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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Step down transformer alternatives

Does anyone know if I can use a Quam TBL 25 volt 4 watt audio transformer to step down 120 volts to 12 volts, later to be rectified to a 12 volt dc power supply? I know 12 volt power supplys are ...
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82 views

How to make a continuous current from a flashing source?

I have a machine running, when a problem occurs, it stops and sends a 12VDC light bulb flashing every second or so, how can I get a constant signal from it to use this signal in the VFD to perform a ...
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26 views

24v from 2x 12v DC power supply?

I have a box full of 1-6amp 12v power supply and 1 short run of 24v led strip, rated about 1.5amp draw at full blast. Can I take 2x 2A 12v supplies (ungrounded plug) to run in series to easily ...
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Can i step up a usb power oulet in my RV to power my cellular signal booster?

I have an RV with a 12V power system that has usb outlets to provide power for small devices. I have a cellular signal booster that I want to power off one of the usb outlets. The power cord is ...
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1answer
40 views

Reversing the input of a transistor

I want to detect if a 12V DC line has power or not. I want the transistor to work like this: If pin 2 has 5-12V, pin 1 and 3 should be disconnected and should stop the flow of 5V 2A across pin 1 and 3....
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56 views

What is the power consumption of a 12V adapter running 4 CPU fans?

I have a quick question here. I am not a ECE guy and just a hobbyist trying to tinker while quarantined. I have 4 CPU fans (120mm) laying around and I'm trying to re-purpose them as a small fan. ...
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1answer
26 views

12 V DC Li battery voltage regulation question

I recently bought a 12 V 50 Ah Li battery with the intent to use it for a 12 V DC trolling motor for a boat. The trolling motor runs at up to 30 A. I have read that lithium batteries tend to output ...
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1answer
25 views

Can I run 12V camper van fridge whilst 'trickle charging' the battery in van?

I am running the following setup in my camper van and would like to know if there is a simple solution or device that would be effective in allowing me to run my 12V fridge whilst the leisure battery ...
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2answers
50 views

Wiring 12V lights with shared wires

currently I'm wiring my converted RV. I've a 12V system and want to connect 12V LED lights. I don't want to use RV or rocker switches. I bought standard house light switches. After a lot of research I ...
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2answers
75 views

Can 12V relay be used instead of 5V relays?

I have the project of making a touch switch using the IRFZ44N MOSFET for making a small led glow and stop glowing when I touch the probes. I thought of using a relay if I have to make a bulb glow, by ...
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Getting loud whine on dual 12v 80 watt DC Universal radiator fans, especially in reverse

In an effort to create airflow in my studio that has the only window facing a sealed alley, I swapped the AC fans from the useless Holmes dual window fan and replaced them with two 10-inch 12V DC 80-...
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1answer
51 views

How do I wire up a 2.3-3 V LED to a 12 V car battery that can have a variable voltage depending if the engine is running or not?

I am making a wireless switch for my car tyre inflator. I have a basic hand-drawn sketch of what I intend to wire up. Basically, it will be a box with an 50 amp Anderson plug for input (right hand ...
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1answer
72 views

Is a short circutied battery (I believe) worth anything? [closed]

While trying to install 2 Duracell Ultra 12V 46Ah AGM batteries to power a trolling motor in a boat, I accidentally connected my wrench from the positive of one battery to the negative of the other. ...
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45 views

Battery management for 12-24V motors

We have 4 12-24V motors which we want to connect to a 14,8V battery. Two of the motors are position controlled (M3 and M4, see figure) and will not draw much current as they will mainly be stationary. ...
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1answer
62 views

Connecting Three 12V DC Water pumps to the same power source

I am new to all this and I am sure this is a very basic question, but wanted to ask before I fry some pumps up. I have a relay, which is controlled by my raspberry pi, switching the pump on and off. ...
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36 views

Calculation of max possible current load from voltage multiplier connected to PSU 12V rail [closed]

today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
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1answer
51 views

How to correctly supply power to multiple 12v devices wired in parallel?

