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microcontroler circuits and protoboard. is it a bad idea ?
hi everybody,i am making a school project using 8051, adc, lcd and serial com.i am making my prototypes using a protoboard. the problem is that i got random errors happening.i would like to hear from the most experienced ones if these errors can be c...
Electronic Elementary Questions :: 05 Oct 2004 18:04 :: tutx :: Replies: 4 :: Views: 807
in curcuit programming of picīs?
uit programming of picīs. iīm having some problems with the oscillator and with the powersupply when iīm trying to in-curcuit program a pic.by the way: whats the difference between highspeed mode and crystal mode?has anyone ever worked with this prob...
Microcontrollers :: 02 Oct 2004 0:22 :: Brock :: Replies: 4 :: Views: 537
need help with rf transmitters....
maybe some one out there can help me. if this post is not appropriate for this board, please let me know and, if possible, give me another board name. im looking for help with low power radio transmitters/receivers. these transmitters are used ...
RF, Microwave, Antennas and Optics :: 29 Sep 2004 6:24 :: springf2000 :: Replies: 2 :: Views: 273
ADS
:: :: :: Replies: :: Views:
mws energy balance?
may someone please provide some information about the energy balance property of mws. from what i understand this quantity is used to determine wether a two port system has reciprocity. but in the manual it says that energy balance must be equal to 1...
Electromagnetic Design and Simulation :: 28 Sep 2004 14:54 :: Kit-the-great :: Replies: 3 :: Views: 459
programming pic 16f877
i donīt know if itīs necessary to have a clock function in the pic when your programming to be able to read or write a programm....
Microcontrollers :: 28 Sep 2004 1:08 :: Elmer :: Replies: 5 :: Views: 474
frequency counter using at89s51
hi, i need to determined a square digital waveforms frequency. any suggestions on how to do that?? i am thinking of using one of the i/o pins as input from and external source and determining that the frequency of the waveform on that input is 424hz....
Microcontrollers :: 27 Sep 2004 22:21 :: ME :: Replies: 5 :: Views: 549
pic vs 8051
dear friends, can anyone tell me the apreciate applications for each of the microcontroller families pic and 8051, which family is better for different application? :?:...
Microcontrollers :: 25 Sep 2004 7:48 :: C-Man :: Replies: 2 :: Views: 336
how to design a low jitter clock for data converter?
my data converter is ad9863. my adc sample clock is souced from fpga. the sample clock from fpga isnt clean. the adc sample clock frequecy is 15mhz.i find that noises are introduced into my system. i have some problems about clock. the sample clock ...
Analog Circuit Design :: 24 Sep 2004 13:17 :: elcielo :: Replies: 3 :: Views: 552
watch dog timer
hii am using at89s51 can any one tell how to implement watch dog timer with some code example....
Microcontrollers :: 23 Sep 2004 21:09 :: 777 :: Replies: 5 :: Views: 375
a doubt on oscillator...
hi, im a bit confusing with the correct frequency of an oscillator to be used. may i know wat condition determines how fast an oscillator to be used? is it the higher the frequency of an oscillator, the faster the pic operates? besides, how do we ...
Microcontrollers :: 23 Sep 2004 8:21 :: Mr_Programmer :: Replies: 3 :: Views: 405
do we need decoupling capacitors for each ic?
as above.besides, im using a voltage regulator (7805) in my circuit, do i need to put decoupling capacitors too? i found some circuits which always use few capacitors on the output voltage side of the voltage regulator, what are they used for?thanks!...
Electronic Elementary Questions :: 21 Sep 2004 6:21 :: dreamcard :: Replies: 21 :: Views: 2362
accuracy of sa adc
could someone list what non-idealities will affect the sa typeadc accuracy in term of design and layout issues ?thx...
Analog IC Design & Layout :: 20 Sep 2004 2:17 :: CDRCDR :: Replies: 7 :: Views: 687
how to design a 1s period 10% duty cycle square wave osc?
the period is 1 second, duty is 10%(100ms).how to design such square wave osc and integrated on one chip?thank you...
Analog IC Design & Layout :: 18 Sep 2004 16:06 :: papyaki :: Replies: 4 :: Views: 513
how to apply a crystal oscillator to a mixer?
hii want to apply a crystall oscillator to a mixer, and want to filter unwanted harmonics. what is the best solution?regards...
RF, Microwave, Antennas and Optics :: 14 Sep 2004 22:32 :: DJ :: Replies: 9 :: Views: 837
8051 ,pic ,avr ?????
what the differencewhat the best one what are easeist one to learn end programme :?:...
