IET - Electronic engineering

Philips 8051 assembler

jencam — 2013-05-21T21:53:43 00

Some embedded systems old timer might know the answers to these questions.

When did Philips first start making 8051 microcontrollers? What was the original 8051 assembler from Philips called?

Many moons ago Philips had a dial-up BBS service with datasheets and software for 8051 microcontrollers which would probably have answered the questions, but this has long since closed down.

App development

abdullabd — 2013-04-22T15:10:55 00

I am the rapidly being consumer at this time learning the device, reading manuals, the community and so on. I have screened all trial programs with a computer system plus the portable application versions/VP (LOVE Aware INTERNET MARKETING from the way). [url=http://www.abmobileapps.com/]Mobile app development[/url] I have the hint which may probably develop interesting integration choices for Aware INTERNET MARKETING along with specifically the portable version/VP.

Startup Project

MadsTrundte — 2013-04-03T15:02:50 00

Hi everyone

I am looking for an engineer who is willing to start a project with me. I want to create a hardware for DSLR cameras, unfortunately i do not have the technical expertise myself. The hardware is meant for cameras, but it has many implications in the long run. The technology is simple (I can almost do it myself), most of the aspects has been thought of and worked out. I just need a technical drawing or prototype, so i can start calculating production costs and start finding investors. The project is simple and will pay out for all parties involved in the end, however, it will be a non paid project in the beginning, until we find the necessary investors or get the sales up and running.

If you want to start this adventure with me, please inbox me or ask questions in the thread, if you know of any one interested please forward them to me.

Thank you,
Mads

safe isolation 12 step procedures

ally19 — 2013-03-15T21:47:52 00

i am currently on a nc electrical apprentiship
i am struggling with the 12 steps required to perform a safe isolation
can anyone help with any links or suggestions

thanks for any help

Extinct batteries

jencam — 2013-03-15T12:17:50 00

In my days of youth I remember that you couldn't just ask for a 9V battery. You had to specify its type because battery shelves in shops contained about half a dozen sizes of 9V batteries all in the PP family. If you ask for a 9V battery today then everybody knows you mean a PP3 although the mighty PP9 still survives but is hard to find in shops. Why did other 9V batteries like the PP6 and PP7 become extinct?

What can i do?

Richie123 — 2013-03-13T12:19:15 00

Good Morning ladies and Gentlemen,

Over the past 6 years the company i work for has sent me on a number of courses which i have been happy to attend, i have completed the courses and below are the qualifications gained.

-City and Guilds certificate of competence for the inspection and testing of electrical equipment

-City and Guilds certificate of competent management of electrical equipment

-City and Guilds certificate in portable appliance testing

-NVQ level 2 engineering maintenance and installation (electrical maintenance)

- Stoke on Trent college 70 hour electrical appreciation course

-Btec level 3 advanced diploma in electronic engineering

Now what i need to know is what i am legally certified to do within the factory?

I believe for instance i am qualified to test a 415v motor , isolate it , disconnect and reconnect a new motor and then it has to be checked by a qualified electrician before it can be run?

I realise that the qualifications i have obtained are unique to me and that is why i was hoping you guys could give a job description or point me in the right direction to find this out?

many thanks rich

Asynchronous logic

jencam — 2013-02-16T13:09:12 00

Does asynchronous logic have a commercial future - apart from small and simple systems involving about half a dozen latches - or is it just a technical curiosity? Several asynchronous CPUs have been created over the years but are they usable in commercial products in a similar way as synchronous RISC / CISC CPUs are?

Traing Course

richardbradley — 2013-02-15T20:50:53 00

Hi I manage a small team in a Quality Engineering role. My team is lacking a little bit in the electronics area and I could do with sending two employees on a week long or less basic electronics course to supplement their knowledge.
Can anyone recomend a training provider I am in the Yorkshire area but the courses seem a little bit sparse or not suitable, any guidance would be much appreciated.

