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i got big difference in simulation using q3d and hfss?
while i try to make simulation to a via structure ussing both quasi static(3d) and full wave(hfss) and try to get the rac,lac.. for bothi get the same cirves shapes but big different in valuesfor example at certain fr_q3d=40 mohm rdc_hfss=70 moh...
Electromagnetic Design and Simulation :: 19 Nov 2009 12:10 :: THUNDERRr :: Replies: 0 :: Views: 33
problem with moc3011 & bt136
se, zcd and 89s51 are working properly.i require 0 to 10 steps for speed of fan.when i set fan to zero speed, the fan is turned off, this is fine.but when i set fan to speed = 1, fan is rotating with full speed (......
Hobby Circuits and Small Projects Problems :: 18 Nov 2009 8:36 :: pranam77 :: Replies: 19 :: Views: 381
very good collection of hfss 10 projects
this file contains a collection of hfss projects.they may help you.be successful...
RF, Microwave, Antennas and Optics :: 18 Nov 2009 0:36 :: thanhduc1910 :: Replies: 63 :: Views: 15345
ac current sensor -help with choice ofdevice
hi.. i want to design the ac/dc current sensor for my small wind turbine. i already searched in the website.. they are ic sensor from linear technology, allegro, and maxim-ic.. unfortunately, it is difficult to get that component in my area..anyone k...
Analog Circuit Design :: 16 Nov 2009 12:41 :: FvM :: Replies: 2 :: Views: 111
pic 16f876a pure sinewave inverter
dose any one help me to find a project diy about 12vdc/220vac pwm inverter based on pic...
Other Design :: 15 Nov 2009 19:05 :: doc007 :: Replies: 151 :: Views: 36140
pic16f72 sinewave inverter with asm codes. not working.
hi everypost, please post your sinewave ups related doupts!!...
Power Electronics :: 13 Nov 2009 8:29 :: jayananda :: Replies: 38 :: Views: 6331
ADS
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scr based dc motor speed controller
hi,im developing motor speed controller for permanent magnet synchronous motor(pmsm).i dont know why people love pwm so much for controlling the speed of the dc/ac motor.every where i see is the pwm method for speed control, mostly in h-bridge manner...
Microcontrollers :: 12 Nov 2009 14:37 :: umery2k75 :: Replies: 10 :: Views: 9378
what is the error percentage between quasi static and full ?
what is the error percentage between quasi static and full wave simulator...
Electromagnetic Design and Simulation :: 12 Nov 2009 1:36 :: katko :: Replies: 3 :: Views: 66
microstrip bandpass filter design
hello everybody,fist off, id like to thank this community for all the valuable information and the answers to many of my questions ive found here so far. this is my first post.although microstrip filters are not the main part of my job, i need to des...
RF, Microwave, Antennas and Optics :: 11 Nov 2009 3:49 :: mnigj :: Replies: 8 :: Views: 423
design transformerless power supply
i need help to calculate the current in each branch of the attached circuit and i need some answer for :1:how can i know the max. output ampere from this circuit?2:if i need more than the expected output current what i should doing in this circuit?3:...
Analog Circuit Design :: 10 Nov 2009 3:21 :: mighty12 :: Replies: 6 :: Views: 975
confusion on rectifier
it is said that a rectifier converts pulsating ac into dc.................how is this actually done???...
Electronic Elementary Questions :: 08 Nov 2009 18:51 :: ark5230 :: Replies: 5 :: Views: 246
deleted from topic number 362514 mod pranam77
great! 3x a lot....
Trashcan :: 07 Nov 2009 6:10 :: yueywcy :: Replies: 0 :: Views: 24
can we get -5 v , +5 v using full wave rectifier?
hi allmay any one know if we can get -5 v , +5 v using full wave rectifier?subject editedavoid posting with hello everonepost with proper subject...
Electronic Elementary Questions :: 07 Nov 2009 4:46 :: hameeds01 :: Replies: 7 :: Views: 318
idea about double buffering
hi,i am trying to implement double buffer in vhdl ...i.e., i would like to declare two arrays such that as soon as first one is filled the index should point to second arrays first element. while the second array is filling the read pointer should r...
