Questions tagged [12v]

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Log potentiometer, rheostat, or something else for this 180 watt 2.1 PC speaker system? [closed]

I acquired an Acoustic Authority A-3780 2.1 PC speaker system with stand alone amplified subwoofer enclosure that you attach 2 satellites to. Unfortunately, it was given to me without the mini-DIN ...
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-4 votes
0 answers
44 views

Explain about 12V heating elements [closed]

How can I design a 12V electric stove element? What length do I need? Which element should I take? What length should I get? How much current will it take?
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2 votes
2 answers
51 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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1 vote
0 answers
36 views

Charging of 12V auxiliary Battery on an Electric Vehicle with Traction Voltage of 400V [closed]

I have an Electric Vehicle high voltage system designed. However, I need to figure out a way to charge the 12V Battery. I do have a 400V/12V Dc/Dc converter, which powers the Low voltage auxiliary and ...
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0 votes
2 answers
48 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
69 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
44 views

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 votes
0 answers
56 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 ...
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0 votes
3 answers
93 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 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, ...
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0 votes
2 answers
62 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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0 votes
3 answers
111 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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-1 votes
3 answers
165 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 ...
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0 votes
2 answers
76 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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0 votes
1 answer
59 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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2 answers
64 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
62 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 ...
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1 vote
1 answer
48 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
107 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
65 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
114 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 ...
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1 vote
1 answer
66 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
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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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  • 43
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1 answer
81 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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  • 43
0 votes
1 answer
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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
41 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
280 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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0 votes
1 answer
98 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
63 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 answers
55 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 ...
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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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  • 43
1 vote
1 answer
60 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 ...
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1 vote
2 answers
112 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 ...
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1 vote
1 answer
69 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 ...
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2 votes
2 answers
549 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 ...
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0 votes
2 answers
916 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 ...
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1 vote
1 answer
109 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 ...
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0 votes
1 answer
63 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 ...
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0 votes
1 answer
71 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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  • 103
0 votes
2 answers
110 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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0 votes
2 answers
345 views

Playstation 2 - Power Supply 12V pins

I have a 110V Playstation 2 which I've been using for more than 10 years with the help of a 220v to 110v step down adapter. But the problem is that the step down adapter has gone bust and the ones ...
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0 votes
1 answer
86 views

Adapting a 12V Dell power supply to a Lenovo PC - very naive questions

I bought on Amazon a chinese power supply for my Dell Latitude. It plugs into a 12V socket on my car and feeds 19.5V to the PC. So far, so good. Now I want to feed another computer, a Lenovo thinkpad ...
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0 votes
0 answers
150 views

What power supply to use for Arduino Nano + NEMA 17 motor?

I am making a small project in which I am trying to drive a NEMA 17 stepper motor (1.5 A per phase, I would use it in fullstep mode probably) using an Arduino Nano and an A4988 stepper motor driver. I ...
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3 votes
4 answers
656 views

How to convert leds from AA batteries to a DC source

I have 2 strings of 100 white LEDs each that are powered by a battery pack of 3 AA batteries for each string. What I would like to do is use one of my low voltage power supplies that are typically ...
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0 answers
56 views

Voltage/Ampere switch

I have 12 V DC solar pump. Since solar gives a variable power, I need an automatic solution to switch on the pump when the output reaches 12 V/1 A. Is there any way to do that?
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1 vote
2 answers
406 views

Help with a RS232 (+-12 Volts) to USB converter [closed]

I have a device I want to communicate to with the following signals: This is a programmable power supply, an IPS-405. I have determined from the image above, which is all that is available in the ...
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  • 13
0 votes
2 answers
268 views

Limit current drain from 12v7Ah Sealed Lead Acid Battery

I have a 12V 7Ah SLA battery which i use with my DC Fan motor (not sure about its voltage and current requirements may be between 12v to 18v). I use it with both battery and wall charger (non branded)....
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0 votes
0 answers
34 views

Buck converter remote terminal

I'm testing a LED setup, I have a bench PSU going to Traco 5V buck converter that feeds 10 LEDs (SK6812). When I power the bench PSU on, before it hits 12V, the first LED in the strip flashes for a ...
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  • 43
0 votes
1 answer
205 views

24V optocoupler with 12V?

I recently picked up a "24V Voltage Level Current Converter Module 80KHz 1-Channel Optocoupler Photoelectric Optoisolator 12V PNP NPN Signal Converter PC817 Optocoupler" Can I supply this ...
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1 vote
2 answers
184 views

How to cheaply build a latching relay system to disable a circuit until power is cycled?

This is my first post here. I have an aftermarket backup sensor that needs to be disabled when I back a trailer. I want to be able to push a button to disable it, but have it be automatically re-...
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