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sofware for modelling 1, 2 and 3d photonic structures
hi all, can anyone suggest to me where i can get software for photonic bandgap structure simulations? cheers...
Electromagnetic Design and Simulation :: 13 Oct 2009 10:54 :: samiye :: Replies: 7 :: Views: 1050
who can give me a spice model about 8k crystal osc
i dont know how to calculate it and i cannot find it ,thx!!!!!...
Analog IC Design & Layout :: 13 Oct 2009 7:05 :: godspeed.w :: Replies: 3 :: Views: 135
plc vs microcontrollers.
i am being taught plc as a part of out course.however, i am not able to appreciate plc at all... when we have such low cost microcontrollers, why on earth do we need plcs?i read that plc programmes are easier.... how? why do we need plcs today? or ar...
Microcontrollers :: 13 Oct 2009 0:30 :: samukelo_shezi :: Replies: 12 :: Views: 2634
ne5532 versus tl072
hi,having tl072 high pass filter. but i want more crystal clear quality so decided to replace with 5532. may i do it without modifying the circuit??is it give good result?? or any other suitable and hi-fi chip available??thx...
Hobby Circuits and Small Projects Problems :: 12 Oct 2009 16:55 :: pauloynski :: Replies: 23 :: Views: 612
hole current concept
hole is a theoritical concept given by the scientists which has no actual existance. so how do we account for the hole current? can something which has no actual existance produce current?...
Electronic Elementary Questions :: 12 Oct 2009 0:09 :: snafflekid :: Replies: 12 :: Views: 738
4060 lc oscillator design
hi can any one show me how to design lc oscillator using the 74hc4060 need some schematic and frequency design formula all the best bobi...
Analog Circuit Design :: 10 Oct 2009 16:48 :: pauloynski :: Replies: 2 :: Views: 297
single ultrasonic transducer switching to rx and tx
hi,i am currently trying to figure out how to use a single ultrasonic transducer for transmitting and receiving. ive managed to do so by using a spdt switch (cd4053b), however the drawback of using this circuit is that i have to manually do the switc...
Analog Circuit Design :: 07 Oct 2009 17:12 :: FvM :: Replies: 28 :: Views: 1950
pic 18f4550 - lcd - c18
it doesnt works i duuno why plss help(crystal 20mhz - pic18f4550 - lcd backlight)#include <p18f4550.h>#include <delays.h>#include <xlcd.h>#pragma config fosc = hs,fcmen = off,ieso = off#pragma config pwrt = on,bor = off,borv = 0 #pr...
Microcontrollers :: 06 Oct 2009 11:46 :: willi65 :: Replies: 1 :: Views: 384
minimum delay using a pic?
can anyone please tell me, what is the minimum delay i can get using a pic ? i want a delay of 500ns.....please also specify the series of the pic......
Microcontrollers :: 06 Oct 2009 10:57 :: madhan7710 :: Replies: 3 :: Views: 162
generation of 500ns pulse directly from 8051.
i need help to generate a 500ns, 50% duty cycle squre wave directly from microcontroller 8051/8052/8055wd.is it possible? if yes how?thanx in advance.-yash...
Microcontrollers :: 05 Oct 2009 8:08 :: syrax :: Replies: 10 :: Views: 243
feeding data from pc to on-chip dac through uart
hi everyone, i want to send a file from my laptop to pic33fj128gp802 through uart and then pass the data to on chip dac. the file contains samples of a sinusoidal signal, which was sampled at 8038hz. i managed to write the code, which as i thought sh...
Microcontrollers :: 03 Oct 2009 19:34 :: x3.exe :: Replies: 4 :: Views: 255
problem with pic16f876a - led blink
hello everyone,i am still a beginner in microcontroller programming. i want to make led blink using a simple c code - using pic16f876a, compiled in ccs.the code is:##include <16f876a.h>#fuses hs,nowdt, noprotect, nobrownout, put,nocpd,noput#us...
Microcontrollers :: 02 Oct 2009 6:08 :: eanema :: Replies: 18 :: Views: 579
reactive load for ade7758 measurements
hi , i am currently working with ade7758 for the three phase measurements. so finally i am able to read the values for the per phase irms, vrms, active power & energy.so here for the reactive power calculations , please let me know like what type of ...
