AC or DC? Answered

Is there a way to tell if something i AC or DC power if you dont know, my multimeter will read ac on the dc setting and vice versa.

Question by Jimmy Proton 8 years ago  |  last reply 8 years ago


ac motor?

 i have an 3 phase motor with high and low voltage 3/4 hp 3450 rpm, voltage being 208,220,440  first time learning about wind power.Would i be able to use this for wind power generator

Question by time out 9 years ago  |  last reply 9 years ago


Homebuilt AC

Hello again everybody, bwpatton1 here with another one of his strange Ideas..... not as dangerous this time. Well, we built a gameroom, and currently it has a 10000 BTU window unit, in the South Texas summer it has a hard time keeping up, it also uses 900watts, well 900watts by itself isnt bad but we have two of these b/c we have two floors. I was wondering if i could build an AC to help supplement the run times of these AC's. My idea was to get an old refrigerator (and keep it outside) and run copper tubing through the freezer and into the refrigerator area and out of the refrigerator. Then, run this copper tube to a copper coil with a blower fan. Sound good sofar? Then I would run the end of the tubing back to the top of the freezer, somewhere in there there would be an inline pump somewhere............ OH and the lines would be filled with water/antifreeze??? Does anybody think this would be efficient enough to build? Or am I just wasting my/your time Diagram- the thing to the left is the refrigerator, and the squiggles are copper coils, and the thing to the right is a blower/coil. You were supposed to be able to read the writing on the diagram but the camera wouldnt cooperate

Topic by bwpatton1 9 years ago  |  last reply 9 years ago


I'm trying to read ACS publications, what institution should I include?

What institution should I include for my library recommendation? Is it alright to put my old college? http://pubs.acs.org/action/recommendation?seriesCode=nalefd

Question by Vorenus 8 years ago  |  last reply 8 years ago


Can i bypass an AC/DC power supply to AC/AC?

Hi! I recently aquired an used guitar effect pedal, a Behringer X Vamp, to be more exact. It is 2nd hand so it came without the power supply. I know it runs on AC/AC and i have an AC/DC one, so my question is: is there a way to bypass the power supply or the pedal itself so it can run with the supply i have? thanks in advance, stay well

Question by meyers 2 years ago  |  last reply 2 years ago


Use AC voltage to control an AC relay

I have an obsolete device with a bad controller (all potted with plastic, of course), where instead of delivering 120VAC to the motor, it gives only 55VAC.For a workaround, I was wondering if I could somehow plug a relay in place of the motor, and then use it to switch 120 right from the wall to the motor.Most relays I've seen are like 5-12VDC, so would I have to get some kind of transformer, or is there a cleaner approach?

Question by PS118 6 months ago


ac too dc

Is there a way to convert dc too ac power?

Topic by minecraftpotato 5 years ago  |  last reply 5 years ago


ac alternator mentinace?

Plz tell me how work ac altenator and how to check the avr and rectifire bridge and diod kit

Question by baigoo 9 years ago  |  last reply 9 years ago


Low voltage AC?

How can I make a simple circuit that will produce alternating current using 1.5 to 9v power supply? This is an experiment for using an AC voltmeter - that is, making the needle move.

Question by brandegor 9 years ago  |  last reply 9 years ago


AC to DC Converter

Anyone know how to convert an AC to DC without using the Neutral Cable. Just a Single Live wire. Is there a way to split the incomeing Live wire to positive and negative phase and convert to DC from there? ANyone have any ideas?

Topic by Paradigm812 9 years ago  |  last reply 9 years ago


Gearbox for AC motor

Hello I was wondering what type of gearbox is used in an AC motor powered treadmill?  Also do you need more to regulate the speed?

Topic by henry88 7 years ago


Ac invertor for car?

Anyone know how to build a ac power inverter that plugs into a cigarette lighter in a car so you can use it to run laptops,dvd players,etc?

