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Questions tagged [pc]

PC stands for a personal computer. It is a general-purpose computer whose size, capabilities and original sale price make it useful for individuals

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What is this 4-pin fan header?

What is the name of this 4-pin fan header, in the first image? This is from an Intel NUC motherboard, and there is 1.0mm between each pin. Will I be able to get and use an adapter for the much more ...
Fred Nurk's user avatar
  • 133
2 votes
1 answer
77 views

My HDMI cable is outputting constant current, is that normal?

I bought two cheap monitors in a local shop. They are basically the same model, and both came with an ungrounded external power supply. After getting a few shocks from the HDMI cable I realized it is ...
Ariel's user avatar
  • 23
0 votes
1 answer
95 views

Are these old graphic controllers all the same die packaged by different manufacturers? [closed]

I am looking at old ISA graphic adapters that would provide a simple black and white text mode. I am trying to make the design as simple as possible and I would like to make the PCB as small as ...
tpimh's user avatar
  • 513
0 votes
0 answers
33 views

Switch setup to power on/off PC

I have a project which contains a PC connected to an Arduino R4. The PC is enclosed in a cabinet and I can't open it (easily) to power it on. Normally I would run a remote wire to the button to power-...
ElectroRag's user avatar
2 votes
1 answer
342 views

What is the proper name of this fan connector?

Does anybody know what the correct name for this fan connector is? The female plug side is "Molex KK 254 Housing with Polarization Rib, 4 pin" https://molex.com/en-us/products/part-detail/...
Alex Moore's user avatar
-1 votes
2 answers
67 views

Can a generator with rated ouput 2.5kW handle 2 PCs rated 600W and 500W connected to two UPS rated 3000VA/1500W and 2000VA/1200W [closed]

I'm having issues with different answers from ChatGPT and Bard. I'm not an expert so I would appreciate an expert opinion. I have a PC rated 600W connected to a UPS rated 2000VA/1200W with a power ...
Sky Tech's user avatar
1 vote
3 answers
948 views

How does a PC switch turn on a PC?

Here is my current level of understanding: virtually every PC case has a switch near the top to power on the PC. When the PC is off, pressing the switch once will power it on and the PC will begin ...
David D.'s user avatar
  • 175
0 votes
4 answers
332 views

Thermal pad to dissipate heat to pc case

My motherboard, at the back of the CPU to be precise, is quite hot. Mine is a X99 with little over clocking. I am thinking if I use a piece of adhesive silicone pad to transfer the heat from the back ...
xxjoe's user avatar
  • 1
1 vote
3 answers
868 views

possible to have an electric arc in PSU? [closed]

I have the following situation: Living in Europe (220V sockets, 50 HZ) My wife came to me and said she tried to start up our sons PC and she heard a short zap, then nothing happened; my son confirmed ...
zozo's user avatar
  • 123
0 votes
1 answer
134 views

A component that acts like a buffer incase of power outage? [closed]

I've had a few self inflicted power outages when too many appliances are connected at once, I got a blue screen on my PC as I had another power outage while booting, I've managed to fix this however I ...
Aden's user avatar
  • 27
4 votes
1 answer
377 views

Streaming 30 MByte/s into a PC using an FT232H?

I want to bring a continuous 30 MByte/s stream of 8-bit values from parallel-output ADC (AD9283) into the memory of a standard PC (laptop under Windows 10 if possible). My software does real-time ...
fgrieu's user avatar
  • 1,670
2 votes
2 answers
256 views

Enter variables to microcontroller in external program

I am starting a project where I want to be able to control a couple of motors via my PC. I have 3 DC motors with dual speed (2 separate coils, old wiper motors). I am currently using a PIC ...
Killerpirate's user avatar
3 votes
3 answers
295 views

Should I measure ripple current on a replacement capacitor of lowered ESR?

I've changed an 820 μF capacitor on the output of a 1.05 V linear regulator which feeds the PCH (Intel's Platform Controller Hub), or "southbridge", on a PC motherboard.    It's working fine ...
Deep Thought's user avatar
0 votes
0 answers
77 views

How do I connect to the strange black contacts on a PC keyboard's PCB?

I want to build a little box with switches, so that I can flip a switch and it will hold down a keyboard key on my PC. My idea is to take the little PCB from an existing keyboard (a Microsoft Wired ...
Greenaum's user avatar
  • 310
1 vote
2 answers
757 views

PIKVM: How exactly does the frontpanel/ATX splitter work?

In order to start or reboot the PC, the PIKVM must have (shared) control to the frontpanel pins of the PC. In this GitHub article they say relays, wires and resistors are required: For ATX control (...
Tintenfisch's user avatar
1 vote
1 answer
176 views

PCB Silkscreen Marking

Today, I came on a PC board and the silkscreen marking have TG on it. What is the component for TG?
David Montgomery's user avatar
0 votes
0 answers
43 views

How to control the speed of four 12 VDC fans across two sources?