PCB Mains Line E to L/N Spacing when potted?

jonrossmorgan — 2013-02-15T09:34:57 00

I am starting to layout my 1st mains (90-260VAC 1Ph) PCB that will be fully encapsulated within epoxy potting compound (PX804C Flame Retardant 18kV/mm), and obviously this is a Class 1 device. Space will be limited, so I was wondering if the epoxy insulation will allow me to reduce the 8mm E-L/E-N Spacing? There is an exposed 'Earthed' Heat sink that will protrude through the epoxy, and low voltage terminals <32VDC. I do not have a issue with the mains to DC spacing, just the L/N/E spacing. Logic would tell me that the potting would act as a very good basic insulation, with little creepage possibility, so a much smaller spacing would be allowable. I cant specifically find this situation referenced, any advice would be greatly appreciated. Kind regards Jon

calculating the parameters of the microstrip antenna

jagadishvakati — 2013-01-30T20:11:59 00

Is there any specific formulas to calculate the height of the substrate, width of transmission line, gap between transmission line and the patch??

I am trying to simulate a microstrip antenna in CST suite. And from what i have seen there are only ballpark estimates like height should be way less than wavelength and such.

Is CST the best software for doing this simulation? If no, please recommend other software.

Thank you in advance.

Working Zone And Its Importance Of Electrician In Cumming, Ga

cummingelectrician — 2013-01-22T12:53:24 00

There are times when you are building your home and you will need the Electrician in Cumming, Ga to be with you in building the connections in your home. You will need new electrical lines and the points where the lights will be and then the other connections for different appliances. You will have to show him where you would like the point for your computer and where the air condition machine is going to be connected. The extra points for lights and sockets and your music system are going to most important for you. You will need him to create the whole electrical connection points so that the wiring and the points give you the proper lighting and comfort that you planned. http://www.thecummingelectrician.com/

STR38 S M25 N1 merlin gerin breaker

BESATSAKEN — 2013-01-20T09:37:52 00

Hello fellow electrical practitioners:

I would like to post a problem on my merlin gerin breaker which rondamly trips during start of its pump load. the trip indication is always earthfault. I made insulation tests of the pumps (2 line pumps rated 7.5hp and 1 supply pump rated 60hp) and found them good with all in Giga ohms. Likewise the insulation resistance of the cables from the breaker to load is good at Giga ohms. The pumps have MCC and during the start of any pump, the merlin gerin breaker trips and no trip occurs at the MCC individual breaker. During one time the pumps are set to run, i set-up 1 clampmeter on the neutral cable to check if there is an abnormal spike during starting. I found no rise at all on the current (4 Amp but the setting for earthfault is 500 A) but there is an earth fault trip. Could it be possible that i have a nuisance tripping. I am suspecting now the merlin gerin breaker as the problem.

DYNAMIC COMPUTING

plash — 2013-01-11T12:36:10 00

share anything u know about dynamic computing just to increase knowledge about it

I badly needed help (optical motion analysis software)

eszjay15 — 2013-01-05T07:43:28 00

good day everyone!

I am an ECE student who's currently taking my thesis 1..
We found a journal titled "Imitation Control for Biped Robot Using Wearable Motion Sensor" in which they use commercial
optical motion analysis system Hi-DCam (NAC image
technology. Japan) to validate the wearable motion analysis system'
performance and compare the results from the wearable
system with the measurements.

What I would like to ask is if anyone of you knows an alternative for this optical analysis motion system that has the same function with the Hi-DCam that has lower cost.
or
if anyone of you knows a software that do the same function with the Hi-DCam..

thank you and God Bless us all..

Surely there's an app for that?

sheywood — 2012-12-28T10:58:05 00

A smartphone is now part of so many households. Surely it would make sense to build and evaluate a meter-reader app.

The other day, amazingly, I was in when the meter man called. However, he could not get to the meter across a newly laid floor. I promised him a photo, which I obtained using my smartphone after the floor had set. I sent it to him by email. Simple. He was delighted. Time, date, location (phone is GPS enabled), meter reference number, meter type and the reading. All in one familiar human readable format. With OCR it could be machine readable too.

