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

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2
votes
1answer
208 views

How to combine PC's power and HDD LEDs?

I'm going to buy a PC tower case which has only one LED intended to be used as the power LED, thus no HDD LED is available. My intention is to have that single LED at about 50% of its intensity when ...
4
votes
8answers
117 views

Why can computer circuits recognise only two states?

Computers can only understand binary (that is 0s or 1s). I want to know Is there any way that computers can understand more than 2 states. I know that It is much harder to build components that use ...
0
votes
1answer
57 views

misunderstanding of a Computer Architecture

I have the following architecture , and the timing diagram below . my question is , it's seem that no 'relation' or dependency between control logic and Extender , but at timing diagram , the time of ...
0
votes
1answer
51 views

Is the a limit for screen resolution? [closed]

I think I am right in saying that 8k UHD is the highest a screen can go, so is there a limit to the number of pixels on a screen, limit to what the eye can recognise or what is physically possible? ...
29
votes
10answers
2k views

What is a Charge?

I'm a high school student. I love computers and electronics. Few weeks ago, I thought to build my own electronic gadget but, unfortunately I had not much knowledge in electronics. So, I decided to ...
1
vote
0answers
52 views

Commodre C-64 Vintage Computer Weird Problem [closed]

I have and old C64 which worked fine until today. From several hours ago (my friend playes Ski Jumping) following problems appeared: Once turned on, the ROM basic activates and on TV the factory ...
3
votes
3answers
226 views

Computer line-in voltmeter

I'm about to make a voltmeter from computer line-in. In some strange way I can not see direct current from computer. Why does it work only with alternating current? What information does captured wave ...
0
votes
0answers
52 views

How does a software intruction materialise to hardware action? [duplicate]

Please feel free to rephrase / reinterpret the question. Rephrased - RM: How does a program which can be represented by high level language commands or opcodes or a series of 1's and 0's get ...
1
vote
2answers
113 views

Protocol to be used to make microcontroller to work as mouse

I'am Doing a "Wireless mouse using data glove" . In this user wears a Hand glove equipped with sensors, microcontroller & transmitter. I could detect left & right movement of hand & i ...
2
votes
3answers
316 views

History, reason for and implications of the 2 modes of a modern microprocessor?

The modern microprocessors I've dealt with could have 2 modes: User and superuser (and sometimes this difference was just in the manual and not actually implemented like with the Nios II which states ...
0
votes
1answer
62 views

Computer-readable potentiometer

I have a device that essentially controlled by a potentiometer and a rotary switch. I would like to keep these (although I would replace them with other components if that helped), but I'd like to be ...
6
votes
4answers
380 views

What exactly gets “worn out” and damaged by heat?

Its quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if it's not overheating per se. If, for example, ...
-5
votes
1answer
66 views

Is it possible to “record” an electric signal sent from a PC motherboard to the old “buzzer”? [closed]

First of all, sorry if I use the wrong terminology. I would like to know if it's possible (and how) to record the signal that a motherboard sends to the buzzer (the internal speaker), so that I can ...
0
votes
2answers
176 views

How can we use a usb(in a laptop) for general purpose input/output operations, such as robotics control [closed]

How can we use a usb port (in a laptop) for general purpose input/output operations, such as robotics control?? I want to control an external hardware such as a robot or say simply an array of LEDs ...
2
votes
4answers
135 views

IO Pins for Computer like an Arduino

Just wanting to ask if there's a way that an old computer could be like a microcontroller. In the sence that it has a range of pins (standard, PWM and analogue), both input and out put could be ...
5
votes
3answers
208 views

How do sound cards cope with negative voltage?

