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   |  last reply


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. 

Topic by sirus17   |  last reply


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

Question by Andrew_48   |  last reply


12v to 12v lead acid charger? Answered

Is there any way to make or buy a 12v battery charge another 12v battery?

Question by Daniel Deacon   |  last reply


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?

Question by celalboz   |  last reply


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------------------  ??  ------------|                       

Question by infinity1   |  last reply


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!

Question by larry925   |  last reply


5v to 12v convert

Hello, I want to connect a portable solar powered rechargeable to 2 DC fans of 12v to cool my car. 1. I have 2 options of portable solar powered: (A) 1500mAh, outputs: 5.5V / 800mA (B) 2000mAh, outputs: 5V 500mA     which one is preffered to connect to those PC fans? 2. most of the PC fans are working at 12v. I don't quite sure if I'll build simple 5v to 12v regulator it will works and produce enough airflow. Thanks.

Topic by ashakif   |  last reply


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

Topic by kritas   |  last reply


-12v leads to GND?

First off, i apologize for asking so many questions. google couldnt tell me a single thing about what i wanted to know, which was how the -12v is created and why a computer needs it. so i turned to a broken power supply to see is the -12v connects to a IC of some sort, which i would assume creates the strange voltage, confirmed by a datasheet. i completely traced the traces with a multimeter and at one point a capacitor went to ground close to where the -12v connection is on the board, after an inductor of some sort. the trace continued, and lead to a pin on the transformer, much to my disappointment. BUT that same trace was directly connected to ground, so now i am confused, does the inductor type piece createthe -12v? there was a diode as well, but i thought nothing of it or its place on the board.. i have a feeling i should have, shouldnt i? fed up and confused by the power supply, i turned to my motherboard. where the -12v leads to a smd capacitor and then traces from the capacitor, to ground, and nowhere else as far as i can tell with a multimeter and a dark blue motherboard. then i bring up the picoPSU, how do they make the -12v, if it is even made? is there a chip responsible? or a inductor like i found in the power supply? -5v has been omitted form power supplies, so im assuming that the same can be done by -12v, right? and wouldnt you get a -v type measurement if you put the + test lead on the - terminal and vice versa?

Question by zack247   |  last reply


7v from 12v?

I need to run a 7v / 1.6 A DC water pump and a 12v / 1.13 A DC fan from a small portable battery pack. If I use maybe 8 "D" cell bateries, do I need a converter to power the 7v pump or will it work with 12v? Thank you,

Question by fastrack777   |  last reply


18v dropped to 12v?

I want to limit two 9V battieries, in serial to 12v. I want to run a cold cathode off em, if the strain is too much, I'll join two parralell sets of two 9v batteries in the circuit. Anyway, how do I do it? I can't find any 12V regulators at all, and I don't know what sort of resistor I'd need, is there one that would limit it to 12V, with the standard 9V battery ampage? How could I archive this? Thanks.

Topic by Josho   |  last reply


220v to 12v transformer Answered

Hi I have two questions. In the drawing below, which diodes do i need to use and will this be compatible with a hand crank generator? Thank you for any help!

Question by GhengisKhan1981   |  last reply


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??

Question by chinnuabhi   |  last reply


12v led help

Ok im a noob when it comes to leds and electricity, but i was told someone heremight could help with my delima. what im trying to do: drill holes into tail light on my ninja and put yellow leds in the hole and wire them to the existing blinker wires. the problem: messured the voltage coming off of the wire and it pulses from 0vdc to 7.22 vdc i have been looking on ebay at prewired 12v leds but dont know what im needing. any help wouldbe greatly appreciated!!!!!!! thanks,                   kyle

Topic by pierce-custom-bikeworks   |  last reply


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

Question by JustXtreme   |  last reply


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

Question by zutt   |  last reply


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 :) ! 

Question by iconicbuck   |  last reply


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.

Question by Squibo   |  last reply


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! 

Question by GabrielE19   |  last reply


Powering 12v LEDs from 12v Deep Cycle Battery

Hey all, I'm trying to power some 3528 LED strands to hang from a shade structure I have outside. I picked up a 115 Ah 12v deep cycle marine battery, but I just wanted to make sure I could wire them directly to a distribution block without blowing anything up. The strands draw 6A of current so I was going to find the closest fuse to that value (10A?) to prevent any chance of overpowering the control boxes. Does this seem correct? Image shows roughly what I'm trying to do (black boxes around red wire are fuses, 1-3 are the LED control modules) Greatly appreciate any help!

Topic by synaptech   |  last reply


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?

Topic by dans89   |  last reply


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 :)

Question by tyranasaurus tyler   |  last reply


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 ?

Question by suhajdab   |  last reply


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!

Question by efrarios   |  last reply


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

Topic by garynobles   |  last reply


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...)?

Question by csavage6   |  last reply


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. 

Question by craigo   |  last reply


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

Question by BlueSuneLIght   |  last reply



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

Question by C2L   |  last reply


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.

Topic by jgalvin1   |  last reply


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?

Question by grantdylan   |  last reply



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

Question by yulc   |  last reply


What resistor for 12v HID?

How do I create a cheap " ballast" for an hid globe in my boat. 12v static and whilst charged by outboard stator.  Do I need one? 

