Questions tagged [computers]

Questions regarding architectures or design of specific parts, not consumer-related questions.

Filter by
Sorted by
Tagged with
0 votes
2 answers
42 views

HDMI: Can a computer still detect a monitor properly if some of the TDMS pins/wires are damaged? [closed]

Can a faulty HDMI-cable with damaged TDMS pins/wires still work to the extent that the computer can still detect the monitor, but the monitor just will not display anything (except for no signal)?
user avatar
  • 101
1 vote
1 answer
92 views

A component has blown on my HP elite book 840 G6. I need help identifying it if it all possible

Here are the pictures. It was late and I shorted 2 pins of the smart card reader ribbon connector. Don't know how such a stupid mistake, but this component on the other side of the board went up and ...
user avatar
0 votes
1 answer
72 views

I’m getting little more than 12 V in my computer PSU, should I use it?

I bought a refurbished computer ATX PSU, it had the most generic PCB I have ever witnessed. Seems like has a optocoupler and works with sdc2921 IC. In 12 V rail I’m getting 12.25 V. In 5 V I’m getting ...
user avatar
1 vote
1 answer
62 views

ESD Wrist Strap When Working on Monitors and Power Supply

My book for the A+ exam specifically says not to use ESD for repairing monitors or power supplies. Why is this? I understand that their capacitors hold lethal amounts of charges, but the motherboard ...
user avatar
1 vote
1 answer
104 views

Looking for an explanation of grounding in relation to computers and DVI-HDMI adapters

I recently found that a DVI-HDMI adapter, purchased to connect the micro-HDMI port on my new Raspberry Pi 400 to the DVI port on my monitor, behaves strangely: it works well when connecting to my ATX ...
user avatar
  • 113
12 votes
6 answers
2k views

My Professor and I are debating about absorption law

So the question is \$(w+y)(wz+wz')wy+y\$ and this is my answer by absorption law where \$A+AB=A\$: $$ (w+y)(wz+wz!)w y + y\\ B A + A $$ So the answer is \$A=y\$. My professor said I ...
user avatar
  • 159
0 votes
1 answer
72 views

Old computer socket disconnection, cleaning, and repair [closed]

I have very old computers; from time to time the RAM disconnects. I remove the DIMMs, clean the sockets using Isopropyl alcohol many times until it works again. It will be fine for few weeks, but I ...
user avatar
  • 21
2 votes
2 answers
109 views

Calculating the required voltage supply [closed]

There is a Single Board computer that gives a range of input supply as xvolts - yvolts. Let's say we add a few more additional components like webcam or additional storage drive. Taking these into ...
user avatar
  • 139
18 votes
4 answers
7k views

Electrical reason for the minimum altitude (-50 feet) in the computer specs?

Are if there any electrical reasons not to operate or store my Dell OptiPlex computers below the altitude of -50 feet, as written in the specifications? Screenshot of the original Dell OptiPlex ...
user avatar
  • 183
7 votes
1 answer
1k views

Enable vendor-disabled hardware on tablet? [closed]

I have a nextbook tablet (one of those cheap things from walmart) that I was looking to try to improve the RAM situation on to breath some new life into it as it apparently only has 1G of it. I ...
user avatar
  • 89
8 votes
1 answer
175 views

Backwards compatibility of PCIe AC coupling capacitors

The PCIe base spec mentions that platforms operating only at 2.5GT/s or 5GT/s may use AC coupling capacitors in the 75nF-265nF and that platforms supporting 8GT/s and above must use 176nF-265nF. ...
user avatar
3 votes
3 answers
3k views

Why aren't current CPUs designed for more powerful cooling systems? [closed]

Chips on the present can't get smaller, higher speeds and voltages increase heating, so why don't CPU manufacturers aim for more powerful cooling systems instead of looking for parallelization? We are ...
user avatar
-1 votes
2 answers
96 views

What is the most important CPU price factor [closed]

I have two intel CPUS with distinct features. intel i7 8550U intel i5 8300H Which have big performance difference with the cheaper 8300H being higher in memory ...
user avatar
  • 99
0 votes
1 answer
73 views

Where or when is it unsafe to clean using compressed air? [duplicate]

There's this lesson on ICT for us in cleaning computers and their equipment. One of the components that can be used for cleaning is something called compressed air. Just to make sure, which computer ...
user avatar
10 votes
9 answers
3k views

Was the Intel 186 chip commonly used anywhere? Was it only found in industrial computers? Why not PCs?

I don't think the Intel 186 was in any "home computers" or PCs, but I see other people referencing it as a common chip. Also, I've heard that NEC V20s had the 186 instruction set in addition ...
user avatar
  • 117
0 votes
1 answer
82 views

Will a computer fail sooner the more you use it? [closed]

Is a computer like a car in the sense that the more you use it the quicker it will break down? Assuming that we have a regular computer with SSD that is running 24/7 versus a computer that is run ...
user avatar
3 votes
1 answer
101 views

Why can't you make a thunderbolt 3 hub?