I feel this is a basic question but I found no answer for it so far. Let's take a random sound card that lives within a PC. From the connections at the end of the datasheet I assume that it is ...
-1
votes
2answers
111 views

Is there any heat/energy 'lost' to computing power? [duplicate]

I have a Kill-A-Watt Power meter on my computer that has a GPU mining bitcoins. It draws 500W from the wall outlet. My question is, is my computer outputting any less heat than an equivalent 500W ...
1
vote
2answers
65 views

Circular DVI Connector

I am building a custom computer case into a 40mm grenade case however I am running into an issue with how to handle the DVI connections (need two of them). Ideally I would like to use a circular ...
2
votes
1answer
123 views

Building a simple PC - looking for a CPU [closed]

I would like to build a computer. It is a child's dream that I had and now that I am at college, I finally gain the knowledge I need. I want it to be simple. I admire the early designs of 1990's ...
1
vote
3answers
89 views

Output changing electrical currents from a PC

I need to send fast-changing electrical current from a computer to electrodes connected to muscle (Not the point). I need to send multiple different currents simultaneously, and that the current ...
1
vote
1answer
178 views

Maximum power which can be asked from a PC?

I want to attach an external circuit through a six-pin connector to my computer, which is supplied with 220V. How can I find the maximum power that the PC can supply to the circuit?
2
votes
1answer
102 views

Easiest way to detect a button push

I have a button that when push turns on a little light (light blinks; like a counter) - is there an easy way to hijack this signal so that my windows box can also detect if the button is pushed? I ...
4
votes
3answers
497 views

trigger alarm with relay from PC sound output

As a total beginner, I have a project of creating an alarm device for a sailing boat. The background is the following: a Mac-mini collects, by means of different computer programs, alarms from ...
6
votes
3answers
344 views

Can I “trick” a PC Powersupply to power something other than a Motherboard?

I have a generic PC powersupply I'm using to power a BFL ASIC Bitcoin Miner. It takes an input similar to a PC Video card with two connectors that look like this ...
3
votes
1answer
98 views

Are there gate-level ways to produce the min or max of two binary values?

Some basics of digital logic are the half adder and full adder. We know how to produce the sum of two binary values at the level of and/or/not gates, in a straightforward way presented in many ...
1
vote
1answer
147 views

Plugging in monitor causes floating ground on computer enclosure resulting in shock hazard [closed]

Every connected metallic part of computer cabinet was giving shock. I diagnosed and found out that on switching monitor off stops the current leak and shocks. I fail to understand the reason for it ...
-2
votes
1answer
95 views

Ruptured wires or faulty circuit on a notebook keyboard? [closed]

I have a notebook Acer Aspire V3-771G Recently the following set of keys started to work only intermittently: 3,4,E,D,C They either all work or none. At first I thought this was a problem with ...
1
vote
1answer
95 views

Enabling uClinux to run on Altera DE2-115?

I'm trying to learn Qsys and Quartus II to define a system that can run linux according to this document: http://uuoc.org/uClinux_nios2_custom_hardware.pdf But I'm running into problem as the ...
0
votes
1answer
69 views

Ratio between register and primary memory access?

I've been doing research to find how much faster register access is compared to primary memory. I find the ration is about 100 times faster, can that be correct, has it always been about that number ...
2
votes
3answers
397 views

Low Voltage DC Automatic Transfer Switch

I am new to circuits and have a very basic knowledge, and am currently interested in building a simple circuit that would take 2 DC inputs each of 12V 1.5A and output 1 x 12V 1.5A input even if 1 of ...
1
vote
1answer
279 views

What is the output voltage range of computer headphone ports?

I made a simple microphone with amplifier which outputs 9V max signal. It's biased in the middle somewhere around 4.5V. I hooked the output of the circuit to the computer speaker audio in. I was ...
1
vote
1answer
95 views

Measuring the mic signal of a computer headset

my colleague and me have hit a brick wall - and are hoping somebody can help us out here :) Following scenario: We record some data using a computer with an NI card and some signal transducers. We ...
4
votes
5answers
706 views

Why are smartphones and tablets ARM based?

Why don't these devices use Intel processors like laptops do? Why are they restricted to ARM? Also for Windows 8, do they want ARM just for tablets and smartphones or is it also for laptops/desktops ...
2
votes
2answers
125 views

External CPU design

Apologies if this is a dumb question. I don't have any training in electrical engineering, so I can't gauge for myself how ridiculous this sounds. Would it be possible to modify a commercial CPU so ...
0
votes
1answer
88 views

What's the difference between delayed branch and branch prediction?