A simple app for a smart phone which guides the householder through taking an acceptable photo and then transmits the photo to the meter reading company when in signal could deliver a high proportion of the benefits offered by a smart meter and avoid the installation costs. It would avoid hazards too it would seem.

Matrix Processing Core VHDL

devilmusic — 2012-12-24T16:24:57 00

I am doing a project called Matrix Processing Core and I had written the codes in Xilinx for it. However, the ISE could not Map,Place and Route my codes. There was no written error so I hope some one can help pin point my mistake. Below are my codes:

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity MatProCore2 is
Port ( Reset, Clock, WriteEnable, BufferSel, OP : in STD_LOGIC;
WriteAddress : in STD_LOGIC_VECTOR (3 downto 0);
WriteData : in STD_LOGIC_VECTOR (7 downto 0);
ReadAddress : in STD_LOGIC_VECTOR (3 downto 0);
ReadEnable : in STD_LOGIC;
ReadData : out STD_LOGIC_VECTOR (8 downto 0);
ReadReady : out STD_LOGIC);
end MatProCore2;

architecture Behavioral of MatProCore2 is

COMPONENT dpramA -- DPRAM A
PORT (
clka : IN STD_LOGIC; --Clock
wea : IN STD_LOGIC_VECTOR(0 DOWNTO 0); --WriteEnableA
addra : IN STD_LOGIC_VECTOR(3 DOWNTO 0); --Address Port A DPRAM A
dina : IN STD_LOGIC_VECTOR(7 DOWNTO 0); --Input DRRAM A
clkb : IN STD_LOGIC;
enb : IN STD_LOGIC; --ReadEnable A
addrb : IN STD_LOGIC_VECTOR(3 DOWNTO 0);--Address Port B DPRAM A
doutb: OUT STD_LOGIC_VECTOR(7 DOWNTO 0) -- Output DPRAM A
);
END COMPONENT;

COMPONENT dpramB16x8 --DPRAM B
PORT (
clka : IN STD_LOGIC; --Clock
wea : IN STD_LOGIC_VECTOR(0 DOWNTO 0); --WriteEnableB
addra : IN STD_LOGIC_VECTOR(3 DOWNTO 0); --Address Port A DPRAM B
dina : IN STD_LOGIC_VECTOR(7 DOWNTO 0); --Input DPRAM B
clkb : IN STD_LOGIC;
enb : IN STD_LOGIC; --ReadEnable B
addrb : IN STD_LOGIC_VECTOR(3 DOWNTO 0);--Address Port B DPRAM B
doutb : OUT STD_LOGIC_VECTOR(7 DOWNTO 0) --Output DPRAM B
);
END COMPONENT;

COMPONENT dpram16x9
PORT (
clka : IN STD_LOGIC; --Clock
wea : IN STD_LOGIC_VECTOR(0 DOWNTO 0); --WriteEnableC
addra : IN STD_LOGIC_VECTOR(3 DOWNTO 0);--Address Port A DPRAM C
dina : IN STD_LOGIC_VECTOR(8 DOWNTO 0); --Input DPRAM C
clkb : IN STD_LOGIC;
enb : IN STD_LOGIC; --ReadEnableC
addrb : IN STD_LOGIC_VECTOR(3 DOWNTO 0);--Address Port B DPRAM C
doutb : OUT STD_LOGIC_VECTOR(8 DOWNTO 0)--Output DPRAM C
);
END COMPONENT;

-------------------------STATESIGNALS-------------------------------------
type statetype is (Idle, WriteIN, ReadIN, WriteOUT, Complete);
signal PRESstate: statetype;
signal NEXTstate: statetype;
--------------------------------------------------------------------------
signal icounter: unsigned(3 DOWNTO 0);
signal iWriteInputEnableA, iWriteInputEnableB, iWriteOutputEnable: STD_LOGIC_VECTOR(0 DOWNTO 0);
signal iReadFromA, iReadFromB: STD_LOGIC_VECTOR(7 DOWNTO 0);
signal iResizeFromA, iResizeFromB, temp: SIGNED(8 DOWNTO 0);
signal iReadInputEnable, CounterReset, CounterON: STD_LOGIC;

begin

iResizeFromA <= resize(signed(iReadFromA),9);
iResizeFromB <= resize(signed(iReadFromB),9);