PLD, SPLD, GAL, CPLD, FPGA Design :: 05 Nov 2009 19:27 :: KSR24 :: Replies: 2 :: Views: 99
ebg structure modeling in cst
i am interested in finding the bandgap of ebg surface using cst.i am confused how to find the reflection phase diagram or dispersion diagram for the ebg surface.which solver should i use frequency domain . time domain or eigen mode solver?also whethe...
Electromagnetic Design and Simulation :: 05 Nov 2009 7:42 :: hntko :: Replies: 39 :: Views: 3093
microstrip gapped square resonator
hello,do you know a refference book or tutorial for designing microstrip square resonators (part of a bpf, with central frequency somewhere in the range 3...6 ghz) and evaluate coupling between them?i will simulate the structure and tune it, but i n...
RF, Microwave, Antennas and Optics :: 01 Nov 2009 17:07 :: vfone :: Replies: 1 :: Views: 36
thyristers fordriving a heating coil
hi friends im doing a project that controls temperature of a heating coil.the heating coil power supply is connected through thyrister and a pwm out put is controlling this thyrister. this is my application. the heating coil is operated in ac. so wha...
Microcontrollers :: 01 Nov 2009 13:45 :: FvM :: Replies: 8 :: Views: 234
pic microcontroller does not work
dear all,i am facing a problem in testing a very simple code with pic16f73.i just want to set the pa0 pin high, so that i can see the led switched on.but unfortunately i cannt see this happening in the hardware.but at the same time i can see the same...
Microcontrollers :: 29 Oct 2009 15:55 :: peacezim :: Replies: 15 :: Views: 612
selenium rectifier module
hii have a selenium rectifier with me and i need to know how to test it with dmm to confirm it is working or not. do you know anything about it?regardsmm...
Electronic Elementary Questions :: 28 Oct 2009 19:56 :: ark5230 :: Replies: 2 :: Views: 135
vrms = vdc ? ?
can someone give me a link on where i can get the relationship between vrms and vdc( given rectified signal below) or are the the same ?hxxp://www.kpsec.freeuk.com/images/dcvary.gifthank you...
Electronic Elementary Questions :: 24 Oct 2009 0:24 :: Johnnyontherocks :: Replies: 15 :: Views: 2041
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: 1587
how can i design passive filter for unipolar pwm inverter
i am designing 24- 400v dc-dc stage after that i am inverting to 230v ac, 50hz,the switching frequency of full bridge inverter section is 50khz. how can i design lc filter for removing switching haronics to get pure sine wave. can u plase help how to...
Power Electronics :: 20 Oct 2009 5:38 :: ankireddy03 :: Replies: 5 :: Views: 399
noise & electronic ballast - 100hz vs 400hz
recently i found out some noise, at about 100hz, on the scope when i placed the probe of channel-1 to one end of a coil and the gnd-probe to another end of the coil. before that i did not have such noise problem, which has been haunting me since few ...
Electronic Elementary Questions :: 16 Oct 2009 13:04 :: FvM :: Replies: 5 :: Views: 264
cpw simulation in ads
hi everybody!i need to simulate some microwave circuits in coplanar waveguides by using ads momentum 2006. i prefer to use strips instead of slots even thought simulation is demonstrated to be more efficient with slots, since i generally start from m...
Electromagnetic Design and Simulation :: 16 Oct 2009 7:34 :: besttor :: Replies: 7 :: Views: 1320
cpw
anyone have any example projects/setups for doing cpw in hfss or momentum ?thanks...
Electromagnetic Design and Simulation :: 11 Oct 2009 23:12 :: h_bs_on_wafer :: Replies: 45 :: Views: 8665
pwm module for pic 16f737
hello all ...at first, sorry for my bad english...im get started to use pic 16f737 and i need some help with this pic...if someone can help ill be very happy...-someone have any good beginner tutorial that can help me with the pic 16f737, (about the ...
