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? 

Asked by Salazar2 1 year ago  |  last reply 21 days ago


18v to 12v

Hey everyone, i need help on downgrading 18 volt battery to 12 volt battery, id like to do it for cheap or even free if thats possible. 

Posted by sirus17 9 years ago  |  last reply 9 years ago


16v to 12v ? Answered

Hi there i want to know how to decrease the voltage from 16 to 12v dc for a lcd monitor i was thinking to use a voltage regulator but i dont know nothing about voltage regulators please help

Asked by Andrew_48 8 years ago  |  last reply 8 years ago


Small 12V batteries

I'm trying to make a simple LED circuit with switch included in the circuit. Can someone suggest to me a 12V battery that is big enough to keep a 48 LED bulb system on for at least 24 running hours, but small enough to be the size of two fingers sticky taped together. Thanks guys, Nick

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


12v battery charger? Answered

My WiFi ISP signals were unable to reach my room. So my ISP arranged a device  on top of apartment & it was powered with 12 volts DC adapter. But makes me to work offline when power is OFF. So i want to make that device to work on 12V battery. So i need to make a charger for that battery to work as UPS. Can any one help me with circuit Diagram and components list??

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


How to Wire 12v LED strips to a 12v supply

Can i wire two 12v led strips to a single 12v power supply? I"m attaching a image, since i'm not very good at explaining my self. Thank you

Asked by JustXtreme 8 years ago  |  last reply 4 years ago


Powering 12v LED strips from a 12v battery?

My situation is this, theres this old farm building i want to do up and make into a chill out room, but the place is not connect the any type of power supply, or if it was im not gonna try and fix it. i just want to get some lights in the place to make it look good, nothing major just a strip of leds running along the floor lighting the walls.  If i bought a simple 12v led strip  and a 12v battery box ( the ones that support AA) how long would that last for? i need it to work for at least 3-5 hours. if this is impossible would a 12v solar panel be better ? something like this  http://www.ebay.co.uk/itm/NEW-12V-SOLAR-PANEL-BATTERY-CHARGER-CAR-CAMPING-CARAVAN-/230995256615?pt=UK_Gadgets&hash;=item35c863e527 i could just connect the croc clicks (or cut them down and solder) them straight onto the led strip ? if both these are bad ideas im open for suggestions also would i be able to have a controllable LED strip to be able to run off these two types of power ?  (and just a random add on question, if i wanted to power some speakers without it connecting to the mains how would i?) Thanks for any help or suggests and reading :) ! 

Asked by iconicbuck 5 years ago  |  last reply 2 years ago


12v LED lamp+ Solar panel+ 12v car battery? Answered

I am new to electricity beyond a basic circuit, so I am at a point of being unsure about my current scheme for a relatively bright light that runs off a battery which recharges via solar power and doesn't go dead due to the continual recharging during the day and effective use of electrical energy. I do not know whether resistors, transistors, power inverters, or any other equipment is beneficial or necessary. I am also unsure of a high quality, relatively cheap solar panel that is compatible with the 12v battery and the 12v LED bulb (if anyone has any advice for that). I drew up a diagram of my possible setups, labeled 1, 2, and 3. Option 1 is the basic setup without any additional hardware. Is one of these setups correct, and the most effective way to go about my objective? If not, how can I modify it to be the proper setup? Thanks :)

Asked by tyranasaurus tyler 7 years ago  |  last reply 4 years ago


12V over ethernet ( CAT5)

Hello, I need to transport 12V of molex output from a computer power supply over 10 meters to feed a touchscreen. My house has CAT5 cabling. Can i use that? Does someone have a step to step procdedure to make this cable ? Any ideas ? Thanx! Henri, Hilversum / The Netherlands

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


Confused: 12V AC to 12V DC, simple bridge rectifier? Answered

I have a 12V AC power block powering some lights, I want to take one channel off that block and power a 12V DC strip of LEDs, could I just use pretty much any single phase bridge rectifier? They all seem to be rated in the 100's of volts... I know I could do the same thing with a bunch of diodes, a zener and a resistor, but I'd like to just use a packaged chip (because I'm lazy...)?