Analog Circuit Design :: 01 Oct 2009 22:48 :: Hanskarl2000 :: Replies: 2 :: Views: 349
usb to rs 232 converter
any body has usb to 232 converter circuit??....
PC Programming and Interfacing :: 30 Sep 2009 13:55 :: elrayes :: Replies: 78 :: Views: 60466
ds1302 & 8051
hi friends, i have recently designed a digital clock with calendar using rtc ds1302, 89c51 and lcd. the ciruit and program are working fine. till now i havent included the switches to set the date and time. now, my problem is, how to check whether t...
Microcontrollers :: 30 Sep 2009 12:04 :: kulkarni_sayo :: Replies: 9 :: Views: 1632
pic16f84a with lcd jhd162a and keypad 4x3(sort of)
i am using a basic to program.i will describe my problems:1) when i try to print or lcdout a decimal, it will convert to hex value and then referring to lcd character table supposed to display something? say like 6...but my lcd would display somethin...
Microcontrollers :: 29 Sep 2009 11:49 :: Shinnster :: Replies: 49 :: Views: 1944
the possibility of osillation with low amplitude
hello!i have got an abstract question a little bit. i wonder if an amplifier or another circuit can oscillate without reaching rail-to-rail amplitude if the circuit is unstable. if it is possible, do you you have such experience or could you please g...
Analog IC Design & Layout :: 25 Sep 2009 16:27 :: dick_freebird :: Replies: 7 :: Views: 258
how to interface with kid's wrist watch glass lcd?
daughter destroyed her cute litttle bunny wrist watch. well, only the plastic band got chewed. the clock was still working.so i tore it off and got the pcb out. the pcb is hardly 20 mm in dia, has a crystal, a button battery, and a glass lcd. the gl...
Hobby Circuits and Small Projects Problems :: 25 Sep 2009 8:00 :: nandiram :: Replies: 2 :: Views: 282
ad7730 problems
hi,i am trying to build a weighing system but i face some problems with the noise and the stability of the measured value. i built 3 versions of aprox the same schematics but with different layouts. with the first version i got a 14 bit resolution, b...
Professional Hardware and Electronics Design :: 24 Sep 2009 7:42 :: paurelian :: Replies: 19 :: Views: 2786
ds89c420 and ds5000(t) programmer board
this is the pcb top view layout, just resize it. i will explain it later or jus post here....
Microcontrollers :: 23 Sep 2009 9:08 :: Mar9976 :: Replies: 7 :: Views: 1368
what does ppm/deg celcius denoted when mentioned in spec.
pls explain what does ppm/celcius denotes(means) when it is mentioned in the specification of a) resistanceb) capacitorfor examplea) 200ohm,0805,+/-5%,100ppmb)27pf,0805,0 +/- 60ppm/deg celcius...
Electronic Elementary Questions :: 22 Sep 2009 17:26 :: Kral :: Replies: 2 :: Views: 219
an oscillator with multiple positive feedback
if an oscillator has multiple positive feedback paths,it oscillates at plural frequencies or at a certain frequency??...
Electronic Elementary Questions :: 22 Sep 2009 1:38 :: biff44 :: Replies: 6 :: Views: 366
attiny 2313 programming in avrstudio4
hi all.. i am working on attiny2313. from past two days i am trying to send & receive data to tiny2313 through rs232. program is very simple & i found it from net but not working. according to datasheet i have to burn the fuse, if i am using ...
Microcontrollers :: 18 Sep 2009 15:36 :: vinstudy :: Replies: 7 :: Views: 474
will there be any voltage????
do i get any voltage in the crystal oscillator connected externally to the atmega16l...when the mc is switched on.......
Electronic Elementary Questions :: 18 Sep 2009 7:34 :: FvM :: Replies: 3 :: Views: 126
need help with cmos, ttl and pierce oscillator
so heres my situation currently, im trying to build a crystal oscillator circuit that would work for a 40khz ultrasonic sensor, model ssqc sq-40t and ssqc sq-40t. ive done a decent amount of research about this but im not sure which oscillator is mos...