Microcontrollers :: 11 Oct 2009 21:04 :: wp100 :: Replies: 3 :: Views: 291
problem with wireless serial transmisson
hi, i am doing school project and have encountered a problem when using t5/r5 module and pic16f877 usart feature for rf communication.datasheet for t5/r5 module and my schematics are attached. basically, the route is t5 tx pin -> pic tx -> transmissi...
Hobby Circuits and Small Projects Problems :: 11 Oct 2009 12:37 :: Tracy Chin :: Replies: 6 :: Views: 459
[help]: brillouin diagram explanation needed.
hi.i encountered the attached dispersion diagram when reading a paper periodic analysis of a 2-d negative refractive index transmission line structure ieee transactions on antena and prop. vol. 51 no. 10 oct. 2003. it is said to be a brillouin diagra...
Electromagnetic Design and Simulation :: 11 Oct 2009 3:22 :: Ashubhu :: Replies: 6 :: Views: 1392
need help in designing simple regulator
hi all,i am doing a mini project of designing a simple reglator. i am looking online, but i do not find examples of designing regulators. i have studied the fundamentals of power electronics. it is a nice book but does not elaborate on how to design ...
Power Electronics :: 06 Oct 2009 21:22 :: Tahmid :: Replies: 3 :: Views: 165
economical way to drive a 16x16 led matrix
im thinking about building a large led screen out of 16x16 led panels. im trying to find out if i can do 240x96 leds (15x6 panels) reasonably economically. i have sourced the leds but am trying to find the driving circuitry without breaking the ban...
Hobby Circuits and Small Projects Problems :: 28 Sep 2009 8:15 :: betwixt :: Replies: 3 :: Views: 477
trying to run battery powered led lights on 110v system
so far i would like to use some led lights with a 110 volt inverter system because it seems they would use the least amount of power, but the only 110 volt bars of them ive seen have cost $50+ and i dont want to spent that much. i saw some that take ...
Electronic Elementary Questions :: 24 Sep 2009 5:08 :: senthilkumar.b :: Replies: 13 :: Views: 420
anyone worked on microcontroller based sinewave inverter
hi guys i am praveen working on sinusoidal based inverter got stuck in voltage control of sine wave inverter.is any one here to help me....
Microcontrollers :: 22 Sep 2009 6:48 :: bobcat1 :: Replies: 4 :: Views: 486
need help to implement this matlab code to calculate sfdr..
does anyone have implemented the codes below?im thinking that i put a sine wave as input of my 8-bit adc and take directly the output of my adc..am i right?and lastly how the file test.load look like or how is the arrangement of the data inside? this...
Analog IC Design & Layout :: 21 Sep 2009 15:39 :: kickbeer :: Replies: 2 :: Views: 429
voice record and playback device
i want to use a voice record and playback device.i used the isd1730 from winbond.does any1 know any other ic?i want to use it with a mcu..thanks in advance:-)i do not forget to press help.....
Microcontrollers :: 21 Sep 2009 8:23 :: xxtigerxx :: Replies: 9 :: Views: 1927
proteus dtmf encoder unit if you need it grab a copy
here is a data to dtmf tones dialer unit {not a decoder !!!}allows for several timing modes and full tones adjustment to reuse for other systems also can be reused as a submodel if you want to add other control logic and decoders as a unit submodel e...
Software Downloads/Uploads :: 16 Sep 2009 16:51 :: VSMVDD :: Replies: 0 :: Views: 351
what is best software to aid in antenna design?
hi all,may i know the pros and cons of the various commercial software for antenna design... example -->ansoft designer, microwave office etcthanksnewbie101...
RF, Microwave, Antennas and Optics :: 16 Sep 2009 15:49 :: 2009kucing :: Replies: 41 :: Views: 5001
meaning of "full wave" in hfss, references for fem
hfss is a high-performance full-wave electromagnetic(em) field simulatorhere what is the meaning of full wave electromagnetic field simulator?any good reference for fem and mom?any one have the below oneanalytical and computational methods in electro...