Question by darkangel1966 9 years ago  |  last reply 9 years ago


LED AC Driver

Hello, I was looking at making some indoor lighting using these leds http://www.ledsupply.com/creexml-ww220.php  Of course, the only part I'm confused on is what kind of driver or circuit should I use, if I wanted to plug it into a 110v plug? Thanks

Topic by opliko 7 years ago  |  last reply 7 years ago


motors , and AC supply ! Answered

 hi  , my question is what  would happen if i connected a simple motor ( 3v ) to an AC power supply of the same volt ? will the motor keep turning in both directions right and left .. and so on ? if yes , how can i convert a 3v DC to AC ? and how to control the speed ? coz i need an idea to make a power circuit that can make a simple motor do so (turn right and left and right and left and so on ..... in a controllable speed ) , can you help me?

Question by lu2a 9 years ago  |  last reply 9 years ago


Converting AC to DC

I have a single phase 3.5 hp AC motor, I would like to convert to a 12 volt DC.I'm no electrical expert but I think it can be done.From watching youtube vids and asking Mr. GoogleI understand a DC motor runs slower say 1750 rpm,where my AC motor spins at 3,450 rpm.I also understand a DC motor has brushes.Besides the speed being different, and changing the cord out,is there any reason WHY this couldn't be done?Any potential drawbacks?Any help or knowledgeable advice would be much appreciated.Thanks guys,skip

Question by xhdskip 1 year ago  |  last reply 1 year ago


DC To AC Converter?

Hello, It Is Now Summer where I live, and it is getting VERY hot. I Want to put in an Air Conditioner, but whenever I do, My electric bill goes through the roof! I have an old car part (Cannot remember what it is called, its the part that uses the turning engine to charge the battery or something like that... I Cant remember) and I would like to use that (made into a mini wind turbine) to charge my spare car battery, and use a DC to AC Power Converter to power the air conditioner... I Have an DC - AC converter, but its not powerful enough... I Need To Build One That Can Power The Air conditioner.... Soon... Its Starting To Get REALLY hot... Thanks...

Question by Tuckoguy 4 years ago  |  last reply 4 years ago


connections AC motor ? Answered

  Dear  All... I have an Ac motor FASCO  no. 7160-0276   3wire:  Back ( com.) Red (start) white(run)  But unfortunate can not find this model on internet, So Could you help me to connection this motor with schema if must used with capacitor please tell me how value (mf)of  the capacitor Please.Thank you very much for your time.

Question by lam.huuminh.3 4 years ago  |  last reply 4 years ago


Removing a vehicles AC? Answered

I am stripping down a 2004 ford explorer to put under my 1948 ford f-1.  I have the body ready to come off except for one problem.  The heater/AC.  Those hoses are the only thing keeping me from removing the body.  Is there any way to remove the freon and dispose of it because I know it is illegal to discharge it into the air.

Question by jj.inc 7 years ago  |  last reply 7 years ago


Inductive coupling with/and AC? Answered

Several things I wanted to know, but couldn't find; If 2 AC outputs are of the same amplitude, but of different frequency, will one necessarily be higher in power? In a conventional transformer, (not resonant) does a higher frequency allow for higher efficiency coupling? Does this change if the transformer is resonant? Is a 'standard' transformer more efficient than a resonant one at a very close range? (Provided that frequency, power, etc. are all the same?) And lastly, does the resonant frequency of a resonant inductive coupling circuit affect the frequency at which it couples? (did that all make sense?)                                                                                                                                        Thanks

Question by .Unknown. 8 years ago  |  last reply 8 years ago


Window AC in a RV....

Thank you to those who gave me the ideas for plywood on my ceiling and walls.  I am hopefully going to be starting that project in a few weeks.  Work has not allowed me to do anything before now.  My next dilemma is a window unit I have installed.  I have an older model rv and when I purchased it the main ac was inoperable.  I do not care to get it repaired.  I have installed a window ac, but,  can anyone tell me what is the proper way to insulate or proper insulation to use for the inside....Thank you, Thank you in advance :)

Question by sandy-g 7 years ago  |  last reply 7 years ago


AC Voltage Attenuation?

