Questions tagged [12v]

Questions relating systems powered by a 12 volt supply. This may include automotive systems and lead-acid batteries that are nominally 12 volts although be aware that under many conditions the actual voltage may be several volts higher.

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1answer
34 views

Normally Closed Negative Output, Positive Input Relay

I'm attempting to wire up my remote start in my manual transmission vehicle to ONLY start when the vehicle is in neutral. The way that the transmission works is like this: When in neutral, resistance ...
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3answers
81 views

What is this small circuit board used for in a 12v light?

Repairing a home-made disco light that was used in a nightclub during the 80's/90's and it consisted of 16 12v 50w lamps arranged on 8 legs. I have discovered a small circuit board within each lamp ...
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1answer
36 views

How to check (6 pin) PCI-E power rail on a pc powersupply?

Could anyone tell me if and how i might verify whether or not a PCI-Express 6 pin power lead on a PC is outputting correct voltage(s) ? A while back, I decided to try to refurbish a graphics card ...
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3answers
71 views

Using 220V wiring for a 12V setup

I am living in a static house that uses a 220V system for lighting fridge etc, I wish to set my solar system up using 12V not 220, I have a gas fridge and don't need 220V, I will only have 7 LED ...
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1answer
111 views

Is my planned 12V solar panel system safe? [closed]

I'm new to electricity and I'm wondering if what I plan to do is correct. Thank you, tell me if something is wrong or dangerous. PS: I already have a simple setup working (PWM + BATTERY + SOLAR ...
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0answers
45 views

12V - How to activate a pump if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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1answer
26 views

Two power sources into appliance (12Vdc)

I am creating powering board for LED strips inside the cacti glass house. It consume 12V DC around 2 amps. I would like to power them up from battery (charged by solar, lead-acid battery 20Ah), but if ...
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3answers
76 views

micro-switch 12V DC use in vehicle?

Using 12V DC (max 3 amp) linear actuator in a standard car, I need to use some micro-switches in the power circuit to prevent the actuator powering, if it's not in the correct position i.e. won't ...
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1answer
26 views

24V 3D Printer - power ratings

I have a 3D printer at home and looking to improve some parts. The PSU on the printer has no labels so I'm not certain what it's doing - but the 3D printer's spec. sheet says it's 600W peak and it ...
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2answers
84 views

Raspberry Pi Zero 12V Battery backup to 5V - do I need the resistor?

I found this diagram on the internet which seems to divide the voltage down to 5V and still be able to deliver 1A with the 7805 just like I want. It will use a 12V lead acid battery and a 12V IN ...
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3answers
99 views

12VDC to 3 Phase 400V

In order top prevent my seldom used deep well pump (3 Phase, 400V) I plan to daily spin it up for a few seconds. Where the pump is located, the is no power supply (I operate the pump using a ...
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1answer
106 views

Need to determine a mosfet, and wouldn’t mind a little education in the process

I want to start off by saying that I am a complete electronics newb. I know a little but am always looking to learn more. With that said I am asking for a little help and a little learning. Here’s ...
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0answers
52 views

12VDC Switching to 17VDC high amerage

It's been years since my undergrad work as an EE. I am a physicist and medical researcher now, but, as a startup, we all take on anything we can. Let's face it... 12VDC high current PSU's are cheap. ...
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1answer
21 views

BMS for 2S Lipos

I have 2 lipo batteries in series, each has a built in protection circuit and these specifications: Voltage: 3.7 Vcc Capacity: 1000 mAh Maximum discharge rate: 2100 mA I need to charge them, but I ...
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1answer
49 views

Power inverter - what component blew

I have a new 2 kW inverter connected to my 12 V lessure battery. As soon as I had plugged a 1 kW appliance into it it blew. Pic shows a component that looks like it's melted. I'm very limited with ...
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1answer
61 views

What is the cost of converting 12V (lead acid battery) to 220V and back again to power 12V appliances?

