Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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

119 questions
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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, and - is black but/and it won't operate when power…
isync
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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 connector. As fan as I know there are no premade…
ZeroKelvinKeyboard
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+ 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 received.
Greg Martin
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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 input port both contain "test inputs" (pp. 1-44): I…
cadaniluk
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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 analysis and logging of relevant events. Some latency…
fgrieu
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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: maybe I can power a ATTINY off the fan power…
cubesareneat
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Is there a way to use the i2c interfaces on a standard PC mainboard to control a device?

I have attached a few sensors and an LCD display, all of them having an I2C interface, to my raspberry pi, and written a software on the pi to read/write them. Right now, I have a network daemon running on the pi to retrieve data to my PC, and…
Guntram Blohm
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Why do PCI Express riser/adapter cards have electrical components?

I'm looking to make a custom PCI Express right angle adapter because the ones on the market don't work with my space constraints. Now, because it's basically an extension cable, I'd imagine it should be just straight traces running from the female…
Davbog
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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 but I want to confirm that I'm not stressing the new…
Kevin
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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 Technical Reference" use AMW and AIOW (sometimes also…
Linol
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How can I discharge static electricity from my body?

I am planning to install a PCI Express Wifi-adapter in my PC. In order to do this, I would need to open my PC. I'm worried that if there is static electricity in my hands it could fry the motherboard. I don't have an anti-static wristband, nor do I…
O S
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How to DIY BaoFeng radio-to-soundcard cable?

I've got a cheopo BaoFeng UV-5RE that I'd like to try as packet radio. I've snipped the plug off of the headset that came with the handheld, soldered it onto some breadboard cables, and did the same to one 3.5mm jack plug connector intended to go in…
DhP
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Minimum requirements to interact with PCI Express

I have a relatively simple project (from the user point of view) in mind. I want to develop a very simple PCI Express (x1) card that users can put into their system and toggle some GPIO's from a GUI program (e.g. to turn on/off some stuff). The…
DEKKER
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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 connected it with cable to pc through 4 pole to 2x 3…
typekcz
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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 microcontroller (8bit) on a Microchip Curiosity Board and…
Killerpirate
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