Asked by csavage6 6 years ago  |  last reply 5 years ago


Which type of diode for 12v 10amp to 12v 0 amp?

Hi all, wondering if you can offer any advice, I'm making a circuit that has two sub circuits:- circuit 1 10 amp transformer, connected to lights circuit 2 6 amp transformer, connected to lights Both these sub circuits will be bridged to  a large circuit , however  I believe I need a diode that will stops the 6 amp transformer getting to circuit 1, but the transformer from circuit 1 to power the lights in circuit 2. If this is correct could someone advise that type of diode I would need to drop the amps to 0. I'm not sure how diodes work however I'm using led lighting that will run off 5v so I'm aiming to have as close to a one way valve for power. Also will I have to place a diode on both the positive and negative or will one surface? Thanks for any help you can offer

Asked by C2L 3 years ago  |  last reply 3 years ago


Wiring a 12v remote switch?

Hi all, I have a small 12v forge blower which runs off a golf cart battery, at the moment it just has a toggle switch on the + to turn it on and off. I'm looking to show off at a meet up (for fun I'm not really a show off) and really want to wire it up to one of those car key fob type remote switches. I'm a complete noob when it comes to this type of wiring and would really be grateful if someone explain how to do it properly and what the correct switch to use is. I have looked at a few schematics but I don't know how to follow them properly. Thanks in advance Adam P.s it needs to one press to turn on and stay on and one press to turn off.

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


12v automatic lid opener

I have a dc 12v winch that I want automatically open a lid of a feeder at a specified time, remain open for a spercified time and then reverse the motor to close the lid for a specified time and the procedure will repeat itself  the next day. I have a timer that will work but I want the motor to reverse automatically.Any info appreciated. Thanks

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


will 5v stepper will work on 12v?

In "https://www.instructables.com/id/eWaste-60-3DPrinter/"   the datasheet for pl15s-0120(Stepper of dvd drives) says it operates at 5V , Didn't the a4988 gives 12v out ? , will it gonna work ? (posted comment there but no one replied .....)

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


12v solar to heat water

Im looking to install a hot water cylinder with a 12v immersion heater powered by solar panels(to add wind later) to my hot tub. the idea is to either heat the whole thing all the time or to at least reduce my power usage on the heat side of the running cost. has anyone done anything like this and have any advice? the basic install idea i have is, solar panel/s to a controller controller to a battery controller to immersion heater was also thinking of installing a normally open relay onto the stat of the heater so when it is at temp a fan heater would kick in, but that would be a later install if the water heating would work. any info would be great, if i get enough info i will be doing this and making it into an instructable to further help adopt this to work better. thanks....

Posted by gareth.collier.1985 2 years ago  |  last reply 2 years ago


9V adapter instead of 12V?

Hi,i have a led strip of 12V. but i dont have a adapter of 12V. so i am using a 9V adapter. does this damage the adapter or the led strip ?? thank you

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


L293D with 12V motor issue? Answered

Hi,All Now i wanted to control a 12V motor with a L293D chip.my purpose is to make the motor go forward and reverse with the control of Arduino.I got a wiring from internet.but I think is incomplete wiring.the arduino uses 5v power rail and the motor uses 12v power rail.from the wiring i cannot find the GND with the 12V power.so strange.i want to know how the 12V rail GND wire goes? Shanno.G

Asked by gada888 2 years ago  |  last reply 2 years ago


Solar Panel 12V regulator

Currently i am working on a 12V solar panel. the solar panel will be charging up the battery of 12V7AH. The problem is that by using the solar panel,the voltage often to be fluactuating down until 10V. How can i make the voltage remain constant at 12V?