Microcontrollers :: 14 Sep 2004 0:49 :: manitooo :: Replies: 51 :: Views: 5013
i have some confusion on crystal oscillate.
the remark of crystal oscillate circuit as: in the above circuit, resistor r1 is used to bais the invecer and to cause it to operate in its linear region. resistor r2 is used to bias the crystal unit.i cant understand it. who can explain th...
Analog Circuit Design :: 08 Sep 2004 19:42 :: House_Cat :: Replies: 1 :: Views: 222
sic (silicon carbide). is this process technologies future?
from first semester at masters. sic stands to 700-750 celsius whereas si bails at (is unusable) at 150-175, in reality nothing works well about 75-120c and for a long time.anyway it was said that sic crystal growth of usable sizes......
Analog IC Design & Layout :: 08 Sep 2004 11:58 :: rajesh13 :: Replies: 3 :: Views: 307
randall w. rhea - oscillators, microwave - design and ..
hi all, i am looking for this e-book randall w. rhea - oscillators, microwave - design and construction. could you help me ?...
RF, Microwave, Antennas and Optics :: 07 Sep 2004 17:48 :: RFFFer :: Replies: 5 :: Views: 420
usa to europe radio standard modification
the usa radio standard, and only find the impaired termination radio stations (e.g.: 103.1mhz)this must have to change that capble to find the both termination stationsthe pll ic: pm2004b with 7.2mhz crystalthe tuners ic: pa4023a and 4024a with 10.26...
Service Manuals, Requests, Repair Tips :: 26 Aug 2004 19:28 :: feles :: Replies: 0 :: Views: 258
zigbee
next home and industrial automation solution.i think it is best if they provide it with good price on one chip design :d.www.zigbee.org...
PC Programming and Interfacing :: 21 Aug 2004 4:44 :: visualart :: Replies: 7 :: Views: 1297
pal syncro signal generator
hi all,i need to generate horizontal, vertical, odd/even field, signal for a pal system.i used some time ago a znaxxx chip that, with an external crystal, creates hsync, vsync, o/e field, but now this chip is in obsolescence...some suggestions?i re...
Analog Circuit Design :: 19 Aug 2004 10:48 :: cbsirio :: Replies: 0 :: Views: 462
pic16f84a interact with rs-232
rd that the timing for the computer and the pic must be the same, in order to send data to my computer. im using mscomm control to receive data, the baud rate is 9600bps, while my pic is using a 4mhz crystal. so, what delay time i should set for th.....
Hobby Circuits and Small Projects Problems :: 16 Aug 2004 7:45 :: wylee :: Replies: 6 :: Views: 1152
ad9835
does anybody see or can help me with code for ad9835 at hi-tech c, orother c....
Microcontrollers :: 15 Aug 2004 2:26 :: myown :: Replies: 3 :: Views: 687
mips + mhz
whats difference b/w mips and mhz ? and when each of them is used ?tnx ahead...
Electronic Elementary Questions :: 14 Aug 2004 13:54 :: FoxyRick :: Replies: 1 :: Views: 738
fundamental & overtone crystal
i am so confusing of fundamental and overtone crystal.who can tell me the difference between them? thanks!!!...
Analog Circuit Design :: 12 Aug 2004 4:10 :: sadfish :: Replies: 2 :: Views: 273
max.osc.freq. to communicate with pic18 uart at 115200 baud?
hi,im using pic18f452 at 40mhz.its uart doesnt support 115200 baud rate with 40mhz xtal.baudrate = 40mhz / (16*(21+1)) = 113.636,3636error = %1.37 is not acceptable for me.which frequency should i use to make error=0.0 ? it also must be nearest value...
Microcontrollers :: 06 Aug 2004 15:35 :: muko :: Replies: 5 :: Views: 621
anyone know how2write 65x132 ram-map lcd controller/driver?
the lcd that i using is dot-matrix liquid crystal display. so im not sure how2 write a program by using c. is it need2 declare all the characters into lookup table?how?any example?...
Microcontrollers :: 02 Aug 2004 11:33 :: meax98 :: Replies: 3 :: Views: 483
[need help] integrated x-tal osc
who can give me this paper? 8o integrated x-tal oscillators philips research laboratories, centre for technical training....
Analog Circuit Design :: 02 Aug 2004 2:01 :: bear7679 :: Replies: 2 :: Views: 423
hardware design of 3mb/s point-to-point data link..
hi.ive posted many questions in this board, and have received many useful replys. i thank you. heres my next problem.... :? basically ive designed a simple protocol on cplds for a 3mb/s data link using manchester encoding (1byte preamble, 2 bytes...