Electromagnetic Design and Simulation :: 15 Sep 2009 16:50 :: meta_artificial :: Replies: 6 :: Views: 403
antenna loading effect
how to estimate to loading effect of antenna?and how to solve it?for example,a monopole was put in handheld application, but there were earpiece, lcd ... i found the input impedance of the monopole was incresed and resonant frequency was shifted. one...
RF, Microwave, Antennas and Optics :: 15 Sep 2009 7:34 :: vfone :: Replies: 5 :: Views: 333
normally closed solid state relay
need a ssr that is nc in the off state (to pass 10a ac) then opens with gate drive. this will be across a 1.5uf as a short, then short removed and the ac current will pass through the 1.5uf capacitor.is this possible ?...
Analog Circuit Design :: 08 Sep 2009 20:21 :: Freddybaby :: Replies: 4 :: Views: 468
very tricky analog design
give you only three voltage a, b, and c, no other voltage available. that means you dont know which one can be used as supply voltage for decision circuit. the other difficult part is that at certain time a could be the smallest voltage, while at oth...
Analog IC Design & Layout :: 08 Sep 2009 18:18 :: bravo_echo_11 :: Replies: 8 :: Views: 686
digital variable resistor for ac power circuit
hi,i am working on a 230vac dimmer circuit,and has encountered a question.is there a digital variable resistor for 230vac.i dont think a digital potential meter will work on the variable resistor on a ac dimmer circuit.i saw on a website where it rec...
Electronic Elementary Questions :: 07 Sep 2009 17:09 :: nandhu015 :: Replies: 7 :: Views: 423
rtd interface circuit
i have pt-100i need circuit whose resolution is 1mv change for 0.1 degree c change.presently i am working with ckt whose resolution is 0.03mv for 0.1 degreec,but i dont want to operate in that region.any circuits of such kind?tks...
Analog Circuit Design :: 07 Sep 2009 14:29 :: vipul :: Replies: 6 :: Views: 1524
ac-dc power supply conversion - transformer selection
hi,i am designing one mini project.it requires ac-dc conversion as similar similar one used in the following university project. http://acme.cs.berkeley.edu/about.phpin this one, i have to select one transformer (power transformer) for my project. ap...
Hobby Circuits and Small Projects Problems :: 06 Sep 2009 6:53 :: nramesh :: Replies: 5 :: Views: 819
a few questions about digital step-km counter circuit/help
hi friendi have questions about below circuit & really need their answer soonhttp://ssrssd.persiangig.com/image/electronic/stepcount.gif[left]r1,r3____22k 1/4w resistorr2________2m2 1/4w resistorr4________1m 1/4w resistorr5,r7,r8__4k7 1/4w resi...
Electronic Elementary Questions :: 05 Sep 2009 15:04 :: Audioguru :: Replies: 5 :: Views: 291
how does this circuit 'zero?'
himy first post - for a very specific reason. i am an electronics engieer of 40 years standing but the vast majority has been in management and writing reports and documents, using no more than ohms law if im lucky. so i have got a lab together at ho...
Analog Circuit Design :: 04 Sep 2009 1:02 :: jamesinnewcastle :: Replies: 5 :: Views: 282
ac input to an adc...please help
hello there..i m using a microcontroller which has a built-in adc in it.. now i have to measure an ac signal using dat adc...can u please tell if the adc can measure the negative half-cycles of an ac signal..? or shud i give the signal thru some exte...
Microcontrollers :: 02 Sep 2009 17:31 :: daviddlc :: Replies: 6 :: Views: 324
high voltage high speed switching power supply needed
i am in need of an ultra high speed switching high voltage supply. 5kv is good and 10kv is better. 0 to full-voltage is okay, but -5kv to +5kv is better. all i need is a square wave with adjustable frequency. all i care about is how fast it can switc...