I am an artist, building a functional miniature which contains multiple devices (3 12v computer fans, 1 cooling pump, two led strips totalling 14 segments of three or 42 individual lights, and 1 ...
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44 views

Which relay would be better to use in IoT switch for industrial and home purpose, 5V or 12v?

We are designing a IoT switch for controlling industrial and home switches and we are not sure what relay should we be using, 5V or 12V. Please let me know which one would be the best to use.
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43 views

Using 12v 50w motorcycle light with two 7.4v RC batteries

I recently purchased two motorcycle lights (12v DC 50w) and only needed one. Now I have some 7.4v 4500mah 45c batteries leftover from my RC hobby a while back. I would like to create a 3d printed ...
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1answer
171 views

How can I stop my relay chattering as the voltage falls?

I'm powering a relay from a 12v power source, however this source does not immediately turn off, rather falls gradually for a 'fade' rather than straight off. Unfortunately this makes my relay ...
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0answers
94 views

How to connect a 12V battery to a 24V system?

I have a 24V battery (two 12V lead/acid in series) connected to solar panels and I'm looking for a way to have a 12V battery and circuit. (But the solar array will charge the 24V system so i need the ...
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2answers
119 views

Why is 12V Common for PSU

Looking around at various PSUs and I see 12VDC show up pretty commonly, both for PSUs and motors they drive. Can anyone tell me some of the history and/or rationale behind this? E.g. is that a ...
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4answers
172 views

Why do my all Atmega328P chips stop responding suddenly in a 12v circuit with Zener diode?

I have noticed this strange thing where my atmega328p stops working and when checked through Arduino IDE or AvrdudeSS or ProgISP, they show programmer not in sync, rc=-1 initialization error (while ...
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1answer
52 views

800 A 12 V bank Winston LiPo4 fuse size?

Installing this bank, with about 1 meter to my inverter/charger, but I want to add a fuse on the positive side. The inverter is a Victron 3kW. The charger is 120 A. The cables that I have now are ...
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1answer
83 views

What is happening when I apply 5V DC to the DC end of a 12V AC to DC adapter? [closed]

The question is in itself a little bit confusing but I will try my best. So I have a normal 12 volt (1 amp) AC to DC wall charger, nothing fancy about it. I use that to power a fan, which works great ...
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1answer
53 views

Low voltage switch (12v)

I am looking to build a circuit that will control a 120v battery charger through a relay, the circuit should turn the relay on when the battery goes below 11 volts and turn off the relay when it gos ...
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0answers
76 views

EPS12V 8pin from ATX PSU with two separate 12V rails

This is your standard EPS/ATX12V connector used for feeding the main processor VRM on a computer motherboard. The two 4pin connectors can be attached together to create an 8pin connector. The top four ...
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24 views

How to get max V output from XBox360 power supply

I have a few Xbox 360 power supplys laying around and want to repurpose for led light project I am working on. The rated output is 12V 16.5A and thats perfect for my needs Problem is how do I get ...
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1answer
81 views

Using 2 5V pins to get 10V [duplicate]

I want to to my RaspBerry Pi 4 with an old small CPU fan. However it's a 12V fan. Is it possible to use 2 of the 5V pins on the board to total to 10V? Sorry if this is a dumb question. I haven't ...
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1answer
35 views

Approrpiate Guage wire for 12v 1amp power supply?

I am looking to power a Wineguard 12v Antenna Amplifier off a pc power supply. However I am wondering what gauge wire is right. The run will be about 4 feet total (2 ft each direction) at 12v with a ...
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52 views

12V Pump power supply

I have a 12V pump that will run at 13 amps. I will be controlling it with a float switch and a relay. I have sound several power supplies at reasonable costs that will provide enough current to run ...
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2answers
189 views

How to amplify a 0-5V PWM Signal to 0-12V, 10A

I need a Power amplifier which amplifies a 0-5V Arduino-generated PWM Signal to a 0-12V Signal with 120W, for powering a ZVS induction heater. Linearity is not important because i can correct the ...
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3answers
107 views

powerbank 12v to kinect sensor v2

I have very little knowledge about power draw / conversions etc. I would like to power a Kinect v2 Sensor from a USB Power bank. I saw the USB C and QC3.0 on this powerbank has between 9 and 12V ...
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1answer
68 views

