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how msp430f149 dco freqn bring down to 32khz???
hi how msp430f149 dco freqn can be brought down to 32khz??? ..... we need to place external resistor ?what should be resistor setting needs to b done?? ............ im operating msp430f149 at 1.8 vniks...
PC Programming and Interfacing :: 21 May 2003 17:12 :: Smokey :: Replies: 1 :: Views: 657
need help in designing high stability overtone crystal osil
i use a 3 overtone crystal(fo=40.175mhz,cl=18pf,req<35) to design an 160.7000mhz local osillator(4x40.175mhz) in an vhf reciever worked in 150mhz.i found it is very difficult to align the lo to 160.7000mhz.when i try to change l16,l13 or c7,c74 ...
RF, Microwave, Antennas and Optics :: 21 May 2003 12:42 :: Encrypted :: Replies: 2 :: Views: 497
effect of plating to microstrip
how can i take into consideration the effect of the plating to microstrip circuits? :?: is soldermask advisable?thanks...
RF, Microwave, Antennas and Optics :: 19 May 2003 14:11 :: jupitorcuu :: Replies: 9 :: Views: 1190
how i control 89c51 with external modem
how i control external modem with 89c51 use rs232 :roll:...
Microcontrollers :: 08 May 2003 8:51 :: J_expoler1 :: Replies: 3 :: Views: 641
fast 8051 microcontroller
im searching for a fast microcontroller, i need for about 100ns or less cycle instruccion time, i know 8051 family microcontrolles very well, so i need such a fast uc or uc with dma capacity, i have been wondering if an arm based uc its good for my p...
Microcontrollers :: 28 Apr 2003 20:13 :: algilsan :: Replies: 15 :: Views: 1341
lowest cost rtc ic
our,day of the week (i have accuracy problems with pic interrupts), but it should be really low cost. any ideias for low cost rtc ics?(i have seen st m41t00/80 that can be a choice, but need external crystal)thxneuralc...
Professional Hardware and Electronics Design :: 31 Mar 2003 19:34 :: se7en :: Replies: 19 :: Views: 1190
2 big problems concerning avr
i have two major problems and i really need anyones help1) i cant make adc of 8535 to convert right. i have tried the sample program of bascom avr and i have tried some of my routines but with no result. i connected aref to avcc and both with one res...
Microcontrollers :: 20 Mar 2003 21:51 :: revolt :: Replies: 5 :: Views: 822
clock generator 32khz
hello,i need clock generator 32khz (square 3,3v) for cpld. does anyboby know a suitable chip (as small as possible). thanks.frantak...
Professional Hardware and Electronics Design :: 18 Mar 2003 12:42 :: crazyduck :: Replies: 3 :: Views: 267
asking for technical help
dear friends,i have used at73c501(atmel chipset solution for metering) for a power metering system.unfortunately i have faced a problem in mass production that i hope somebody here can help me to solve it.as a matter of fact,everything was ok with th...
Professional Hardware and Electronics Design :: 15 Mar 2003 14:08 :: ted :: Replies: 1 :: Views: 176
help: automotive detonation sensor amplification..
need help designing a board to take one input and give 3 simple outputs.the input is a piezoelectric crystal detonation sensor (bosch type), i believe these are fairly generic in nature?outputs are simple also*8 bar led display*0-5v signal level outp...
Hobby Circuits and Small Projects Problems :: 28 Feb 2003 20:52 :: flatulent :: Replies: 1 :: Views: 807
crystal tester
does anyone know crystal tester that can be used to determine the frequency of a crystal, with a lcd display, and check if a crystal is defect....
Professional Hardware and Electronics Design :: 27 Feb 2003 21:47 :: FANT :: Replies: 2 :: Views: 531
need help on sigma delta adc?
helloi have worked with analog device ad77 series(like as ad7714,15,19,30)but i have problem with them in noisy environment and in sensors that connected to it with long cables ,sometimes they hang or lock, if i power off the card then power on it ,i...
Professional Hardware and Electronics Design :: 26 Feb 2003 22:55 :: 7rots51 :: Replies: 15 :: Views: 1427
lna's problem!
i try to put it in the liquid nitrogen and it fail. can you tell why?...
RF, Microwave, Antennas and Optics :: 20 Feb 2003 20:56 :: Mazi3 :: Replies: 3 :: Views: 643
low phase noise oscillator & narrow band passive bpf
in my new project i may need a low phase noise 160 or 180mhz oscillator for ad9856 ( dds chip). someone suggest me to use a 10mhz ocxo to catch lower phase in near-band, in this project the phase noise of dds output must below -70dbc @10hz. if i u...
