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

Asked by sam301 6 years ago  |  last reply 6 years ago


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?

Asked by somebullcrap 9 years ago  |  last reply 3 years ago


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

Asked by tato312 8 years ago  |  last reply 3 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  |  last reply 10 years ago


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!

Asked by fr3dd4 4 years ago  |  last reply 4 years ago


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.

Asked by stevecinstrfme 4 years ago  |  last reply 1 year ago


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

Asked by lilpepsikraker 9 years ago  |  last reply 9 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  |  last reply 10 years ago


Power Supply

With this circuit, does it matter how many amps the input is rated at? The output is supposed to be 2 amps at 9 volts

Posted by TheLostAmish 10 years ago  |  last reply 10 years ago


how much rpm is needed to generate electricity of 3v?

Asked by vdrit 4 years ago  |  last reply 4 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 5 years ago  |  last reply 5 years ago


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.

Asked by pianoman99a 5 years ago  |  last reply 5 years ago


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!

Asked by evilgenius32 6 years ago  |  last reply 2 years ago


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 

Asked by BenderSanchez 3 years ago  |  last reply 3 years ago


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.

Asked by mates 9 years ago  |  last reply 6 years ago


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?

Asked by codycool55 6 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.         

Posted by biochemtronics 5 years ago  |  last reply 2 years ago


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

Asked by jj.inc 8 years ago  |  last reply 2 years ago


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??

Asked by ismael01 6 years ago  |  last reply 6 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  |  last reply 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  |  last reply 4 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 10 years ago  |  last reply 6 years ago


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?

Asked by Adarsh_tronix 6 years ago  |  last reply 2 years ago


"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

Asked by flybye22 8 years ago  |  last reply 6 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 7 years ago  |  last reply 7 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  |  last reply 3 years ago


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.

Posted by EastsidePrep 6 years ago  |  last reply 6 years ago


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.

Asked by edenordinary 4 years ago  |  last reply 4 years ago


What Ohm resistor do i need to turn 9volts into 5volts?

Asked by dilydan 9 years ago  |  last reply 9 years ago


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?

Asked by Kalrag 8 years ago  |  last reply 8 years ago


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.?

Asked by gozitano 8 years ago  |  last reply 7 years ago


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?

Posted by aliasjanedoe 8 years ago  |  last reply 8 years ago


12 Volt Gas Generator

I am looking to building a 12 volt generator from an alternator. I want it to have a car battery (or a deep cycle battery if it's easy to integrate) for quiet operation. I want the output to equal that of a 12V car plug socket so I can easily invert it to 110 volt AC. the engine will need to be small as possible without stalling on high demand. I guess it would have to have the same circuitry of a cars main power circuit. So, can someone give me a few tips on making this? And most importantly, a schematic. I can't seem to find a basic car circuit.

Posted by physics_dude 9 years ago  |  last reply 7 years ago


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.

Asked by Sargebubbles26 5 years ago  |  last reply 5 years ago


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?

Posted by olddawg 10 years ago  |  last reply 10 years ago


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.

Posted by HittingSmoke 8 years ago  |  last reply 7 years ago


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

Asked by britesc 5 years ago  |  last reply 5 years ago


How to build a 12 volt to 1.5, Volt DC/DC Converter

Greetings all.  I suspect this is a pretty remedial question but I've not been able to find help or instructions online...so here I am.  Basically I want to build my own 12V to 1.5V converter to power a small electronic device in may car that is currently chewing through a lot of batteries.  Such converters are cheaply available online but what would the fun of buying one be, if I could make my own instead?!  Can anyone help me get started by pointing me to an online resource with information on how to make such a device? Many thanks

Posted by mcbenney 8 years ago  |  last reply 8 years ago


Bench top power supply with 9 volt and 1.5 volt outputs? Answered

I am buidling a benchtop power supply from an ATX power supply.  I understand using the color codes how to accomplish  12v, 5v, and 3.3v connection connection ports. How could I add 2 more power ports for 9v and 1.5 volt? Basically I am trying to minimize the use of batteries in my testing with most common power sources. I have read a little about the -12v and -5v being obsolete power options.  Is there any need for these voltage outputs for a newbie electronics hobbiest? Thanks, TRU

Asked by DiyWaterDog 2 years ago  |  last reply 2 years ago


How to Boost Voltage from 1.2 (or 2.4) Volt to 12 Volt?