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 ...
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0answers
36 views

12v ride on toy car tripping breaker under normal load

After sitting idle in the garage for a few weeks, my daughters ride on toy car wouldn't move. Changing the battery with a relatively new one did not help. I tracked the problem down to the shifter (...
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1answer
42 views

Parking Light And Signal light with same LED using MOSFETS

I have a project where I have an existing 12v parking light and I want to also have the turn signal use the same light. I've constructed a circuit using 2x NMOS and 1x PMOS. I think it will work and ...
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1answer
50 views

Get signal from apartment intercom to know when someone ring

In my apartment I have an old intercom to know when someone is at the entrance of the building and to unlock the door. I waned to connect it to an esp8266 to let me know remotely if someone ring and ...
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1answer
171 views

Polarities of high current bypass, and short circuit protection, transistors on LM7912 - NPN or PNP?

With reference to Olin's answer to Connecting Voltage Regulators 7812 in Parallel for High Current, and likewise the examples from the Fairchild, TI and ST datasheets, a PNP transistor is used (i.e. ...
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1answer
87 views

What is the correct wire size to run to a 12V 1.5 amp window blinds motor that is 47 feet from the DC transformer?

I read somewhere that an 18/2 wire could be used to connect a transformer to my window blinds motor (12V 1.5 amps). However, it didn't say anything about the distance. Since I am running it inside ...
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1answer
66 views

Use one 12V 30A timer for two separate 12V inputs? [closed]

I'd like to use the following timer, rated 12V 30A, but for switching two different 12V inputs at the same time and not having to buy and program two timers. But the timer only have one channel. One ...
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1answer
79 views

2n2222 with 12v 8mA [closed]

I have a circuit running on 12v 8mA and I want to get a signal to a GPIO of an esp8266 when current is running. So for that I tried to use a 2N2222 transistor with vcc of the circuit going to the base ...
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1answer
39 views

Wiring 4+ 12v led ring switches from one 12v supply

I am new to electronics and general electronic circuits. I have 4+ led ring switches (from here: follow link) The website says that the rating of the switch contacts is 5A 250VAC with an ...
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1answer
54 views

Powering high-power laptop from DC without inverter

Context: We live full-time in an RV (a travel trailer) while traveling around the US. We have 300Ah of 12V Lithium batteries, a 3,000W inverter and 600W of solar. Although we have an inverter, it has ...
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1answer
49 views

Dupont jump wire in order to replace 20 pin cable

Hello, I bought a mp5 player for my car and I didn't find the 20 pin cable for this player. My question is if I could replace it by Dupont jumper wires as the picture shows
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121 views

12V voltage regulator

simulate this circuit – Schematic created using CircuitLab I have bought the LM78H12K 12V voltage regulator, for the 12V output. My input voltage is 17 V DC, but unfortunately this component is ...
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2answers
53 views

Case Fans in DC

I need to run about 15 12V case fans(80mm) from wall power. How do I do that? How much amperage do I need? Which voltage adaptor do I buy? I have searched this site and many other sites such as this ...
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0answers
66 views

Boost 12v battery cranking amps with supercaps

I have a setup where a 12V AGM battery is powering an inverter. This inverter, for brief periods (1 or 2 seconds - compressor starting) needs more amps than the battery can provide. Is there a ...
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2answers
114 views

Powering WS2812b 12V

I have an idea to use WS2812B as animating light on some old equipment. And I have some doubt. The equipment is 12v so I want to use WS2812B directly on 12V, namely I want to use 5 WS2812b in ...
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1answer
104 views

Confusion regarding a 12V DC motor's RPM

I have a 550 DC motor of 12V, 45W and 10K RPM installed on a wheel, which is not causing the wheel to turn fast enough when the motor is connected to a 12V battery. I replaced the motor with an older ...
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1answer
51 views

Create circuit for 12v auto washer pump to 230v mains with push button for art installation

I am creating an interactive art installation in a gallery context using a 12 volts car headlight/windshield washer pump. It basically is a fluid washer pump taken outside of a car into a gallery, ...

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