Power Electronics :: 30 Aug 2009 17:31 :: wahaha_86 :: Replies: 2 :: Views: 373
use an lcd ic to drive led matrix.
hi guys,i need to interface the attached st7066uv22 with a led matrix instead of a common lcd segment.can i drive a led matrix with this ic with a trasistor that interface the low power of the ic with the led?le led matrix is organized in row and col...
Microcontrollers :: 29 Aug 2009 22:07 :: Gigillo74 :: Replies: 10 :: Views: 579
ct60am-18f with ir2110 circuits
i want to design an inverter using sg324 but im not understanding where shld i give 230v 50hz input to the ic (at which pin) or shld it be converted to dc and then given...
Power Electronics :: 29 Aug 2009 17:30 :: madhurasugandhi :: Replies: 4 :: Views: 739
h bridge mosfet driver
i want chop 200v dc to 50hz sine wave.how can i do this with minimun losses.is it possible to use scr.i will need a sketch for illustration...
Power Electronics :: 28 Aug 2009 13:26 :: codewiz :: Replies: 10 :: Views: 2843
fullwave rectifier in hspice
hi,i tried to do a fullwave rectifier in hspice to test my ac input buck regulator. however, it seems that my filter capacitor is not working because the output of the rectifier is still a pulsating dc. is it because i have to use a polarized filter ...
Analog IC Design & Layout :: 24 Aug 2009 8:15 :: FvM :: Replies: 10 :: Views: 899
why switching speed of tunnel diode is more than ordinary pn
why do we say that the switching speed of tunnel diode is more than pn diodes? is it true that the electrons travel in the tunnel diode with a velocity comparable with the velocity of light?during tunneling why does the electron wave function penetra...
Electronic Elementary Questions :: 22 Aug 2009 20:45 :: ark5230 :: Replies: 1 :: Views: 174
measure the operating frequency of a dc-dc converter
i am trying to measure the operating frequency of a dc-dc converter, i do not have access to the internal circuitry of the converter, i can only measure the input and output pins. is there a way for me to do this? is the frequency of the ripple the s...
Power Electronics :: 21 Aug 2009 0:26 :: flatulent :: Replies: 1 :: Views: 206
what is diff between device simulator silvaco and hfss?
what is diff between device simulator silvaco and hfss?both are 3-d simulator...
Electromagnetic Design and Simulation :: 20 Aug 2009 7:03 :: timof :: Replies: 1 :: Views: 220
full wave analysis of closed microstrip line by mom method
hi,i have same problems in modélization of full wave analysis of closed microstrip line by mom method .can you help me ?je = Σq xq×gq je is a surface cournt densitygq is a test function xq is a coefficient...
RF, Microwave, Antennas and Optics :: 18 Aug 2009 20:27 :: speed20051 :: Replies: 0 :: Views: 117
non invasive car fuel level detector
hi there i want design a precise fuel level detector.what do you suggest to use as sensors/mechanical like the ones used in cars?ultrasonic?light?pls need your suggestions if someone has worked with it will be easier to eliminate options...
Hobby Circuits and Small Projects Problems :: 15 Aug 2009 13:27 :: pakitos :: Replies: 4 :: Views: 514
polarized capacitor in hspice help?
hi,does anybody know the hspice command for a polarized capacitor? i was trying to model a valley fill circuit and a full wave rectifier, and the capacitor i used does not work. i just used c (ex. c1 node1 node2 33uf). it is becuase the default capac...
Analog IC Design & Layout :: 07 Aug 2009 16:02 :: erikl :: Replies: 1 :: Views: 135
mosfet drivers containing components for bootstrap circuit
hey there...im currently working on a pure sine wave power inverter. the worst part is getting the fet drivers for the full-bridge output stage to work properly. im currently trying out the ir21xx range of drivers. surely there has to something that ...
Hobby Circuits and Small Projects Problems :: 03 Aug 2009 15:28 :: harimelath :: Replies: 1 :: Views: 357
rf microwave tools part 1 - part 64
9705-1.pdf diode model parameter extraction from manufacturers data sheets9708-1.pdf pin diode model parameter extraction from manufacturers data sheetsdbm.zip displays rf power and voltage realtionsnetwork.zip either an ac network anal...
