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locked atmega ...
is it possible to reset or do something with locked atmega 8. what i mean by locked is that while programming something happened and chip got locked. now i cant erase it, reprogram it or do anything w...
Microcontrollers :: 07 Nov 2009 18:49 :: thegameabh :: Replies: 84 :: Views: 11098
gsm modem with pic 16f877a
my project is send message from pic to handset through gsm modem..i know we can used hyperterminal and at command..but, how ?what kind of languange can used..c or assembly..what software and compiler ...
Microcontrollers :: 07 Nov 2009 16:05 :: coldy :: Replies: 12 :: Views: 2418
help: midi keyboard controller mkc
i would like to extend the capability of this mkc from the basic 64 key controller (there is also a 128 key available) to a full 8 octave keyboard...i know somhow we have to add more 3x8 decoder (74l...
Hobby Circuits and Small Projects Problems :: 06 Nov 2009 20:51 :: ron roberts :: Replies: 15 :: Views: 972
latest rf tutorial uploaded
hi all,its been a while but ive managed to upload another tutorial to www.rfic.co.ukthis one is satellite communications and is under the systems & devices section...differential lna almost finished -...
RF, Microwave, Antennas and Optics :: 06 Nov 2009 19:09 :: Ranjani1 :: Replies: 78 :: Views: 51442
problem interfaceing pic18f2550 and ks0108 lcd
8 3.34 academiclcd: wg12864b, with ks0108 controller (detailed datasheetpic: pic18f2550, with 20mhz crystal(pagethese are photos of my lcd:front, upglcd.h#include <p18f2550.h>#define glcd_data ...
Microcontrollers :: 06 Nov 2009 17:43 :: hkBattousai :: Replies: 0 :: Views: 81
counting pulses of 500ns by 89c55wd
is it possible to count pulses of 500ns using counter in 89c55wd and crystal of freq 12mhz...??...
Microcontrollers :: 06 Nov 2009 15:09 :: nandhu015 :: Replies: 1 :: Views: 51
made a brenner8p (rev-5) usb pic program
le doesnt contain information about your hardware.4. checked the pic. it was working.5. changed the crystal. no luck.6. already installed the inf files by right clicking them and selecting install but...
Microcontrollers :: 06 Nov 2009 7:26 :: mclarenrulz :: Replies: 2 :: Views: 93
200mhz filter with 200khz bandwidth
meter of coax inside my filter will add quite a lot to the bulk.originally, i had planned to use a crystal or ceramic filter, but i soon discovered that they dont go this high. saw filters, converse...
RF, Microwave, Antennas and Optics :: 05 Nov 2009 21:44 :: Daryl Kemper :: Replies: 4 :: Views: 249
interfacing bluetooth usb dongle with microcontroller
do anyone know how to interface bluetooth usb dongle(which is easily available for pc) with microcontrollers?coz these dongles r easily available n cheaper than bluetooth module so if its possible to ...
Microcontrollers :: 05 Nov 2009 7:25 :: dannym :: Replies: 115 :: Views: 24207
deleted from topic number 369790 mod pranam77
ova -- $190 nokia e71 -- $195 nokia e66 -- $185 nokia n96 16gb -- $185 nokia n78 -- $155 nokia 7900 crystal prism -- $165 nokia n81 8gb -- $175 htc htc hd2@$330,htc pure@$300htc touch2--$260 htc hero-...
Trashcan :: 05 Nov 2009 2:13 :: keane05 :: Replies: 0 :: Views: 15
enc28j60 - very precise value for rbias is needed? - solved
i started building an embedded webserver with enc28j60 and atmega16. the circuit is inspired from http://www.tuxgraphics.org/electronics/200611/embedded-webserver.shtml, adapted for atmega16, and with...
Microcontrollers :: 04 Nov 2009 19:46 :: Devansh :: Replies: 6 :: Views: 2427
i have all the codes:fdtd scattering matrix
,2d,3d),plane wave mothod and scattering atrix(2d,3d) codes. now i mainly deal with the photonic crystals. every one can contacts me.xshsren@126.com...
Electromagnetic Design and Simulation :: 04 Nov 2009 12:29 :: dopin :: Replies: 23 :: Views: 4341
my experiments with pic18f4550 <> usb
com/e_images/pic18f4550_usb_01.jpg1 pc universal board 1 pc. pic18f4550 1 pc. 40pin socet1 pc 20mhz crystal1 pc usb connector1 pc. 470nf capacitor1 pc. 100nf capacitor 2 pc. 22pf capacitors1 pc 4,7k r...
Microcontrollers :: 04 Nov 2009 8:37 :: Jack// ani :: Replies: 50 :: Views: 21021
video pattern generator
video pattern generator with pic16f84 and mc1377...