I have a small house measuring ~ 8m x 4.5m. It is in Indonesia and power outages are expected daily. Probably the daily power outage is on average less than half-an-hour, but sometimes the outage can ...
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4answers
129 views

Motorbike turn-signal blinker starts OFF, I want it start ON

I bought a cheap blinker that claims to be good for LED bulbs (so the frequency is independent of the load.) It is true, but it has a flaw: the lamps go ON only after about a half second from when I ...
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1answer
50 views

Using a Computer PSU for its 12V output for high wattage loads [closed]

I'm looking to install some LED light bars (primarily designed for use on off-road cars) as fixed outdoor lighting on my property. I see they have models that use up to 700+ watts of power (for crazy ...
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0answers
26 views

TPS55165Q1 does not work in boost mode

I need a power supply that delivers 12v with an input between 8v and 35v. That's the reason I bought a couple of TPS55165Q1 from Texas instruments. I've made 3 different PCBs with a similar circuit. ...
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2answers
91 views

Will a 4 Ah 12 V battery be fine for a 2 A 12 V diaphragm pump + a Raspberry Pi?

I've got a 4 Ah 12 V lead acid battery which currently runs a Raspberry PI. I'd like to connect a diaphragm pump to this battery as well. The pump has a max. rating of 2 A. Assuming a fully charged ...
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1answer
92 views

Solar charge set up damaging battery?

I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
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2answers
318 views

What is the lowest voltage a 12V lead-acid battery in a car could be?

I'm trying to design a product that is powered from the 12V rail inside the car. In normal driving (engine running, electronics on etc.), what would be the minimum voltage of a low battery? Reading ...
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2answers
58 views

How can I get this 12v motor to run smoothly, and is it set up safely?

This is my first attempt at electrical engineering, so I'm sorry if this question seems basic, I couldn't seem to find answers anywhere. I want to wire a 12v motor to an on/off switch and power with ...
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1answer
121 views

12v DC brushless PWM fan burnt out via Arduino Uno

I’m working on a project where I want to control the speed of a fan using a microprocessor. I read several posts about using an Arduino Uno to control the PWM function on a 4 pin fan you find in PCs, ...
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2answers
70 views

Limiting current to a LiPo battery [closed]

(Updated: Amended text. The smaller battery is a lower voltage than I originally thought.) I have a small 7.5V LiPo battery that needs a top-up charge of max (say) 500mA from a large 12V LiPo battery....
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6answers
170 views

AND gate - 4 inputs, 12V

I want to make multiple AND gate input device. I have 4 locks (3 wires each; common, lock and unlock state) I want to monitor those states from locks and connect them to inputs (IC inputs) so when I ...
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0answers
70 views

How can I achieve 5V DC from 230V AC wirelessly? [duplicate]

I want to step down 230VAC so that I can have a large amount of current that I can transmit wirelessly through the transmitter coil to the receiver coil. I want to transmit it across 5millimetres ...
3
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0answers
116 views

How can i transfer 12 V, 50 Hz, 1 A wirelessly? [closed]

I want to transfer electical power wirelessly from a transmitter to a receiver coil. Input energy is provided by a single phase step-down transformer - 230V/12V AC, 50 Hz, 1,000 mA. Using the 12 V ...
2
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2answers
83 views

Best practices on splitting 12 V 20 amp supply into 5 devices?

I am running a 48 V to 12 V converter rated for up to 60 A on my custom pedicab setup. I'm fairly new at all things electrical and want to get this right. I have five different devices that hopefully ...
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1answer
79 views

12 V pulses with 100 MHz repetition rate

I have to control an high impedance load (> 25 MΩ) with 12 V pulses with maximum 5 ns of width and a repetition rate of 100 MHz. I can generate the pulses with the required shape using an FPGA ...
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1answer
37 views

Powering same LED strip from 2 drivers - diode?

So I'm looking at adding some LED mood lighting to our bedroom. End game is to have a single LED strip controlled by 2 different switches Currently, I have 2 switched 240V AC outlets, one either side ...
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0answers
51 views

12v power supply not putting out right voltage

Built a 12v power supply for music project. The "music from outer space" bipolar design, and my modules connected aint been working right. Tested the power output with multimeter and got 10v with a 1 ...
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1answer
54 views

Make ground signal last longer?

