Questions tagged [12v]

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12 V, 7 Ah equivalent transformer

I am trying to power a maglock. The specs say its current draw is 12 V, 500 mA. It works fine when powered by a 12V battery (Mighty Max ML7-12). However, it doesn't work when powered by a 12 VDC, 2A ...
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-1 votes
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How can I step up the voltage signal from a Raspberry Pi to a 12V relay using an LM358 op amp? [closed]

How can I step up voltage signal from a Raspberry Pi to a 12V relay using an LM358 op amp. I also have an external 12V power supply.
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1 answer
31 views

How to use TVS diode for Overvoltage Protection while powering Arduino on Vin Pin?

I am trying to make a protection circuit for Arduino nano to protecting overvoltage. Normally if I powering "Clone" arduino NANO with 12 Volt, Arduino nano is starting to smoke. So I've ...
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3 votes
2 answers
61 views

DC 12V automatic power transfer system to supply Wi-Fi and ONU

I'm from Ukraine, so there are very few options to test something and get support. I need to power my Wi-Fi router and fiber optic modem when utility is down. It is available 4 hours by four down. Wi-...
0 votes
4 answers
134 views

Relay gets extremely hot

I have to programmatically switch a 50 W load (20 V, 2.5 A) and I'm using a Bosch DC relay to do it (exact part is pictured; see page 6 of the datasheet). When I apply 12 VDC the relay clicks, so ...
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1 vote
2 answers
66 views

Burnt out 12 V switch?

I am trying to get a tailgate release button to work on my pickup truck. The problem I have is the switch burnt out. Am I running too much current through it? I have attached a picture of what my ...
-2 votes
1 answer
65 views

Why is this 2 pin 12V mechanical flasher relay on continuously instead of flashing?

+12V is connected to the B terminal, and one end of a regular bulb is connected to the L terminal, and other end of the bulb is grounded, butthe bulb does not blink at all. It is continuously on. What ...
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4 votes
2 answers
668 views

Relay buzzes because voltage increases to 12 V over time rather than immediately

I'm trying to fit an internal light to a campervan that switches on when the current internal lights that are are factory fitted come on. I'm trying to use a relay for this so that when the factory ...
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0 answers
52 views

Converting vehicle instrument cluster lights to LEDs: one light stays on

I have a 1998 K1500 (GMT-400) and I would like to convert the lighting in the instrument cluster to LEDs. There is a semi-known issue with this type of vehicle, where if an LED light is used for the ...
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1 answer
92 views

Maximize heat from a 12 V, 100 W solar panel and 26 AWG nichrome wire

I am heating a nonconducting material. The power source is connected directly to 12 guage copper wire. One 30 inch strand of 26 AWG nichrome 80 wire runs between the copper wire posts. Since sunlight ...
2 votes
2 answers
103 views

Powering long LED strip, injecting power. Correct way to fuse?

Recently I asked an opinion based question regarding LED strips. I have learned my lesson and now I have an actual question regarding "how power flows". I'll explain: I have a lighting ...
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1 answer
84 views

Get 12 V stable output from solar connected 12 V battery

I have a 12 V monitor on my sailboat that only accepts a 5% voltage difference, so it needs between 11.4 V and 12.6 V input. Max draw is 1.5 amp according to spec. Here is a link to the user manual: ...
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0 answers
32 views

Sparking when touching terminal on valve

In an effort to protect my relay I have added a diode for flyback protection. However when I touch the second terminal with power from the circuit I see a small spark. The source voltage is 12 volts, ...
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2 votes
2 answers
95 views

Control AC load via relay with DC trigger?

The headlight of my motorcycle is AC powered via stator. I want to switch between Hi/Low beam using a single pole double throw (SPDT) NC relay. Power to pin 30 (AC) Ground to pin 85 (?) Trigger to pin ...
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2 answers
57 views

Load independent LED flasher DIY advice

I found a product that does something very similar to what I'm trying to DIY. The product purposefully combines a load independent digital flasher relay and electronic push-button controls. Depending ...
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2 answers
73 views

Low voltage connector identification?