DPA : dpramA
PORT MAP (
clka => Clock,
wea => iWriteInputEnableA,
addra => WriteAddress,
dina => WriteData,
clkb => Clock,
enb => iReadInputEnable,
addrb => std_logic_vector(icounter),
doutb => iReadFromA
);

DPB : dpramB16x8
PORT MAP (
clka => Clock,
wea => iWriteInputEnableB,
addra => WriteAddress,
dina => WriteData,
clkb => Clock,
enb => iReadInputEnable,
addrb => std_logic_vector(icounter),
doutb => iReadFromB
);

DPC : dpram16x9
PORT MAP (
clka => Clock,
wea => iWriteOutputEnable,
addra => std_logic_vector(icounter),
dina => std_logic_vector(temp),
clkb => Clock,
enb => ReadEnable ,
addrb => ReadAddress,
doutb => ReadData
);

Global: process (Clock) is
begin

if RISING_EDGE(Clock) then
if Reset = '1'then
PRESstate <= Idle;
else
PRESstate <= NEXTstate;
end if;

if CounterReset = '1' then
iCounter <= (others => '0');
else
iCounter <= iCounter + 1;
end if;
end if;

end process Global;

Operations: process (PRESstate, WriteEnable, BufferSel, OP, iCounter, iResizeFromA, iResizeFromB) is
begin

---Default values-------------
NEXTstate <= PRESstate;
CounterReset <= '0';
CounterON <= '1';
iReadInputEnable <= '0';
iWriteOutputEnable(0) <= '0';
ReadReady <= '0';
iWriteInputEnableA(0) <= '0';
iWriteInputEnableB(0) <= '0';
------------------------------
if (OP = '1') then
temp <= (iResizeFromA + iResizeFromB);
else
temp <= (iResizeFromA - iResizeFromB);
end if;

if (BufferSel = '1') then
iWriteInputEnableA(0) <= '1';
else
iWriteInputEnableB(0) <= '1';
end if;

case PRESstate is
when Idle =>
if (WriteEnable = '1') then
NEXTstate <= WriteIn;
else
CounterReset <= '1';
end if;

when WriteIn =>
if (icounter = "1111") then
CounterReset <= '1';
NEXTstate <= ReadIn;
end if;

when ReadIN =>
iReadInputEnable <= '1';
CounterON <= '0';
NEXTstate <= WriteOut;

when WriteOUT =>
iWriteOutputEnable(0) <= '1';
if (icounter = "1111") then
CounterReset <= '1';
NEXTstate <= Complete;
else
NEXTstate <= ReadIN;
end if;

when Complete =>
ReadReady <= '1';
NEXTstate <= Idle;

end case;

end process Operations;
end Behavioral;

fluctuation in primary voltage of electrostatic dehydrator power transformer

rskad — 2012-12-22T06:25:06 00

Can any one tell me the reason for fluctuation in primary voltage of a 440V /20KV dehydrator transformer. voltage is varying from 60 to 92 continuously. is it normal ?? we have two transformers in the vessel and one is showing almost constant voltage ( 90 to 94 V ).

One led + camera = new compass

tesla22 — 2012-12-07T07:28:52 00

I wait for cooperate special universities side

I made first home test but we need start full
research (below link all detail many dyscyplines not only electronic )

I'm sorry I call this discovery because I can't find in books
similar test

1 BRIGHTNESS TEST
Led + light sensor - You can repeat in Home

2 GEOMETRY TEST
laser + light sensor

http://tesla2.blogspot.com/

BEng degree Program Duration

deleted_1_chand007 — 2012-11-29T08:13:54 00

As I could not succeed in my HSC examination, I followed the City & Guilds technician programs.
Since these exams offered by City and Guilds were able to be taken by anyone simply by privately applying and paying the examination fees. I completed both the Diploma and Advanced Technician Diploma in about 6 months. After the completion of these two programs I joined an affiliation of the Coventry University for the Final year of BEng. (Hons) Electrical & Electronic Engineering program. Now the duration of the total degree program is about 1 1/2 years and now i sense a problem might arise finding employment.