ASIC Design Methodologies & Tools (Digital) :: 17 Sep 2009 17:37 :: losties :: Replies: 0 :: Views: 132
switching to 3v supply of battery from lm317.
hi everybody, i am using nxp make 89lpc936 for my project. i am currently giving supply from lm317(3v). i found that my circuit current consumption is 25ma.i am using the internal crystal of ic(7.37mhz).i want to use battery(aaa size ...
Hobby Circuits and Small Projects Problems :: 17 Sep 2009 4:48 :: mandar_mahajan :: Replies: 10 :: Views: 420
need pll scheme or special solution to fit the requirements
me that works at about 2.5ghz and can lock the frequency as well as the phase within 1 us. i think maybe many plls can do this. but the special thing is that the current system use an universal 48mhz crystal and we can not apply the frequency changes...
Analog Circuit Design :: 16 Sep 2009 11:14 :: mqblue :: Replies: 2 :: Views: 264
help ! peripheral!!!
please, anybody please tell me is there any microcontroller come with a rms reading for a ac voltage?i need to do a comparation for a control refer to the rms value for few ac voltage.please help!!thank....
Microcontrollers :: 16 Sep 2009 1:02 :: frankys :: Replies: 6 :: Views: 255
clockspeed- the meaning of #ifndef f_cpu, #define f_cpu
hello, what is the meaning when we write#ifndef f_cpu#define f_cpu 16000000ul#endifat begining of a program, when my µ controller is running on external or internal rc crystal of different clockspeed. say atmega32 running on internal 1 mhz... no...
Microcontrollers :: 15 Sep 2009 18:34 :: Nahian :: Replies: 3 :: Views: 141
cheap way to lock 24 ghz signal drift?
lets say i was operating 24.0 to 24.25 ghz ism band, and the vco had a built in divide by 16. anyone have a neat way to determine if i am tuning outside of that band (drift/aging/temperature) using the divider output. can not find a cheap off the s...
RF, Microwave, Antennas and Optics :: 15 Sep 2009 0:36 :: biff44 :: Replies: 2 :: Views: 126
reason why ds1307 doesn't work with crystal 32768?
i am using ds1307but ds1307 dont work with crystal 32768?but work with any sinusoidal inputyi change crystal and ic but dont work please help me...
Microcontrollers :: 14 Sep 2009 19:41 :: sn_burki :: Replies: 5 :: Views: 177
how can i get 200 ns or more delay?
i am using pic18f252 with 20mhz crystal, i have tried to use the following program to get the delay(on/off time of led) minimum i.e. 200ns, but the delay i am getting is 5ms.please let me know what is the mistake in my program.unsigned cnt;void inter...
Microcontrollers :: 14 Sep 2009 13:13 :: issaiass :: Replies: 2 :: Views: 90
asim khan's programmer circuit - xtal question
hi! i refer to asim khans programmer circuit.hteeteep://chaokhun.kmitl.ac.th/~kswichit/isppgm30a/isp-pgm30a.htmli wanted to built one. the circuit above connect the 4mhz crystal without using capacitors. in the atmel datasheet all circuit shown requi...
Microcontrollers :: 12 Sep 2009 13:22 :: bobcat1 :: Replies: 7 :: Views: 498
about crystal osc design- waveform is not smooth
i found that the waveform of my crystal oscillator is not smooth,it is the sine waveform with ladder rise and fall. i guess maybe need some option in hspice,pls help me .i give the picture.http://images.elektroda.net/88_1252486892_thumb.jpg...
Analog IC Design & Layout :: 11 Sep 2009 8:03 :: godspeed.w :: Replies: 2 :: Views: 192
intelligent battery charger circuit
dear all,i would like to build a module of battery charging circuit, better can use microcontroller to monitor the status. is there any recommendations on those battery charging ics to acheieve the task?if yes, kindly leave the information for me.tha...
Microcontrollers :: 11 Sep 2009 5:59 :: noname1806 :: Replies: 143 :: Views: 32623
pic16f876-a problem with bootloader
sing pic16f876-a....i hv copied the following program given in mikro c examples for bootloader....bt i hv been facing difficulty in building it....void main()org 0x1e7d{ susart_init(129); //20mhz crystal if (susart_write_loop(g, r) != 255) st...
