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how to put a better rtc for a controller ckt
hi iam looking for making a external rtc for the rabbit 3000 microprocessorcan any one suggestbinu g...
Microcontrollers :: 11 May 2004 12:21 :: psubiaco :: Replies: 4 :: Views: 387
needed:ultra low cost 433mhz tx circuit
hi all!!!! i need to construct an ultra low cost (less than us$2.50) transmitter. 0db output power, ook modulated, stable (maybe saw stabilized), 433 or 432 mhz, 2.5 to 3.3v power supply. need only the tx circuit (the modulation signal comes ready...
Hobby Circuits and Small Projects Problems :: 09 May 2004 16:56 :: flatulent :: Replies: 2 :: Views: 717
8051 and hyperterminal
has anyone tried/made a program of using the 8051 to work witht hyperterminal?say for example you have a prompt then command the 8051 to turn on or turn off a device?thanks....
Microcontrollers :: 02 May 2004 5:54 :: glenjoy :: Replies: 7 :: Views: 852
icd1 problem!
i made icd1 and if i upload firmware with programmer it works.but cant update firmware by ccss icds.exe, it start update and say:cannot start firmware reload: an unexpected response d0, need b1if i upload bootloader by programmer still update firmwar...
Microcontrollers :: 29 Apr 2004 9:54 :: petarpav :: Replies: 3 :: Views: 393
how to detect clock frequency?
does anyone know how to detect the clock frequency, distinguishit whether it is below or above 10mhz within +/-10% deviation ?i need all the components on chip and operating current aslow as 50ua.any suggestion?...
Analog Circuit Design :: 21 Apr 2004 15:59 :: Vitamin-C :: Replies: 10 :: Views: 690
programmable timer with pic 16f877
hi all,my name is patrick. this is my first time in this forum. i ve just bought a pic 16f877. wow, so exciting, and i wanted to build my own first application. well, i dont know if it is feasible or not, because i am a newbie in this field! :( ok, ...
Microcontrollers :: 20 Apr 2004 14:46 :: patrick :: Replies: 0 :: Views: 747
fl2.24 how to repair
philips fl2.20e int sound from rh spkr bad joints speaker cable philips fl2.24 nvm write protection enabled message on screen. startup problem or nvm write protection enabled message on screen after replacement of nvm (st24c08cb1; 4822 209 32283) wit...
Service Manuals, Requests, Repair Tips :: 19 Apr 2004 12:06 :: j.papirus :: Replies: 0 :: Views: 2364
very small pcb for a pic
i have to design the simplest pcb as possible for a pic16f876a to use two pwm outputs. i think i only have to use a voltage regulator, the clock circuit and the reset circuit. the problem is that the components of these circuits are too large. the la...
Microcontrollers :: 19 Apr 2004 8:05 :: gam :: Replies: 5 :: Views: 588
pic16f876 sends corrupt rs232 data
hi,i made my serial cable and i saw the first lines that my pic was printing=> how beatiful :flasingsmile:i then added longer text messages and i saw that my pic had big problems to send them ... at the other end of the rs232 connection these senten...
Microcontrollers :: 16 Apr 2004 14:54 :: Humber555 :: Replies: 13 :: Views: 2958
which are the best 16-bit mcus?
hi guys,we are looking for :- a 16-bit mcu; - support usb2.0, soc or psoc embedded, or some other advanced features added are preferred.and pls recomemded the corresponding ide or complier.comparison, discussion between mcus are welcomed!!!!!! br :w...
Microcontrollers :: 15 Apr 2004 8:23 :: kekon :: Replies: 14 :: Views: 1122
narrow band fm crystal driven rx
i used the mc3362dw but unfortunately this chip does not exists anymore.. how would one construct a narrowband fm crystal driven receiver ? (1.8 to 5 volts power supply)any suggestions welcome. 8)why is double posting occured ?? i dont know ! anyways...