Hobby Circuits and Small Projects Problems :: 03 Nov 2009 23:57 :: betwixt :: Replies: 23 :: Views: 7385
deleted from topic number 369635 mod pranam77
le doesnt contain information about your hardware.4. checked the pic. it was working.5. changed the crystal. no luck.6. already installed the inf files by right clicking them and selecting install but...
Trashcan :: 03 Nov 2009 18:28 :: mclarenrulz :: Replies: 0 :: Views: 6
deleted from topic number 323439 mod aya2002
le doesnt contain information about your hardware.4. checked the pic. it was working.5. changed the crystal. no luck.6. already installed the inf files by right clicking them and selecting install but...
Trashcan :: 03 Nov 2009 18:24 :: mclarenrulz :: Replies: 0 :: Views: 15
pll spurious ouput?
hello friendsi designed a pll+vco circuit at 160mhz with lmx2316 and minicircuit vcos and 25mhz crystal osc as ref.output is stable (fcom=20khz,loop filter bw = 1khz),but as shown below have spurs at ...
RF, Microwave, Antennas and Optics :: 03 Nov 2009 9:31 :: No one :: Replies: 7 :: Views: 414
at89s52 programmer
hello friends............i am doing my project using at89s52. for this i need to build an isp programmer. i have checked out the one given by asim khan. do u have any other schematics ?please help me ...
Microcontrollers :: 31 Oct 2009 10:59 :: wilson16 :: Replies: 20 :: Views: 3027
crystal vs crystal oscillator differences?
i have not been able to find the stated differences between a crystal and a crystal oscillator.can someone please explain the pros and cons to each of these? what applications would each be better us...
Electronic Elementary Questions :: 31 Oct 2009 6:47 :: Jack// ani :: Replies: 1 :: Views: 96
willman microcontroller programer kit
i need gtp usb and gtp usb-232 schematics, pcb can any one help ? and also want to kno the difference betn these two.thx...
Microcontrollers :: 30 Oct 2009 16:25 :: israel200 :: Replies: 85 :: Views: 42447
plz i need this code urgently
hello every bodymy graduation project is sms remote control,im using t290i ericsson ive tested it with at commands and hyper terminal it works well when i send message to mobile i could read it on hyp...
Microcontrollers :: 30 Oct 2009 10:13 :: ahmadabad :: Replies: 10 :: Views: 777
friends, help to find out the bug of this charger
am a bit confused about the reset pin. also i am not sure about the fuse bits for this uc.external crystal at 10mhz. and the whole thing is a 12v charger that will do 13.8v and 14.6v. the code is sel...
Microcontrollers :: 29 Oct 2009 18:15 :: aq_mishu :: Replies: 82 :: Views: 3102
pic microcontroller does not work
mplab simulator working fine.i guess it is a hardware problem. i do not know how can i check if the crystal oscillator is working fine. i do not have a cro. i am using 4mhz crystal with hs mode. i eve...
Microcontrollers :: 29 Oct 2009 15:55 :: peacezim :: Replies: 15 :: Views: 501
diy moving message display
hi alli want to have moving message display program for atmel at89c251. may some one help me?...
Microcontrollers :: 29 Oct 2009 11:11 :: madicalphy :: Replies: 565 :: Views: 212686
delay before rf amplifier gives stabilized output gain
hi,i am designing power supply sequencing for rf monolithic amplifier. i want to know the delay time of amplifier response. after switch on the power supply, how many ns that amplifier will take to gi...
RF, Microwave, Antennas and Optics :: 28 Oct 2009 16:11 :: vfone :: Replies: 4 :: Views: 123
htc hd2@$330,htc pure@$300,nokia n900@$240
ova -- $190 nokia e71 -- $195 nokia e66 -- $185 nokia n96 16gb -- $185 nokia n78 -- $155 nokia 7900 crystal prism -- $165 nokia n81 8gb -- $175 htc htc hd2@$330,htc pure@$300htc touch2--$260 htc hero-...
Trashcan :: 27 Oct 2009 21:43 :: jude05 :: Replies: 0 :: Views: 105
blackberry bold 9700@$330,blackberry storm2 9520@$320
ova -- $190 nokia e71 -- $195 nokia e66 -- $185 nokia n96 16gb -- $185 nokia n78 -- $155 nokia 7900 crystal prism -- $165 nokia n81 8gb -- $175 htc htc hd2@$330,htc pure@$300htc touch2--$260 htc hero-...
Trashcan :: 27 Oct 2009 21:41 :: jude05 :: Replies: 0 :: Views: 123
coil less fm transmeter
any body can prov. me ;coil less fm transmeter; or ;ic based fm transmeter; max 10 meter rang....
