Electrical Engineering Weekly Newsletter
Electrical Engineering Weekly Newsletter

Top new questions this week:

My understanding of RC circuits is broken

I asked a relatively simple question. Unfortunately, the answers provoke far more questions! :-( It seems that I don't actually understand RC circuits at all. In particular, why there's an R in ...

capacitor filter  
asked by MathematicalOrchid 52 votes
answered by Phil Frost 46 votes

Is a capacitor a high-pass filter or a band-pass filter?

This has been bugging me for a while now... Does a single capacitor, on its own, behave as a high-pass filter or a band-pass filter? In a crystal radio set, you use a single capacitor as the tuning ...

capacitor filter  
asked by MathematicalOrchid 11 votes
answered by Olin Lathrop 32 votes

How to efficiently design the opcode for a CPU?

I am building a simple 16-bit CPU in Logisim and have the ALU ready and the opcodes that I want to have. Now I find it really hard to find the right coding for the commands so that the different ...

cpu computer-architecture  
asked by Benjoyo 10 votes
answered by TM90 9 votes

What's the point of a current source?

simulate this circuit – Schematic created using CircuitLab OK. So I've been told that the current flowing into the current source (that is, into the arrow's behind) is the same as the ...

current-source  
asked by David 9 votes
answered by John D 14 votes

Electrical Machines based on Electric Fields

Our teacher asked us this question during the lecture for Power Electromagnetics. We know that Electric Fields and Magnetic Fields are easily transformable into one another. And they are used greatly ...

magnetics electric-machine field  
asked by Digvijay Gusain 8 votes
answered by wbeaty 1 vote

Why is the first band on a resistor never black?

I'm taking an electronic circuit analysis class, and I was asked to give the color of the 3rd band of a 1MΩ resistor. My answer was blue, thinking it could be black-brown-blue (01 * 1MΩ), but the ...

resistors  
asked by Michael Hoffmann 7 votes
answered by alex.forencich 8 votes

Why GCC compiler omitting some code?

I can not understand why GCC compiler cutting out part of my code while it preserve absolutely the same one in the neighborhood? The C code: #define setb_SYNCO do{(PORTA|= (1<<0));} while(0); ...

avr c avr-gcc optimization gcc  
asked by Roman Matveev 7 votes
answered by Vladimir Cravero 7 votes

Greatest hits from previous weeks:

How can I tell the size of a barrel power connector?

Spring cleaning, and I'm trying to get power supplies for all my devices with missing power supplies. They're all the typical barrel power connector, and I'm having a dickens of a time trying to ...

power-supply connector  
asked by dwwilson66 13 votes
answered by helloworld922 7 votes

USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and how do they relate to each other?

As a novice electronics hobbyist, I have heard these terms and more being thrown around everywhere. At its root, I understand that they are all based on communication between devices, computers, ...

communication  
asked by capcom 48 votes
answered by stevenvh 84 votes

Can you answer these?

Best Approach Methods for Signal Processing

I'm looking for some advice, I am hoping one of the many forum experts could help me with some advice on the sampling and processing of signals. I am using an STM32F4 processor with 12 bit ADC and DSP ...

dsp  
asked by user10326 2 votes

Wiring diagram and phase number of three phase transformer

Does anybody have an idea how to draw vector diagram of primary and secondary of a three phase transformer? For instance, if I need to draw vector diagram for Yzn5 diagram and then also draw the ...

transformer three-phase diagram  
asked by jurij 1 vote

How to design controllers "properly"?

It may sound like the "easy way" to ask it here, but this question (along with a couple others I've posted which were more specific) is the result of years of research on the topic - on and off as ...

control control-system pid-controller transfer-function  
asked by Mister Mystère 6 votes
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