Microcontrollers :: 10 Sep 2009 14:06 :: amitdandyan :: Replies: 2 :: Views: 120
fat on mega16/avr with codevision
this is a codvision code program for fat16 or fat32 on avr microcontroller.read readme.txt file for any avr.i tested on mega16 with 16mhz crystal.enjoy it...
Microcontrollers :: 09 Sep 2009 22:59 :: Hamed.H :: Replies: 5 :: Views: 2244
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a crystal circuit problem,help!
one pin 455k osc resonance circuit: circuit description: this circuit used to generate a 455khz clock signal from 2v to 5v, the crystal one pin connects to the osc pin,the other pin connects to gnd.when the output of i128 changes from one to zero...
Analog Circuit Design :: 09 Sep 2009 15:07 :: dick_freebird :: Replies: 1 :: Views: 159
photonic crystal slab lens
hi i am simulating photonic crystal (phc) slab lenses. the structure consists of a triangular lattice of cylindrical holes with radius r=0.4a in dielectric with permittivity e=12.96. in this phc slab at frequency f=0.3, phc exhibits negative effectiv...
Electromagnetic Design and Simulation :: 08 Sep 2009 21:18 :: Sohrab_Tapar :: Replies: 0 :: Views: 105
pic kit 2 help?
hello,i recently bought the pic kit 2 debug express from microchip. i will be honest i do not know too much about this device. the problem i am having is that i cannot seem to properly program a pic16f877a(tqfp). the pic kit 2 programming software sa...
PC Programming and Interfacing :: 08 Sep 2009 3:52 :: MicrocontrollerBoard :: Replies: 5 :: Views: 582
how to generate a high-precision sine source for ad test?
i need to test a 16bits adc, but i dont have the proper sine source?is there any idea?...
Analog Circuit Design :: 07 Sep 2009 9:17 :: dmilosd :: Replies: 15 :: Views: 1056
programming related query with atmega64
i wanna know what is the role played by the crystal clock, during or soon after programming fuses..cause this happend with me:i used a brand new controller and programmed it with only fuse bits, soon after programming the fuse bits, i clicked on othe...
Microcontrollers :: 07 Sep 2009 8:02 :: sau_sol :: Replies: 4 :: Views: 222
help in program pic18f4520 in c
hii program pic18f4520 to light a led but it did not work so can any one see my program and help me if there is any wrong with it.#include <p18cxxx.h> #include <delays.h>#pragma config wdt = off//void delay_ms(long t);void main (void){tri...
Microcontrollers :: 07 Sep 2009 6:46 :: sheth_ka :: Replies: 8 :: Views: 1632
real time clock interfacing with 8051?
hi,im doing a project to display the temperature using lm35,adc0804 on an lcd.now i also want to display the time on the second line of lcd using ds12887(or any other rtc),i would like to know how to interface it since it is considered as external me...
Microcontrollers :: 07 Sep 2009 6:42 :: sharang :: Replies: 18 :: Views: 4917
interfacing rtc with 8952 code problem
helloim using the ds12887a rtc to interface with my microcontroller at89s8252.what do i need, code speaking, to interface it with my µc?do i have to inicialize it? how can i send and wright on the rtc using c?this is urgent and any help is welcomed....
Microcontrollers :: 07 Sep 2009 6:28 :: sharang :: Replies: 9 :: Views: 871
try my standalone at89s isp programmer
i built a standalone isp programmer for the at89s51/52 devices using another 89s51 and a 24lc256 eeprom to store the hex file to be programmed.the hex file and schematic is included. the hex file should work in most 8051 devices provided you follow t...
Microcontrollers :: 05 Sep 2009 12:44 :: nikunjgopi :: Replies: 38 :: Views: 6357
what crystal for a cmos inverter oscillator/clock
hi guys, im designing a cmos inverter oscillator/clock right now...when i choose for the crystal, should i choose only the crystal oscillator or any crystal would work?thanks...