So laptops with thunderbolt 3 are pretty common, docks are common, every other kind of USB seems to be able to be used with a hub. I know thunderbolt 3 can be daisy chained, theoretically eliminating ...
user avatar
0 votes
2 answers
333 views

Which alcohol is bad to use when cleaning computers?

I heard there are some alcohols that are prohibited to be used when cleaning a computer or an electric device. Apart from beverages, which ones are these?
user avatar
2 votes
1 answer
116 views

Doubt in pipelining forwarding in MIPS

I am fairly new to computer architecture and having a tough time solving problems based on pipelining. I was trying to solve a problem from this pdf I found on Google I have a doubt in part ...
user avatar
0 votes
2 answers
65 views

reversal of computer camera image [closed]

Why do so many embedded cameras in computers, etc., prsent a mirror image? It means anything with writing on it is backwards. Why is this desirable?
user avatar
0 votes
1 answer
54 views

How do I send a signal from my computer to my USB antenna

I'm trying to make an RC car that can be controlled by my computer. The heart of the car is a simple mother board from an old toy. It basically accepts a signal 49MHz from a controller with a 9V ...
user avatar
  • 1
0 votes
0 answers
183 views

PWR ON motherboard with Touch sensor TTP223 and Transistor

I have a TTP223 touch sensor, a BC347 Npn transistor and 10Kohm resistor. I want to make a touch button as substitution for my pwr physical button on the case of my pc. On the motherboard I have 2 pin,...
user avatar
  • 1
0 votes
2 answers
103 views

Why do server mainboards use different capacitors for their VRMs?

Recently I noticed that server mainboards use a different type of capacitor as part of their VRMs (after the inductor). I believe they are ceramic capacitors, whereas consumer boards usually use ...
user avatar
  • 1
15 votes
3 answers
2k views

PC ATX12VO (12V only) standard - Why does everybody say it has higher efficiency?

To my understandings, the new 12-volt only standard moves the 5V and 3.3V supplies off from the ATX power supply "box" to the motherboard. According to PC World (which is cited by Wikipedia),...
user avatar
  • 281
3 votes
2 answers
190 views

What type of electronics is typically used to interface between PCs and custom hardware? [closed]

I have tried to make this question acceptable for StackExchange, I am not looking for buying advice, just either examples of hardware that could have been used or the name of types of devices I should ...
user avatar
  • 75
1 vote
1 answer
111 views

using citric acid alcohol solution to clean rusted terminals

I used to clean old computer sockets and terminals with citric acid solution in alcohol. It worked fine for long time, but for the tiny connectors of DIMM Ram sockets it works for a very short time ...
user avatar
  • 21
0 votes
3 answers
130 views

Has there been any deliberate implementation of combinational logic soft error correction in any consumer-level product, like a CPU/microcontroller? [closed]

Prologue It is well known that many error detection, mitigation, and correction methods, such as parity or ECC, have been available in large memory banks, like for RAM, for decades now, and even in ...
user avatar
  • 111
0 votes
1 answer
148 views

I spilled candle wax on the video card in my computer, should I be concerned?

I have just accidentally spilled lavender scented candle wax onto my video card. This is a RX480, the kind with holes that expose parts of the circuitry. the way the candle wax fell, it got onto that ...
user avatar
1 vote
1 answer
625 views

How can I modify single-cycle MIPS processor to implement jal command?

Hello Stack exchange community I was wondering which modification should I have to make in order to enable single-cycle MIPS processor to run a jal(jump and link) command? My most pressing confusion ...
user avatar
  • 11
0 votes
0 answers
45 views

Single Light switch to turn on/off based on computer program running

Brand new here so please be gentle lol Im interested in creating a light switch that turns on/off based on whether a computer program is running (Mac for now). I'm not entirely sure what components I ...
user avatar
0 votes
1 answer
42 views

Can two x-bit ALUs/FPUs be combined to create an equivalent a single 2x-bit ALU/FPU?

I was wondering, can 2 16-bit ALUs/FPUs be combined to create a 32-bit ALUs/FPUs, or are 4 ALUs/FPUs required? I was wondering if lower precision ALUs/FPUs can be combined in any way to create a ...
user avatar
0 votes
3 answers
215 views

Are FPUs made of ALUs, and how many ALUs are needed to make up an FPU?

In GPUs/CPUs, are FPUs made up of ALUs? If not, what would be a smaller "logical unit" that FPUs are made up of? If FPUs are made up of ALUs, how many ALUs would it take to make up a 16-bit ...
user avatar
0 votes
1 answer
70 views

Choosing the right DC-DC converter for a computer

I am looking at converting a computer to run off of a 12V battery, which means replacing its PSU with a DC-DC converter. So, assuming that the computer is currently using 600 Watt PSU, then I assume ...
user avatar
  • 2,128
0 votes
1 answer
85 views

Is a loose psu plugged into a three prong outlet but off a good thing to clip to an esd mat aligator clip?