Hobby Circuits and Small Projects Problems :: 27 Oct 2009 17:48 :: sajal1975 :: Replies: 5 :: Views: 336
looking for motherboard repair training ebooks..
looking for motherboard repair training ebooks..thanks for reply.....
Service Manuals, Requests, Repair Tips :: 26 Oct 2009 23:09 :: kahlenberg :: Replies: 10 :: Views: 1994
design a helical cavity filter
im run the helical cavity bandpass filter for very narrow bandwidth filter 0.5mhz, and center frequency is 30 or 90 mhz, i have done lots research on this topic, but few materials can be found, and th...
RF, Microwave, Antennas and Optics :: 26 Oct 2009 17:42 :: freeman T :: Replies: 21 :: Views: 1574
need some opinions on temperature sensor
i am currently working on a project that will give temperature reading.is there any disadvantage of using microcontroller with built in temperature sensor instead of using external temperature sensor?...
Hobby Circuits and Small Projects Problems :: 26 Oct 2009 16:14 :: harrier3 :: Replies: 14 :: Views: 1584
i need 12v dc to 220v ac inverter circuit
hi alli need 12v dc to 220v ac inverter circuits.plz give me with small working circuits which r not difficult to make...
Hobby Circuits and Small Projects Problems :: 26 Oct 2009 10:57 :: sajal1975 :: Replies: 44 :: Views: 29340
change the frequency of the transmiter
how can i change the frequency from the external tuning port on this chip???use pin12??or waht??...
RF, Microwave, Antennas and Optics :: 25 Oct 2009 17:14 :: FANT :: Replies: 3 :: Views: 135
pic18f2550, c18 - what setting to choose for cpudiv?
s // hs oscillator, pll enabled, hs used by usbi have two matters to consider:1) i will use a 20mhz crystal for external oscillator.2) i will use usb feature of the pici read the datasheet of the pic ...
Microcontrollers :: 24 Oct 2009 16:57 :: hkBattousai :: Replies: 13 :: Views: 351
bandsolve for metallic pbg
does any body try to calculate metallic photonic band structures using bandsolve? if so, did you see plasmon bands in h polarization?thank you....
Electromagnetic Design and Simulation :: 23 Oct 2009 22:57 :: zhu_yan :: Replies: 20 :: Views: 1536
microphonic problem in frequency synthesizer unit
hi i bought frequency synthesizer unit and i found if i applied vibration to that unit waveform comming out form synthesizer is not remain good .i can see lots of spur during vibration.can anyone sugg...
RF, Microwave, Antennas and Optics :: 23 Oct 2009 21:40 :: biff44 :: Replies: 1 :: Views: 54
project to replace cy7c64613 in the icd2
i am evaluating the posibitity to replace the cypress usb on the icd2 with a pic18f2550 or similarreasons for this are:-cy7c64613 seems to be dificult to obtain. -lower price ($20 vs $10). -smd packag...
Microcontrollers :: 23 Oct 2009 17:33 :: SG61-addict :: Replies: 1847 :: Views: 371984
low jitter clock generation with a external crystal
hi folks:we are leaning to design a clock generator with a external crystal. whats the term people use for such kind of circuits?just want to better shoot at the searching. regards,neo...
Analog IC Design & Layout :: 21 Oct 2009 21:23 :: JoannesPaulus :: Replies: 14 :: Views: 549
help me in mikroc usart
hii try to use pic18f452 to send data to hyperterminal but i do notget anything . i user hyperterminal in the mikroc compiler and i putit in the hex display but i do not get any thing may be the mist...
Microcontrollers :: 21 Oct 2009 10:29 :: amila133 :: Replies: 11 :: Views: 1152
vhf/uhf transmitter- how to change the frequency?
rfmd,rf2514,i want to know how to change the frequency?the dt said ,it can fine-tuned via internal varactor diodes, but when i change the voltage of pin10, the frequency didnt change,,,,,who can help...
RF, Microwave, Antennas and Optics :: 20 Oct 2009 17:07 :: Mazz :: Replies: 11 :: Views: 615
go to school at uc berkeley for free
i am a student at berkeley and am also half polish, so it is only natural to want to help you guys! berkeley is expensive, but they are very nice about posting all class notes and homeworks in pdf. ...
Electronic Elementary Questions :: 20 Oct 2009 10:31 :: jameswong227 :: Replies: 56 :: Views: 11457
supercell method
ane wave method. i know that it uses supercell method to calculate the bandgap diagram for photonic crystal fiber.could any one expalin to me this method or seggest me a resource for this methid....