Question by gordyguy   |  last reply


5v to 12v step up

Hi, I am looking to power some led's by USB. Problem is that the led's are 12v. Here are some example led's: http://www.ebay.co.uk/itm/12V-SMD-1M-60-LED-STRIP-LIGHT-RED-HOME-AQUARIUM-CAR-/290571186666?pt=UK_HomeGarden_Lighting_Lamps_Lighting_SM&hash;=item43a76471ea#ht_3932wt_1396 Would something like this do what i want it to do?:http://www.suntekstore.co.uk/goods.php?id=14002311&utm;_source=gbuk  Also looking at the step up booster i have no idea where i would solder/connect wires to the device? Any help would be appreciated. ItzMar

Topic by ItzMar   |  last reply


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 .....)

Question by _Boltz_   |  last reply


12v double flash with Arduino?

Hi, I am in the middle of trying to figure out how to get my Arduino to power a 12V LED on a double flash for use in a model (USS Enterprise NCC 1701). The trouble I have is the double flash only has a delay of 0.7 secs so I think if I used a relay it would not be quick enough to turn on/off? The LED powers OK and runs from the Arduino on it's normal 5V, however it is not bright enough (I am going to hook them upto fibre optic so need the extra brightness). Any ideas how I can do this, presumably putting 12V into the USB connector would fry my Arduino? I have never programmed or used an Arduino before, nor have I done much in the way of electronics for 25yrs, so I am a little rusty, any help would be appreciated. To give you an idea of the speed I require, this is some of the program (within a loop). digitalWrite(7, HIGH);   // turn the LED on (HIGH is the voltage level)     delay(70);              // wait for 0.07 second digitalWrite(7, LOW);    // turn the LED off by making the voltage LOW     delay(70);              // wait for 0.07 second digitalWrite(7, HIGH);   // turn the LED on (HIGH is the voltage level)     delay(70);              // wait for 0.07 second  digitalWrite(7, LOW);    // turn the LED off by making the voltage LOW     delay(3000)         // loop after

Question by Pittnuma   |  last reply


Charging multiple 12v batteries

I have eight 12v 18Ah SLA batteries that I need to wire to get 48v. I need to be able to charge them all at once, but can't find a 48v charger anywhere. Is there a way I can wire a 12v charger to parallel charge the batteries while they're wired in series?

Question by Charlie_Szasz   |  last reply


12v 3w led project

I am trying to build a "knight rider" light for my car using 3w led's. I know enough that I want 2 per section (8 sections total) and to wire the led's in series. They will be mounted to an aluminum bar, so I might not need heatsinks. They will be controlled by a "chaser light" sequential controller. The specs are: yellow 3w led forward voltage:  2.9v - 3.3v forward current: 750 mA I have researched and found led drivers but they are a bit more expensive than I would like to pay, since I would need 8 of them. Can anyone help me with what I need for this to work on my 12v dc automobile? Do I need transistors, diodes? What resistors do I need (value, wattage, etc)? I need major help from the electronics gurus. How do I do this??? I posted this in the workshop section mistakenly yesterday.

Question by gizmo13   |  last reply


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

Question by gada888   |  last reply


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?

Topic by haizad86   |  last reply


12v dc motor selection Answered

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

Question by amey123   |  last reply


0-12V Digital Display?

Here's what I need, and haven't been able to figure out how to do it: I designed a motor speed controller that runs a 12V fan.  Speed control is via PWM through a 50K linear Potentiometer. I need to be able to read the percentage of run voltage ie: 0V=0%, 6V=50%, 12V=100%.  I want to display this on 3 7-segment LED displays. Anyone with insight would be greatly appreciated. Brian

Question by BrianAriz   |  last reply


help on designing a 12v UPS? Answered

We have a problem with kids coming into our garden, vandalising our plants, breaking into our shed etc. we have decided that installing a cctv system in our home is a good idea as even if it doesn't stop them coming in, it will be solid evidence to take to their parents. problem is, we have regular power cuts and i would like the cctv to be recording 24/7/365 (especially in the shed because that is where our bikes get stored) i have two 12v 7ah SLA batteries that i am donating to the project, iknow that they need 13.8v and around 500ma to charge. i need 16 camera outputs, and then a couple of spare outputs for aux devices (router to keep it connected to the internet, mics, infra red lamps etc) the dvr its self wants 12v 5 amps input so i think for that i will make another psu just for that with maybe 2 or 3 12v 7ah sla batteries. i have baisic electronics knowledge, have access to pcb printing facilities and can use eagle. any help at all would be amazing, the main things i need to know is: how to get 13.8v from 240v ac, how to power all the cameras from 240v ac and have a smooth switchover from mains to battery. thanks in advance - luke

Question by ljarrald1   |  last reply


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.

Question by Squibo   |  last reply


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

Question by godofal   |  last reply


load a 12V battery by the cigarete lighter

Hello guys, I want to make a publicity trailer with led's that will stand at party's (and on the side of the road in the week). This trailer will stand alone and will be powered by a 12V car battery. I would like to charge that battery while moving it with my car by a long cable to the 12V socket in the car. Should I place a resistor to limit the current or is this not necessary? The trailer is for my youth movement. (sorry for my bad english) Grts, Dieter Belgium

Topic by DieterD4   |  last reply


12v trickle charging rechargeable AA battery's?

Just wondering if anyone knows whether it is would be possible to charge 10 AA rechargeable battery's in series with a standard 12v solar panel without any specialist kit ? Thanks

Question by _TEAP0T_   |  last reply