Professional Hardware and Electronics Design :: 31 Jul 2004 2:26 :: Buriedcode :: Replies: 3 :: Views: 471
generating a 1mhz clock signal from computer?
is it possible to write a program that would generate a clock signal to the serial port so i could use it to run a mcu?...
Microcontrollers :: 29 Jul 2004 3:53 :: checkmate :: Replies: 11 :: Views: 480
pulse counter
i am useing pic16f87a to detect the frequncy change on ra4 by counting the input pulse of tmr0. the frequency is around 80khz depending on the sensor and the osc is 8mhz. in every 160ms, the number of pulses is 0x36b5 or 0x36b6 which means the frequ...
Microcontrollers :: 28 Jul 2004 13:38 :: HeiFelix :: Replies: 4 :: Views: 405
sed1330fba graphic controller
hi,im having problem with graphic controller sed1330fba connected to seiko g2436 graphic lcd. anyone have the sample code to initialize this configuration?any help or pointer will be appreciated.thanks & regards,wh...
Hobby Circuits and Small Projects Problems :: 27 Jul 2004 14:10 :: Henri :: Replies: 8 :: Views: 2847
ive some questions on silicon crystal?
it is regaerding silicon crystal.can u define these terms? 1. float zoning 2. float zoned growth 3. single crystal 4. zone refining 5. zone leveling...
Electronic Elementary Questions :: 26 Jul 2004 14:45 :: leo83 :: Replies: 2 :: Views: 1321
low range wireless dynamic mic tx
need a crystal controlled 6v or 9v powered fm transmitter(no smd). this will be used to transmist a dynamic mic or guitar signal to a power amplifier. range within 100m is ok. preferably frequency within fm commercial band(87,5mhz-108mhz) but can be...
Hobby Circuits and Small Projects Problems :: 24 Jul 2004 19:32 :: fjpompeo :: Replies: 2 :: Views: 828
pic16f84
hi there..currently, i am trying on the pic16f84 to act as a serial to parallel data converter..ill enclose my source code here..there a problem surface when i try my code.the 8leds (represent 8 parallel bits) will not light up accordingly. sometimes...
PC Programming and Interfacing :: 20 Jul 2004 10:04 :: C-Man :: Replies: 7 :: Views: 819
need help oscillator design
design i have to used a oscillator as a part of the design. can any body help me in how to design a rf oscillator. what the formulla and what paremeter need to take in account. i have a schmatic for crystal oscillator but what i need here is how to ...
Analog Circuit Design :: 20 Jul 2004 9:13 :: shahrol_hisham :: Replies: 5 :: Views: 573
10ghz lo
i am looking to build a cheap, stable and good phase noise lo on 10ghz. output level should be at least -10dbm.any idea?regardsvfone...
RF, Microwave, Antennas and Optics :: 19 Jul 2004 20:12 :: hf2050 :: Replies: 13 :: Views: 4778
what do i need to make a 555 to output a 1 sec pulse?
can you please tell me what itmes i would need and how to lay it out so i can make a 555 timer have a 1 sec out pulse?...
Hobby Circuits and Small Projects Problems :: 18 Jul 2004 19:42 :: djalli :: Replies: 15 :: Views: 1107
adpll design help
hi,can anyone help me out :?: i am designing a digital-pll with a center freq. of 2.048mhz with 100 hz spacing. i have a 66mhz crystal and to achieve this step-size, the count value for the fractional-n counter is too high. how do i overcome this di...
Other Design :: 16 Jul 2004 14:09 :: Serg_SV :: Replies: 2 :: Views: 1764
cpld, wireless digital audio...
hi, i posted a similar question in the dsp forum, probably the wrong place to post it, no-one replied :oops: well, i have designed a system to convert an audio signal into digita, send this across some sort of wireless link (radio, ir etc..) and th...
PLD, SPLD, GAL, CPLD, FPGA Design :: 14 Jul 2004 18:31 :: Buriedcode :: Replies: 6 :: Views: 708
help: how to simulate piezoelectric element in hspice
i use the piezoelectric element to sense vibration and then the piezoelectric element generate a ac voltage. i want to use a equivalent electric circuit in hspice to simulate this process.how to get the equivalent electric circuit components? what ar...
Analog Circuit Design :: 14 Jul 2004 13:56 :: leonken :: Replies: 2 :: Views: 265
rs232 to usb converter
hello i doing a project using at89s52 now i am serial commutation to commutate to the pc(rs232).i want to convert this rs232 output into usb.can any one tell me how to implement with some code(asm) example or any link...