Posted by haizad86 8 years ago  |  last reply 6 years ago


12v dc motor selection Answered

I have made chassis for my robot which is around 15-20kg.which motor would suitable for it?

Asked by amey123 4 years ago  |  last reply 3 years ago


12v brake and tail lights?

I'm trying to build a brake/tail light out of LED's for my motorcycle. How do I make the red brake lights brighter than my red tail lights? I'm using 3mm 12v (resister pre wired by supplier) and/ or have similar 10mm lights available too.

Asked by dthing 6 years ago  |  last reply 4 years ago


Frequency of 12v halogen transfomer?

Hello everyone.. I would try using a 12v transformer halogen (please see photo) for flyback driver (about 10-30 watts) .But seller sell on Ebay do not know the frequency of 12 vac, so could you help me to know that(frequency of 12 vac out) thank you in advance.

Asked by lam 4 years ago  |  last reply 3 years ago


Controlling a 12v Wiper Motor?

Hi all, I'm a bit of a noob with electronics and wondered if anyone could help me with a project, I would like to control the speed of a wiper motor for use in a small powered saw. Ideally using mostly the upper end of the motors speed, are there any cheapish products I can buy off the shelf to wire together to give me (UK) mains power going in and the max safe voltage/amperage out to run the motor, plus speed control. I say max voltage/amps as I have read elsewhere that the motor can handle a bit more than just 12v. I have searched a good few electronics kit sites and found things that sound like what I want, but I guess I'm just not sure if it actually is. As always I would be grateful for any help.

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


what's the difference between -12V and GND? Answered

first, i thought that if some electronics said -X V, it was just GND, but then i saw both in the same circuit,  so what's the difference? and how can you use -12V

Asked by godofal 8 years ago  |  last reply 1 year ago


How do I get my LCD monitor to run on 12V?

My LCD computer monitor normally runs on 240v (Australia) but it was running during a power “brown out”, so is it maybe passable to run it from 12v without opening it (Imeen power it via its mains power cable)? Or would a standard inverter work? And what kind would I need? Power info from back 100-240v~ 1.2A

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


How do I make a device to bring 12v back to 6v without too much power wastage?

I want to run a couple of LED lights that are 6v and I want to use a couple of 12v Batteries. Have been told that a "Spike" would be the way to go but not sure just what that is. Any help would be greatly appreciated and please make the answers simple as I am a tad old and not real sharp on electrics.

Asked by Aussie joe 9 years ago  |  last reply 9 years ago


12v car heaters

12v 120w car heater should draw 10amp per hr and 50amp in 5 hrs , is this correct or is there other factors effects this guesstimate?

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




small DC 12v battery?

Hello all. i am currently working on an air powered rifle. my goal is for it to be self contained, so i took apart a testors airbrush compressor and i am fitting the compressor assembly to a 12v blower motor for an early 90s toyota 4runner. is there any way that i can make or purchase a 12v battery pack to power this thing?

Posted by dans89 7 years ago  |  last reply 6 years ago


Any recommendations for portable 12v batteries?

Could you recommend a 12v battery that is: - light weight - 6Ah or more - quick charging - long lasting - preferably comes with a mains charger. Will be used to power a portable audio system. BTW: Anyone have experience with such suspicious looking solutions as http://www.discoverybargain.com/product/EB00185L/T-1298A_DC_12V_9800mAh_Super_Capacity_Rechargeable_Li-ion_Battery_(Blue)_29525.html ?

Asked by suhajdab 7 years ago  |  last reply 6 years ago


12v battery charging?

