convert 5v DC to 3.3v DC?

Hello would somebody help me with this please, I am not much of a "electronic" kind of guy so this is a big problem for me. I lost the power adapter of our office router WRT54GC (linksys) and my boss has his finger cross on me. I only knew of its power which is 3.3volts 2A DC. From my location, it is very unlikely to obtain a replacement or an equivalent adapter. I have salvaged a power supply of and old printer that gives off 5.0V 2A DC but the router would not run with this voltage. I will really appreaciate it if somebody would be able to help with a step by step explaination on how to lower the 5v to 3.3V . Thank you very much.

Posted by gincasty 8 years ago

DC to DC UPS (Help!)

Hi i am trying to build a sort of DC TO DC ups for my modem/router, please look at the image attached for my project plan. I was able to find many charging circuits online but i cant understand what value relay and capacitor should be used. can any one help me with this project. Thanks in advance.

Posted by spooge 7 years ago

dc inductor

Do inductors work with pulsed dc? like would they become more resistive with frequency? Or would they do nothing because it's not ac and the electrons can't "bump" into eachother.

Posted by guyfrom7up 10 years ago

Measuring Current of 24v dc motor

How to measure the max current of 24v dc motor.. please give me step by step guidance. many thanks

Posted by epple 6 years ago

3-6 volt ac to 12 v dc

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

Posted by alex4421 10 years ago

DC power electric controls

I have a great idea and looking for a type of DC electric control that can handle a charging system and power release . IS THIS POSSIBLE !! and can there be a program written that can control the amount of dc power released? of course i want to control multiple incoming power sources and release the energy it creates.   ANY AND ALL IDEAS WELCOMED!

Posted by ramonc123 7 years ago

50 Watt LED Wired To DC/DC Converter

Hello, I want to wire a 50 watt led to run off of 12 volts.                                                                                                                                   here is info on components:                                                                                                                                                                                    50 watt led                                                                                                                                                                                                           forward voltage:30-36 Vdc                                                                                                                                                                                  forward current: 1750-3000mA                                                                                                                                                                                                                            DC/DC converter:                                                                                                                                                                                                  input volts: 12DC                                                                                                                                                                                                      output volts: 48DC                                                                                                                                                                                              output current:3A                                                                                                                                                                                                Can I use resistors to make this work?                                                    

Posted by flatfish 4 years ago

To make a 12 volt and 1.5A dc supply which supply power for 1.5-2 hours

I want to make 12volt 1.5A dc inverter which will supply power for 1.5-2 hours for my router. Please tell me how to make it?

Posted by mahedi_aiub 6 years ago

how do I energize AC Christmas light with DC power?

I have a set of 50 Christmas lights on a circuit.  120V /  0.17amps.  What can I make to power up this string of lights?  I need to make it mobile so an inverter is out of the question. Thanks, Dewdropin

Posted by dewdropin 6 years ago

I need help connecting a small wheel to a DC motor, yesh.

Hey all, I'm making a little DC generator for my bike (just to power an LED for now), but I cannot seem to connect a wheel to the motor's shaft. It's not too large of a motor, and I had some toy wheels from some little car, but they don't fit and I can't figure out a good solution. Does anyone have a good way to do such a thing? Or maybe even to make an altogether new wheel?

Posted by Jackhole 10 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 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 can charge and discharge...its old but 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....

Posted by Celestial_Artisian 9 years ago

electric car

Ok i want to build an electric hybrid system my first question is ac or dc power. i want to build a paralleled drive system. that uses the stock motor to drive on the highway with maybe a little help from the electric motors. here are my thoughts start with a f250 powerstroke diesel crew cab truck, install a divorced t case and new drive shaft, hook the electric motor to the t case front axle output. the goal is to use the space by the tool boxes to fit the batteries and later update the alternator. the goal here is a hybrid that can still haul what a normal truck can but run purely on electricity when in town

Posted by dkeller8 5 years ago

DIY 4-component Buck converter, no ICs, need help with maths

I'm building a bike light around a Seoul P4 LED and some re-purposed 18650 li-ion cells from a laptop battery. I'll need 700mA constant current and can comfortably fit 8 cells in my enclosure. I've done some reading and I should be able to build a Buck converter relatively easily, but I'm struggling to find any good guides to help me spec the components. I asked on Dave Jones's EEVBlog forums and all the replies recommended either Linear Regulators (wasteful) or something designed using Webbench, which only helps with circuits featuring ICs. As a buck should in theory only need a transistor, a diode, an incuctor and a capacitor I want to build it myself out of through-hole components. Can anyone help with some guides or tutorials on specifying these components please? My degree was Computer Science and I was definitely better at set theory and boolean algebra than anything involving formulae!