Hello, All- I am making my second version of the "Tube Lamp." Others have managed to wire in these neat-looking old analog meters on theirs, and I thought that would be something I'd like to try. I bought a couple 1-10VAC meters from fairradio.com... The problem is (besides the fact that I am an electronics idiot) that obviously if I try to wire in this particular meter to normal 110 AC, the meter will blow up. Is there a way to attenuate the voltage coming out of the dimmer to "play nice" with the 1-10 VAC meter? I suppose I would need to divide the voltage by a factor of 10. How would I step down the voltage to the meter only, while supplying the bulbs with the proper voltage? Any help would be appreciated!

Topic by 40percentrobot 11 years ago  |  last reply 11 years ago


Homebuilt AC unit???

Hello again everybody, bwpatton1 here with another one of his strange Ideas..... not as dangerous this time. Well, we built a gameroom, and currently it has a 10000 BTU window unit, in the South Texas summer it has a hard time keeping up, it also uses 900watts, well 900watts by itself isnt bad but we have two of these b/c we have two floors. I was wondering if i could build an AC to help supplement the run times of these AC's. My idea was to get an old refrigerator (and keep it outside) and run copper tubing through the freezer and into the refrigerator area and out of the refrigerator. Then, run this copper tube to a copper coil with a blower fan. Sound good sofar? Then I would run the end of the tubing back to the top of the freezer, somewhere in there there would be an inline pump somewhere............ OH and the lines would be filled with water/antifreeze??? Does anybody think this would be efficient enough to build? Or am I just wasting my/your time Diagram- the thing to the left is the refrigerator, and the squiggles are copper coils, and the thing to the right is a blower/coil. You were supposed to be able to read the writing on the diagram but the camera wouldnt cooperate

Topic by bwpatton1 9 years ago  |  last reply 9 years ago


Converting Dc to Ac

Ok this is my first post on this site so forgive me if i sound stupid...i like to tinker with things so just to tell a little about things i have done...completely rebuilt a pc..wired up an adapter for an old xbox to work on pc...the easier things....fixing frayed speaker wire....rebuilt/and upgraded a zune 30gb to zune 60gb the usual stuff...my most proud is overclocking my amd 64x2 4000+ to 2.9Ghz.....everyone said it couldnt be done...........anyways on to my question.......i want to know what all i will need to convert Dc to Ac power for a set of old desktop speakers i found in my closet.......i have an idea of what i want to be able to do.......put them in a backpack and make it portable.....currently i have two old 7.2v 1200mah Rc car batteries that i would like to use to power it.....and i also have a charger for them...it can charge and discharge...its old but works....so now my next step is what else am i going to need to complete this project...i dont know a whole lot about electricity but know enough to follow directions...if someone has already done this or knows how to and could walk me through what i need to do i would greatly appreciate it....

Topic by Celestial_Artisian 10 years ago  |  last reply 10 years ago


Where can you get a AC to AC adapter?

 I need an AC to AC adapter for the LED fridge light project. I however only known and have seen of AC to DC adapters for cell phones etc. Where can I get one? I have found websites that allow you to buy a customized one but only for batches of hundreds.  Specifically, I need 4.5V 500ma. Thanks in advance.

Question by kevincheng88 9 years ago  |  last reply 9 years ago


i want to convert a window ac into a split ac? Answered

Window airconditioners are very chaep(used) but i cant put them on my wall,so i need a solution to convert a window into a split.i.e my window unit works as an out door unit and i have an indoor unit which brings cold air.I have seen it ,so it is possiable

Question by faizanfriend 9 years ago  |  last reply 6 years ago


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 6 years ago  |  last reply 2 years ago


how is ac current generated? Answered

Ok, so I was under the impression that brushless motors were AC motors (and therefore conducted AC current), until recent internet searches proved me wrong. I am curious how AC current is conducted, is it conducted using brushless motors? Or is it a different type of motor that will generate such electricity?

Question by A-Nony-Mus 8 years ago  |  last reply 8 years ago


Creating a portable ac outlet?

My girlfriend wants me to make a portable battery powered ac outlet for a plug in air freshener (why not just plug it into the wall??) I have searched the Internet, but could find the right idea I'm looking for. I have seen ideas of converting a battery powered item to ac, or a big solar panel ac outlet. Is what I'm wanting to do even possible?

