Questions tagged [voltage]

Voltage is the measure of electrical current. This tag should only be used when asking questions related to powering computers and peripheral equipment. It is not for asking about voltage issues related to the commercial supply of power to your home or office.

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54 views

Powering my laptop from DC to DC converter?

I use my laptop Lenovo Y700 on solar system, but much energy is wasted when converting DC power to AC and then back to DC. So I bought a 12V DC to 20V DC converter. Is it safe? Or may it damage my ...
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65 views

Can I use a smart socket with an input voltage of AC 120V and plug it into a 220V outlet?

Using a Smart Socket Model SP10 Made by Teckin It's meant for use in the USA with 120V power outlets but it is being used in the Phillipines with 220V power outlets.
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26 views

Liquid spill Keyboard & Mouse = risk for the PC?

Great Monday start with my coffee spilled on my mechanical keyboard and my mouse... I tried soaking up as much as possible but didn’t open them up to see. For the keyboard when I removed the keys and ...
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72 views

low voltage POST only means battery problems?

No doubt the watch battery on the motherboard long since lost its juice. However, I'm not quite sure what error I saw on boot, I think it was before POST and I think it mentioned "low voltage&...
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26 views

Low voltage readings in BIOS and other weird readings

I have an older ASUS H97 Plus mainboard (using an Intel Xeon processor), never updated the bios. Two or three years ago I started getting Surge Protection warnings so I replaced the PSU. Today I ...
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126 views

Can I use a power supply with different input/output voltage for router?

I bought a Verizon g3100 router; it did not come with its external power supply. The needed cord has an input of 105-125v ~ 60Hz 1.5a and output 12v 3.5a. I can't find exact cord anywhere but I ...
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56 views

12v from Notebook Mainboard to attach 3.5 inch HDD

I plan to build a low-budget low-power home server, mainly as a NAS. My first Idea was to simply use a RPI 4, it has USB 3.0 and Gbit Ethernet, but I think the hardware is too slow to be fun. For ...
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44 views

How to replace my power supply safely?

If something is powered from a 9 V and 1 A supply, you can replace it with a 9 V and 1 or more amp supply. How would one calculate if it is safe to replace it with a less voltage and less amperage ...
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278 views

12v line is showing up to 14v in BIOS (DMM reading are fine)

Purely by chance, upon rebooting, in the BIOS, I saw that 12v line was showing 13.9v, although I used the computer normally all day long. After resetting all settings in the BIOS and reboot, nothing ...
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244 views

Laptop charger 19V 6.32A 120W Adapter as replacement for 20V 7.5A 150W [duplicate]

Is it safe to use 19V 6.32A 120W Laptop Charger / Adapter , because I lost my 20V 7.5A 150W adapter and the only one I could find locally is the 19V 6.32A 120W , currently using the laptop for Gaming ...
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Is this RAM overclocking?

I have 2 DDR4 sticks (2x16 GB) running with a 3700X Ryzen CPU with an MSI B450M Mortar Max motherboard: one 2x16 GB Crucial rated at XMP 3200 MHz CL16 18-18-36-72 at 1,35V one 2x16 GB rated at XMP ...
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68 views

Does the voltage supplied to a CPU differ per core?

I'm currently trying to find a range of safe voltages for CPU overclocking. As a start, I looked at the automatic stock voltages: Without any Turbo-functions, the voltages in this case range from 0....
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25 views

Can’t Determine charger is compatible? [duplicate]

The original charger that came with my laptop: input: 100-240v ~ 1.2A 50-60Hz output: 19v 2.37A The new charger that I got: input: 100-240v ~ 2.5A 50-60Hz output: 19.5v 4.62A Will this charger be ...
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49 views

can i power a device with more output amperage than the device needs? [closed]

I just brought a speaker that runs on 12v power supply. So i want use it on my car. Can i power a speaker with a car battery 12v directly? Speaker input: 12V, 1.25A Car battery output: 12V
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3k views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
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665 views

Is it safe to use non-genuine laptop's battery

I own an Hp pro-book 430 G2 Laptop, While I found batteries compatible with this model they weren't exactly the same. My battery is RA04XL while What I found has RA04 written on it. Both batteries Li-...
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59 views

Is it safe to use a different battery

my new battery just arrived, it’s an 44 Wh battery, 2850 mAh while my old one is 40 Wh, 2550 mAh. Is it safe to use it? (Both are 14.8 v) Also, when I installed it I smelled a burn inside my laptop ...
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2answers
71 views

Why does RDIMM-type memory require less voltage from the CPU?