Posted by ederfel 6 years ago

ac too dc

Is there a way to convert dc too ac power?

Posted by minecraftpotato 4 years ago

DC to DC converter

Hi ppl, for electronics A level coursework i am hoping to build a DC to Dc converter to use to power high power leds. As far as i understand it will convert DC to AC, use PWM to alter the current out, and then convert this back to DC giving a constant current out. These are available in devices (known as buckpucks) but for my coursework i hope to build a similar thing on Breadboard. This is really a question for the engineers and if they could give me some advice on anything to do with this it would be great! Thanks ppl

Posted by drummer ian 10 years ago

How To Control the Speed of a BIG DC Motor

How would one control the speed of a BIG DC motor used as an engine for a go kart?

Posted by OzoneLab 6 years ago

Instructions for contrlling DC motor from computer

Can anyone instruct me how to control small DC motor from computer.I need circuit diagram + program source code.

Posted by Talha Khosa 6 years ago

volatage booster

Hi every one . i need to know if its possible to boost DC voltage from 0.1V source to 3.8V DC output and how to do it  thx for answer :)

Posted by insurgent 2 years ago

Best DC Motor Starter Circuit I ever Saw

I wish I had drawn this very good DC Motor Starter control. There are enough questions about a starter box, this is one. It has everything you need to wind up a big machine. A

Posted by iceng 6 years ago

cheap wireless button to control dc motor

I'm looking for an easy, cheap way to remotely turn a dc motor on/off with a wireless button. preferably the motor would be on while the button is held down and off when it isn't. anyone have any ideas? thanks! mrPalomar

Posted by mrPalomar 9 years ago

DC motor regulation

I am planning to build a small gearbox that depends on a steady rpm from a 3V dc motor. I understand that the output rpms will change in correlation to the fluctuation of input power. My question is, if I used a regulator to regulate the input voltage from 5V to 3V, will that keep the motor rpms steady?

Posted by Tman179 10 months ago

120v AC DC USB Charger

Hello, Can anyone help me with the steps and components of a USB charger?  I am trying to understand how 120V AC is converted to DC for a USB charger.  I have researched this thoroughly but the more research I do the more confused I become. Thank you all!

Posted by webbkevinm 2 years ago

what dc character prop should i make?

I need help with inspiration for my next DC character prop.  I have already made baterangs, wing dings, and nightwing's escrima sticks (still working on the ibles).  Im looking for maybe a prop from a villain.  i need some help with inspiration... please help.

Posted by anoos5 2 years ago

DC motors & stepper motors

I have 13 stepper motors and 10 dc motors for sell. I just have way too many laying around. I would like to sell them all for 40 dollars shipped using paypal. I'm hopping to sell them to help fund my CNC project. I also might be adding more motor as I find them.

Posted by r1dd1ck913 6 years ago


I'am making a car that should carry 50 kg and move at a speed of 10 km/hr. Can anyone help me in choosing the right DC motor??

Posted by Masked_r 1 year ago

Increasing DC voltage

I need to increase the voltage of a battery from ~30v to ~230v, the only way i can think of doing this is somehow pulsing the DC rapidly to create a sort of "pseudo AC" then using a standard transformer to increase the voltage, followed by the standard rectification process. My problem is how to pulse the DC (bearing in mind the pulse will probably need to be in the order of kHz, and the device being powered at 230v has a power rating of 400W) and how to after the rectification process implement a pwm system. In addition, the method of increasing the voltage strikes me as extremely inefficient, so if anyone has any other ideas I would be very great full. Thank you for any help you can provide.

Posted by csharpdeveloper 9 years ago

How to Power an AC device using DC- from an outlet

I have a heating pad (Sunbeam, the kind of pad used for muscle aches etc.) that plugs into the wall (110v AC). It says on the pad that it draws 42watts. For various reasons, I'd like to have the heat generated by a DC source rather than AC.I'm thinking maybe there is a way for me to plug some kind of converter into the wall (AC to DC) and then plug the heating pad into this which will still result in heat. I have no idea if this is possible. The pad has a switch for three different heat settings.Can I do this? How?Thanks for any suggestions!