Can anyone identify the female and male connectors in the picture? Thanks Here are some more pics Thank you. 1.56mm from pin to pin. So it should be a JST 1.25mm 2 pin micro?
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0 answers
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Identification of polarized 2-pin connector used for low voltage lighting

I am currently working on some outdoor low voltage wiring/lighting for our house. I received some NOS high quality fixtures that I hope to use IF I can figure out what connector this is on the end of ...
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0 answers
60 views

12V boat lead acid battery suddenly failed

Battery on boat and powered by solar panels started acting really weird suddenly exactly a week ago. App shows voltage went from minimum 12.3V to min 6V in a day. On board voltmeter showing 11.9-12.2 ...
1 vote
3 answers
236 views

12V DC motor takes substantial amount of current when the direction is reversed

I am working on an underwater ROV. I am running four 12V DC motors using an Arduino Uno and four N-type logic level MOSFETs to control the speed of each motor individually. There are also four 12V ...
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1 vote
1 answer
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Can I power a router that requires 12V-DC via a 5,5mm input by using a powerbank that can output 12V DC over USB [closed]

I have a powerbank that can output 5V-3A/9V-2A/12V-1,5A over USB. The router I would like to power came with a 12V-1A adapter and uses less than 12W. If I were to buy a USB to 5,5mm adapter cable, ...
0 votes
2 answers
76 views

How to test if current reading functionality on multimeter is working

I have a new multimeter that I've tested the voltage of a 12v flooded lead acid battery with before. Today I tried to test the amps running on the battery, to see if there was parasitic draw. As ...
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3 answers
1k views

Is it acceptable to connect a car battery and an AGM battery in parallel?

I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
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3 answers
209 views

Is 3 amperes at 5V drawing the same power as 3 amperes at 12V?

I know that amperes are volts x watts. If I draw 5V at 3 amperes, is it almost the same as drawing 12V at 3 amperes from a 12V system? I expect the 5V would draw more as there is inefficiency when ...
0 votes
2 answers
92 views

How to regulate voltage from marine battery? [closed]

I have a telescope with a number of components that run on 12vdc. I want to create some sort of power regulator to supply power to my components without frying anything. Is there some kind of voltage ...
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1 answer
63 views

What type of circuit/components are needed to make a phone charger that stops charging when the battery is full?

I'm building my own portable power station, using a 12v lead acid battery as a power source. Currently I've got 1 12v socket and 2 usb ports on it. The idea being to use it to power something like a ...
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0 votes
2 answers
68 views

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 ...
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1 vote
1 answer
149 views

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 ...
1 vote
1 answer
78 views

Switching ATX PSU with a NPN transistor controlled by a 12V signal

I searched everywhere but I can't find a circuit to turn on a PSU with a 12V signal. I know that PS_ON has an internal pullup but its value may change by vendor. So I don't know if I can use this ...
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0 votes
1 answer
218 views

Step down buck converter - lower input voltage than output - LM2596

I want to power 5v leds from a 12v source in my car using a "DC-DC Adjustable Step-down Buck Converter LM2596 3A". The source has a dimmer switch which can regulate the voltage from 12v to 1....
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2 votes
2 answers
68 views

12 V initial to lower voltage continuous step-down circuit

How do I design a step-down circuit that hits 12 V initially, but then drops the voltage for continuous use until turned off? I have a line lock solenoid that requires 12 V to activate. The ...
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2 votes
1 answer
120 views

How to get a steady 12 V output from 12-15 V source?

I am working on a project with a variable voltage input 12 - 14.6 V. I need a constant 12 V output to power some 12 V LED strips. I’m running this through a home automation board and will be ...
1 vote
1 answer
102 views

Replacing 12V 19AH lead acid battery with 12V lifepo4

I have a Stanley PPRH7DS battery charger that came originally with a 12V 19AH lead acid battery. This battery has since given up the ghost and I am looking to replace it. Last summer I constructed a ...
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0 votes
1 answer
111 views

Grounding microcontrollers, signal and logic level wires in a vehicle with buck converters

I sketched out my main installation in my project vehicle. To summarize, it runs with isolated DC converters, one gets the input from main battery (standard 12V lead acid) and converts it to clean ...
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0 votes
1 answer
139 views

Running and grounding paired shielded cable thru a connector

I need to run two logic signals around a vehicle, so for good measure, regardless if its overkill or not, I want to use a shielded single pair wire for that job. At one point it should be crimped to ...
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0 votes
1 answer
50 views

