The standard tag has no wiki summary.
4
votes
4answers
179 views
Why should any unit be used instead of the watt (W) as a power unit?
I am taking a course on AC circuits and so far I have seen that for the different types of power (read real, reactive and complex) different units are used.
For the real power, which is power in fact ...
2
votes
1answer
107 views
Is there any standard which defines that a particular connector or header on PCB has to be male or female?
Is there any standard which defines that connector (DB9, DB25, USB or header) type has to be MALE or FEMALE while choosing one to use on circuit board?
I am designing a microcontroller circuit board ...
5
votes
4answers
418 views
How do you pronounce the following set of 'words'? [closed]
I've heard people pronouncing the following 'words' in different ways and I would like to know the correct way of pronouncing them.
SPI (spy vs s.p.i)
I2C (I.2.C vs I.squared.c)
LED (lead vs L.E.D)
...
1
vote
2answers
152 views
SSOP and SOIC standards
In theory at least, SOIC is half the pin pitch of DIP and SSOP is half again. Thus SSOP is 0.1/4 = 0.025" or 0.635mm. Except I see many parts, from TI and Linear especially, which are SSOP (or TSSOP) ...
3
votes
2answers
93 views
Inspection/QA Criteria for Selling Electronics?
I'm a software developer who has recently taken up a penchant for home electronics and personal robotics. I'd like to start building a prototype for a small device that I would sell though a website, ...
-2
votes
1answer
62 views
How to obtain safety testing equipment? [closed]
What is the best way to obtain (buy or build) mandatory safety testing equipment? Eu standards specify a "reasonable" amount of equipment in order to sell your home made equipment (selv and other ...
3
votes
2answers
301 views
Which standard dictates how reference designations should be formed in the EU?
I'm studying electronics in college (I live in Europe), and they are teaching us we should form our reference designations of elements when designing a circuit as according to EN 81346.
This seems ...
30
votes
6answers
10k views
Why was Mini USB deprecated in favor of Micro USB?
Mini USB connectors were standardized as part of USB 2.0 in 2000. In 2007, the USB Implemeters Forum standardized Micro USB connectors, deprecating Mini USB connectors four months later.
Why? What ...
0
votes
0answers
80 views
What is the exact temperature of annealing copper for power transformers coil? [closed]
This is a part of "Design of Transformers" by "Indrajit Dasgupta"
To relieve this material from stresses, it is annealed under vacuum in the electrically-heated annealing plant. The process requires ...
2
votes
1answer
86 views
Connector guide?
Are there any guides for connector choices for home electronics projects? I'm looking for basic stuff that anyone working with specific electronics might know already but others might not, like the ...
5
votes
4answers
440 views
Standard enclosure sizes?
I am working on a project and have decided that I will design the PCB so that it fits a standard enclosure size, as was suggested here. All electronics websites sell some variety of enclosures, and ...
5
votes
1answer
111 views
Is there a metric version of this nomogram?
I found this nomogram, which also appeared in an answer here I think.
(larger version here)
Is there a metric version of this?
4
votes
2answers
115 views
Industry standard Cat5e cabling
I was wondering about the industry standard for building cabling of Cat5e from the elctrical closet to the end user. More specificly from the patch panel to the wall plate.
I was told at some point ...
2
votes
2answers
653 views
Latch-up, JESD17, and JESD78
I am somewhat familiar with latchup (parasitic transistors in the body of a CMOS device that are activated by over- or under-voltage conditions). However, I have seen some devices that advertise ...
1
vote
1answer
133 views
UL 508A - Listed assembly in unlisted enclosure?
I need a UL Listed industrial control panel (cf. UL 508A) with non-standard dimensions. I understand that "508A" shops can fabricate Listed enclosures in custom sizes, but that takes extra time and ...
2
votes
1answer
183 views
Understanding the OSI Model
I'm currently documenting a wireless, microcontroller-based system that I've built and I would like to use the standard industry terminology to help anyone who comes behind me comprehend it easier. ...
1
vote
1answer
281 views
Defined LM339 behavior when the (+) input is floating
I was troubleshooting a charge indicator circuit on a tire inflator/flashlight. The green LED is supposed to light up if the battery voltage is above a certain voltage level. The LED is connected to ...
7
votes
0answers
202 views
When exactly was the RS-232 standard issued? [closed]
This year is 50th anniversary of RS-232 standard. Despite its age it is still used nowadays, and I work in company that has to deal with it.
So we have a half-serious idea to celebrate the exact day ...
1
vote
2answers
111 views
Will there be a problem if I stay almost in the border in trace spacing when dealing with line voltages?
The IPC-2221 standard shows that 1.25mm will be enough at less than 3050m at 250V (220V is the line voltage here in Turkey), even if the coating gets damaged. However, people generally recommend 5mm ...
0
votes
1answer
212 views
What LED form factor is this?
I see many LEDs for sale using this size:
What form factor is this? I want to buy empty enclosures to place some LEDs that I purchased into. I assume that their are enclosures available because so ...
8
votes
2answers
3k views
What is a digital video port?
I see a few questions here casually mention that image sensor modules have a
"standard parallel digital video port (DVP) or ... MIPI high-speed serial interface"
"Where do I start with embedded ...
2
votes
3answers
832 views
uart communication protocol
I'm working on a project where I have to communicate different lengths command from my PC to a microcontroller. (using usb to uart bridge)
I already make a litle protocol (start byte, some data, ...
6
votes
2answers
524 views
Standard nomenclature for component types
What prefixes should be used on reference designators for components of various types? I think we can all agree that "R##" refers to a resistor, "C##" refers to a capacitor, and "L##" refers to an ...
5
votes
2answers
147 views
Is there a common embedded console library
Does anyone know or of use a standard set of source files for a simple embedded console?
I've been doing embedded work for a few years now, and I have a set of console code files I have reused in ...