I'm making a prop that has 6 12v 6800mAh rechargeable batteries, but i wanted two ways of charging them, a normal plug in to a wall adapter, but also jump lead connectors, so I'm able to charge it of a reving car, or a leisure battery, all my questions are, is what would i need in the circuit to make it safe, and work, imbetween the jump lead charge wires, the normal adapter charger lead, and the batteries them selfs. JUMP LEAD------------  ??  ----------------------------       WIRES                                                          |                                                                             |------------------  ?? -------- BATTERIES ----------12v -------                                                                             |                                                                             POWER ADAPTER------------------  ??  ------------|                       

Asked by infinity1 2 years ago  |  last reply 2 years ago


How do I go about having a 12v battery power a device that runs off of 2x AA batteries?

I am looking to run a receiver that is powered by 2x AAA batteries off of a 12v 12ah battery that is also running an amplifier. If there a way to do this without burning up the receiver? I am looking for a cost effective way to do this. Thanks.

Posted by jgalvin1 5 years ago  |  last reply 5 years ago


Portable 12v Power?

I need to power a 12v dc Digital Photo frame in an interior area with no available plugs. I can charge it at night, but need it to be self powered during the day. What can I use as power? I was thinking of possibly a Computer battery back-up or a portable battery used for jump starting a car. Any and all ideas would be helpful. Basically making a battery powered digital sign board. Thank you!

Asked by larry925 3 years ago  |  last reply 3 years ago


12v power supply for 3 circuits? Answered

Hi there I'm trying to build my first led project and found a led dimmer circuit somewhere on the internet, I need to build 3 dimmer circuits, one for red led dimming, one for blue and one for green but i want to use a single power supply for all three, each dimmer needs 12v to run and I only have one 12v power supply, how can i wire the circuits in order to use the only supply i've got? http://www.reuk.co.uk/LED-Dimmer-Circuit.htm this is the dimmer i will build to run 20 led's, the led array draws very little current, less than 175 mA any help or ideas welcome thanks!

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


How do I go about fixing a Schumacher 10/40/100/200 charger for 12v and 6v auto batteries?

The cooling fan hums when unit is supposed to charge, so that has power. Which components do I check first and how?

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



Need 110 AC to 12v converter help?

Am trying to put a boat radio on my patio, plugging into house current.  The radio uses a 10amp fuse.  All $5 converters I find on the net are for cell phone chargers and the like.  I don't think they have the power I need.  Have seen something about using an old PC power supply, but I'm not sure it will stand up to the weather, even though it will be in a box, and I don't know how to determine which outputs would be 12 volts.  Anything I have found is WAY over budget...I'm trying to find something for less than $25.  Am I on fools errand?  Are there options I don't know I have?  Any help is most welcome! ***REVISION***  I should qualify....the radio is actually an AM/FM CD radio, not VHF or Ham.  Sorry for the confusion. 

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


how do i convert Daft Punk Table (original) to Battery Power.? hlp appreciated?

I would really appreciate any help. i'd likely employ some professional so not to damage it, but don't even know the basics or who i should ask, and what to ask.

Asked by 9 years ago  |  last reply 9 years ago


12V car battery indicator

Hi, I have been trying to design a circuit to monitor my 12V leisure car battery, I'm thinking this should be fairly simple, but its been years since I did any real electronics. So the basic idea: Use the circular bargraph to indicate the level of the battery when a momentary push button is pressed the circular LED bar graph: https://www.sparkfun.com/products/11492 So the range of the battery would be something like 10.5V to 13.5V, there are 32 LEDs in pairs, so essentially 16. 1. So if we take the first LED pair, this should illuminate when less than 10.5V, so that should be easy, as long as there is some life in the battery it should illuminate 2. The next LED should only illuminate at the next step, 16 LEDs, 3V range 16/3= steps of 0.2V So at the following steps: 10.5, 10.7, 10.9, 11.1, 11.3, 11.5, 11.7, 11.9, 12.1, 12.3, 12.5, 12.7, 12.9, 13.1, 13.3, 13.5. So for 10.7V I guess I should use resistor before each LED. 3. The LEDs should light up after a momentary push switch is triggered, I would like this to be graceful, so the ring lights up smoothly one LED at a time as the voltage increases, I guess capacitors between the resistors and LEDs? This is the simplest way I can think of doing it, I have seen circuits which use a LM339 chip, but that can only monitor 4 voltages, perhaps 4 of these in series could do the job? http://www.electroschematics.com/7068/lm339-lm239-lm2901-datasheet/ I think this is the way to go rather than using inline resistor/ capacitor pairs? So I am a clear novice when it comes to electronics (but I'm enthusiastic), so if anyone can help me with this I would be more than happy to put together an instructables how to, something similar has been done before: https://www.instructables.com/id/Car-battery-tester/ In that example only one bar is lit, I want the other bars to stay lit. I can use Eagle to make the PCB diagram and get it printed, but I need to figure out what components I need and how to do it! Thanks for any help. Gary

