, these are the solar cells I was referring to: http://cgi.ebay.com/High-Efficiency-Solar-Cell-32-22mm-1-5V-50mA-0-075W-/320541888508?cmd=ViewItem&pt;=LH_DefaultDomain_0&hash;=item4aa1c90ffc#ht_2428wt_1148 *EDIT* Below is a diagram of what I suspect may give me a 5V/490mAh output which would be absolutely perfect. I need to know if I can wire two different sizes of solar cells together in this manner and how it will effect the output.

Topic by HittingSmoke   |  last reply


Too many volts from a bike generator

I took a treadmill motor and hooked it up to an excersize bike in order to charge a 12v battery and power an audio system.  Unfortunately, it worked far better than I ever hoped and is pumping out 75v at a max pedal, 45v on an easy ride.  I've looked into various charge controllers, but they only charge batteries close to the input voltage, and step-down voltage changers take it directly down to 12v, too low to charge a 12v battery.  Any suggestions?  Thanks.

Topic by EastsidePrep   |  last reply


i have a battery just say 1 volt 1000 mAh and charge it with another battery 2 volt 1000 mAh how long will it take? Answered

How many mA go from the battery to the other? how do i calculate this??

Question by ismael01   |  last reply



Battery power

I am attempting to calculate my amp need for my garage in order to set up a 12v battery system. Using the formula; Watts / voltage = amps drawn, I have hit a question. If using a 12v battery system and converting to 110v, should I be using 12v or 110v in the formula?Example; 100 watt light bulb / 110 volts = .91 amps. Nice!But if I use the 12v; 100watt light / 12v = 8.3 amps.I'm believing I would be drawing 8.3 amps from the battery to power this light.Plus the converter draw...Please tell me which is correct?

Topic by olddawg   |  last reply


What is the simplest and most efficent way to convert 3v to 5v?

There are several circuits out there on how to up-vert a 3v input to a 5v input, hwever I would like to know the simplest way.

Question by Sargebubbles26   |  last reply


Tiny circuit to measure amps?

I am going to use a ATTiny43U to obtain the voltage of a 2vdc solar battery, via self powering (0.8-5.5VDC). Using ohms law I know I can obtain the amps as I will have the voltage and a resistor. I want to know what resistor to use? I will feed the amps result back into the ATTiny43U as well as the temperature from another sensor. Can someone please advise me what tiny circuit I can use to get the amps as I do not know what size resistor to use? The operating voltage should be between 1.55 and 2.67 vdc give or take a bit. Thanks and kind regards, jB

Question by britesc   |  last reply


I want to power a 3 volt devise with a 9 volt?

How do you lower the output power of a battery

Question by corsi   |  last reply


How can I raise 1 volt to 5 volts?

I have a TLC module that i can get to produce about 1 volt from my hand.  I would like a way to turn this into 5 or more volts.  Any help would be greatly appreciated.  Thanks in advance.

Question by pianoman99a   |  last reply


How to drop 9 volts to 3 volts at 32 ma

Hello, I am a new B here. I would like to use a 9 volt battery to power lights for my RC car. The led lights operate at 3 volts 32 ma. What size resistor will I need to make the voltage drop. Will this also control the current so I do burn up the lights. The lights are somewhat expensive so would like to get it right the first time. Thanks for anyone's help.papadewey221

Question by papadewey221   |  last reply


Trying to change 120 volt AC to 120 volt DC.

I have the full wave rectifier rated at 400 volts and 8 amps and need to know what kind of capacitor/ voltage regulator I might need to accomplish this. I'm powering two 100 watt lights off this. Thanks!

Question by evilgenius32   |  last reply


How to convert 300 volts DC to 30 volts DC?

Alright so i made a simple full bridge rectifier (http://www.electroboom.com/?p=544) credits to Medhi Sadahagar. I modified it such that it works with 240 volts mains instead of 120 volts mains. my capacitor bank is 2.4 mF and 400 volts. However, the output is 312 volts DC and I require around 12-36 volts DC at minimum 10 amps to power a ZVS driver (by Plasmana). I tried a voltage divider but I think the power rating of my resistors was not enough as one of them heated up and broke. I need help in designing or making a suitable circuit to reduce 312 volts DC to 12-36 volts DC at 10 amps minimum. Please help me and have a great day :D 