I have read the following: https://www.anandtech.com/show/6068/lrdimms-rdimms-supermicros-latest-twin/2 https://en.wikipedia.org/wiki/Registered_memory https://www.pcmag.com/encyclopedia/term/62658/...
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324 views

Inverter Voltage Output Measurement

I have an old notebook which the backlight is not working. In order to know the reason why, it would be interesting to measure the output voltage 'Vout' from the inverter. Unfortunately, there are ...
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1answer
451 views

Using slightly different voltage battery for my laptop

I’ve an acer laptop (Acer aspire e15) and it’s battery was blown up and doesn’t work anymore. So I ordered a new battery off amazon with correct voltage which was 11.1V as it was written on the ...
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645 views

Can I use different laptop charger- similar Voltage, higher Ampere? [duplicate]

My original laptop charger was output 20V 3.25A. Now I have a charger with output 20V 6.75A. Can I use it? (The real data: Can I charge Lenovo Yoga 11s with Lenovo IdeaPad 15?)
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130 views

Using a step-up converter with PC's PSU to power monitor

Is it a bad idea to use a Pololu U3V70A to step up one of my spare 12v cpu/pci-e connectors on my PC's PSU? The monitor I want to power requires up to 19v/5.79a.
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85 views

PSU voltage and microfreezes

A week ago, my PC started exhibiting a problem. When scrolling in a web browser or trying to game, microfreezes happen randomly. The PSU is five years old, and some of the voltages look out-of-spec, ...
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1answer
99 views

Does Silicon Lottery apply to individual CPU cores/threads compared to the others?

Can individual CPU cores or threads clock faster than the others due to Silicon Lottery? Is it then reasonable that the rest of the cores are held back by the slower one as they need to match it's ...
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78 views

Dell xps 9350 battery voltage issue

I have Dell XPS 9350 model which has battery issue. So I brought another new battery which is not original yet good one. Now my question is My original battery has 7.6v but the other battery which I ...
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1answer
65 views

Using two different chargers for the same laptop

I have laptop HP 650 G1 It came with charger with specs: INPUT 240V - 1.6A 50-60 HZ OUTPUT 19.5 V-3.33 A So I want to know is it safe to charge laptop with another charger (same connector, also from ...
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3answers
8k views

I am in a EU country where it says on the socket 16 A / 250 volt. Can I charge my laptop which takes 100-240 volt / ~1 A?

My laptop started turning off randomly and I thought maybe it's because of this socket.
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1answer
464 views

Can i use a universal laptop charger for +10.8v 4400mah, 47wh [duplicate]

I have a universal laptop adapter with listed voltage that i can set 12v/15v/16/18/19/20/24v.. i want to try it on my asus laptop with battery rating of +10.8v 4400mah, 27wh.. it's an li-ion battery. ...
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81 views

Abnormal voltage range and frequency activity on Intel 8550U

I have recently purchased a secondhand/refurbished HP laptop with i7-8550U CPU and MX 150 GPU. The first thing I noticed is that it runs unreasonably slow on games, much slower than my other i7-8550U +...
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1k views

Using 3.5“ internal HDD connector for a internal 2.5” HDD

I had a 3.5 inch internal HDD, and to connect it externally, I bought a 3.5 inch connector (as 3.5" HDD requires 12V power), which had a chip and external power adaptor - as 3.5 inch HDD can't ...
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1answer
90 views

Powering a Acer netbook using a Lipo battery

Is it possible to power a 10.9v rated Acer Aspire notebook using a 10.9v/3300mah Lipo battery pack via charger port? Charger seems to be 19v. Does Notebook really need 19v to work? I want to use the ...
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127 views

Thermistor to Celsius/Fahrenheit/Kelvin in MATLAB

Thermistor to a Temperature Unit in MATLAB I am using an Analog Read Pin on an Arduino Uno to read the temperature as given by a thermistor. The resistor being used on the thermistor is 220𝝮. What I ...
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1answer
547 views

Choosing the right stabilizer / Voltage Regulator for Laptop Charge carts (40 capacity)

A client has a laptop charge cart rated input @ 125VAC & output also @ 125VAC. Total 1875 Watts. specs: http://www.v7world.com/us/products/charge-carts/charge-cart-30-devices.html#horizontalTab5 ...
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39 views