I need some ideas to get out of this mess......

Passing DC through a fuel

adambalkan — 2012-11-22T20:00:47 00

I am looking into theoretically passing a DC signal through a tank of fuel to measure the electrical characteristics. It will be a low current signal (micro controller) with a voltage of 5 volts. Is there any advantage to using AC for such purposes, for example like capacitive level sensors?
Any help appreciated.

Every Joule Counts - Energy Efficient Embedded Software Event

rkennedy — 2012-11-06T16:27:33 00

NMI (the trade association representing the UK Semiconductor, Microelectronics and Electronic Systems Communities) is running an event this Thursday 8th Nov on "Energy Efficient Embedded Software - Every Joule Counts" - it's at Intel in Swindon.

We have a few places remaining. More details including registration are on the websitewebsite. There is no charge to attend.

Robin Kennedy

Oscilloscope shows extreme variation in frequency

ubercool — 2012-11-06T06:18:28 00

Hi I am using a Hameg HMO3522 Oscilloscope. I wanted it to display a 350Mhz RF which I was giving through my Rhodes and Schwarz signal generator but the scope is showing extreme variations in frequency from 9kHz to several Mhz, even the voltage is not being displayed correctly although I performed the probe adjustments etc.

What could be the problem?

HNC-EEP-TMA-3 Q-5

ravirox2 — 2012-10-09T14:41:44 00

Hey im currently on my EEP HNC Module. I am havin some probz wit the above mentioned question....Any assistance i would deff appreciate. Its dealin wit Fourier Series & a waveform

Ravi

Roles with Health & Safety Executive

samkemp — 2012-09-26T14:42:07 00

Apparently the Health & Safety Executive have lots of jobs for people with engineering skills. Might be worth having a look.

www.safefutures.co.uk

Final year project

Zulqarnain1 — 2012-09-20T19:51:40 00

hi everybody...!!
im zuqlarnain from pakistan and currently selecting the final year project and ive choosen the project which controls the movement of weight means if the motor or car face the jumps ,,,the surface which carries the weight doesn't move and holds its position,,i just want to ask u that is this good project? will this help me in the future..?
any answer will be appreciated
THANKS

selection of university for MSEE

Zulqarnain1 — 2012-09-20T19:47:07 00

hi everyone,,im just about to take admission in bradford university for master in electrical and electronics engineering,can any one tell me the scope of this university in industrial or work field because il go direct for job,,,is it the better idea to do master in this university,,,!
All answers will be appreciated..
THANKS

Residual Current Calculation...

tech77 — 2012-09-04T14:53:55 00

Hello,

I am calculating residual current from 3 phase sinusoidal ,50 Hz current signal using on chip 12 bit ADC(of micro controller).Three phase currents are accurately measured.But I am getting quite good amount of residual current value( even at 2 Amp current) while 3 phase current are balanced ( both in magnitude & angle).I am using simple vector sum method to get the residual current form ADC count ( r, y, b phases).Samples are taken at a interval of < 200 uSec.

Plz share if you have any algorithm or better technique to resolve this issue.

Thanks & regards.

Tech7

JFET Guitar Amplifier Advice

amillar — 2012-08-21T12:29:59 00

I'm building a simple JFET guitar amplifier for home - just an impedance buffer really so that I can plug guitars straight into the mic input of my mixer. Most circuits I can see on the web are common source amplifiers but with no bypass capacitor on the source resistor. Although I'm not an expert on discrete circuits (to put it mildly!) wouldn't a source bypass capacitor be a good idea? Or doesn't it make any difference in practice? Anyone here got any experience?

