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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2k views

Inject 5V bias power (“fake” phantom power) for microphone (ModMic)

I've recently bought a ModMic4 for my PC, but the signal level is very low and have to amplify it quiet a lot digitally, which introduces ton of white noise and I have to use noise supression which ...
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2answers
61 views

How to choose the correct pc fan? [closed]

I need to replace a pc-fan 2 pin(80X80X25mm). The only details it has are:12V/0.14A.(no RPM/CFM details). Will those details(voltage/current)enough and i can pick any 80X80X25mm 2-pin pc fan which has ...
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2answers
417 views

How thick is a computer RAM module?

I was just using a DDR3 RAM module as a feeler gauge and it fit the gap perfectly. However, then I tried to find out how thick it actually is and I couldn't find any specs. I'm assuming it's ...
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2answers
93 views

Speakers make humming sound [closed]

I don't know if this is the correct forum to ask this, but I have a problem with my audio set up. The setup goes as follows: PC -> external audio card (via usb from pc) -> stereo equalizer mixer (via ...
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637 views

PC power supply charge 12v battery

Two part question. If I take the 11v and 5v, with diode to prevent 11v to flow to the 5v, will I get 16 volts? And will it charge a 12v battery? Last how can prevent overcharge? Also this is an ...
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3answers
1k views

Can you determine RGB pinouts with a multi meter?

I have a Swiftech Apogee XL2 that has an addressable LED inside it. I want to connect it to my other RGB setups but I need to know the pin signals and voltage of the LED. I have a multi-meter at the ...
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2answers
876 views

VGA cable arcing against computer case

I've tried to turn on my old PC with my old LCD monitor, which is powered by a kettle cable directly from mains, no power supply brick). When trying to get it to work, I have noticed the following ...
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2answers
10k views

PC Headset crosstalk

I had issues with crosstalk (microphone picking up headphones sounds) and thought it was caused by headset. So I removed headset's original cable, put 4 pole female 3.5mm jack on the headset and ...
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1answer
548 views

Powering 64 SATA HDD from Single ATX Power Supply

I am planning to wire a 4U DIY JBOD top loader. Looking at the power output of several power supplies they have a a maximum rated 5v rail of 100-125w. By looking at the spec sheet of my chosen HDD I'...
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1answer
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Conformal Coating PC Parts?

I couldn't find any topics relating specifically to this sort of thing, and even tried asking folks over on Reddit at /r/buildapc, but I didn't get many responses or many people know if it would be ...
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1answer
652 views

How to connect a PNP inductive proximity sensor to a PC? [closed]

I have a PNP metal proximity sensor. I am using it to test a door lock mechanism. I need a way to connect this sensor to a PC and make a user interface to show me the signals and the values. I haven'...
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Powering PC from motor generator

Commonly there are basic motor generator sets (with or without automatic throttle to compensate for load variations) and then there are those with an inverter to produce a cleaner sine wave using ...
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2answers
317 views

Is it possible to measure and log temperature using a microphone port of PC?

Instead of using an expensive logger, I'd like to measure and log temperature using a PC microphone port. I'm going to use TMP36 Temperature Sensor. The output voltage of the sensor is measured by ...
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1answer
785 views

Wiring RGB Vandal Switch as PC Power Button

I'm trying to wire up a Schurter CPS16 capacitive, multicolour (RGB), anti-vandal switch to my PC for use as a power button. The switch function is momentary and normally-open. Tech Sheet I'm just ...
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2answers
71 views

Communicating with devices from PC [closed]

For a few years, I have been using microcontrollers to do simple hobby projects that require using various communication protocols (serial, i2c) and toggling GPIO pins. However, the computational ...
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1answer
166 views

Is it a good idea to connect PC to a non-isolated DC supply

I am working on an AC Voltmeter. The supply to the microcontroller is not isolated. Only a bridge rectifier is used convert AC to DC. To get 5V, resistors are used to drop down the voltage. Is it a ...
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2answers
1k views

External power supplies and DC to DC converters for Computers and notebooks [duplicate]

Part one : I have this Question , as we know , Most notebooks power adapters are 19.5V output. While the CPU and GPU works on 12V and the SSD works on 5V . , so the motherboard should have two DC ...
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5answers
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How can I calculate how much my desktop PC costs to run for an hour?

I was torn on whether to post this to here or Math.SE, so feel free to move it as appropriate. I recently got hold of a power usage monitor in order to calculate how much my PC costs to run a given ...
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1answer
178 views

PCIe DMA transcation to multiple PC RAM slots from FPGA

An FPGA endpoint needs to needs to transfer large quantities of data to the host processor's RAM over DMA. So memory mapping to a single RAM might not be possible. Normally high end PCs or Servers ...
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2answers
255 views

Arduino shorted my PC USB drive [closed]

I am wondering what happened. Here are the things I did. connected 3 drone motors to ESC and then to arduino board. I double checked the connections, so pretty confident. I connected the gypo MPU ...
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2answers
506 views

Looking to bring 24V inputs to PC to store in database

I've been given a project that sort of bridges the electrical/PLC and PC/software world. I have to take a 24VDC photoeye and 24VDC encoder (1/4" to 1/2" pulse @ 540FPM ~ 1 pulse every 2.3ms-4.6ms) ...
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2answers
64 views

programmicaly switch electric power [closed]

I am an experienced programmer (mostly C#), I also know how to get along with physical electrical circuits, but do not know anything about how to start the simple task of connecting a switch (12v or ...
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1answer
488 views

How much current the PS-on pin on the motherboard's power connector can sink?