I'm trying to figure out a way to make a ground signal last longer on my car. I'll explain what is happening and what needs to be done. I'm hooking up an factory alarm on my car. It uses a negative ...
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0answers
41 views

Bypassing 110v power-supply on LED light-strip?

I am wanting to use 2 16.4ft rolls of multicolor LED strips in my enclosed trailer for lighting. They come with 110v power supply that plugs into another coverter that the LED lights plug into. Is ...
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0answers
30 views

Switching between two connections - adding LEDs to car reversing light circuit

I am doing a DIY project on my car and need some help. I have 2 LED COB on the back of the car, which is to be used for 2 different things: If I put the car into reverse gear, then the LED comes on ...
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1answer
46 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
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1answer
46 views

Increase voltage drop required to saturate PNP BJT to avoid noise

I have this circuit which must signal +3.3V or 0V depending on the switch status. The the switch is about 20 meters away and is getting EMI from mains. I realized that it only takes -0.7V of ...
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0answers
28 views

How to control single 12V LED with 3,3v GPIO? [duplicate]

Heyo! I need to control single 12V LED using Raspberry's GPIO To be more exact, I need to connect 12V LED & push button to 3.3v GPIO in order to control LED (on/off) and read button push events. ...
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1answer
28 views

Directly Using a Smart Charger with An Old Vector Hunting Spotlight? [closed]

I have an old hunting spotlight (http://documents.dewalt.com/documents/English/Instruction%20Manual/Vector/VEC184POB.pdf) which has a small 12V sealed lead-acid battery. The chargers that come with ...
0
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1answer
78 views

built in charge controllers take amps they need?

Many devices have built in charge controllers that stop charging when battery is at 100%. I read several places that you can charge devices with the manufacturers recommended voltage and that higher ...
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2answers
59 views

Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
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2answers
45 views

Connecting two wires to a DC 12v port on a controller board with 4 pads for a monitor

Sorry, the question was difficult to word. Basically I recently bought a controller board for a monitor and the DC cable I got wasn't correct. So until I get the right part, I just want to test the ...
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0answers
63 views

Charge a 12V marine/boat battery with AC

need to build a diode bridge to recharge a battery (car/boat type) from a boat engine that gives 12V AC. I thought of doing something like this: simulate this circuit – Schematic created using ...
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3answers
110 views

How is the fuse amp rating determined for a 12V AGM battery bank?

I would like to put 3 x 130Ah AGM batteries in parallel and attach a fuse to the positive terminal of each battery. What size fuse should I use? How is the amp rating of the fuse determined? The ...
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2answers
80 views

Is it appropriate to use the TB6621 or DRV8871 motor driver for powering 12V 1 amp motors?

I'm looking to make an Arduino powered rock crawler with 4 motors (want independent control of each wheel, also need to reverse). I'm looking into buying 12V DC motors that seem to have about a 1A ...
0
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1answer
332 views

Powering a radiator fan with 12V DC power supply

I want to run an old VW Fox's radiator fan on a 12V DC power supply. I have managed to burn out two of the PSUs so far. They work for a while but after a while they start overheating and die. I am ...
2
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2answers
98 views

Measuring the resistance of USB car chargers

I have a few USB chargers that are powered through a 12 V car receptacle. I measured their resistance with a multimeter, applying the probes to the contacts of the 12 V input. One of the chargers had ...
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0answers
41 views

Do I need a cut off circuit for my battery

Do I really need an auto cut off circuit for my battery when my charger only outputs 13V and 1A at max. The battery I want to charge is a 12V 7Ah Sealed Lead Acid. I heard that the cut off for lead ...
0
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2answers
58 views

Isolated DC/DC converter application circuit / usage

I'm trying to find a basic application circuit schematic for an isolated DC/DC converter – this one specifically: DCWN03E-12 – but I'm having no luck so far. The thing that led me to this particular ...
2
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3answers
70 views

would like to verify a filter design I need to make for a backup camera in my truck

I am installing a backup camera in my truck. I am getting some source of electrical "noise" in the electrical system in my truck and its not allowing the backup camera to operate. Let me explain a ...