Posted by UpsidedownRightSideup 10 years ago

DC treadmill motors 1.5-3 hp great for hobby, windmill, small EV's

I'm a fitness repair technician, i get some really good motors from time to time. Usually posted to ebay under seller name guaranteed_goods....i have 2 or 3 up at the time of this posting... feel free to msg me with what you are looking for....

Posted by mickeyaaaa 3 years ago

Large DC motor

I'm looking for a relatively cheap motor that would be large enough to spin around a nerf Vulcan. I don't know much about what kinds of motors would be good, or where I could get them. From what I've found, they're not that common and they're super expensive. Does anyone know where I could get one for under 100 dollars? It doesn't need to be fast. Thank you in advance for your help.

Posted by alecnotalex 5 years ago


RELATED TO DC MOTOR CONTROLLER (EV VEHICLES) 1: Need for large number of capacitors in the power circuit (store the charge and dissipate to which part of the component mosfet or diodes ??) ? 2: what are diodes parallel to the mosfets for ? ( other than preventing the back emf coming from the motor ) and is it have anything to do with firing angle ? 3:advantage of using many mosfets in parallel than using a single mosfet and on what basis must that mosfet chosen? I am from India a college student pursuing my electronics engineering and making motor controller,i am able to get all the circuit details and how the motor controller works but i have above few doubts

Posted by doraditya 4 years ago

DC motors as generators in parallel?

Hey guys, im doin a project, ill be using two cordless drill motors with a maximum output of 12v each and unknown amp atm. My question is this: Both the outputs of those two motors will equal 24 volts, but I want 12 volts and increased amperage - this will, for the most part, be used to charge a 12 volt lead acid battery and I dont require the safety police on this one. So, can I take both outputs of the dc motors and wire them in parallel and have a resultant potental 12v maximum? Or will I have to use electrickery?? I have only a novice/intermediate skill in electronics and my parts come from re-using old scrap technology. tx, Sky

Posted by Sky Graham 5 years ago

Variable DC input to a clean AC out put

So here is what I am trying to accomplish. I am trying to take an old Jacobs wind turbine controller that was designed for a grid tie application and make it off grid. There is a 3 phase "wild" ac input from the turbine that is rectifyed but not clipped by the internal SCR's to variable DC (40-180 volts). The sensing was designed to tie to the grid and power sync'd to line power and freq then exported or imported depending on demand. What I would like to do is build a Variable Dc input inverter that will put out a pure sine wave 120/240 vac split phase. Thus imprinting a usable power out put and allowing the cap/choke inverter to do its part. The design need not handle much power as it is only used as an imprint to regulate the power through the controller. If anyone had any idea on a build for this or a manufacturer that is producing such an item I could really use some ideas. Thanks

Posted by nbrooks 7 years ago

Customize product that uses 4 - 6 watts 120V AC to run on DC

I have surfed this site for a LONG time now and have never posted a question so this is my first...!!! I have a product that I am trying to customize a little but i need some help.,.. The product uses 4 - 6 watts at 120V AC and it plugs into a regular polarized plug... I am trying to make it run on 12V DC but I really don't understand how to do this or the conversions involved.... I have build a 12V 1A circuit but how can i safely make this product use this circuit...??? If it can run on DC power how many Amps will it use...??? Thanks for any replies and I am really looking forward to making this work if at all possible...!!!

Posted by SummitSeeker 6 years ago

Sodium grow light ballast to car dc-ac inverter. Can it be done ?

Story be this my friend. I have a few 1000watt grow light inverter/ballasts. Turns out i can't afford the electricity needed to run these. Soooooo I'm wondering if i can convert them into a dc-ac inverter. For use in a mobile home or in my car for....something I'll figure some use for it. Could also just be a fun project. Point being Id like to see these re purposed for something useful. I didn't pay much for them (lucky thrift shop find) And i dont want to use it for running lights on 12v or whatever. Thats all i can seem to find on this subject in google. And i can solder and very well..i think. 

Posted by williamb349 1 year ago

Need advice to find 12V dc/ac schematics

Hi, Im looking for schematics for a Chicago electric - 2000 Watt / 4000 Watt Peak Power inverter part number 95596 from harbor frieght. i did search there site with no luck, and i could use it asap. Or if you some advice about how I should go about repairing it, that would be great. It simply will not power on. TY in advance for your help :)

Posted by intheshed123 7 years ago

DC to AC Inverting for boat

This spring I am looking to build a pontoon boat from scratch (Besides the pontoon logs). Its going to be a large boat and I am wanting a few amenities to go along with it. Im trying to figure away convert the car battery wich is on the boat to power appliances such as mini-fridge, lights, radio, box fan, and maybe a PS2 with Television. I need a high wattage out-put to power everything too. For sure: 8 lights - 75 Watts ea. 20 inch tall Mini-fridge - 200 watts Stereo - 150 watts Box Fan - 120 Watts Maybes: PS2 - 180 watts 20" Television - 300 watts I want this to work if all the for sures were going at once. I want to know how many car batteries I will need approx for 10 hours (or longer) of use with the "For Sures" And I want a clean way of doing this. Any advice would be much appreciated!