Grounding sensitive devices (ICs, logic level switches) in a vehicle (generator and battery) environment

In my project vehicle I will be using a buck converter that can take from 9 to 18V and output clean 12V. I will also need smaller regulators (12v to 5v) for couple of microcontrollers. I've heard ...
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1 vote
0 answers
49 views

Adding 12V power supply to existing Solar MPPT load circuit

I have a camper which has a small 12v power system consisting of a 50w solar panel, a generic 20ah LiFeP04 battery, an a 15A Victron MPPT controller whose 12v load output feeds directly to a fuse ...
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-2 votes
2 answers
887 views

Can I run a 6V lamp on 12V without damage? [closed]

I am modifying LED headlamps and the LED chips inside says 6V and 2W. However. It came with a pack of two 18650 batteries so it gets 8.4V max when they're full and 7.2 when those are going empty. So ...
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1 answer
114 views

Would this cause a dead short?

I am attempting to install an oil pressure sensor / sender unit for an automotive application. My concern is with adding a relay to make the internally triggered NO switched contact inside the sensor ...
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0 votes
1 answer
64 views

5 V radio on 12 V battery [duplicate]

I am working on a powerbox project (12 V): charging a cell phone, lights, banana plugs and a small radio. 12 V is somewhat straightforward for me. The radio (https://rb.gy/e6ngmo) works with 3 V to 5 ...
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0 votes
0 answers
62 views

Car Head Unit, relay, 12V

Given: a Head Unit that starts with a signal of voltage 12V, Relay Prowest 4120-1C-DC12V (12VDC, 1C, 40A / 14VDC) for switching the cigarette lighter, 12 volts from emergency button light :-), 12 ...
0 votes
1 answer
50 views

Providing precise 12Vdc and 5A (approx) in a vehicle [closed]

I need to have a relatively high amp (5A or close) source in a vehicle, as clean as possible, at a constant 12Vdc without big bumps or fluctuations. I know the regulator does the job by default, but ...
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1 vote
1 answer
66 views

Special project elevator floor lamp

I am building a floor lamp made of vintage elevator directional lenses removed from an old hospital. The lenses are from the 50's. I want to simulate an elevator theme for this project. I have all ...
1 vote
2 answers
173 views

Controlling relays with logic gates

Pretty new to electrical engineering world, so probably rather simple question. I´m designing control system for tractor trailer hydraulic system. The system is 12 V and solenoids what I am using ...
1 vote
1 answer
91 views

Peltier not cooling

I am looking for a little help as I am trying to make a small Peltier cooler and having a little trouble. FYI I have very little idea on what I am doing just got an idea off of youtube and gave it a ...
2 votes
2 answers
960 views

Making 12 V lights fade in using Raspberry Pi Pico PWM

I have 4 small LED lights (raptor lights for a RAV4 grille) for my vehicle and I thought it would be cool if when I start my car, the outer lights would fade in, and then the inner lights would fade ...
1 vote
2 answers
2k views

Why does my inverter keep tripping?

I'm doing a self build camper at the moment and have been setting up the electrics. Everything seems to be working well so far however I've been having some issues with my inverter. I have two lithium ...
1 vote
1 answer
182 views

DC Power Relay 12V inrush Current

I have a question regarding 12v dc relay circuit design. About 350mA flows through the relay coil from the 12v power supply, so the pmosfet specification was selected as vds -30v, id -2A class. The ...
0 votes
1 answer
126 views

5v to charge a 12 V battery pack (possible with this?)

Is it possible to charge a 12 V battery pack with a 5 V charger (say USB charger)? With the follow conditions... The charger will internally charge cell 1 upto 4.2 V, then switch to cell 2 and charge ...
0 votes
1 answer
91 views

12V power point socket keeps burning out, apparently from power surge

I have a simple solar power setup: 40 watt panel with built-in charge controller (https://www.canadiantire.ca/en/pdp/coleman-40w-folding-solar-panel-0112043p.0112043.html) 12V marine battery (https://...
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0 votes
2 answers
154 views

Cheap voltmeter / ammeter installed to vehicle - common ground?

I have a cheap Chinese voltmeter / ammeter like the one shown below. I plan to install various 12V devices installed into my van, such as a 12V audio amp, LED strips, USB chargers, buck converters for ...
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