I destroyed my fan hub and am trying to replace it with a simple circuit. My PC has a fan header that can power the 12 V DC (not PWM) fans, however, it only supports two fans. So I am trying to power ...
Juhuxen's user avatar
0 votes
0 answers
77 views

28 pin SMD part marked AQ7DL identification

Can anyone help me identify this part? It is in my Dell AIO PC. It's located beside the power inlet. I guess it's some kind of power controller chip. P/N of MB is 0F65P3 It was burnt after a few ...
Jirawat Kusolpredee's user avatar
0 votes
1 answer
293 views

PC: Which crystal is used for main clock? (X570)

I want to improve intrinsic (hardware) precision of windows/linux (OS) time (specifically, in my case it's AMD X570 platform), without relying on periodic correction via NTP servers. Common approach ...
BarsMonster's user avatar
  • 3,219
0 votes
2 answers
248 views

Get on/off state of a PC (with 12V or 5V)

On a classical ATX mother board, how to get the ON/OFF "state" of the PC with a voltage? 0V if the PC is off 5V if the PC is on (or 12V or any other voltage) I thought about just taking ...
Basj's user avatar
  • 1,946
0 votes
0 answers
62 views

Converted PC power supply producing too much voltage

I have converted two ATX PC power supplies to 12V bench power. They have worked flawlessly for the past 5 years. Suddenly, both are providing 17V+. What could be causing this? I have a 10ohm ...
shaggy_sb5's user avatar
1 vote
0 answers
205 views

HDMI ground loop from gaming PC to AVR

I have a ground loop from my HDMI from gaming PC to AVR. It's very annoying. Aside from getting an expensive ground loop isolation transformer for 1000 W, is there any other way? Is there an HDMI ...
Nick Nickelson's user avatar
4 votes
4 answers
4k views

Will putting a resistor between a PC's fanheader pins convince the BIOS the fan is on?

Will putting a resistor between a PC's fan header pins convince the BIOS the fan is on? Will it catch fire? Do I even need the resistor? How can I convince the BIOS the fan is on without a fan? Edit: ...
cubesareneat's user avatar
1 vote
0 answers
347 views

Connecting 4P4C RJ9 Headset to 3.5mm pc port

I have a Plantronics CS520 Binaural headset that I'm trying to connect to my PC instead of a desk phone. I'm using a TRRS with T connected to speaker+, R disconnected, R connected to Mic, and S being ...
Mike's user avatar
  • 19
1 vote
0 answers
182 views

Detect if PC power is on/off then turn a TV on/off using an Arduino

I'm building an arcade cabinet using an old PC and an old(ish) Bush LCD TV as the monitor. The TV is connected to the PC graphics card via HDMI and all is good. However, the problem is that I want the ...
Ben Clarke's user avatar
3 votes
2 answers
275 views

Why does IBM PC XT use advanced memory and IO write strobes instead of normal ones?

I'm trying to dig into the early IBM PC's arhictecture, and got stuck with one thing that is not really clear to me. Every PC XT schematic I saw, including the original one from "IBM 5160 ...
Linol's user avatar
  • 33
1 vote
2 answers
775 views

Why can I use an AC power supply to spin DC PC-fans?

This question might seem a bit alarming and it did come up because of an inadvertency on my part. I tried to reuse old PC fans for cooling and grabbed an old phone power supply that wasn't being used ...
Prototype700's user avatar
-1 votes
2 answers
215 views

Inductive load turns on PC mouse RGB

I have a floor fan connected on the same outlet as my PC. When the PC is off, if I turn on or turn off the fan the mouse RGB lights up for a split second. The mouse is plugged in to a USB port that ...
Infinity98's user avatar
1 vote
1 answer
133 views

How to check the functionality of all the pins on stm32?

What happened: I was carrying my stm32 f401re inside a bag, and there was a little droplets of water inside the bag, when I removed the bag the MCU was wet, I wiped it gently on my clothes before ...
Mustafa Issa's user avatar
2 votes
2 answers
121 views

Substituting (possibly-proprietary) PC front-panel LEDs with commodity electronics?

Firstly, apologies for what I am sure is an incredibly novice question -- I have very little general electronics experience. Having previously built my home/hobby PCs from pre-existing components, ...
jimbobmcgee's user avatar
0 votes
0 answers
244 views

Is it safe to connect PC USB ground to 12V DC ground?

I want to drive a stepper motor (Nema 17), for which I have chosen 12V power supply (switching). In order to develop/play, I would like to connect a devboard (something akin Arduino) to USB. However, ...
Filip Sivák's user avatar
0 votes
1 answer
108 views

Scope PC software to interface with a real scope [closed]

I have a HP54645D mixed-signal oscilloscope that can be fully controlled via RS-232. Is there some general-purpose oscilloscope software that provides a scope-like interface, kind of like the ...
Vincent Guttmann's user avatar
1 vote
0 answers
71 views

Detect power/run status of PC in hardware

This may well be a daft question and/or a failure to google effectively (and apologies if this would be a better fit on SuperUser or somewhere else?) but is it possible, in low-level hardware, to ...
John U's user avatar
  • 7,159
-4 votes
1 answer
126 views

I accidentally poured Coca-Cola on my computer and it's the only one I have for studying [closed]

To solve this, I tried to dry it, and it kinda works. My PC get turned on but after that it began to turn off suddenly and the mouse is moving without any movement from me. How can I solve this ...
Hicham Jerdaoui's user avatar
-1 votes
1 answer
103 views

What IC is marked WDG273?