Electromagnetic Design and Simulation :: 20 Oct 2009 10:19 :: abdoeng :: Replies: 5 :: Views: 376
regarind sleep instruction in pic18f452
well i am workiong on pic 18f452, using c18 compiler and using mplab 6.62plz have a look at this code : when i run this code in the simulator and watch on the timer 1 contents, the timer 1l dont incre...
Microcontrollers :: 20 Oct 2009 4:34 :: sairasaleem :: Replies: 8 :: Views: 609
a question on the xtal osc deisgn
oscillate.would anyone pls. tell me any wrong with the schematic? is ithis topology suitble for the crystal osc deisgn?thanks in advance...
Analog IC Design & Layout :: 17 Oct 2009 4:05 :: chang830 :: Replies: 13 :: Views: 501
pic volt & amp meterattin6
hello everyone, im looking for any suggestions for a pic controlled dvm to read voltage (0-30vdc) & current (0-10a).... i have on hand some pic16f84s and some tlc0831 adcs i need some help o...
Microcontrollers :: 15 Oct 2009 22:38 :: THANOS10 :: Replies: 53 :: Views: 10891
vhf if filter design
and one down-converter. the second if will be the fm standard 10.7mhz, and uses a standard 10.7mhz crystal filter. the frequency synthesizer ive designed in will generate up to 204.75mhz at my targe...
RF, Microwave, Antennas and Optics :: 14 Oct 2009 1:24 :: Annirak :: Replies: 4 :: Views: 246
gsm sms 8051 controlling relays
dear friends, ok .. thr is a lot of discussions on sending the sms through mobile phonelets now talk abt receiving sms and making a relay on with 8051 controller. if some one has done anything.. about...
Microcontrollers :: 13 Oct 2009 16:33 :: vicky89 :: Replies: 54 :: Views: 6094
photonic crystal
hiiiiiiiiiiiiiiiiiii every on iam ms student iam trying to simulate photonic crystal structure can any one advice me which software is good hfss or translight software i need som examples pleasethanks...
Electromagnetic Design and Simulation :: 13 Oct 2009 11:07 :: Ashubhu :: Replies: 6 :: Views: 471
rsoft bandsolve problem for photonic crystal
hi,i want to calculate the bandgap of a y-splitter photonic crystal with rsoft. the schematic is attached. the structure is airhole triangular photonic crystal in gaas. the refractive index of the y-s...
Electromagnetic Design and Simulation :: 13 Oct 2009 11:00 :: samiye :: Replies: 1 :: Views: 111
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: 1008
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: 114
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 ar...
Microcontrollers :: 13 Oct 2009 0:30 :: samukelo_shezi :: Replies: 12 :: Views: 2376
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 ...
Hobby Circuits and Small Projects Problems :: 12 Oct 2009 16:55 :: pauloynski :: Replies: 23 :: Views: 465
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: 660
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: 210
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 th...
Analog Circuit Design :: 07 Oct 2009 17:12 :: FvM :: Replies: 28 :: Views: 1839
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 = ...
Microcontrollers :: 06 Oct 2009 11:46 :: willi65 :: Replies: 1 :: Views: 285
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: 222
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. ...
Microcontrollers :: 03 Oct 2009 19:34 :: x3.exe :: Replies: 4 :: Views: 216
problem with pic16f876a - led blink
i power up using pic kit 2. but, when i power up using my circuit, it doesnt blink. i am using 8mhz crystal (hs mode). also, i have connected mclr - pin no. 1 to vdd through a voltage divider.is there...
Microcontrollers :: 02 Oct 2009 6:08 :: eanema :: Replies: 18 :: Views: 468
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 ca...
Analog Circuit Design :: 01 Oct 2009 22:48 :: Hanskarl2000 :: Replies: 2 :: Views: 331
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: 59473
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 an...
Microcontrollers :: 30 Sep 2009 12:04 :: kulkarni_sayo :: Replies: 9 :: Views: 1572
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 somethi...
Microcontrollers :: 29 Sep 2009 11:49 :: Shinnster :: Replies: 49 :: Views: 1653
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 ...
Analog IC Design & Layout :: 25 Sep 2009 16:27 :: dick_freebird :: Replies: 7 :: Views: 216
how to interface with kid's wrist watch glass lcd?
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 glass lcd is 14mm wide and 6mm high. it can only sho...
Hobby Circuits and Small Projects Problems :: 25 Sep 2009 8:00 :: nandiram :: Replies: 2 :: Views: 249
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. w...
Professional Hardware and Electronics Design :: 24 Sep 2009 7:42 :: paurelian :: Replies: 19 :: Views: 2693
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: 1317
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: 192
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