What do I need (powerwise) to plug my French gamer PC in Canada

I read on metastack that superuser is the place to ask hardware related stuff, hope it fits. I recently move from France to Canada and I'm going to get my gamer PC shipped soon. What will I need to ...
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2answers
326 views

RAM upgrading tips

I am going to increase RAM size by add another DIMM in the 2nd slot of my motherboard. My concern is how to buy RAM online with exact voltage, speed, single or dual channel. Will my mother board ...
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1answer
36 views

USB type C power

I use a USB cable (normal type A male on one end) and type C on the other. I connect the C end to my Samsung tablet and the other end into my DJI Mavic drone remote controller. The connection works, ...
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2answers
5k views

Okay to supply more amps? Use a 14V 4A 56W power adapter on a 14V 3.21A (45W) monitor?

I have a Samsung 4K monitor, LU28E510DS/ZA (Costco exclusive variant), with a back panel describing DC14V 3.21A. I cannot find an exact replacement power supply. I found one that is close at 14V 3A ...
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1answer
13k views

Lenovo Trim Yellow rectangular power adapter

Need Lenovo Yellow Power adapter connector information, its a MYSTERY to me!! Options ‎ Hello all, I recently just purchased my first Lenovo products with the new Yellow rectangular power adapter. ...
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261 views

Laptop charger voltage

I bought a laptop from the US. Now the part that connects from the power brick to the wall socket says 7A 125V. Unfortunately, the end that goes into the wall socket does not fit. So I replaced the ...
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1answer
22k views

USB-C Chargers: Is it safe to charge a phone with a laptop's power supply?

I have an HP Chromebook and a Nexus 6P smartphone, and both of them use USB-C connections for charging. When I plug the Chromebook into the Nexus's charging cable, it works fine and I just get a ...
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1answer
575 views

Increase voltage on PCI serial port

I have many serial based cash drawers. An issue that I continually face with them is firing the latch strongly enough to open the drawer. I believe there is a capacitor that must be charged and if the ...
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2answers
7k views

What are the dangers of high CPU voltage?

I have a i7 6700k Skylake and I have her overclocked at 4.7GHz with 1.7V. I've seen people saying that you should be wary of putting the voltage over 1.5V, but they all seem to be related to core ...
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2answers
27k views

How do I check the mAh or Voltage for my laptop battery?

I was wondering if there's an easy way I could find out the mAh for my laptop battery, It's a Lenovo Yoga 12 and it states on the manufacturers website that the battery is a Li-Polymer 8-cell 47Wh but ...
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2answers
4k views

Why do you have to use a voltage divider with HC-05 bluetooth module? (Arduino) [closed]

I am trying to connect my bluetooth module to my Arduino but it takes 3.3 volts (the bluetooth module HC-05, The Arduino mega takes 5v) and the tutorials online say to connect the RX pin to the Ground ...
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0answers
276 views

Console powers off and powers on in quick succession. Insufficient current? Voltage drop?

I have a question about a specific setup I have. I have a Nintendo Classic Mini console, this console: requires 5V/1A through its USB 2.0 micro-B female connector to power the console outputs ...
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3answers
350 views

Safe to use a 19V 2.15A DC adapter (a laptop charger) for an accessory that uses a 25V 0.75A DC adapter?

I picked up a USB steering wheel at a thrift store and it requires a power supply to 'nudge' the wheel back into place (if you let go of it, for example). It requires 25 Volts, 0.75A, yet the closest ...
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1answer
505 views

Laptop Battery: Can High Voltage Damage?

I am looking to buy a new battery for my Toshiba Satellite L10 But I have a problem. On the website, it says only compatible with 14.4 /14.8 volts, but my computer is 19 volt. Does this matter? Will ...
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1answer
2k views

How to increase laptop/notebook USB voltage?

USB ports typically provide anywhere between 5-6V. If a laptop/notebook USB port is only producing between 4-5V; What can be done to fix (i.e. boost/increase) the output voltage?
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3answers
594 views

Are Kingston DDR3 1333mhz and Crucial DDR3 1600mhz 2GB RAM sticks compatible?

I have 2 crucial sticks in my ASUS P8Z68-V LX atm. I'd like to go to 8GB and wanted to know if the lower voltage Kingston sticks would be compatible? Also I feel I should point out the Kingston RAM ...
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0answers
921 views

Asus M32 desktop motherboard will not power on. Unknown purpose of its “VRM_BOOT” pins

My Asus M32 desktop will not power on after a power outage. The CPU fan does not spin and there is no video output when the power button is pressed. I've used 4 different power supplies to try to get ...