See, for example, the circuits at www.till.com

Thanks,

Andy

TOTO

caolll — 2012-07-25T07:18:06 00

TPOPTT[PTOTTPT[PT

Do I need a Load Resistor?

safortune — 2012-07-12T15:50:11 00

Hi all,

I don't fully understand the purpose of load resistors and could do with some advice...

I have a detector (which contains and amplifier) which has an output load resistance of 50KOhm. This feeds into a potential divider of R1 = 1M and R2 = 33K, and then into a series of op amps.

Do I need to include a 47KOhm load resistor (connected to ground) before the potential divider? If so, why?

Thanks for your help.

SF

Fiber Network Card Parameter Explanation

fiberpcs — 2012-07-09T08:59:06 00

Second-generation Gigabit fiber network card (green card) is really a new generation of fiber network card optimized as well as enhanced based on the actual first generation of fiber network card (red card).
The actual enhanced areas of second-generation Gigabit fiber network card tend to be the following: general design realignment, help the serdes information wiring rules, substitute the actual original photoelectric controller, as well as boost the efficient power management controller. It's overall performance, balance as well as dependability tend to be much better compared to the first generation fiber network card.
The actual fiber network card may be the well-liked title associated with the fiber-optic Ethernet adapter, it's English name is Fiber Ethernet Adapter. It's a good Ethernet adapter (NIC) having a fiber optic cable like a tranny moderate. Fiber NIC card, together with RJ45 (electrical) offers numerous specs, such as PCI, PCI-X, PCI-E; Fast, Gigabit, 10 Gigabit; SC, ST, LC a number of specs, could be flexibly put on various events. And also substitute the initial cable, in order that the transmission distance is actually as much as 2KM-110KM range, based on the policy of national triple play "Light of Copper" development trend, the fiber network card will be much more traditionally used as well as well-liked.
Fiber network card are normally applied in telecommunication industry. Normally, fiber network card work with E1 to RS232, SFP transceivers, Patch cords,fiber to ethernet media converter and other related products.

can some one tell me what this circuit is for

nathan667 — 2012-07-08T02:17:45 00

the link to a picture of the circuit can be found here https://www.dropbox.com/s/o30suhy2wdzi7ap/202296_10151238017579115_1380908519_o.jpg

Advice on Year In Industry or Masters?

Mawdsley87 — 2012-06-13T22:54:59 00

I have currently just finished my second year of my BEng Electrical Engineering degree and have been accepted onto a year long industrial placement which is due to start late August/early September. However I am a mature student and I am nearly 25 would the extra year be better spent doing a masters degree as I aim to become chartered or would employers prefer the experience that the year in industry provides?

Before going to university I did complete an apprenticeship and became a qualified electrician and have several years work experience in this field. Any advice would be greatly appreciated.

Electrician -> Electrical Engineer

jameswsblackburn — 2012-06-09T09:28:16 00

I am currently half way through my Electrical Installation Apprenticeship, after i have completed this i would eventually like to be qualified in electrical engineering. I know there is a set courses to become one, However i really don't have any clue what courses you need or anything! i was just wondering if anyone could enlighten me or let me know if there is any night courses i could do to help me become qualified? or if you have made the change from electrician to engineer could you possibly share your career path? i live in the south east of england if anyone knows any courses around this area.
Thanks.

Test Equipment Accuracy

Lorna — 2012-06-01T14:22:48 00

Hello

I'm trying to understand the accuracy of a PAT tester which states the resolution, % and digit tolerances of individual test types.

My calculations are below for a hypothetical test and I would be very grateful if anyone could tell me if I'm doing right.