Question by Derek3191 6 years ago  |  last reply 6 years ago


How to convert dc to ac? Answered

Hi! Can anybody tell me how to convert dc to ac i actually want to convert 9volts dc to 9 - 7 volts ac cause i need to supply this ac voltage to a step-up transformer so that it will convert it into 200volts the real problem is when i provide 9volts dc to the step-up transformer it only gives out 41volts in output but when i gave it 9volts ac from another transformer it gives out 200volts ac and that's what i need but i need it to be battery powered so i need to convert the 9volts dc supply from the battery to 9 or less volts ac that's all i want to ask how to do it!

Question by ubdussamad 6 years ago  |  last reply 1 year 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.

Topic by ecafighter 4 years ago  |  last reply 4 years ago


Leds To Ac Main 220v ?

Hello i want to build leds that work with ac main 220v i am fond of the leds . i want to glow up one led  with few components with full brightness ? sorry for my english . thanks in advance ?

Topic by malik8801 4 years ago  |  last reply 4 years ago


AC Power Phase Control?

Hello, Can we use AC phase power control Solid State Relay to control the speed of single phase Induction motor, Using PWM as input to the Relay and the output of relay connected to Induction motor, The motor runs at 220v AC,50Hz,55Watt.

Question by KaroonjharN 3 years ago  |  last reply 3 years ago


Ac and dc led drivers?

Can I power an AC LED driver with DC voltage, I understand the driver controls voltage  1watt , the driver was rated 85 - 265 volt ac input but the seller had written 12 volt with grease pen across the printed label. This light works fine

Question by dsr. 6 years ago  |  last reply 6 years ago


Variable AC Power Supply ?

I need for my experimental work , one Variable High Voltage AC power supply with Variable frequency ?Any body can help , it will be highly appreciated. thanks 

Question by fezanali1 7 years ago  |  last reply 7 years ago


Ace ads and Firefox on Macs

As of right now, some of the Ace Hardware ads are misbehaving on Firefox browsers on Macs. They're showing up where they shouldn't and sometimes replacing the whole page. We're working with them to get this fixed ASAP but it is nighttime at Ace HQ so I don't expect a solution until the morning. In the meantime, things are fine in Safari, so if you need your Instructables fix NOW, I suggest using that. No problems are reported on Windows machines. If you are seeing misplaced Ace ads, please comment with your browser & OS versions!

Topic by rachel 10 years ago  |  last reply 10 years ago


Mini AC-DC transformers?

Is there a device, such as a ready-made mini AC-DC transformer I can build directly into a project, so that I can connect it to AC mains... without a wall wart? I was thinking of taking apart a cellphone charger and just building it into my circuit, but it is not really the shape I'd like it to be... it's a lot larger than I would like. Flatter would be good...?

Question by micobanff 8 years ago  |  last reply 8 years ago


AC Motor to Wind turbine? Answered

Ok Yes I know that It has to be DC for it to work as a generator. But I found a fan from Dads greenhouse and its rather larged, used for air circulation. Is there any AC to DC fix? Any rewiring or turning the coil around? Any help or suggestions would be of great help.

Question by CrawdadMan 9 years ago  |  last reply 1 year ago


DC to AC Converter Circuit

Hi, so I have a sound amplifier that is designed to run off of 18-28V AC power, but I want to try and run it off a 24V Battery, can anyone give me a circuit that would achieve this?

Topic by Fozzibehr 4 years ago  |  last reply 4 years ago


Rectifying ac increases voltage?

I have a transformer that outputs 16 volts ac.  I built a 4-diode full wave rectifier and added a 4700uF 35 volt smoothing capacitor.  Now my dc voltage measures 21 volts?  I thought the voltage would drop because it has to pass through diodes.  What explains this voltage increase?

Question by aeronut01 8 years ago  |  last reply 8 years ago


LED bulb with AC 220v. Answered

Can any body help me???? I want to build a LED bulb with 220v AC. But the circuit should be very simple and short. I want to fix it in a dead Energy Saver (CFL). or can i use dead CFL's circuit with LEDS?

Question by raza896 9 years ago  |  last reply 5 years ago


El Wire AC inverter

El wire is cool and all but all the circuits that come with them are so half assed made it isn't funny. I have yet to get a circuit that is up to spec's that even closely adheres to any of the soldering tips and ticks, good soldering joints, anything. crap crap.  i have the components but the board is whack. how do you go about making a AC inverter for Elwire?