Posted by garynobles 5 years ago  |  last reply 5 years ago


​I want to produce DC 12V 5A from AC 12V 1.5A.

I have a12v 1.5A  transformer. ​I want to produce DC 12V 5A from AC 12V 1.5A. Is it possible? If its possible than tell me HOW?

Asked by Shezi007 1 year ago  |  last reply 1 year ago


12v battery low voltage disconnect with relay? Answered

Could i make 12v battery low voltage disconnect with relay and resistor? I was thinking if put resistor in series with relay coil i could lower current so relay would barely work on 12v but when it drops to 10v voltage after resistor would be so small that relay would disconnect

Asked by Cekpi7 2 years ago  |  last reply 9 months ago


converting 110v christmas lights to 12v

In a web search looking for 12v Christmas lights to run off my small solar system, I found this; http://www.fly.net/~thundt/xmas12v.htm This looks very straight forward and easy enough to do.Has anyone here tried this?I bought a small set of solar powered at Target ($14.95). Way under powered and last only a few hours. It's going back today!This looks like a way to get brighter, longer lasting lights and I don't have to run my converter. My 160 AH battery should power it up nicely, I would think...Think I found a project for this afternoon!

Posted by olddawg 10 years ago  |  last reply 4 years ago


Convert AAA battery power to 12V jack?

So I figured out a really good option for my external rumble pack I want to make, I see these Wii lightguns use X2 AAA batteries and have a micro switch that engages the internal rumble motor on the handle of the gun. The batteries are connected to a microswitch and the switch is pressed after the trigger is physically pulled. How can I convert the AAA batteries power method into an external 12V power connector for continuous use and stronger motor vibrations etc? Like I said this is my first DIY thing. I want the AAA battery method to be converted to a stronger more capable 12V. I plan on buying some strong force feedback motors that need 12V. Eventually adding a small Solenoid too.

Posted by JonathanH248 1 year ago  |  last reply 1 year ago


Any idea how to build a 12V iron box???

I'm coordinating a community upraising project in Kenya, and we're doing green energie workshop as well as re-use of plastic bags by fusing them so we're looking for a green way to do it... 12V Iron box would be perfect... Thx for your consideration.

Asked by longcesttoi 8 years ago  |  last reply 2 years ago


How to convert a 12V LED string designed for use with an AC/DC power converter for direct wire to a 12V DC system?

I am trying to use a 12V LED light string for lighting in a bus conversion.  The LED string is 12V, but comes with a AC/DC adaptor so it is intended to be plugged in to an AC outlet...however, I want to connect it directly to the bus/RV's 12V DC electrical system.  I'd planned to just use a DC connector to replace the power adaptor and connect directly to the 12V circuit/wiring...but I think I need to regulate the amperage going in to the LED string. ??  I am not sure what to use to regulate the current of that circuit.  I've read about LED drivers, but most seem to be AC/DC...and I want DC/DC.  Also, the constant current drivers don't seem to match up to the current the light string would require if I assume the power adaptor is supplying the correct amperage.  Help? The LED light string does not state many specs, except that it is 12V / 6W and uses 100 micro/fairy LEDs.  The AC/DC power adaptor that comes with it says the output is 12V/1A, therefore I assume I need to regulate the amperage to 1A...but wanted to confirm with someone more knowledgeable than me.  The RV electrical system is composed of a 440AH battery bank and from what I've read about LED's I can't just wire it into a circuit fed by that much potential current, even if it's fuse protected at the DC distribution panel.  Any suggestions?