I want to Build a flashlight as small and bright as possible but it doesn't need to last long. I allready got a case i want to use, it has enough space to fit 2 rechargeable AA's and 2 1000mA LED'S + cooling thingy. But to build it I need at least 7-8 Volts (12 woud be better). I only need it for like 10 Minutes between recharging so I don't really care about efficiency. Every schematic and formula will be helpful :) Oh and it would be nice if it's cheap ^^ Thanks from Germany :)

Asked by Yakumo 7 years ago  |  last reply 4 months ago


How can I make a 9 volt shocker?

Okay.I want to build a shocker with a nine volt battery.No soldering iron.I have lots of 9 volt batteries. Note:A 9 volt shock is wanted .Not 300 volts. Thanks,bylerfamily

Asked by bylerfamily 9 years ago  |  last reply 8 years ago


I have a small fan that I want to hook up to my usb port...

but it's a 12 volt not a 6 volt, and it runs to slow on 6 volts. what do I do?

Asked by oldanvilyoungsmith 9 years ago  |  last reply 4 years ago


How many Volts come out of a USB plug, i mean the female part not male? Answered

Need to know soon, it's for a project

Asked by cd41 9 years ago  |  last reply 9 years ago


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...

Asked by Adarsh_tronix 6 years ago  |  last reply 6 years ago


What's up with this transformer!

Hey I have a litte problem! (sorta, not yet!) So, I have one of those wall adapter things, and it says it outputs 12vDC and 1 amp. Out of curiosity, i hooked up my volt meter to it and the output was a whoppin 20 volts! Why was it 20 instead of 12 like the transformer said? This is making me worry about my other ones!

Posted by HavocRC 6 years ago  |  last reply 6 years ago


HELP please!! with Li Ion battery

1 st question: i have a 7.4v 2200mA li ion battery. my ip camera takes 5v 2amps what color resistor should i use and how many ohms? 2nd quesiton: i have a class 2 battery charger 12 volts 300mA is it good to charge my 7.4v li ion battery?

Asked by dwstar79 7 years ago  |  last reply 7 years ago


Question dealing with high volt capacitors in series

As we all know (at least most) you can get free cameras at places that recycle disposable cameras. After having my fun hooking then in parallel to attempt coil gun, or just melting holes in water-filled soda cans. But I wanted to try to hook some in series, so instead of 320V, i got 640. I know series adds up so both are fully charged to 320V, but heres my question. 1: Can they ever blow seeing that the output is 640 yet their rated 320? 2: If i discharged between then, can i have a greater chance of them exploding comparing to parallel hooked?

Posted by Killa-X 10 years ago  |  last reply 10 years ago


**HELP** PSP: battery charger **HELP**

Can I charge my psp with 6 volts (aka 4xaa) ? even though its only supposed to have 5v....Or do I have to go to the source ( what used to be radio shack in Canada ) and find a regulator. If so what little digits should be on it ? and would any of the following regulators work ? AN6541 IRL3103 ( I already have them I ripped them of of old mobos) To explain I lost my wall charger and usb charge don't work unless its on..... and the battery is dead

Posted by littlechef37 10 years ago  |  last reply 10 years ago


LED Voltage indicator

I have recently installed a solar panel in my garden to charge a 12volt 21Ah battery. I would like to show it off a bit by using a simple LED display to show it working. What I was thinking was to have a range of about 8V-25V. At the low end would be blue leds (for cold) up to red (hot) at the high end. Does anybody have any idea how I would go about getting something together. I can read circuit diagrams at a push (my Dad's the expert) and would like as much information as possible. Would it be possible to have 1 LED per volt ? Am I being simple? Would this project be self defeating in that it'd use lots of the free power I'm trying to collect? Any help anybody can give I'd be grateful to receive. Share & Enjoy. Zippy.

Posted by bunglesmate 10 years ago  |  last reply 10 years ago