I bought an anti static mat, ifixit portable, so I wear the wrist strap, clip it to the mat, the ground wire that came with the mat clips the the mat the other aligator clip clips to the grill of a ...
user avatar
0 votes
2 answers
88 views

Is unplugging computer power cable from PSU the same as electricity outage?

I am not sure if they are the same, but something puzzling just happened. My dell precision workstation 2007 has been fine ever since, with many, many power outages over the years. But there is a time ...
user avatar
  • 1
-3 votes
1 answer
68 views

Removed component on motherboard [closed]

(Is this even a electronics related or computer related?) Does anyone owns a Dell Optiplex 780 DT? I was adding a graphics card and I accidentally bumped the bracket into the PCB and I checked the ...
user avatar
  • 27
0 votes
2 answers
69 views

Why computers can be modeled as sample and hold system

I was reading digital control system from book by Norman S.Nise and in book it is written that "computers can be modeled as a sample and hold system " Isn't computer is discrete time system ...
user avatar
  • 1,124
0 votes
1 answer
259 views

Is it possible to make a keyboard with "Game Controller" style printed circuit boards and buttons?

For a long time I've wondered if it's possible to make a keyboard with PCBs similar to the ones used in NES controllers or just video game controllers in general. If it can be done with keyboards it'd ...
user avatar
0 votes
2 answers
719 views

Is EMI/EMC still a big concern for a PC case?

I've recently started looking into researching potential concerns when it comes to using a non-metal material for a custom PC case, specifically wood. I've seen people talk about heat, electrical ...
user avatar
0 votes
1 answer
55 views

Understanding USB Descriptors speed

I have several USB devices that are capable of running High Speed 2.0 (480 Mbps) mode but runs Full Speed 1.1 (12 Mbps) instead. Take for example a USB DAC: It advertise USB 2.0 compliant and fall ...
user avatar
  • 37
1 vote
1 answer
73 views

Why is overflow error in two's complement addition represented by XOR-ing the last two carries?

The first chapter of my textbook on microcontroller theory has the following paragraph. Here is one of the examples provided. The book shows three such examples, but provides no explanation for why ...
user avatar
  • 195
1 vote
1 answer
226 views

Can someone help me establishing the polarity of this dc jack on my laptop motherboard?

So my laptop charger port is fried and I wanted to establish the polarity of the points on the board so I can solder a off the shelf jack instead of the original one which is not available anymore. I ...
user avatar
-1 votes
2 answers
194 views

Is it okay to use a 200W PSU as a replacement for a 500W one?

I had a strong PC which is no longer functional at this point. One day while i was using it, it made a click sound and turned off abruptly. It also gave some kind of burnt wire smell which made me ...
user avatar
0 votes
2 answers
58 views

Uninterruptible power supply - How it manages to provide electricity to electronic devices before it shutting down?

I believe there is a lag in time (I think the latency for the switch over can take some milliseconds) when a switch over to the battery backup happens. I understand the electric appliances like motor, ...
user avatar
  • 83
1 vote
0 answers
284 views

Help needed finding laptop FFC keyboard connector

I have a Thinkpad T440 keyboard that I'd like to convert to a USB keyboard. I've been looking for an FFC connector for it and it's been difficult finding it. It has 32 pins and 0.5mm pin pitch. The ...
user avatar
  • 11
2 votes
1 answer
247 views

8 Bit Computer Program Counter (4 bit Counter IC) Counting When Disabled

Awhile back I built a version of Ben Eaters 8 bit computer, on my build, I changed only AND, NOT, and OR gates to all NAND. Otherwise the design was exact. I tested it before touching it and found ...
user avatar
  • 163
1 vote
1 answer
147 views

Building my own on-off button for a PC

I'm looking to build my own power button for my computer. Most motherboards have a pair of PWR_SW pins that your case power button typically attaches to via two ...
user avatar
  • 111
5 votes
7 answers
5k views

Why do computer circuits tend to have so many resistors and capacitors? [duplicate]

As someone who has a decent understanding of computer architecture (but not of electrical engineering) I've always wondered why computer circuits tend to have so many resistors, capacitors, and other ...
user avatar
0 votes
3 answers
95 views

Can an instruction set do everything?

Given a certain instruction set, and that any high-level code is just converted to machine code anyway, then except simulating human intelligence, is it sufficient enough to do anything you want a ...
user avatar
  • 377
2 votes
5 answers
831 views

How does a microprocessor control its transistors? [closed]

Or in other words, what is the more fundamental building block of an IC below transistors? When I load a code onto my microprocessor, how (fundamentally, sure some people here could write books about ...
user avatar

1
2 3 4 5
7