Hobby Circuits and Small Projects Problems :: 14 Apr 2004 20:23 :: vfone :: Replies: 5 :: Views: 768
temperature measure
i need a schematics or info about ic or other system for measure temperatures with a precision of 0.2 degrees c...
Professional Hardware and Electronics Design :: 12 Apr 2004 21:22 :: mgajo :: Replies: 33 :: Views: 6787
unistall linux
i have serious problems with my linux distribution. could anyone plz tell me how will i erase linux from my pc?...
Linux Software :: 12 Apr 2004 3:48 :: shucai :: Replies: 19 :: Views: 2824
how to fix "timestep too small" error in hspice si
anyone know which options will help to solve this problem?...
Other Design :: 02 Apr 2004 20:25 :: maxwellequ :: Replies: 12 :: Views: 9134
rf problem
hi:i recently take part in a rf project. there are two many problems.1. i want the read distance about 6 meters. the antenna must be in a pcb and low power comsuption. and it will be used in vehicle access(near the metal). if it is possible to rfpic ...
Microcontrollers :: 02 Apr 2004 15:48 :: HeiFelix :: Replies: 4 :: Views: 414
tv tuner pll
a question regarding tv channel synthesis.we take for instance a pll tv tuner using the tsa50xx series of chips.most, if not all, have a 4 mhz clock.the divisor is 512 (taken from the datasheet) which produces a 7.8125 khz (4.000.000/512) reference....
RF, Microwave, Antennas and Optics :: 27 Mar 2004 15:56 :: sda :: Replies: 2 :: Views: 597
overtone crystal oscillator
hello,can any crystal oscillator be tuned to its harmonic frequency. or is it just for special crystals?...
RF, Microwave, Antennas and Optics :: 17 Mar 2004 17:26 :: flatulent :: Replies: 3 :: Views: 1680
no one know how to make our own icd2 like icd1 in the past??
i have shearched long time for this because i am not a professionel who can give 200$ (eur) :( for this.any one can help me? :cry:...
Microcontrollers :: 17 Mar 2004 6:24 :: Taro :: Replies: 38 :: Views: 10900
liquid crystal e-book, manufacturing information request
i am working on a coating maching for manufacturing color filter array for tft lcd display. if anyone has paper, links, or e-book on liquid crystal particular the color filter please post it here or send me private mail. many thanks! :d...
Mathematics & Physics :: 10 Mar 2004 6:00 :: Cathay :: Replies: 0 :: Views: 776
pic crystal osc2 to drive a cmos input ?
hiany has experience to drive a cmos input (or mosfet gate ?) with osc2 pin (pic xt or lp crystal oscillator) when we need another clock in the harware ?...
Microcontrollers :: 08 Mar 2004 14:20 :: C-Man :: Replies: 3 :: Views: 402
how to reduce the frequency offset?
anyone could give me some idea about the reason of frequency offset and how to reduce it?...
RF, Microwave, Antennas and Optics :: 27 Feb 2004 1:37 :: mckinson :: Replies: 6 :: Views: 681
req: digital volume control.
anybody can help please....
Hobby Circuits and Small Projects Problems :: 23 Feb 2004 17:34 :: preda :: Replies: 12 :: Views: 3867
fractional interpolation/decimation filter implementation
how do i implement a fractional interpolation/decimation filter in hardware? i know how to do an integer interpolation/decimation filter (by using polyphase filters), but dont know how to do a fractional one without overspeed. for example, to convert...
Professional Hardware and Electronics Design :: 13 Feb 2004 6:46 :: divan :: Replies: 14 :: Views: 2747
hall sensor simulation ??
how to simulate hall effect ?thanks...
Mathematics & Physics :: 26 Jan 2004 16:51 :: GrandAlf :: Replies: 7 :: Views: 2216
pic developmentboard
dear elektroda familylet me introduce the primekit pic development board ii.first, here is the link:http://www.primetec.pt/products.php?sec=2&cat=1&prod=6&lang=enorhttp://www.primetec.pt/index_en.phpprimekit pic devboard ii is a developme...