Resolution = 0.01 (2dp)
Accuracy = ±5% ±2 digits

Test Reading = 15.50

Step 1:
Determine the % tolerance
15.50 * 0.05 = 0.775

Step 2:
Round to 2dp = 0.78

Step 3:
Add the digit accuracy to least significant figure

= 0.78 + 0.02
=0.8

Therefore for a reading of 15.50

± 0.8 (5.16% of 15.50)

Upper limit = 16.30
Lower limit = 14.70

Thanks for your time :-)

Lorna

Soldering Crimp connections

marvo32 — 2012-06-01T10:34:53 00

I work in a plant where we have a PSU supplying 5V 200A DC to an electronic circuit, the connection from the PSU to the electronics is fed via a heavy duty multistrand cable, this is crimped at both ends. The electronics is very sensitive to volt drop so in order to improve stability it has been suggested that the cable is re terminated with crimps, and then the crimps soldered.

I am sure that this is not recommended but I cannot find the information anywhere to confirm this, can anyone on this forum offer me any advice?

Many thanks

micro SMD

safortune — 2012-05-23T10:20:50 00

Hi there,

I have found a product that I was wanting to use in my circuit but then realised the package style was WLCSP or micro SMD. I have never encountered this style before and was wondering what considerations there are when using this on PCBs?

I.e. would the PCB manufacturing process have to be altered?
Can micro SMD be used alongside normal SMD?
What are the advantages and disadvantages of micro SMD?

Many thanks,

Steve

TOXIC software TRAP (ACTA)

gordon.s1 — 2012-05-16T17:40:42 00

Not having seen anything in Forums,
I thought that we should all be aware that our Gov and EU are voting in June to implement or not the Anti-Counterfeiting Trade Agreement (ACTA).
This item will affect all software and internet users !.
It could make many of us and our children CRIMINALS !.
I urge all readers to contact their MEP's to say NO to ACTA !.
More info at www.laquadrature.net/acta.

Another concerned user, especially as my RaspberryPi is late.

Advice on Final Project of Electronic Engineering

Zulqarnain1 — 2012-04-25T17:03:49 00

i am just close to give final project presentation and i am still confused in selection of final project,,can any body help me to choose any good design which includes programing like C++ and also some electronics,,il be thankful to you all.
Thanks.

Zulqarnain Azam
(IEEE , IET Member)

Advice on becoming an electronics engineer.

notepad2608 — 2012-04-17T22:58:52 00

Hello,

Does anyone have any suggestions on possible routes into a career in electronics engineering?

I am a physics graduate so I would like to do an MSc in electronics or perhaps embedded systems.

At present my personal circumstances mean I can't give up work to study full time and my current employer wouldn't allow day release to study part time as it is not relevant to their work.

My plan is to gain a qualification, of any standard, via evening/distance learning that will allow me to get a job within the electronics industry relatively quickly. Once in the industry I hope it will be easier to negotiate day release to study an MSc.

Any suggestions or comments would be greatly appreciated.

Thanks.

RF drivers

ubercool — 2012-04-14T21:02:49 00

Can anybody tell me what are RF drivers? What are they used for?

looking for help !

paul74 — 2012-04-05T12:50:35 00

hi i am looking for somebody to help me develop a prototype mini motorized device , it will need a basic level of programing as-well hence topic summary , i will pay for the build materials as parts needed will be quite cheap !,the target market for the device is the energy companies i know its a long shot but if anybody is interested and are in the UK please get back to me thanks Paul .

2 Pole High Pass Filter

safortune — 2012-03-27T09:02:11 00

Hi all,

I have a circuit that has 2 high pass filters and low pass filter all cascading. I can work out there individual cutoff frequencies to be HPF1 = 1.44Hz, LPF1 = 160kHZ and HPF2 = 1.6Hz.

My first question is, if I have a 8Hz sin wave how much will my signal be attenuated by after passing through the three filters? Is there a simple calculation for this?

It is the cascading effects that are confusing me here I think: I would say that the two high pass filters should be multiplied together so that 0.707 and 0.707 would give me an attenuation of 0.5 of the voltage is this correct?

Any and all advice would be much appreciated. Thanks in advance.

regards,

Steve

Attenuating AC signals

safortune — 2012-03-15T11:06:48 00

Hi, apologies for asking such an easy question, however, I was wondering if you can use a voltage divider to attenuate AC signals as well as DC?