Analog Circuit Design :: 05 Sep 2009 8:21 :: KS2 :: Replies: 2 :: Views: 555
1 hz cmos clock design
dear all.after spending painful times to find some info about 1 hz clock, i have finally decided to ask this to you all experts. i am using 0.5um cmos process in cadence. for my chip design in biomedical applications, i need to have a 1hz clock. by t...
Analog IC Design & Layout :: 05 Sep 2009 8:06 :: KS2 :: Replies: 20 :: Views: 1396
repair help for sony kv-2197m3
when power on the stand by led blinks 6 time only no repeat,tv is working without colour.both tv and video.changed 4.43 crystal,tda8375a,tda4665,tda8395 checked service mode also.but still same fault.pl help me...
Service Manuals, Requests, Repair Tips :: 04 Sep 2009 13:15 :: fahadzaman66 :: Replies: 5 :: Views: 718
what component is this?????
can anyone tell wat type of component is this. if possible can u also pls give the link for the datasheet..(sorry about the picture clarity)..pls helpthanks....http://img54.imageshack.us/img54/3096/photo0009.th.jpghttp://img132.imageshack.us/img132/7...
Electronic Elementary Questions :: 03 Sep 2009 23:01 :: barrybear :: Replies: 6 :: Views: 288
at89s52 microcontroller used to drive 2 motors
gentlemen and everybody,it is a really really very urgent!!!!!!!!! i know most of the people say this but i really need a solution very urgently. its a very kind request.i am new to embedded systems so kindly explain in little details as u explain. t...
Microcontrollers :: 03 Sep 2009 22:50 :: CMOS :: Replies: 14 :: Views: 603
the method to create a laser port in hfss
hi i am a new user of hfss,what would be the method to create a laser port in hfss...
Electromagnetic Design and Simulation :: 03 Sep 2009 14:24 :: iyami :: Replies: 11 :: Views: 228
pic to pc serial problem....
helloim trying to network a multidrop rs-485 network. please see the enclosed diagram of how i have made the wiring arrangement.- board a represents the pc with rs-232 to rs-485 convertor- board b represents pic board 1 with max488 line driver- boar...
Microcontrollers :: 02 Sep 2009 14:09 :: madicalphy :: Replies: 5 :: Views: 531
time delay in pic16f876-a
i have developed the following program to glow an led connected to first pin of port b using mikro c...now the problem is how can i give delay value, eg 250us etc...????unsigned short i;void main() { trisb = 0; portb = 0x00; usart_init(9600); ...
Microcontrollers :: 02 Sep 2009 12:37 :: amitdandyan :: Replies: 11 :: Views: 616
led matrix 16x40 - problem with a scrolling sentence
i need help to have tis project working. first of all i would like to say i am very new in this project.i am using pic 16f877a with 20mhz crystal osc. and hi-tech c i need to have display a scrolling message.can anyone help me . i know how to display...
Microcontrollers :: 02 Sep 2009 7:48 :: edmondren_89 :: Replies: 4 :: Views: 480
50mhz lpf - a good choice? air wound or commercial coils ?
hello i am constructing a 1hz to 40mhz broadband receiver and i need a 50mhz low pass filter for receiving only in order to attenuate the unwanted vhf/uhf. the filter needs to allow frequencies from 1hz to 40mhz to pass.i have found this http://www.o...
RF, Microwave, Antennas and Optics :: 01 Sep 2009 21:21 :: Phytech :: Replies: 6 :: Views: 285
dspic oscillator and pll question
hi,i want to run my dspic30f4011 in maximum speed (120mhz).so i choose a 7,5mhz crystal/resonator and set the pll to x16.but.. there are no 7,5mhz crystals or resonators.it seems all crystal series skip the value 7,5 mhz.ok, i choose 15mhz and set pl...
Microcontrollers :: 01 Sep 2009 12:11 :: aProgrammer :: Replies: 2 :: Views: 258
usart in pic18f4550
..i am new in pic18f4550 programming. i want to use this pic in usart at 115200 baudrate. i am having a hard time in the config bits settings and oscillator settings. i really need some help....
