12v Definition and 156 Threads

Sorry if this is a very simple question but i have been googling and looking around for a straight anwser but can seem to find a solid answere or draw a solid conclusion from information I've reached. So I have a rgb led light for a car, the box says input 12vDC. if I wanted to set these up...

I have a C-Pap machine, and I'd like to put together something to power it for a few hours if we have a blackout. Wiring two of the above lantern batteries together should produce 24 volts. But I can't find any info on how much wattage you can draw from these before the voltage will sag. It...

Hey all, I have a 5v IC that is triggered by a sensor to unlock the 12v lock, I am using a NPN transistor as a switch with the 5v VCC as the gate, I need it to sink back to the GND of the IC without blowing it, is this safe? If not what changes would you suggest, it has been years since I've had...

I am designing a reciprocating saw that I plan to use a scotch-yoke mechanism to convert rotational kinetic energy into linear kinetic energy. I want to spec out a motor and the final thing I need to calculate is the required torque. The motor must be 12 Volts and I need to know the required...

Dear friends, I am in a search of a temperature controller for 12V, 40W ceramic cartridge heater! I can not change the heater because of my application. I want to purchase a simple PID temperature controller available in the market. But I am not sure whether they can provide me the 12V output...

I want to mount a camera on the front of a tractor(Sony RX0M2, similar to a gopro). The camera will eventually be used for image processing. A PQ-12 micro linear servo (see here) will be used to turn the camera on/off. It is being run by a Raspberry Pi 4B. All components in this project will be...

Hi. I am new here. I have a question on how to speed control a DC motor running a pump. The pump is a seawater cooling pump cooling a large V8 motor. Therefore I need to control the RPM, based on the temp of the V8 Motor. Any ideas?

Setting up a test stand that will need a controller to cycles a device ON and OFF at an adjustable time interval (allows me to make the ON duration and OFF duration whatever I want). It will also need to keep a count, so I can track the cycles count and also set a limit on cycles so it will stop...

Hello everyone, Recently, I bought a R/C Helicopter which has a 7.4V 850mAh Lipo battery. I enjoy flying it in the field but I have a problem charging its batteries after each flight. I have no access to any car battery or 220V wall socket. I bought a Lipo charger for it which needs at least...

I am trying to build a Voltage Doubler to use a motorcycle 6 Volt a.c. alternator's dedicated headlight coil (which presently runs a 36W incandescent headlight bulb) to provide 12 Volt d.c. to drive a commercially-bought 12V LED headlight unit (also rated at 36W). Frequency will be (1500 ~ 5000...

Homework Statement Need to build an electromagnet. Want to build one to work on 12v 7Ah battery with a switch. Needs to be on for up to a minute. Gets pretty hot. Any ideas what components can be wired into circuit and how to control current to retain magnetic field strength but reduce the heat?

I am working on a rural project that requires continuous use of 12v battery as a single unit,to keep the project running i need to recharge the battery . How do i connect an alternator to recharge the battery while the batteries is in use. or can i use a Capacitor instead. My thinking is since...

I would like to know what will happen when i accidentally connected a 12v and GND to a 4 pin molex, in its GND pin. The picture is the example of the 12v 4 pins connector. I accidentally plug my 12v and gnd wire to the respective pin 1 and 2 of the ATX connector. Will it cause my circuit board...

Why are these batteries stated as 12V batteries if often they have a reading of greater than 12V e.g 13 or 14 and when you rev the engine hard while in neutral and do a voltage test on some components in the car circuit you get a reading of much much greater like 40V! How is this working? Could...

Hi, I want to run a cheap 5 meter led strip along the inside of my boat for cool night lighting. It will be powered by a 12v deep cycle battery. I was hoping y'all could double check what I was thinking before I set something on fire... Here is the led strip...

Hello, I'm currently doing an electrical refit on a 29' Bristol. I have an anchor/steaming light for the top of the mast. I'm connecting them to two separate single pole single throw breakers. My problem is that I need the steaming light (fwd light) to be able to come on indipendantly from the...