How much current the PS-on pin on the motherboard's power connector can sink? can it sink 100-200mA? (to activate a relay/solid-state-relay when the motherboard wants to turn/keep on the computer) (...
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2answers
586 views

Can I use offline UPS for a PC? Will the delay affect my PC if it is running when the power goes out? [closed]

Can I use offline UPS for a PC? Will the delay affect my PC if it is running when the power goes out? im planning to set up an offline UPS at my home i need my PC running without any disruption but i ...
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2answers
178 views

Can we replace an embedded system design with a general purpose computer or a smartphone?

I am a newbie to embedded systems design so this question might seem very fundamental in nature. I have been working as part of an Avionics team to develop an on board computing device for a ...
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1answer
757 views

Confusion about “host bus controller” and “host bridge”

Below part is quoted from the book "Beyond BIOS". Each host bridge is represented in EFI as a device handle that contains a Device Path Protocol instance, and a protocol instance that abstracts ...
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3answers
128 views

loading different files into a PIC [closed]

Is there any way to load a file (of extensions .bat or .HTML) into a microcontroller and make the microcontroller run the file when it is connected to a PC using UART EDIT: thanks for information but ...
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0answers
485 views

Devices USB grounding

I just opened a PC a client brought, with some software problems. While fixing those problems I opened the case to check if there was something that needed maintenance and I noticed the USB shield ...
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1answer
263 views

Fan PWM Emulation with SATA power

I am just getting into electronics, and I thought I knew enough to make a simple fan control circuit. The idea is that I can install a switch into my PC case that I can press in order to add a fan ...
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2answers
87 views

Is there any device such as a typewriter or keyboard that is portable and can save data to a USB (other than a cell phone or smarthphone ) [closed]

I need a device for take notes Is there any device such as a typewriter or keyboard that is portable and can save data to a USB (other than a cell phone or smathphone ) please give me a suggestion
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3answers
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Connect a micro switch to a PC serial port

How do I connect a micro switch to a PC's serial port and query whether it is open or closed? Which serial pin number(s) do I need to wire up?
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When has an embedded PC finished its shutdown process?

We have a product that has a PC running on a small board. Our product generally runs for weeks, if not months. One thing that is not very well implemented is the shutdown process. The device does ...
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3answers
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Getting Clock/Time information from PC to an STM32F4

Assume I connect a microcontroller board (like an STM32F4) to a PC via USB. Is there anything in the USB communication protocol that contains host clock data? In other words, can I sync the ...
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5answers
17k views

What's needed to put a PC fan into reverse?

I've got a PC fan here (I've peeled off a sticker). And although this one doesn't come with the usual 3 or 4 wire connectors, it has enough electronics in it to only operate when power + is on red, ...
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1answer
373 views

PC monitor USB hub backfeeding inro PC

So I bought a Fujitsu P23T-6 Thor Edition a while back to use as a second monitor, it had an built in 2 port USB hub which I use for plugging in my keyboard and mouse. Now yesterday I watched a video ...
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1answer
223 views

What does short circuiting a RST front IO header do?

My motherboard has a connector to enable the use of a front panel RESET button: I would like to simulate the press of the button (equivalent to short circuiting the wires) by a Raspberry Pi, by ...
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1answer
996 views

Switching power supplies with a relay, how to account for delay between connections? [duplicate]

this is my first post on this site (but I will have more, have no doubt), so if I have posted in the wrong section or something please forgive me. Anyway, I am currently doing a battery powered pc ...
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1answer
307 views

Intel 8042: what are “test inputs”?

I've implemented a driver for the Intel 8042 (keyboard controller in the IBM PC AT). The IBM 5170 (PC AT) Technical Reference served as my, well, reference for that. The output port and the test ...
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5answers
10k views

How can I adapt a 3-pin PC fan connector to a 4-pin connector?

My computer's motherboard uses all four pin fan connectors with no support for speed controlling the older three pin fan connector. The problem is, all the PC fans that I have use a three pin ...
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2answers
690 views

Simple PC fan controller PWM discrete components

Recently I switched some case fans in my pc to find the horror that the new ones were even louder than the old ones. After some quick checks just by eyeing and monitoring on my pc I can confirm the ...
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3answers
878 views

Wireless Communication between microcontroller and PC

I have a FRDM K64f board that is using the nRF24L01+ as it's wireless transceiver. I want to communicate between the K64f board and my PC locally. I am struggling to find the hardware needed on my ...
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1answer
99 views

Question about FTDI USB-to-Serial Evaluation board [closed]

The evaluation board I am talking about the FTDI EVAL232R evaluation board which can be found at the bottom of this page. It employs a FT232RL IC. What I want to do I would like to connect a USB ...
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3answers
415 views

PC power supply as bench power supply [closed]

What do you think about converting pc power supply to bench power supply? Is it ok for amateur use? Edit: I thought it has some current limiting mechanism, but I see it doesn't. It's big problem in ...
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1answer
109 views

Is It Safe To Test A Pc With A Possiblly Burnt PSU

about a year ago my dell desktop pc wasn't turning on. the power button kept blinking orange. so I thought maybe something was loose or switched off. I looked at the back of the psu and saw a red ...
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FTDI code 10 - what can I do to resolve problem?

I am using the FT230X as a USART to USB interface on my boards. The first few work OK but then with the last one I get a Code 10 (cannot start) on my PC. It works fine on another PC when tried. I ...

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