Topic by Chingasman 7 years ago  |  last reply 7 years ago


AC Adapter - wrong amperage?

My dvd player's ac adapter died, and while your forum on opening it up to fix it was great, it is not a simple short that can be soldered. This is a basic electronics 101 question. The old adapter put out 9v 2.2 a. I have an adapter that puts out 9v 3.0a that fits. Will I fry the dvd player by trying it out? or will it only take what it needs? Thanks for your advice. JB

Topic by jaybesq 10 years ago  |  last reply 10 years ago


Low AC to DC conversion

Hi, I'm looking for simple way to convert a low AC into a usable DC, of say 4 - 5 volts for charging batteries. I recently saw one discussed online, specced at costing about a quarter, but couldn't find a way to do it, or a way to purchase something like that. Thanks!

Topic by fafnir665 11 years ago  |  last reply 7 years ago


A small AC power source? Answered

I want something to power LEDs from (I want to stop fussing about the polarity), preferably cheap and compact (I've no intention of buying a lab power source to play with it once in a fortnight, and I don't have the money). I thought about mobile phone chargers, laptop chargers and model railway power sources (I own one of these), but they are all DC. Can you think of something? PS Is it true that a motor connected to an AC source would stay still?

Question by gruffalo child 8 years ago  |  last reply 8 years ago


recycling broken AC motors?

I love demolishing things for parts. Often a broken AC motor is left over. Usually it contains a decent amount of copper. But the copper is mostly deeply embedded in iron (a core or a ring around it made out of stacked steel plate). Since it has been put inside the iron there must be a method to take it out. Copper prices are very high. If it can be separated quickly without melting the whole thing down, I would consider doing this myself. How?

Question by BobS 7 years ago  |  last reply 7 years ago


ac motor speed control

My uncle recently gave me a compact, functional ac motor with an axial blower attached to it. its a pretty cool thing, and i am planning on putting it in my mac's plexi case (when its built). i have no clue how to vary the speed. from what i found on wikipedia, an inductance motor cannot have speed control. how do i know if this motor is brushed or inductive?? and if its brushed, how do i vary its speed? help!!??

Topic by tech-king 11 years ago  |  last reply 8 years ago


12V DC to 12V AC? Answered

I have a speaker with an embeded amplifier that uses 12VAC ~ 2.9A and want to connect to a 12VDC in my car, a simple bridge rectifier will do the trick converting the corrent? 

Question by Salazar2 1 year ago  |  last reply 3 months ago


Need help with AC motor

What is a low cost way of vary a 2 pole ac motor? I know a vfd can handle the job, but I am looking for a way under $100. Also can someone help me out with some wiring. If I have a 120 VAC motor plugged into the wall, how would I reduce the voltage enough to run LEDs off the same supply wire? In other words, I only want to have 1 plug and run a motor and LEDs at the same time. Any help would be greatly appreciated.

Topic by cory_tripp 6 years ago  |  last reply 6 years ago


running LED strip on ac

So i started working on a new project with RGB LED strips and I needed a power source, I dug around my box full of wall warts and saw one that said 12v 3000mA and thought ''perfect!''. I never hit the wires with my multimeter, just used a spare chunk of led strip to figure out polarity.. Anyway, plugged a line into my strip and into my LM7805 and blew my voltage regulator, only then did I look at the power supply and notice it was 12v AC! So to my question (sorry for the long winded intro) How are my LEDs working with AC power?? I switched the leads and they turn on with either line attached, so its obviously alternating, but how could these turn on at all?

Topic by emikayee 5 years ago  |  last reply 5 years ago


12V DC to 220V AC

I have an emergency lamp with backup battery power. its lamps have gone out. i want to use it to power a router, medai converter and a mobile charger. i have uploaded the specification of my power supply and things i want to run. please give me a detail way of doing this project and the materials i need, like inverter and other things My lamp gives 12V DC supply. i want to convert it to 220V AC and run those components. how can i run it and how long can i run thanks

Topic by energyworks 4 years ago  |  last reply 4 years ago