Professional Hardware and Electronics Design :: 20 Feb 2003 4:50 :: Jensen :: Replies: 7 :: Views: 1718
my ics got a bad cold? what happens?
i have a design with regular ics and fpgas. they are all rated from 0 to 70 degree celsius. although i know what will happen if the temperature is too high, i wonder what is the effect of the cold on them.what happens if i powerup the board and the t...
Hobby Circuits and Small Projects Problems :: 16 Feb 2003 14:54 :: TurboPC :: Replies: 8 :: Views: 1262
question about 2.2 ghz low noise vco...????
i guys,i need to develop a 2.2 - 2.4 ghz vco with very low noise caracteristics,about -110 dbc at 10khz and -130 dbc at 100 khz...it is very difficult to find a right schematics for the large tuning range !!!have you any good idea ?????? thank yo...
RF, Microwave, Antennas and Optics :: 10 Feb 2003 0:44 :: webdog :: Replies: 8 :: Views: 735
requesting avrlib.zip
does anyone have te avrlib.zip file from http://hubbard.engr.scu.edu/avr/avrlibthe link didnt work.visioneer...
Microcontrollers :: 08 Feb 2003 16:05 :: visioneer :: Replies: 2 :: Views: 4950
how to overcome microphonic disturbances in electronics..?
does someone know,how to overcome microphonic disturbances in electronics..?for example:an elektronic unit mounted in a closed metal box.when knoking on the box,it causes ber...,what electronic component can be sensitive to this phenomenon..?how one ...
Professional Hardware and Electronics Design :: 05 Feb 2003 8:58 :: bulerias :: Replies: 9 :: Views: 683
fast ethernet with 8051
hello everybody....im searching info to build a 8051 system with fast ethernet comunication. ill need information about specifications, software and schematics...any chip implements the osi levels?thanks for all....... :lol:...
PC Programming and Interfacing :: 04 Feb 2003 15:56 :: user1998 :: Replies: 8 :: Views: 1762
how to build a r/c receiver???
hi!how do i build a r/c receiver for 40mhz?any good links or other information?i had a hitec 5-channel receiver that gave up...does anyone perhaps have the schematic for it? (hy-5rn)thanks!/janne...
Professional Hardware and Electronics Design :: 03 Feb 2003 19:48 :: cipo :: Replies: 3 :: Views: 753
low voltage and low frequency oscillator ????
hi guys,i nedd to develop an sqare wave oscillator in the frequency range of about 400 khz up to 1.5 mhz with only 2 v of power supply.!!!!i have tested the standard 74hc4046 but the minimum power supply for the oscillator stage is 3 v.....please giv...
Professional Hardware and Electronics Design :: 27 Jan 2003 13:45 :: bunalmis :: Replies: 4 :: Views: 611
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homemade stuff
h**p://www.webx.dk/oz2cpu/radios.htmir controll sampler using 6116 ram no cpuir controll sampler using zilog z8 microcontroller and 6116 ramserial sender using 6 pcs. 4021 and crystal osceprom programmer copier manual bit edit 2704 to 27512eprom soun...
Software Links :: 25 Jan 2003 14:20 :: thisthat :: Replies: 0 :: Views: 1445
pbg filter
i want to design a pbg microstrip filter passband is 820mhz-960mhz and the stopband is 1.71ghz-2.17ghz. anyone can share the design experience with me.thanks!...
RF, Microwave, Antennas and Optics :: 22 Jan 2003 19:20 :: Lupin :: Replies: 2 :: Views: 450
n*o*r*d*ic rf modules have a 4mhz strange..
hisome n*o*r*d*ic rf modules have a 4mhz crystal but they send and receive information with a 433mhz frequency.how is this possible? how can i get a 433mhz signal with a 4mhz crystal oscillator as reference??thank you in advance...
RF, Microwave, Antennas and Optics :: 21 Jan 2003 3:48 :: flatulent :: Replies: 6 :: Views: 969
pic18fxx2 overclock!
i tried to run some of them with 12mhz and 13 mhz crystal with x4pll. it worked at 12x4:48mhz fine but at 13x4:52mhz didnt workedfor all of chips.i got better results with oscillators (50mhz) instead of crystals.i heard sxs can be overclocked much mo...
PC Programming and Interfacing :: 19 Jan 2003 5:14 :: Nick C. :: Replies: 8 :: Views: 1466
15625hz oscilator
hi!how can i make a 15625hz oscilator?i want to put a ne565 or a 4046 oscilating at that precise frequency, with very small deviation +-10hzthanks!...