EDA Jobs, Promotions, Advertising :: 19 Jan 2004 23:56 :: asena :: Replies: 0 :: Views: 1520
2bit programmer (www.emicros.com) for pic 16f87x ???
i built the 2bit programmer (www.emicros.com) but i didnīt have sucess to programmer a pic 16f877.if somebody has built this programmer, please, send tips...thankslazaro...
Microcontrollers :: 14 Jan 2004 15:27 :: tgq :: Replies: 5 :: Views: 1412
charge pump design
i want to design a charge pump for a pll i want to know how to determine the value of current sources the phase detector constant = i/(2*pi) is the value of current source is this i plz help thnx...
ASIC Design Methodologies & Tools (Digital) :: 14 Jan 2004 8:15 :: honey :: Replies: 11 :: Views: 1928
24c02 i2c incircuit data recovery
hii would like to read ( in ascii) the 24c02 eeprom using i2c protocol while its in the circuit, may be using some kind of logic analyser.kindly give me hints how to do it or any links will be greatly appreciated.thanks...
Other Design :: 11 Jan 2004 12:56 :: chris1952 :: Replies: 3 :: Views: 2991
text-to-speech chip
hi,anyone worked with the winbond chip wts701. it is suppose to translate ascii stream to speech. it is to be used with a microcontroller.just wondering is anyone used id and can give me some feedback on its performance. :sm16:...
PC Programming and Interfacing :: 10 Dec 2003 11:22 :: Fragrance :: Replies: 9 :: Views: 1805
how to measure the floor noise level in the pcb?
hi all: i am designing and debugging a rf/digital/analog mixed signal pcb board,but the performance is not very good,we doubt the pcb noise has some effect on the tx/rx performance, but i dont know how to measure the floor noise level in the pcb, ...
PCB Routing & Schematic Layout software & Simulation :: 09 Dec 2003 10:48 :: shaw :: Replies: 12 :: Views: 1640
simple question about 8051 atmel core
hi friendscould you tell me how many clock cycles per instruction are for this processor. if it is variable length what is a good average?:=) thanks me and gil. nebisman...
Microcontrollers :: 05 Dec 2003 15:36 :: ME :: Replies: 13 :: Views: 1973
is it possible to build clock generator only with cpld?
hi,all is it possible to build the clock generator only with crystal,cpld and some capacitors and resistors?thanks!...
PLD, SPLD, GAL, CPLD, FPGA Design :: 29 Nov 2003 16:39 :: Mentor2003 :: Replies: 6 :: Views: 1558
avr spi help
hi,i first time try to work on avrs(atmega64).when try to program it with bascom11173 and stk200. it looks it work only first time, when i do some changes in fuse bits it then never again be connected/detected.now the device is no more detected by ba...
Microcontrollers :: 24 Nov 2003 7:29 :: sadat007 :: Replies: 9 :: Views: 1392
help for pic to pc rf link
hii need to connect my pic project board to my pc using rf link. for that im looking for a good transmitter & receiver circuit. pls i need help..thank you....
Microcontrollers :: 22 Nov 2003 18:59 :: abb652 :: Replies: 13 :: Views: 2437
please help!! config clock source with atmega 16
try to program it using stk200/300 compatible isp cable. it program ok but chip atmega16 was work veryslow. then i read the data sheet it said that default clocksource is internal 1 mhz osc. (i used crystal 8 mhz) so i need to changed fuse bit to ma...
Microcontrollers :: 21 Nov 2003 23:39 :: ME :: Replies: 3 :: Views: 851
tele quarz gmbh
who can post their software : tqslib.exeis it good?okguy...
Other Design :: 20 Nov 2003 7:53 :: AL0117 :: Replies: 2 :: Views: 1047
difference between timemill & starsim
can anyone tell me whats the difference between timemill (synopsys) & starsim (avanti)? after all, starsim belongs to synopsys now....