Question by BenderSanchez   |  last reply


How do you reduce 6 volts to 4.5 volts? Answered

I am working on a toy truck that will play music, have headlights that will light and a gear system that will lift the truck up and down when a switch is pressed. The music (took from a stuffed keychain pig) and lighted headlights (Blue LED) work using 4.5 volts. My gear system use to use 4.5 volts to lift the truck, but now it won't do it. In order to lift the truck I have to increase the voltage power to 6 volts. If I increase the power of the gear system to 6 volts or more then it will fry my music and lights (however, I can make adjustments to the LEDs with resistors). The higher the volts are for the gear system, the easier it is to lift the truck. Maximum volts for the system are 12 volts. I know lifting the truck puts a strain on the system but the more power I give it; the better it can lift the truck. My goal is to use one power source and one switch. I thought I could use to different power sources (6 v and 4.5 v) and connect it to one switch, but I think it will fry of my music and lights. My question is: How do I reduce 6 volts to 4.5 volts, using 6 volts as my main source and connect everything to one switch? If I can get this figured out then this will help me with future project, where I need to use voltage reduction (or is it called voltage regulator). My knowledge of electronics is very low or enough to get me in trouble, which it has done. I am familiar with a few basic electronic terms and formulas. I will except and appreciate any help, ideas, diagrams, etc. Please use layman terms.

Question by mates   |  last reply


What are the effects of powering a 14 volt system with 12 volts?

I have some older, but nice yamaha computer speakers. there is an external transformer, and it says the out put is 14v dc, 800 mA. I am wanting to skip the transformer, and us a 12 volt sealed led acid battery battery to power them, placing it after the transformer. I would prefer to use the 12v battery as a 12v 5 ah battery is around 25-35 dollars, and a 14.4v 2ah battery is around 70 dollars. Would this do any damage to the amplifier circuit within ? What effects would this have on the sound quality of the speakers? Would I be able to be switch from 12v dc, skipping the transformer, and plugged into the wall using the tranformer if i wired it to be able to do so, and would that have any long term effects on the speaker?

Question by codycool55   |  last reply


Will a 240 Volt AC Motor Operate on 120 Volts AC

I need to know if a 240 volt ac squirrel cage fan motor can be safely run on 120 volts ac. An quick internet search reveals several sources that all say no, but I am concerned that the people answering the question don't know what they are talking about - as is often the case on the internet. I know there are a lot of want-to-be engineers out there ready to answer any question posed even when they have no experience or knowledge of the issue. Please do not guess at this or offer some unsubstantiated opinion.  I need a real answer to this question. Here is what I do know about this issue from researching a couple of electrical engineering sites. Lowering the motor input voltage by 50 % does several things. 1) The motor will run slower. 2) The torque developed will drop to about 25% of its full voltage rating.  3) This decrease in torque can make the motor stall when trying to start under a heavy load. 4) There may be drastic speed fluctuations due to load variations.  5) The motor current will double if the load remains constant. I can understand how these issues could cause severe problems in some applications, but perhaps not in the application I am looking at. I want to use a squirrel cage motor rated at 1/20 HP, 240 volts, 0.5 amp in a direct drive fan application. Here is how I am looking at this issue: - I need to reduce the fan speed so the speed reduction is a good thing in my application. - I have test run the motor on 120 volts for about an hour and there is plenty of torque to operate the fan. I figure at the lower speed there is less air load on the fan blades so less torque is required. Again a good thing for this application. The is no heavy load at start up and the motor seems to have plenty of starting torque for the fan. The fan does not reach full speed as fast as it does on 240 volts, but it still does so in about 4 to 5 seconds so this shouldn't be an issue either. Since it is a fan moving air and not some machine moving gears and levers the load is constant so the speed does not fluctuate at all. Again this should not be a problem. The possibility of the motor current increasing is my only concern so far and apparently it is not an issue since a test run showed the current decreased from 0.5 amps at 240 volts to 0.4 amps at 120 volts.That is a significant current drop instead of the predicted increase. Since this is a fan, I think the current decreases because the load decreases with the lower speed. For these reasons and based on my apparently successful test run I think the motor will operate fine on the decreased voltage. However, I am not sure how to factor the motor slip into this. Slip is the difference between the synchronous and asynchronous speed of an induction motor. From what I have read the slip will increase dramatically when the voltage is cut in half, but I am not sure what physical affect that will have on the motor. If you know what effect that will have or know of some other factor I am not catching please let me know.         

Topic by biochemtronics   |  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


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


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.

Topic by Thelonelysandwitch   |  last reply


3 volt voltage regulators?

Hi,I need a 3 volt voltage regulator,1 ampere(or lower).I tried looking for Lm 7803 but couldn't find it any local shops.Anyother alternatives?

Question by Adarsh_tronix   |  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


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

Topic by newwarhammer2   |  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


About boosting battery volts? Answered

 If i use an XL6009 module to boost up my battery for example from 3.7 to 5 volts how it will effect on the battery my battery will drine much faster ?  will stay the same ? 

Question by NivA2   |  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


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


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