Electrical Engineering Stack Exchange
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Questions tagged [12v]

Deprecated tag. Do not use in the future.

Deprecated tag. Do not use in the future.

684 questions
8
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2 answers

How to make -12V from a +12V supply?

The equipment I have needs +5V +12V and -12V supplied to it. The old PSU which provided all the voltages blew to bits. I have sourced a PSU1 +5V (30A), and PSU2 &PSU3 (two identical +12V (2A) stand alone supplies). Am I right in thinking if I link…
user40442
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2
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2 answers

With a 12v circuit feeding 5x 300w inverters over a distance of 15meters. What cable size should I use?

I have the job of wiring a divelivaboard which is 30m long, and the customer wants 300w inverters in each cabin. He insists on a ring main feeding everything and I went ahead and bought a bunch of cable before discussing anything. The total length…
Stu
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2
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4 answers

How to automotive/boat devices limit voltage to 12 volts?

I live on a boat and get all my electricity from 12 volt battery arrays. The batteries are charged using either 1) alternator on the diesel engine or 2) charger/ inverter powered from shore power at a dock or a portable generator. Yeah, some 120v…
Bill
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1
vote
1 answer

How to get 12V 2A power through an extension cable?

I have an AC to DC (12V, 2A) converter (/transformer) plug which I am using to power a wireless router. The connector has "center positive" polarity and the size of the connector is the ubiquitous 2.1mm x 5.5mm. The nearest electrical outlet from…
hamslice
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1
vote
1 answer

12 volt kid car charging

Kid car use a 12 volt batterie, that need to be charge. We need to Open the front car motor cover and unplug the connector for the batterie and plug the charger direct to battery for charging I would like to to like a real car charging…
AGI2020
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1
vote
2 answers

Can multiple window blind motors run on the same low voltage wire?

I have a wall of 8 windows using battery operated motors (8 AA batteries in a long tube). I am looking to run these off a DC power supply instead. I can't get the exact specs on the motors, but a Reddit user who successfully converted his were 12v…
spockdude
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1
vote
1 answer

12v 400 amp cable size for winch or two cables instead of one

I need to run cable to my 12v recovery winch. Run is 15 ft from battery. Winch info says at full load it pulls 400 amps. Instead of running one positive lead due to the size it would need to be i need advice on size of two copper cables to run…
Richard Powell
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0
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2 answers

How to run 12V compressor directly off battery?

I have a 12V air pump (runs out of the car cigarette lighter). It had worked ok the first few times then stopped working, with smoke billowing out of the receptacle while it was plugged into the socket. I opened up the pump's cigarette plug and it…
user26831
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0
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0 answers

How to regulate a battery + solar panel setup so it’s under 12 V?

I am making a remote controlled driveway gate and the problem I’m having is the battery/solar panel together is putting out more than 12 V at times and frying my remote controlled relay board which is only rated for 12 V. What can I use to keep it…
Tim
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0
votes
2 answers

DC motor to start and park in the same place with timer

I am trying to make a 12 volt DC motor start and stop with a timer. It needs to park in the same place every time. I am also using a double pole double throw micro switch. How can this be accomplished?
RH1
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0
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4 answers

Current rating for 12v plug on 300W in-car inverter

I have an in-car inverter which is rated 300W. This is the only labeling: I need to source a 12V cigarette socket plug to connect to the input. I have found the following one which is labled: Carpoint Universal plug 6-24v max 8amp Assuming I…
v25
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0
votes
1 answer

Regulating 12v source to 12v

I wish to use a 12v deep cycle battery (I used to use this for my CPAP, when camping) put it on a constant charge, preferably a cheap trickle/float charge circuit, like found at Harbor Freight. I want this to power two devices: will run on any…
Thomas
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0
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1 answer

12Vdc motor problem

I have a 12vdc motor, a big thing connected to a hydraulic pump. I suspect its broken. It has a 40amp fuse so its designed to draw under 40 amp on average, and up to 50 amp peak. When i ohm it its 0,2 Ohm, I think that is very low. I cant find data…
Nils
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0
votes
3 answers

Three output voltages not adding up to input voltage – how?

I have a 12 V power supply that connects into a custom made power board that then has three 5 V outputs. There are three things connected to it's working all the time. How does that work, because 3 x 5 is 15 not 12?
Thomas Horsted
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0
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3 answers

12v PSU: Harmless or not?

i touch the PSU|(power supply) bare wires 12v with my hands but nothing happens when power supply is on its harmless or not? please someone reply me i want to know,thanks in advance,i use the power supply in a socket and for beacons 12v
info
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