ASIC Design Methodologies & Tools (Digital) :: 13 Nov 2003 1:16 :: linuxluo :: Replies: 3 :: Views: 964
help icd-s + ccs c firmware
hello.i have mounted the icd-s free to 20mhz that i view in one of links of elektroda: http://www.piclist.com/images/com/multimania/www/http/silicium31/electronique/pic/free_icd_en.htm, i am using it with the firmware icd of ccs version 1.15 rev#32 ...
Microcontrollers :: 12 Nov 2003 23:38 :: CAPELO :: Replies: 5 :: Views: 1121
[req] die datasheet of sram km6164002a
hi,im looking for the die datasheet of sram km6164002a. at www.chipsupply.com they have one, but there is only a technical drawing without any pinnames. and because of the die has more pins than the standard package, i dont know the function of the o...
Professional Hardware and Electronics Design :: 08 Nov 2003 19:27 :: dainis :: Replies: 5 :: Views: 279
pic16f628 int osc
i would like to migrate from 16f84 to 16c628 for the extra pins available, but am not able to find any data of osc accuracy or stabilty in internal 4 mhz mode. i tend to use serial comms up to 2400, and am a bit concerned about long term performance....
Microcontrollers :: 03 Nov 2003 17:36 :: GrandAlf :: Replies: 4 :: Views: 979
square wave vfo....
hi alli am fiddling with some direct conversion receivers. my question is this: i want a try using a tayloe detector. for this i obviously need a vfo. most of the designs i have seen use a dds to achive high resolution tuning, but i was wondering if ...
RF, Microwave, Antennas and Optics :: 28 Oct 2003 15:24 :: twinsen :: Replies: 2 :: Views: 823
kind enough to tell me something about clock design,please.
i am a beginner. i am design an high-speed ad converter project.i need a 8mhz clock and then divide it to 4mhz.introduce some methods or some clock chips.thanks a lot....
Hobby Circuits and Small Projects Problems :: 21 Oct 2003 14:33 :: echo47 :: Replies: 1 :: Views: 316
ladder crystal filter design
hi all !!where i find some information about ladder crystal filter design ??i need how to calc bandpass, insertion loss, impedance (input and output)...etc.thanks in advance.best regards jackrs 8)...
RF, Microwave, Antennas and Optics :: 17 Oct 2003 14:25 :: pool_77 :: Replies: 2 :: Views: 1915
deterministic jitter in hspice
how to measure deterministic jitter in hspice?...
ASIC Design Methodologies & Tools (Digital) :: 07 Oct 2003 4:37 :: cikyen :: Replies: 2 :: Views: 1046
pic crystal oscillator question
hi,i just want to know if a pic16f84-04p or pic16f628-04p oscillator will work with 8mhz crystal if the oscillator fuse is set to _hs while programming? :roll: regards...
Microcontrollers :: 03 Oct 2003 12:01 :: Fragrance :: Replies: 2 :: Views: 823
interfacing a usb flash drive with rs232
i need to interface a microcontroller based board equipped with a rs232 to an usb flash drive memory. is it possible to use a rs232 to usb coverter to read/write flash memory? if yes, do you know how to write fat files using commands from rs232?thank...
PC Programming and Interfacing :: 03 Oct 2003 5:21 :: vkchau :: Replies: 7 :: Views: 1639
40mhz crystal works on 13.33mhz?
i would like to make the mcu w77e58 work on 40mhz, but my oscilloscope show the crystal works on 13.33mhz, why?anyone can help me how to solve it? thanks!...
Microcontrollers :: 12 Sep 2003 13:44 :: sick_man :: Replies: 11 :: Views: 1719
q: input band-width of adc
tis product ths1040 has a sample rate of 40msps(max) and analog input bw of 900mhz. but according to nyquist sampling theorem, the sampling frequency must be at least twice the signal bandwidth. does analog input bw have any significance in this case...