Microcontrollers :: 12 Jul 2004 12:25 :: ME :: Replies: 2 :: Views: 864
what is xtal?
clock?...
Hobby Circuits and Small Projects Problems :: 08 Jul 2004 18:26 :: hill :: Replies: 10 :: Views: 702
"frequency offset" of "reference clock"
could anyone tell me:if use external crystal as a reference clock, the frequency offset of this crystal is important in a wireless transmitter. whats the special concern on frequency offset? it impact which performance of a wireless transmitter?if wh...
Analog Circuit Design :: 08 Jul 2004 6:23 :: cqmyg5 :: Replies: 0 :: Views: 342
power measurement
the idea is to measure the power my home uses, store and analyze later with a pc.a digital power meter with pulses per watt should be handy for this but i have a analog one with rotating disk.what i want: the incoming phase of my home into a lem curr...
PC Programming and Interfacing :: 30 Jun 2004 9:16 :: mario1980 :: Replies: 16 :: Views: 2470
quetion in serial communication with at89c52
im using microcontroller atmel at89c52 i need to make an interface with pc via serial port and im using max232 the question is what kind of crystal needed to do that i mean the frequency of the crystal.thanks,...
Microcontrollers :: 26 Jun 2004 21:19 :: mahran :: Replies: 9 :: Views: 1122
floorplan compiler
hi gang,if someone has a floorplan compiler users guide in pdf you could you either post it or email it to me??? thanks a bunch!!mike...
ASIC Design Methodologies & Tools (Digital) :: 26 Jun 2004 4:59 :: wadaye :: Replies: 7 :: Views: 1104
32k quartz spice model
hi,were can i find a spice model for a 32khz crystal quatrz.maybe you know a link or a paper for this quartz.thanks....
Analog IC Design & Layout :: 24 Jun 2004 11:15 :: ynhe :: Replies: 3 :: Views: 2390
i need a simple bootloader for 16f877
i need a simple one.anyone got it?...
Microcontrollers :: 20 Jun 2004 22:25 :: sinkplaat :: Replies: 6 :: Views: 969
which type of filters?
i have known three type of filters. there are :1) digital filters -a digital filter is a calculating process which is performed by digital components like dsps or fpgas. 2)rc-filter- they consist of rc-networks and amplifiers. the rc-filter is the cl...
Analog Circuit Design :: 20 Jun 2004 9:40 :: jetset :: Replies: 10 :: Views: 710
what about the phase noise of my phase locked source ?
the crystal oscillator (-100dbc/hz.100khz) and microstrip vco (2ghz) are employed. the phase locked source uses the means of sampling lock.i got the phase noise -82dbc/hz.100khz. it is bad or good? :?: :?: :(...
RF, Microwave, Antennas and Optics :: 19 Jun 2004 16:47 :: E-design :: Replies: 15 :: Views: 1458
can anybody explain me what crc is ?
crc = clock recovery circuiti dont how to make it realized....
Analog Circuit Design :: 17 Jun 2004 10:03 :: mukeshk :: Replies: 11 :: Views: 1709
low power cmos crystal oscillator
hi, all,does anyone have any idea to design a low power cmoscrystal oscillator. it is supposed to be low voltage ~1.5vand consume only < 1ua current.any comments or suggestion is welcome.thanks in advacne.vita...
Analog Circuit Design :: 17 Jun 2004 6:46 :: iamlog :: Replies: 4 :: Views: 792
xc9572 demo board
rd. my requirements are as follows :- it should contain 2 seven segment displays, 2 reset switches( +ve and -ve), 8 leds, and all remaining ios available to be probed. and also a clock circuit (using crystal/oscillator)can anyone help me with this,th...
PLD, SPLD, GAL, CPLD, FPGA Design :: 17 Jun 2004 5:14 :: hoangthanhtung :: Replies: 6 :: Views: 1492
frequency synthesis
frequencys synthesis...
RF, Microwave, Antennas and Optics :: 16 Jun 2004 22:02 :: papyaki :: Replies: 1 :: Views: 1065
how to use graphic lcd mobile phone by use pic 16f877
i want to know how to use graphic lcd mobile phone by use pic 16f877.please help me..... does it have colour graphic lcd? thank...
Professional Hardware and Electronics Design :: 13 Jun 2004 20:35 :: pomidor :: Replies: 6 :: Views: 4014
capacitors at voltage regulator and crystal
i dont know actually the function of these capacitor in practically and theorytically.i wanna know how the value of the capacitor is calculated?and, type of capacitor and their usage?sorry, maybe these is a stupid question....