Posted by d_child 10 years ago

Get rid of batteries on the Fisher-price swing to DC input

We bought a new swing recently and has been consuming 4 C batteries every week. I am wondering if can hook it up to Wall transformer. Any ideas? I have some wall-wart at home that output 6-9v. Can I use them? I can convert the wall-warts as per the instructions here: but do i need to change anything in the swing? and how to hook it up?Please advice ..Thanks

Posted by sulakhe 9 years ago

multi voltage project for sons project

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

Posted by chrisunderwood 3 years ago

Convert DC Light bar to AC

I'm trying to help out a friend. He's an animation student and he frequently has to use a light box while he's sketching. For those unfamiliar, he draws on a paper, and then puts another paper on top and traces it again, but with a slight change from the first. This process continues over and over until the animation is complete. In order to be able to trace, he's got a piece of white plexi (with a 90° bend in it) as his "table". He then places an off the shelf Energizer "Under Cabinet Light" under the plexi. This light has a fluorescent bulb and is powered by 8 AA batteries. Simple calculations means it's running on a 12V battery pack. Since he's often doing homework for 6 hours straight, the 8AA batteries become costly and the light dims over time. He was asking if I could hack the light to take AC power instead. I have an old wallward ac adapter that has these specs: Input: 120VAC 60Hz 30W Output: 12V @ 1.2A. I also took pictures of the circuit board I found inside the light. While I can't distinguish exactly what's on the board, I can pick out a capacitor, a transformer and some sort of regulator. I should've  got a quick schematic... from the looks my google searching, it's a simple fluorescent lamp circuit. Would it be as simple as stripping the ends of the AC adapter and soldering it to the positive and negative contacts on the light bar's circuit board? The adapter itself takes AC and makes it DC so it should work right? Another thing he is thinking of is having me swap out the tube for LED's. I'll just need an LED driver and I can use the same power supply I found in my junk box... it's just a question if the high powered LEDs would be bright enough. Surely if the tube is bright enough on fresh AA batteries, 3 high powered white LEDs would be brighter right? Also he's on a budget, so the AC/DC hack would essentially free for him!

Posted by mrsayao 7 years ago

coverting 24volt rechargeable lawn mower to use direct AC wired connection.

I am not able to start a gas mower and so I utilize a very old electric mower. A friend gave me a black n decker rechargeable 24 volt lawn mower, no "key" and no charger.  I was pondering putting an AC/DC power converter on the mower body and then using an extension cord to power mower. But concerned about running motor direct from converter. I would of course by pass the battery pack and go direct to motor because there are always warnings about not running an appliance while charging. So thinking along these line took cover off motor body and off the wiring in the handle.  Upon inspection except for the wires going to the batteries from the motor, the motor itself looks like the electric motor in my old direct electric lawn mower! My question is: Would it be possible to directly wire AC power to the motor of this DC powered motor? I am not an electrician but understand some basic principles. After reviewing specs on B & D's webs site know that there is some type of inverter built into the battery pack. I'm assuming it is to convert AC to DC for charging them. Could I wire directly to it then to motor and not use the batteries? I survive on a very low fixed income and can not afford to buy a replacement charger and needed "key" (connects wires to make it run). I do have wire and soldier and a desire to make it work. Any advise would truly be welcomed.  Otherwise I will proceed with my inkling of an idea and tell you how it goes or not! thank you.

Posted by nitajayne 5 years ago

about Combining solar power with Grid to reduce utility meter reading

Hello Friends, I want solution for utility metre reading. I have solar panel on my home and it charges battery. And all home appliances are works with AC power. I do want to combine energy from Solar battery and energy from company(grid) so that it will reduce energy from grid and alose reduce meter reading.

Posted by ysr1991 4 years ago

wall wart/transformer instead of batteries?