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


will a 12v 23A battery be enough to make nichrome wire glow?

Hello, i am going to try to make a smoke grenade and have determined tat glycerin released into permanganate by pull pin trigger is not stable enough to use so i am thinking of using a peice of nichrome resistance wire and a 12v 23A (model number not 23 amps), as the disposable electricity source to make the nichrome wire glow red hot which will ignite match head powder which will ignite the smoke powder. i want to know though, considering that this wire burns up straight away with a 9v battery shorting it, will a 12v 23A mini battery have enough power to get the wire glowing ? if not, are there any fast discharging batteries that are the same size or smaller i could use? ill post the exact specs of the resistance wire as soon as i find them, but for now all i can say is that its about as thin as hair.

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


Best way to wire four 12V LED light strips to a 24V power source? Answered

It's been over 20 years since I took an electronics class, so I'd be grateful if I could get some help with this.  I'm trying to figure out if four ready-made 12V LED light strips can be wired to work with a 24V power source (two 12V 8Ah SLA batteries wired in series) without damaging anything. I want to add lights to a bike party sound system I made from an Instructable (diagram below).  Can I just wire the LED strips in parallel and wire then just wire that in parallel with the mixer?  Or is there a more efficient/safer way of doing it? Here's a pic of the ready-made 12V LED (12 LEDs / Red / 115mm strip length)

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


How to power 12V LED Strip with 5V USB via Computer Mouse Controller?

Hello, I'm a electrical idiot, really appreciate it if you could explain in layman terms. I want to use the mouse electrical board, to power and control colours of my LED strip. This is for the chassis and random lighting. Note that I HAVE to use the mouse circuit board to control LED strip colours (Not Power Supply, but preferably so to reduce clutter) So, I would have to remove the LED (which have 4 connections) from the mouse, and replace it with my LED strip via soldering wires. the connection would then be desktop/laptop pc - usb port - usb cable - mouse board - led strip (am I right?) I bought 12V LED Strips with the following specifications below. I will only be using 3 sections in series, each section has 3 LEDs, total 9 LEDs. This means a total power requirement of 1.8Watts right? But the LED strip is 12V, whereas the USB mouse is 5V. Since its only 3 sections, is 5V sufficient? Again, i'm really noob at this. The LED strip coincidentally also have 4 ports/wires. +12V, R, G, B. I'm assuming RGB ports are for the controllers, while +12V port is for the power supply. Color: RGB (Red Green Blue) Flash SMD LED View angle: 120° Working voltage: DC 12V Power: 0.2w/led ; 60w/300leds; Working Current/5Meter: 5A LED quantity: 60LED/m, 300 LEDs Lumens: 900LM Operating temperature: -20 to 50 ° Lifetime: 50,000+ hours Size: W10*H2mm Thanks for your help!

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


19v to 12v without current drop?

I have laptop charger of 19V 3.42A(65W).i want to step down that 19v to 12v without any decrease in current.i need 12v 3.42+A  what is the simple way? can i use resistors to radius voltage without current drop? can i use LM7812C to get 12v 3.42+A there is ant way to get 12v 5A(65W)

Asked by vina1991 3 years ago  |  last reply 10 months ago


Convert a 12V 1A charger to run off 12V 300mA?

I have a Nitecore Intelicharger i2, which has a 12V dc input for power, however it requires 1A of current to function. The power supply I want to power it with can only output 12V at 300mA. Is there a way to mod my charger so that it runs on a lower current. Thanks! 

Asked by GabrielE19 2 years ago  |  last reply 2 years ago