Hobby Circuits and Small Projects Problems :: 03 Sep 2003 15:42 :: artem :: Replies: 11 :: Views: 1553
pic icsp problem.
hi,when i try to programming my pic with icsp, i got this message:program memory errors. i use pro mate ii to programming pic16f76. and i connect those signal to pic: rb7, rb6, ^mclr/vpp, vdd and vss.does some of you any suggestion? thanks in advance...
Microcontrollers :: 29 Aug 2003 16:12 :: betanorm :: Replies: 5 :: Views: 1947
at90s8515-8 at 3.3v ???
hi all, atmel specify that there at90s8515-8 avr device will run as low as 4v, but my question is will it run at all from a 3.3v supply if run at at lower speed maybe ??? i know the at90s8515-4 will run fine at 3.3v as it is specified as so, but ...
Microcontrollers :: 28 Aug 2003 10:15 :: TheHungry :: Replies: 4 :: Views: 524
problems getting pic 18f252 to work!
hi! ive been trying to put a 18f252 to work without success. using a crystal of 4mhz the pic oscillator (osc2) only starts if i use oscillator mode hs. is doesnt start with xt mode. even using hs mode the pic only works if i touch with my fingers i...
Microcontrollers :: 28 Aug 2003 0:44 :: rsmatias :: Replies: 2 :: Views: 537
bluetooth rf transceiver and baseband controler borad design
who know which chip should be used to complete a module with above functions ?thx....
RF, Microwave, Antennas and Optics :: 27 Jul 2003 16:48 :: Velund :: Replies: 50 :: Views: 5144
problem wth remote control circuit design
hi allim trying a student project on remote control circuit. (i dont know much about rf designs). the transmitter circuit ive attached here has some errors which i want someone to correct for me.i guess the major error is in the antenna matching sub...
RF, Microwave, Antennas and Optics :: 24 Jul 2003 20:56 :: Borber :: Replies: 11 :: Views: 725
can anyone recommended my a good hazard analysis tool?
hi,i need to hazard analysis software of a project. is there any good tools you can recommended me? thanks a lot!best regards,ltg...
PC Programming and Interfacing :: 20 Jul 2003 4:08 :: WYFChina :: Replies: 1 :: Views: 520
dielectric layer losses
this question goes to all em wizards. lets say we want to simulate and find out what should be the transmission/reflection loss of one or multiple dielectric layers. which em simulator do you think will easily do the job and how would you set the fol...
Electromagnetic Design and Simulation :: 14 Jul 2003 10:04 :: totokevin :: Replies: 20 :: Views: 3110
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a design to detect phone busy tone
i need to design a circuit to detect the signals coming to the phone,when the other line is busy,or no body answers.....any help?...
Hobby Circuits and Small Projects Problems :: 10 Jul 2003 16:31 :: artem :: Replies: 6 :: Views: 2185
[b]golden dedector[/b]
everyone ..helloi need schematics for an working golden ore metal dedector.thanks....
Hobby Circuits and Small Projects Problems :: 10 Jul 2003 2:35 :: sick_man :: Replies: 3 :: Views: 2999
wireless mouse
can someone please give me a run-down on the rf part of the cordless mouse (computer mouse that is).what frequency?what modulation method?if there are more than one wirelss mouse in the same area, how do they prevent one mouse from transmitting to a...
RF, Microwave, Antennas and Optics :: 08 Jul 2003 11:19 :: Phil woz ere :: Replies: 5 :: Views: 455
csr plug and go rom based chip
it would appear that csr has a new rom based chip called plug and go.it is class 2 and requires only an antenna connected to the rf output.it has 8mb internal flash or rom depending on which one you buy.it also includes ain internal voltage reg from ...