Embedded Systems and Real-Time OS :: 01 Sep 2009 9:04 :: cyrusdave :: Replies: 2 :: Views: 402
lowest frequency
what is the lowest transmission frequency for wireless communication ?am lowest frequency ? or can we go lower ?...
RF, Microwave, Antennas and Optics :: 31 Aug 2009 3:26 :: E Kafeman :: Replies: 10 :: Views: 444
ultrasonic distance measuring sensor using atmega32
hello,i am using an atmega32 at 5v with 16mhz crystal. i have written the code for the ultrasonic distance measurement sensor. this is the code ---#include <avr/io.h>#include <util/delay.h>#include <avr/interrupt.h>#define lcd_port ...
Microcontrollers :: 30 Aug 2009 15:34 :: rahuljin :: Replies: 0 :: Views: 658
help me to sense 220vac with optocoupler...
guys,please help me in this regard...i want to use mega8/32/128 (any one). programming will be done through bascom compiler. and all most all of the adcs will be used for some other job thus no way to use those adc. now what i have to do is, i have t...
Electronic Elementary Questions :: 28 Aug 2009 21:41 :: aq_mishu :: Replies: 9 :: Views: 679
is it possible to make xvco from lc vco ?
hi!is it possible to make a xvco from lc vco like in fig.1? to get xvco im going to replace the l by crystal.thank you!http://images.elektroda.net/48_1251119855.gif...
RF, Microwave, Antennas and Optics :: 28 Aug 2009 8:52 :: neazoi :: Replies: 6 :: Views: 314
need help in making a low jitter clock
here, but i need this rather quickly, and i need an advise on how to build it...will regular pierce oscillator do the job?if so, what should i look for in the components(key feature) esp the cmos and crystal?thanks...
Analog Circuit Design :: 27 Aug 2009 20:50 :: FvM :: Replies: 1 :: Views: 192
driver for tcb8000c color lcd of topwaydisplay
this is a program for mega16 with 16mhz crystal with codevision for tcb8000c driver card of a 3.5 color lcd.in the top of file tcb8000c.c,i mentioned used pins.i u have any question or may be problem, please dont be hesitate to mail to me....
Microcontrollers :: 27 Aug 2009 10:59 :: sherifgirgis :: Replies: 8 :: Views: 1431
mass of electron and holes-why mass of hole is more?
now, holes are created when the electrons are removed from there positions. so the mass of the hole produced and the electron removed should have been same. but it is said that the mass of hole is more than that of an electron.why? from where does th...
Electronic Elementary Questions :: 27 Aug 2009 10:35 :: snafflekid :: Replies: 9 :: Views: 546
request translight software
full name: transfer matrix method code for photonic crystalsdescription (10 lines) of the functionality of the tool.will compute the transmission and reflection coefficients of complex photonic crystalsincluding metals and user defined structures. co...
Electromagnetic Design and Simulation :: 25 Aug 2009 16:14 :: brrstvnssn4 :: Replies: 17 :: Views: 2928
rfm12b configuration...
hi all can any body help me to initial rfm12 module with bascom or codvision please????...
Service Manuals, Requests, Repair Tips :: 25 Aug 2009 2:40 :: h_farzandi2009 :: Replies: 2 :: Views: 1698
ext rc oscillator for pic?
t 4.7k and 33pf will give approximately 4mhz for pic in external rc oscillator mode. i am planning to use it.is there any consequence if we use rc oscillator in a pic based product, instead of a 4mhz crystal? accuracy is no problem as my equipment is...
Microcontrollers :: 24 Aug 2009 6:23 :: Picstudent :: Replies: 2 :: Views: 192
mplab rc5 assembly programming
i am currently working with infrared perimeter/gate that use rc5 coding. could anyone help to change the source code of decoder part in order to suite my application(ir gate/fence). what i needed to do is to continuously monitor the encoded ir light ...
Microcontrollers :: 23 Aug 2009 20:49 :: guesslsc85 :: Replies: 0 :: Views: 352
how to get precise time with pic - help needed
im working on a small project and precise time is critical issue.how can i get precise time?thank you....
Microcontrollers :: 21 Aug 2009 3:13 :: doraemon :: Replies: 24 :: Views: 554
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