Questions tagged [12v]

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82 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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1answer
55 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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1answer
42 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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0answers
25 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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2answers
113 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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1answer
96 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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1answer
61 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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0answers
48 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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1answer
48 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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1answer
58 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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2answers
90 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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1answer
54 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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1answer
247 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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2answers
246 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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1answer
55 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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1answer
57 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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1answer
61 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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2answers
75 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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2answers
165 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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1answer
54 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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0answers
75 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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4answers
315 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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0answers
54 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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2answers
214 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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2answers
146 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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0answers
32 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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1answer
87 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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2answers
145 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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4answers
253 views

12V pulses into 5V pulses

I have a 12V pulse square signal coming from an RPM sensor. I would like to translate it into 5V pulses since I will need to use it as input in an Arduino. What do you guys think is the easiest way? ...
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1answer
51 views

plug light in without spark? [closed]

I have spotlights which go on 12V/24V distributor but every time I plug one in there is a spark, they still do work fine but it's a bit scary and just annoying when all the other ones flicker every ...
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2answers
121 views

Can I wire a 12V car battery to the 12v cigeratte lighter plug?

I have a van for summer travel and I am considering wiring up a car battery directly off of a 12V cigarette port which is rated at 20A by the car company. If both batteries were well charged at the ...
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1answer
66 views

Use household power strip for 12V/24V power

I have a 12V/24V dimmer (rated 60W) and need to hook up 8 different lights, can I just use a regular power strip to distribute the 12V/24V? the power strip of course says 230V on it, but does it ...
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2answers
376 views

LED with built-in resistor and voltage drop

I accidentally bought 12 V LEDs, so an LED with a built-in resistor (you can see it as a black dot on the anode). Now I measured the voltage and get after the LED still a voltage of 11.3 V, when the ...
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0answers
24 views

LIN bus extender

I have an application where the nodes may be 40m apart and want to make each node a repeater as well as an operating node with a microprocessor (PIC16F1829 say). Am thinking about two MCP2021A back ...
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0answers
43 views

Powering Raspberry Pi from multiple DC voltage sources

I'd like to have some method of powering a Raspberry PI 3b project from a variety of sources, whilst being backed up by a battery: Internal battery Car cigarette lighter Mains (via a DC adapter, like ...
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0answers
49 views

Options to control (fast switch) a 12V LED DC with MCU - mosfets vs. relays vs. SSR vs. mosfet relays vs. something else?

(Newbie alert) I have a 12V 3A light that I want to control in a ~12V DC circuit (lead acid battery, stator coil). The light shares a common ground with every other light unit in the circuit. I was ...
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1answer
104 views

Tachometer air core meter - how does it operate?

This is a question from a total noob, out of pure curiosity. I've been tinkering with my bike's instrument panel and took it apart - I found out that this sin-cos marking is the base of the air core ...
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1answer
179 views

Switching 12V vehicle headlights with Arduino / Mosfet combination

Ground level noob here, started to tinker with electronics at the beginning of this year after I couldn't get any electronics shop in my town replace my bike's gauge cluster SMD LEDs. I learned few ...
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0answers
67 views

Practical understanding of "tapping" into vehicle 12V battery / fusebox for power

Disclaimer: I did "tap in" and hooked things to my battery (on my car) many moons ago and did it without really thinking what am I doing, and I was probably doing it in a very hack/ghetto ...
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1answer
778 views

12v dual battery setup - wiring, grounding and busbars

I am installing a 2nd 12v battery into my van to run eletronic devices. The 2nd battery is a bank of 2x LiFePO4 12v 120Ah connected in parallel. My three questions are surrounding the circuit diagram ...
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0answers
76 views

2N2222 NPN Transistor, no current flowing through collector

I have a 2N2222 NPN Transistor wired up in the most basic common emitter setting (emitter grounded, base hooked up with a 1k resistor to 5V, collector connected to load and load connected to +12V). ...
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2answers
137 views

MOSFET started to smoke when switching a 12V bulb - how can I troubleshoot the cause?

This is the case: 12V bench power supply (current limited to 3A) wired to a 30W LED bulb (H7 bulb for vehicles), controlled by an Arduino via the gate of the 2SK1363. The signal from the Arduino was ...
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1answer
81 views

Wiring two separate circuits with separate loads (one with mosfet and Arduino) with a single bench PSU

I have a cheapo bench PSU with one pair of terminals on it and I am trying to wire the pictured circuit correctly and in best possible practice. As my description on the schematic says, one LED device ...
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3answers
347 views

Running a 12v fridge and protecting the battery from low voltage

I want to run a 12V (65W) fridge from a battery circuit on a boat. However, I want to protect the battery from being drained and potentially damaged by the fridge if the voltage drops too low so I ...
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1answer
232 views

battery low voltage cut off breaker (manually reset)

First off, I am aware that premade devices like this exist however I have been unable to find any that fit my exact needs which are as follows. 0 power draw when in the off state Minimal voltage drop ...
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4answers
245 views

12V LED radial wiring

How do I install the 12V equivalent of a radial/lighting circuit? I am about to renovate a small 40m2 apartment. I do not want to touch the existing 240VAC cabling at all. I am looking to have ...
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2answers
128 views

Switching 12V with Arduino Nano

I am trying to design a circuit to switch 12V 90mA on/off using an Arduino Nano as the trigger. Is there an optocoupler/transistor/MOSFET that can tolerate 12V at 100mA on the load side while still ...
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4answers
462 views

Can I turn on a 12V relay with 5V supply, just by changing a resistor?

I have been trying to run a W1209 module with 5V instead of 12 volts. My application is heating a small component to 70 degrees of Celsius, mostly using a power bank or a mobile charger (Hence the 5V)....
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1answer
77 views

Is this a standard power connector? (from Victron Energy 12V battery charger)

I am trying to find out whether I can buy this connector. I've browsed Victron Energy's manuals/specs and can find no mention of the connector name. Spec sheet PDF Note that one of the corners of the ...
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2answers
311 views

Battery imbalance - two 12v lead-acid 100ah in series

I have just installed two brand new 12v lead-acid batteries in series to for my 24v “house system” on my boat. I connected them to my 24v charger to ensure they were charged to 100%, to synchronise my ...

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