RF, Microwave, Antennas and Optics :: 07 Jul 2003 11:24 :: Phil woz ere :: Replies: 0 :: Views: 264
sequential lighting design problem
i am building a prayer candle lamps box for a catholic church. the box has 3 slots to insert coin or paper money. after power up, when some one want to pray he/she insert coin(s) into a slot and the first of 10 of candle lamp lights up for 5 minutes....
Microcontrollers :: 27 Jun 2003 16:22 :: jusman :: Replies: 5 :: Views: 839
i want implantable rf transceiver??
i want implantable rf transceiver. min freq is 400mhz . its should be low power.modulation type for rx-ask and tx-fsk is preferable .....can anyone suggest some vendors? i need it asap.thanks in advance~niks~...
RF, Microwave, Antennas and Optics :: 24 Jun 2003 7:30 :: niks :: Replies: 8 :: Views: 882
new psoc from cypressmicro
the improved psoc architecture will be introduces soon:improvements include:1. new analog and digital blocks2. improved routing scheme3. new user modulesplease visit to http://www.cypressmicro.com soon for following informationand please check applic...
Microcontrollers :: 19 Jun 2003 13:41 :: dacadc :: Replies: 6 :: Views: 974
timming in proteus
how acurate is the timming in proteus???i had some problems to simulate a software serial port in picwhen the simulation works , i had to recalculate the delay for the real pic, the cuestion is who is the problem me or the software???...
PCB Routing & Schematic Layout software & Simulation :: 15 Jun 2003 17:40 :: james :: Replies: 10 :: Views: 1142
req: help to build a simple electronic roulette
hi all,anyone like to help me build a simple electronic roulette with bias capability without having to program a chip for use in a pub. anyone has an easy schematic for this and most importantly the interface schematic or the device to use if i want...
Hobby Circuits and Small Projects Problems :: 15 Jun 2003 16:50 :: Element7k :: Replies: 7 :: Views: 1870
rf oscillator???
i need a rf oscilator of 2 mhz and 5 vpp of output voltage of course i need that want the output be sine of possible, of course i have much problem with oscillator that i have is the sn74ls14n, is anybody have rf oscillator ci or diagram that can sh...
RF, Microwave, Antennas and Optics :: 07 Jun 2003 19:04 :: twinsen :: Replies: 5 :: Views: 1067
how to tune fm receiver
hi,need a procedure for tunning fm receiver with o-scope. :?:...
RF, Microwave, Antennas and Optics :: 06 Jun 2003 13:57 :: artem :: Replies: 6 :: Views: 1148
msp430 clockselction
hi! im using the msp430f449 from ti on the evolution board from www.olimex.com.on this board are two crystal oscillators connected to the uc. one 32.768khz as xtal1 and the other 8mhz on xtal2.in the user guide is discribed how to select xtal2 for ma...
Microcontrollers :: 26 May 2003 10:29 :: reiniheini :: Replies: 0 :: Views: 482
voltage comparator and shmitt trigger
i am now designing a degital frequency measurer,the digital part is completed ,and the analog channel is now under process,and i have some problem ,the input signal is from 1hz-10mhz,and i must make the sine wave to rectangular wave,but the frequency...
Professional Hardware and Electronics Design :: 25 May 2003 12:08 :: wanneng :: Replies: 5 :: Views: 1312
probe 9 - table frequency counter for windows
ant digitsprobe9 is a stable frequency counter accurate to 5 significant digits. range = 0 - 30mhz. input sensitivity >100 mv probe 9 connects to the pc serial port.by using the crystal oscilator already present on your ......
Software Downloads/Uploads :: 24 May 2003 21:14 :: Fairgrounds :: Replies: 0 :: Views: 15
using internal oscilator on an fpga
hi everyone, i did a fpga based design using xil*fouldation and a vhdl program, i was using an oldy xc4032a but was unable to assign the internal oscilator to my clock signal; i had to create a macro of the vhdl and use the schematic editor for it to...
PLD, SPLD, GAL, CPLD, FPGA Design :: 24 May 2003 17:33 :: happytronic :: Replies: 2 :: Views: 875
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