Professional Hardware and Electronics Design :: 14 Jan 2003 23:19 :: alterego :: Replies: 14 :: Views: 1854
avr at90s1200 speed ? need help
hi,i am going to build a project need a fast uc. { canal+ paytv decoding }i fimiralr with at89c2051 but with each machine cycle, it takes 12 oscillator or clock cycles.so if the crystal is 24mhz {max} the time per instruction is 0.5 us {too large}an...
Professional Hardware and Electronics Design :: 31 Dec 2002 9:09 :: abouras :: Replies: 5 :: Views: 654
pic mcu timer1\timer0 maximum external clocking frequency
hello all please i have the following questions about clocking timer0 or timer1 using an external clocking signal (i.e on pin t0ki or t1ki):1. what is the maximum frequency supported, 2. can i supply it with 5mhz or 9mhz xtal and it will work2. the b...
Professional Hardware and Electronics Design :: 30 Dec 2002 0:08 :: flatulent :: Replies: 1 :: Views: 331
increase pwm frequency with 68hc11 ??
to control the switching element in a boost converter application. however, the maximum frequency capable of the 68hc11 is not even close to being what i desire.68hc11 max frequency is based on the crystal frequency, mine is 4mhz. so using 8 bit p...
PC Programming and Interfacing :: 24 Dec 2002 23:23 :: Mr.Cool :: Replies: 8 :: Views: 2344
quartz question
in the pic 16 datasheet is mentioned that it must be used with quartz with parallel resonanse. how can i distinguish serial or parallel is crystal ? is there general marking for parallel and serial resonance crystals ( for example all parallel mark...
Professional Hardware and Electronics Design :: 15 Dec 2002 6:37 :: flatulent :: Replies: 1 :: Views: 295
mplab 6.xx and icd
mplab 6.xx wont suport standat icd !bad news, does anyone know if icd2 is like icd, schematic and program are given by microchip.by the way stay to the mplab5.7.ouille...
PC Programming and Interfacing :: 14 Dec 2002 23:30 :: jss :: Replies: 5 :: Views: 1935
8051 microcontroller problem
hallosometime ago i started a new microcontroller project an so i started to develop an board based on the famouse dallas 80c320 microcontroller: schematics...but the problem is, it does not run:cry: i have allready inserted the third eprom with the ...
Professional Hardware and Electronics Design :: 28 Nov 2002 14:31 :: salamander :: Replies: 15 :: Views: 1007
guitar circuit needed
ive got an old acoustic guitar that i would like to add a pick-up to. i remember seeing a circuit in a magazine that used a piezo element and an op-amp. i dont remember which magazine though.does anyone have a circuit or a link for a project like thi...
Professional Hardware and Electronics Design :: 06 Oct 2002 18:11 :: MP3Hombre :: Replies: 5 :: Views: 397
probably dumb but....
ok, im working (also) on building a spectrum analyzer. i have an electronics instructor that once told me that an lo signal doesnt necessarily have to be a sine wave at all. last i checked, a spectral analysis of a square wave is pretty nasty....ha...
Other Design :: 04 Oct 2002 23:31 :: FANT :: Replies: 2 :: Views: 1118
twist nematic liquid crystal display help plzzzzzzzzzzz
plzzzzzz help meeeee :cry: if any one know something about the director distribution , when the electric field is applied on lc material.or links, pm me plz or manowar@gawab.comthx...
PC Programming and Interfacing :: 02 Oct 2002 23:38 :: aymanshaafi :: Replies: 0 :: Views: 744
49 mhz xtal tx and rx
im looking a very simple schematics about tx and rx circuits for 49 mhz.this circuits must have a crystal to lock the transmission frequency and lock the reciever.thanks a lot! :d...
RF, Microwave, Antennas and Optics :: 27 Sep 2002 0:04 :: rampo :: Replies: 0 :: Views: 850
-need cristal emulator or generator via software or hardware
:oops: hi ppl. i need for a projeckt adjustable crystal (osc) for microcontroller or another one. like 4mhz to 20 mhz (3.5,7.0,or 14 etc)how i do its ? can microcontroller its ?best regardshasan zara basan...
PC Programming and Interfacing :: 23 Sep 2002 5:00 :: HasanZara :: Replies: 5 :: Views: 1402
i need help with ultrasound receiver circuit???
hello well im trying to build a receiver circuit for one frequency 2 mhz (echo) but i need two circuits a rf tuning amplifier and one demodulator my question is if i can build this with opams or i need circuit tank with transistors or if somebody hav...