If yes, what are the advatages of using an attenuator chip over a crude voltage divider (if any)?

Any and all help/information would be much appreciated...

Thanks,

Steve

Calculating Is and nVt for Silicon Diode, How?

CDTOE — 2012-03-15T09:16:49 00

Hello, everyone!

I was asked by my lab instructor for an Electronic course to conduct a diode experiment by which I can get the value of (nVt) and saturation current (Is) for that diode.

I did the experiment by connecting a DC power supply in series with a forward-biased silicon diode (1N4007-MIC), and a 1Kohm resistor. I took voltage reading across the diode starting from 10V DC supply, down to 1V. Now, I have the readings, plus I calculated the diode current (ID) for each -1V difference in DC supply. Also, I graphed a curve of I-V characteristics.

Well, I understand that to get the value of nVt and Is, I have to take two values on that curve, an upper value of VD(V2) on the horizontal axis corresponding to an upper value of ID(I2) on the vertical axis, and a lower value of VD(V1) corresponding to a lower value of ID(I1). I take these values and substitute in the equation:

V2-V1=2.3nVt log(I2/I1) --> From this, I can calculate the only unknown value which is nVt.

I take the resulting value and substitute in the equation:

I=Is e^(V/nVt) --> From this, I can calculate the only unknown value which is Is.

So, my question is, is my understanding to how to get the two values correct? is there any shorter and easier way to get them?

Also, where can I find the the two values in the diode's datasheet? I looked up for it but didn't find any indication of it (this datasheet for example).

Thanks.

Using the PCI Express Bus

AlanSellers — 2012-02-23T11:59:32 00

Hi,

I am trying to interface some custom electronics with an x86 processor using a PCI express bus. The custom electronics uses an SPI bus and I need some sort of bridge between this bus and the PCI express bus. Has anyone got any experience of this sort of development? I am keen to move away from FPGAs but have a feeling that this might be part of the solution.

Kind Regards,

Al

How to get code coverage for embedded C code ?

kushigowda — 2012-02-22T08:20:09 00

I'm working as trainee in QA dept, here i am supposed to get the code coverage report for embedded C code written by our developers. I have installed CYGWIN tool and ECLIPSE IDE , where i have learnt to get the code coverage report for simple C programs , but i'm getting so many errors as i tried with embedded C code .
I know some of the commercial tools are available to get code coverage for embedded C , but here i am allowed to use only CYGWIN tool ( GCC ,gcov ).
So please , can any one help me out to get code coverage report for embedded C ?
Any suggestions given related to this topic would help me a lot.

How to tell the difference between an IR Tx and Rx diodes

TCSC — 2012-02-16T15:52:46 00

I've got some IR diodes and I have forgotten which are the Tx and which the Rx. They are in the standard plastic LED 10 mm package with no identification. Some are purple transparent and the others clear. I don't know anything else about them.

Anybody know how to tell which is which in a simple manner such as ohm check or Vd ?
Cheers

DSP employability prospects

basilio — 2012-01-31T07:31:04 00

Hi to all of you! I have a Bsc on electronic engineering and I'd like to attend a master course on DSP but as I have noticed, there are too many universities in England offering such a course, subsequently too many DSP engineers are going to exist in the marker during the next years,
so I suspect the competition will be huge in the dsp market.

What's your opinion on the DSP employability prospects during the next 5 years and what university has the best reputation in the market regarding
the DSP field?

Thank you.

How to become a electronic engineer?

Richie123 — 2012-01-25T08:11:01 00

Hi there,
I have been offered a role in our company to train as an electronic engineer. What i dont know is the best route to take? i have seen a course titled BTEC level 3 advanced diploma in electronic engineering which is online and with work an a young family its flexibility appeals. Does this sound like a good place to start?? I have little electrical an electronic knowledge but only aknowledged in the form of a 70hr appreciation course at college and a NVQ level 3 in electrical maintenace.

thanks rich