Hey all, A 'rank' newbie here, so please bear with me. ;-) I have a 'solar charged' 12V battery (with charger) for an electric fence charger. I'd like to use this solar charger and battery to power a 12V AC (I think) low voltage landscape bug zapper. It 'must' be 12V AC, I think? Is there...

Please i need help on a simple method of converting DC to AC The desired AC output is to power a mini laboratory incubator

I have to charge a 12V 7AH battery using a wind turbine. For this purpose what kind of battery should I employ?

Greetings. How would I go about finding a way to use an audio signals frequencies to control the positive connection on a 12v dc led circuit? In other words, have the visual effects you get hooking up a dc led strip to an amplifier, but instead controlling the dc positive output to the strip...

Hi, I am new to forum and know very little on electricals and electronics. Now i have a few OSRAM Ostar 12V LEDs (https://goo.gl/04rrZy) with heatsink which i am working with as a hobby. Power source is a car battery. Here i list all my query one by one 1. As per the datasheet of this LED, it...

Hi all, a bit of a hypothetical for you. If I wish to drive a 3V LED at 20 mA from a 12V battery, I can use a dropper resistor. I subtract the LED's forward voltage from the 12V to get 9V, and divide this by the 20 mA, to get the value of resistor needed. R=V/I = 9/0.02 = 450 ohm. However...

Hello, I was reading a previous thread that is now closed. What I'm curious about is a simple wiring schematic. I want to charge a battery on my trailer while it's hooked to the truck from the trailer 7 pin rv connection. The rv connection has a 12v hot all the time wire that I could use to...

The battery post is moving up and down. It doesn't seem to want to come all the way out. Will the battery still perform properly or is it damaged? Can it be repaired? Pictures attached.Thanks in advance.

I am trying to figure out the best way to hook up two 12v DC peristaltic pumps to run as close to the same speed as possible. The manufacturing tests had the pumps running within 10ml per minute which is acceptable; when I hook the pumps up in series they are not even close. When hooked up in...

Hey guys so I have had this idea for an electronics project for a long time, and it basically goes like this. It's a floating speaker box for floating on the river when we are rafting. Design considerations are that it would have to be unsinkable (as much as possible), also loud and with a...

So I am try to run this 12V 30 pis pump and it says to run it at 2.2 amps @ 30 psi. When I supply the pump with 12V I get a reading of 1.4 Amps so I don't really know what it means by the 2.2 Amps and the @ 30 psi means. Can anyone tell me what this means? Thanks

A large number (56) of 18 gauge-ish connection pins are presented by the connector. They are wired together in large groups on the "client" side of the connector (4 electrodes). We wish to re wire these groups together and then split them off into 24x 18 AWG a few feet removed from the...

Hello i am abeginer i have to connect a 12v dc motor can i connect it to two 9v batteries in series meabs a total output of 18V.

I have a mws freedom pmg 12 volt 1600 watt PMG with falcon mach 3 blades. Live in city so turbine is only 12ft off ground. Don't get good wind. Can I use a 24 volt pmg to charge my 12 volt battery bank? Have charge controller that can handle high voltage and will dump at 14.5 volts. Also have...

Setup: I have a portable solar panel (for camping, etc) that outputs to two USB ports (2 amp). I want to use this to power a small Li-ion charger. I know that there are products/adapters I can buy to achieve this but I am fascinated by the science of it and want to know *how* all this works...

Hi. I have to test a couple PSUs (ripple, regulation, etc.) that are rated 12 V 62.5 A. In order to do so, I need a test load; I was thinking about using nine 2 ohm 100 W 5% resistors (about 3 usd) in parallel (giving 0.22 ohm 900 w). Taking into account the tolerance of the resistors, I get a...

I am hoping to run the following motor using a 12v (car battery). This battery would run until a charge is needed Just curious on what's needed for an Inverter and how easily/cheap it could be accomplished.. Motor specsFHP-Motors 1~mot. 100w 115v 50/60 MHz I'm novice in...