Microcontrollers :: 12 Jun 2004 11:43 :: Mr_Programmer :: Replies: 1 :: Views: 282
msp430 question
ere is no combination of low power mode such as :oscoff and cpuoff are set and scg0 and scg1 are not .means aclk and cpu off , dco and smclk are running . that is needed to run mcu without external crystal components and supply timer through smclk ...
Microcontrollers :: 11 Jun 2004 13:10 :: artem :: Replies: 0 :: Views: 198
pic16f877
:cry: i have little knowledge on microcomtrollers... kindly tell me the basics that i should know regarding my pic16f877... also, plese send me sample programs that would be of great help to me... i really have to know how this works... every single...
Embedded Systems and Real-Time OS :: 11 Jun 2004 4:54 :: samcheetah :: Replies: 11 :: Views: 7920
diana needs help about ncs2001 amp
hello,can anyone help me on my little project herein. im using an rail-to-rail operational sub-1v amplifier ncs2001sq2t1 (on semiconductors), for ampifying very low (mono) audio signal from an old reciever. ampifyer is powered by single 1,4 button ...
Analog Circuit Design :: 11 Jun 2004 3:28 :: Borber :: Replies: 8 :: Views: 719
does there exist one usb to multi-rs232 converter?
hello experts,here i have several rs232 legacy peripherals, but my computer only provides one usb port, one serial port. so i intend to seek a converter that can hub multi-rs232 port into single usb interface.i want to know if there exsit ready-made ...
Electronic Elementary Questions :: 10 Jun 2004 22:39 :: dainis :: Replies: 4 :: Views: 1751
10.7mhz ceramic discriminator
0a.pdf) shows a 10.7mhz ceramic discriminator needed for fsk demodulation of signal. as i read, a discriminator is essentially a resonator.http://download.jap.hu/discriminator.pngcan i use a standard crystal in parallel with a resistor in place ......
RF, Microwave, Antennas and Optics :: 10 Jun 2004 9:41 :: jap :: Replies: 5 :: Views: 876
how to generate 10m input to the clkin pin?
is there a simple way to get a 10m clk signal, i need that to connect to the clkin pin of the chip. what is the circuit design like?can anyone help?...
Electronic Elementary Questions :: 04 Jun 2004 16:15 :: Noman Yousaf :: Replies: 12 :: Views: 1779
help building a 915 mhz oscillator and amplifier
hi all, thanks for looking. heres a newbie question. i need to build an oscillator and have no idea on whats the best way to do it. it is the first part of a project that i am doing and i am hoping to get good signal. i know i will probably need a...
RF, Microwave, Antennas and Optics :: 02 Jun 2004 6:32 :: bry :: Replies: 6 :: Views: 324
very strange problem
if there is a track in a pcb and the board is not working unless you connect a wire between the 2 ends of this track ??although the track does not have any conductivity problem ???i have designed a 80186-based boeard .. after assembling , the board d...
PCB Routing & Schematic Layout software & Simulation :: 27 May 2004 9:21 :: pico :: Replies: 5 :: Views: 405
high speed processor clock oscillators
does anyone know how the fast oscillators for pc processors work? they tend to use crystals, but thats all i know about them. does anyone have any documents regarding crystal oscillators?...
Analog Circuit Design :: 26 May 2004 7:20 :: pisoiu :: Replies: 3 :: Views: 609
how to measure crystal oscillator
dear all : i have design crystal oscillator , but i need to measure the logn time for glitch , maybe some power noise , or other noise , myabe the crystal oscillator have glitch , how do i measure it using scope , thanks...
Analog Circuit Design :: 24 May 2004 13:15 :: radiohead :: Replies: 1 :: Views: 348
help
ddd...
Electromagnetic Design and Simulation :: 18 May 2004 4:15 :: jackle :: Replies: 11 :: Views: 1646
aes - ebu to l and r
hi alli want to convert the aeb-ebu stream to l and r.pl help me...
Hobby Circuits and Small Projects Problems :: 15 May 2004 8:11 :: AndaMan :: Replies: 1 :: Views: 339
weird problem
i am having this very annoying problem.i have a board with a pic16f876a and everything works fine. well, yesterday i mounted a lcd on it (manufacturer jean, part id 16201s). it is connected to portb and porta (it has 11 inputs). when i configure the ...
Microcontrollers :: 12 May 2004 8:45 :: Z80 :: Replies: 11 :: Views: 480
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