I'm studying how delayed branch works and I'm trying to distinguish delayed branch from branch prediction. What is the difference? Is delayed branch a means to facilitate a control hazard?
0
votes
1answer
51 views

How to calculate the address fields for a cache?

I've a homework question about 32-bit cache memories: For a cache memory that has size 16kB (16384 byte) and blocksize 2 words, state the names and the sizes of each field of the address that ...
1
vote
2answers
160 views

What is the meaning of “Register.Rd”?

Reading Hennesy's book "Computer Organization and Design" it is mentioned "Register.Rd" and "Register.Rs" but what does it mean? The .Rd, .Rt and .Rs parts I can't understand, on page 365:
0
votes
1answer
106 views

How is sign extension used in practice?

In wikipedia it says what sign extension is but it doesn't say what it's used for or when it is used. I read Hennesy's book "Computer Organization and Design" and it has a sign-extension mechanism ...
2
votes
1answer
146 views

What does RWM mean?

I'm studying computer hardware and the acronym "RWM" appears, so I wonder what it means? It has to do with LOADs and STOREs of instructions.
-3
votes
1answer
162 views

Best way to Interface with PC/MAC/iDevices/Smartphones [closed]

What do you think is the best way to communicate a hardware with PC, MACs, iDevices and Smartphones (with Android, Windows Mobile, etc.) ? We need to make a voice chat (like VOIP) and also exchange ...
-3
votes
2answers
173 views

where to begin learning PC board designing [closed]

can someone please guide the correct path to learn board designing for computers. being specific i am just keen to design a SBC(single board computer) just for hobby purposes my current knowledge is ...
1
vote
2answers
652 views

Can I connect a Solar Panel to augment my computer's power supply directly to a 12V line?

I use my computer to mine Bitcoins with a HD 7970 GHz Edition GPU. It currently draws a steady 465W. I would like to offset the draw, if possible, with a reasonably priced solar panel (~240-500W). ...
6
votes
4answers
654 views

Recommendation of a USB to RS232 chip for industrial environment

I have bought a device which has a ATMega microcontroller and a FTDI chip which connects to a computer through USB. The FTDI is used only as RS232 to USB adapter. My problem is that this device ...
1
vote
2answers
39 views

Creating a unit to input an array of different computers display/sound and output only 1 with a switch to select

I have a few computers and I was wondering if there was an inexpensive way to link them all to a box that I would be able to use to select which ones I want outputted to my monitor(s). I've only ...
7
votes
4answers
608 views

How to find socket for keyboard connector?

I am looking for a socket which is able to receive the connector of the ThinkPad X41's keyboard. How do I identify the socket so that I can find it on the (German) market? Background: I want to build ...
1
vote
2answers
323 views

Where to get 12V from my computer?

Since I am having some trouble with a battery pack and a charger I want to use for a home robotics project I got a tip to just use some alternative power source and buy a new battery and charger once ...
1
vote
2answers
835 views

Calculating maximum data rates

A channel has bandwidth 3 KHz, signal to noise ratio is 40 dB find maximum data rate for 16 level encoding schemes. There are two ways to find channel capacity. First one is with Nyquist theorem and ...
1
vote
2answers
1k views

Using a computer, to turn on a light bulb on and off many times

I build my own pcs, like coding (a little bit) and into engineering. What I want to do is basically take my computer, hook it up to a circuit with a light bulb and then run a program that will switch ...
1
vote
2answers
412 views

Using Audio Input of computer as Oscilloscope for Hobby Electronics

I just discovered an app for mac that uses the Audio Input of the computer and the AD-converter in the sound card as an Oscilloscope. First, I was thinking this can't work... but theoretically, it's ...
4
votes
1answer
165 views

How large is the address decoder to select an address in RAM? Is the address decoder just a bunch of multiplexers?

I have recently started building simple computing devices using logic gates inside of Minecraft. What I'm trying to build right now is some RAM, and an address decoder for this RAM. I want to build a ...