Other Design :: 30 Jul 2002 14:53 :: ironjaycuttler :: Replies: 5 :: Views: 2401
delay and timer help!!
hi,i want to build a circuit that when i start it the led will stay off about 30 sec. then it wil illuminate 1 min. and then it will go off.it will lock the start button i mean when i give another pulse it will not accept the second one.i tried to bu...
Professional Hardware and Electronics Design :: 08 Jul 2002 20:35 :: btbass :: Replies: 10 :: Views: 914
help:design clock 4mhz
hi, i hope that somebody can help me/ give suggestion how can i achieve a 4mhz square wave from a 20mhz crystal and cmos inverters.. or if you have a better way to do it, that is most welcome :d ive tried to use 4mhz crystal but the produced wavef...
Professional Hardware and Electronics Design :: 18 Jun 2002 4:51 :: kibrun :: Replies: 11 :: Views: 707
how to program lcd-display
i have an lcd-display 4*20.with one hd44105 and two hd44102 controllers.i cant find a datasheet for these controllers. does anybody now how to programm them, i dont understand the function of the two cs pins.so fardominik...
Professional Hardware and Electronics Design :: 31 May 2002 19:14 :: 7rots51 :: Replies: 7 :: Views: 4461
tv notch filter
hello :lol: i want to build tv notch filter for descramling (filtering out) unwanted carrier in tv signal for particular channel of my cable provider. i like the folowing design:h**p://free.prohosting.com/~elin/cable8.htmlbut the problem i encounter...
Professional Hardware and Electronics Design :: 20 May 2002 9:44 :: Rostfrei :: Replies: 18 :: Views: 7176
microcontroller & overclock
hi, im kinda new on all this stuff, i was wondering, speaking of microcontrollers is there anything like overclocking, lets say i have this atmega103 that runs at 6mhz but i put a 10mhz crystal on it, would it work at 10mhz or just blow up?thanks in...
Professional Hardware and Electronics Design :: 24 Apr 2002 4:56 :: brankob :: Replies: 11 :: Views: 883
how to detune a crystal oscillator ?
hi everybody !i need an oscillator which runs at 32,83 mhz with +7dbm output power.i want to keep it as simple as possible, so i want to use a crystaloscillator and an op-amp.as this design will be unique (no series production), i searchedsome catalo...
RF, Microwave, Antennas and Optics :: 20 Mar 2002 9:58 :: Bagster :: Replies: 6 :: Views: 1857
question about rtc and crystal
hello everyone,recently ive a real time clock project, the objective is to generate an accurate 1hz output using 32768hz crystal.at first i think its a simple project, all ive to do is to create a 15-bit prescaler circuit ( 32768/(2^15)=1hz ).the pro...
Professional Hardware and Electronics Design :: 19 Feb 2002 18:00 :: unkarc :: Replies: 13 :: Views: 1441
ic for wide range vco
i very need wide range vco 1mhz to 50mhz sine wave vco if av. chip to do it ?...
Professional Hardware and Electronics Design :: 17 Feb 2002 22:59 :: syzzler :: Replies: 7 :: Views: 1077
questions about oscillator
dear all, i would like to ask what is the difference between crystall and crystall oscillator. and also what is the difference between 2 pins crsytal oscillator and 4 pins crystal oscillator?thnx very muchsunny chu...
Professional Hardware and Electronics Design :: 07 Feb 2002 16:26 :: Pim :: Replies: 4 :: Views: 796
circuit for detect if the video signal is inverted ? help me
hi, i have a cable analog decoder called cablecrypt , the encryption scheme is encrypt the video (by removing hv syncs and randomly invert the video signal) and encrypt the audio signal digitally. i cracked the video signal but there is the problem o...
Professional Hardware and Electronics Design :: 03 Feb 2002 21:54 :: SphinX :: Replies: 16 :: Views: 1378
any good oscillator info?
anyone got any stuff on oscillator theory/design, in particular lc/crystal oscillators?...
Professional Hardware and Electronics Design :: 04 Jan 2002 9:49 :: piles :: Replies: 5 :: Views: 1095
programming oscillators
does anybody know how programmable oscillators (e.g. epson) can be programmed for a specific frquency and what hardware is involved?has anybody a schematic and/or the needed software?...
Professional Hardware and Electronics Design :: 14 Jun 2001 20:40 :: ultravox :: Replies: 4 :: Views: 2243
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