I have recently purchased a creative HQ-2300D and it only accepts two AA batteries for powering the decoder, there is no DC in on it. Can I use a wall adapter to power it? (it really eats batteries)The intended charger, output is 3.7v = / 355mAhThe reason I am wanting to use a transformer with it, is it would make it a lot easier as it is only used for gaming on the xbox 360 (to get the dolby headphone from the decoder) so it is never used "on the go" so changing the batteries/ recharging them is a mild annoyance I wouldn't have from a transformer turned on when I use the 360. It can't be as simple as wiring pos to pos and neg to neg on the battery terminals inside the decoder with the nokia charger because there is only a slight variation in the voltage.....can it?. I am also concerned about whether the transformer is regulated or not, reversing polarity, correct polarity etc. etc. and what else is important not important when attempting to do such a thing, so as not to destroy my decoder. (I did this before with a minidisc player and a Universal adapter on the wrong voltage, I didn't impress myself..........doh.... anyone smell that....)I tried plugging the nokia charger into another 3v device (an old sony tape deck) that has a 3v DC in, and it didn't seem to give it enough power to turn the tape, but when I plugged in a universal adapter and set it to 3v it worked fine.My idea is to remove the fem connector from the phone and rig it so it can be plugged into one of the battery terminals and the nokia tranny can be plugged into it, but it can still be removed for when I want to use batteries.I put it to all those with the knowledge who can explain in lay-mans terms and educate me on the best, safest, cleanest way to solve my dilemma.Thanks.

Posted by py3m4n 10 years ago

12VDC to 6VDC converter

Hello all, I'm new to the forum but I love the site and have been inspired by it for a while now. So, I'm working on a project to do GMRS radio communications between my wife and I between our motorcycles. The radio and headset part are pretty well taken care of but the radios don't natively accept vehicle power - only batteries. This is a bit of a bummer if you're on the road for a couple of days or more so I want to tie them into the existing 12 volt power on the bike. The radios have no plug for this but I'm assuming if I can knock the bike power down to the 6 volts normally delivered by the 4-AA batteries, I should be able to tie that in to the terminals in the radio that normally take the battery power. So, what is my best option? Hack a cellphone charger? Build from scratch? Size is a factor as it will be stored in the tiny glovebox in the tail of the bike. Any thoughts or links to appropriate stuff would be helpful! Thanks very much. -Ryan

Posted by compassrose 10 years ago

Universal DC to DC adapter?

Does anyone know where to purchase a universal DC to DC adapter? I'm trying to run a webcam off of a specific amount of electricity from a battery pack. 

Posted by DarrenG 7 years ago

Toshiba p35 toshiba dc power jack

Hi, can anyone tell me how to replace the dc power jack on a Toshiba p35-S6112? Thanks

Posted by Oztac 10 years ago

Basic DC (direct current) theory and practice for newbies

Hey everyone, as you may have guessed - i'm a newbie to DC theory! Backstory: after graduating i said 'forget it' to a proper job and moved to Australia to travel. i bought a converted camper van that has an auxillary battery for (whatever), and it looks like it runs off 12 volt dc! the Question: how does DC power work, for me and all those newbies out there putting along on the other side of the planet! -cheers, adrian

Posted by adritek 10 years ago

DC buzzer/noisemaker that doesn’t use a transistor?

I’ve got some nice homemade field phones I made out of old carbon microphone handsets.  I’ve currently got DC piezo buzzers for ringers (which have transistors in them). I want to them to be able to survive an EMP, so I don’t want to use transistors. Is there anything I can use for a DC buzzer/noisemaker that doesn’t need AC power, or a transistor?   The voltage of the phones is 1.5v - 3v dc    

Posted by instrucables360 2 years ago

12 VDC

AC -> 12v DC, 1000mA Output -> Halogen Lamp = Nothing.DC -> 12v DC, 10 AA Batteries -> Halogen Lamp = Works fine.Yes, the wall adapter works.Why does the Halogen Lamp not accept the current?@ 6v, 5W (0.83 Amps, right? Just under the AC output..)

Posted by NarNar 9 years ago

Converting 12v DC to 5v DC

Greetings, I’m very new in electronics. I would like to connect my analog camera that uses 5v dc to my car battery. So I need your help to make a voltage converter. From what I have understand searching the web, I will be possible and very easy actually. All I would need is an opamp and some resistors?!!! Right? So any diagram or anything that you can help me with will be more than appreciated. Thank you for your time reading this. Best Regards P.S. I hope I’m in the right place writing this topic  

Posted by toqilula 7 years ago