What output does a 12v motor give. I need to power a heating element that requires 12v, can I do this with a 12v motor? If not what size motor do I need? Thank you in advance for any help Sarah

Hi could anyone please help with this:- I have a 12V 90Ah automobile alternator. is there a way to increase the output volts beyond the 14/13.8v to say 192v?

Hello, I'm trying to build a hub to connect several circuits that have a PIC microcontroller and be able to select one of them and download the program to it. The circuit that I have in mind to select and program one PIC microcontroller is this...

First off, I am a ME student, and I only know enough about electricity to get myself into trouble. I am looking to build a flashlight using a 100w LED chip, a step up constant-current transformer from 12V (or 24V) to 34V and either one or two 12V batteries (higher voltage to improve efficiency)...

can you charge a 12v car battery with capacitor

Help! I am connecting a Sergent control panel (to power a motorhome 12v/240v system), with a 1200W converter for a solar panel that trickle charges a 12v battery and a leisure battery. This would not be the problem but my truck runs on 2 batteries that run 24v. Does anyone have an idea on how...

I'm not so smart when it comes to electrical things, so please forgive my ignorance. Here's what I am trying to do. I have a quad axle dump truck, I'm trying to have the drop axles automatically come up when put into reverse. The drops are raised and lowered via 2, 12 volt solenoid valves. I...

If CCA can be translated directly to Amps then would I be able to run the battery at max capacity for only 3.6 minutes? 18 / 300 * 60 = 3.6 Minutes? Or am I looking at something wrong?

Hi, I recently bought a smallish 12v DC solar panel for trickle charging my jetski battery. I've had a look at the panel with a multimeter and in good sunlight it makes easy 24V but very very low current. I was wondering if I stick a 99pence buck converter on in, forcing the voltage to a max of...

Hi! I want to design DC power supply 12V 2A. Here is what I have done. Firstly, we need to transform AC main voltage. I will use transformer with ratio Np:Ns=16:1 : We must choose diodes with maximum forward current more than 2 amperes. I will choose UG8JTHE3/45.. This diode has maximum...

Hi, I have this wind turbine (http://m.ebay.co.uk/itm/251320008073?nav=WATCHING_ACTIVE&skus=Output:12V&varId=550270984212) in the UK, wall mounted about 18ft, its not in the best position, but it still turns pretty fast, enough to hear the blades spinning from inside, and for it to generate...

I have a strand of 12v led lights that I'd like to use as under mount lights for my kitchen cabinets. Is there a way to hook the lights up to my existing 110v wiring assuming there is a converter necessary?

Hello Guys My baby is a Suzuki GN125H (Bought in year 2013). I have been pondering for a while to have some kind of dash cam installed on her. Thus I thought to have a power supply installed so as to get power for the dash cam (only to be used when the motorcycle is ON and running). My...

We had a heat recovery ventilator that was controlled by a mechanical timer connected to a 120 v line (the line has its own breaker in the electrical panel and is also connected to a few lights and plugs) in each of three bathrooms. The 120v line is connected to a metal electrical box marked as...

< Moderator Note -- thread moved from ME forum to Homework Help/Engineering > Hi, I Am an electrical engineering student and I want to make a 12 DC car jack for my senior project, but till now I couldn't find the informations I need to start the project. How to calculate the force and torque...

I have attached a 12v DC electric drill moter to a fishing pole. I need a 12v dc motor controler or PWM that will allow me to cut the rpm's down from 550 rpm to about 20 to 100 rpm. less then 20 would work better for bottom fishing. I believe a PWM would work but I am not sure as to a...

Hello All, I have a stater that puts out AC voltage, at max RPM it produces 40 volts. I have a voltage regulator installed parallel and it controls volts to max 14+v AC. I need to run an 80 watt 12V DC cooling fan so I installed a little block that has 4 diodes inside. Possibly this is...