I want to buy this USB watchdog V5.0 in order to restart my computer in case the PC hangs. As I'm an electronic designer, I was checking the hardware and when I saw the main IC reference, I said: &...
Kotik_o's user avatar
  • 23
1 vote
0 answers
254 views

Looking for feedback on Bitscope BS50U. Is it an old design, no longer maintained?

I need an entry level, very basic oscilloscope with some logic analyzing features. Bitscope BS05U (http://bitscope.com/product/BS05/) is back in stock at Newark for $55.69 and I'm thinking about ...
Paul Jurczak's user avatar
0 votes
1 answer
306 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 ...
Marco Faustinelli's user avatar
0 votes
2 answers
691 views

Can I use an AC rated momentary switch as a PC power button? [closed]

I was looking to make a custom button to power my PC (I needed something which was a bit more custom than the traditional push buttons for PCs (it's not important)) and I came across these: https://...
Daniel Morris's user avatar
1 vote
2 answers
247 views

How do I incorporate output and input impedances connected to my circuit?

I'm designing a TTL to VGA DAC for a vintage PC, and I'm confused about the significance of the output and input impedances of my video card and monitor, respectively. The VGA spec states 75 ohms at ...
James Georgas's user avatar
0 votes
1 answer
122 views

Could a PC consume more power from the plug if it oparates in a colder enviroment?

I have a mining rig (computer using its processing power to calculate hashes in order to eventually be rewarded with cryptocurrency tokens.) The program I use to mine tells me each time the power ...
papajo's user avatar
  • 101
5 votes
2 answers
3k views

+ 12volt and -12volts from pc psu. Can I get 24 volts?

I have an unused pc atx psu. I want to make a bench power supply. The usual ebay breakouts give 3v 5v and +12v and -12v. Can I use an LM317 and make a variable output up to 24v? Any advice gratefully ...
Greg Martin's user avatar
1 vote
1 answer
157 views

Looking for ideas: An easy way to automatically press a key at computer restart

I'm looking to make a restart solution for a computer that doesn't necessitate manual input. I have a server with a BIOS that, when every slot of memory is full, automatically downgrades the speed of ...
Dewey's user avatar
  • 133
1 vote
1 answer
2k views

How to power 2x 12v computer fans with batteries & 1 switch

I am a total electronics newby (besides the odd solder repair) - I'm trying to create a robot with my son out of an old tower PC and he'd like to use the fans for eyes. I've seen that a fan can be run ...
Etcho's user avatar
  • 11
0 votes
1 answer
350 views

How exactly does getting 7V by connecting both terminals to the 12V and 5V sources work?

When I Googled MOLEX pinouts and checked some questions on Stack Exchange. I saw interesting images where if you were to connect both the 5V and 12V ends of the PSU connector to a device, you would ...
Delta Oscar Uniform's user avatar
0 votes
0 answers
1k views

Add 5V bias power to use an electret microphone with XLR audio interface

I recently acquired an audio interface (Behringer UMC22) and, since it's quite a bit better than my motherboard, I'd like to connect my modmic 4 to the XLR mic input. The interface has phantom power ...
Sto Cristian's user avatar
1 vote
1 answer
377 views

10Gb link data transfer between FPGA && PC [closed]

I'm trying to transfer data from 10Gb ETH subsystem of FPGA to 10GB ETH card of PC. SFP, RJ45 and ETH cable comprise of this data transfer pipeline. The RTL code is ready for testing and I'm looking ...
iamgr007's user avatar
  • 113
0 votes
0 answers
251 views

200Ah battery for a 500W mini ITX PC

I want to make a project that allows a 500 watt PC to run on batteries for 4 hours, so it can be worn by an individual on their back. I found the below calculation to get the capacity of the battery ...
Captain Comedy's user avatar
1 vote
1 answer
881 views

USB Qualcomm Quick Charge 3.0 on PC (Linux Ubuntu)

As nowadays PC motherboards supports USB voltage manipulation I will ask on given example hardware/software. I am using Ubuntu 20.04 installed on machine with Motherboard Gigabyte AORUS Z390 Master. ...
Michał Grzegorzewski's user avatar
0 votes
0 answers
141 views

soldering new connector to pc mainboard

I know this is probably not the right forum but anyway. I have this old mainboard 01AJ155. In the picture below you can see it has two PCI x16 connections. One connector is used by my graphis card. I ...
Yoomo's user avatar
  • 363
2 votes
3 answers
1k views

Adding a battery to my computer's PSU

Is it possible to simply add a car/truck battery to my computer's PSU output, in parallel, to make sure if there is a power outage, that the computer will seamlessly continue running, for a period of ...
Mladen B.'s user avatar
  • 129