RF, Microwave, Antennas and Optics :: 29 Jul 2009 6:14 :: sivanandyala :: Replies: 5 :: Views: 5549
power supply problems - l7805 on breadboard
ok i have a 240v to 6v ac transformer. it has a maximum current output of 1.2a.i connected it to a diode rectifier and it produces 6.45v dc. when i connect this to my micro controller circuit, the micro controller doesnt initialize and my circuit doe...
Hobby Circuits and Small Projects Problems :: 22 Jul 2009 11:35 :: JoKKeR :: Replies: 18 :: Views: 666
pure sine wave inverter
im a student, im doing a project of pure sine wave inverter. i got the pure sine wave inverter from internet, but the output is too small which is 120vac from 12vdc input. 1) please give me some advice that how to modify it so that it give a output o...
Electronic Elementary Questions :: 21 Jul 2009 19:38 :: svhb :: Replies: 2 :: Views: 762
mosfet burning problem in ups
i want to discuss about the problem which i am facing...........i have a local microcontroller based ups in which mosfets are used as switching inverter. total six mosfets are used in 2 sets of three parallel mosfets.the mosfets used here are irf3205...
Hobby Circuits and Small Projects Problems :: 19 Jul 2009 20:15 :: ifithegr8 :: Replies: 23 :: Views: 2841
motor controller l297... need help
good day... too many question to ask... please help...this is the data sheet i need help onhttp://www.st.com/stonline/books/pdf/docs/1334.pdfthe l297 integratesall the control circuitry required to control bipolar and unipolar steppermotors. used wit...
Industrial, Robotics and Automatics Forum :: 19 Jul 2009 20:08 :: mona653pak :: Replies: 31 :: Views: 7016
full wave rectifier using mosfets??
hi all,i would like to ask about the possibility of rectification of ac input using mosfets instead of diodes....is that possible that by replacing all 4 diodes with 4 n-mos for rectification with proper gate control circuit?the reason of using mosfe...
Power Electronics :: 18 Jul 2009 8:55 :: walkura :: Replies: 7 :: Views: 984
problem in l297
hii am using l297 and l298 to drive a unipolar stepper motor with 555 timer circuit which was connected to the clock pin in the l297 chipfirst i connected the l297i connected sync, /reset, cw//ccw, h/f, enable to vcc and the freq out of 555 is 0.6 hz...
Industrial, Robotics and Automatics Forum :: 15 Jul 2009 21:17 :: ahmed_14 :: Replies: 1 :: Views: 455
how can i make a pcb at home ?????
i tried many times to make a pcb using positive 20 photo resist but everytime i got bad results,although i got almost good results using hot clothes iron to make pcbs, but still i cant get small diminsions, also sometimes, some tracks vanich!!can any...
Hobby Circuits and Small Projects Problems :: 12 Jul 2009 20:53 :: Ave_Rapina :: Replies: 96 :: Views: 13062
best 3d em simulator
what is the best 3d em simulator?regards...
Electromagnetic Design and Simulation :: 11 Jul 2009 22:24 :: emcguy :: Replies: 55 :: Views: 9460
opamp gbp
the output of my sensor is a sinosoidal (40khz) voltage of 20mv p-p and i need to amplify this signal without distortion and/or clipping to 5v p-p.i have opamps available with me that have gbp ranging from 500khz to 1mhz.assuming i keep a 20% margin ...
Analog Circuit Design :: 08 Jul 2009 13:02 :: millwood :: Replies: 31 :: Views: 833
h f s s vs c s t
does anyone can give a comment on this topic?which is one is better. ive experience in h f s s and found that it is pretty slow and memory hungury. for a circuit with two plannar inductors, it takes on more than 1gb memory. does cst offer anything be...
Electromagnetic Design and Simulation :: 05 Jul 2009 11:03 :: shazdek0ch0l0 :: Replies: 140 :: Views: 30865
digital oscilloscope project
hii m studying possibilities to make a digital oscilloscope for pc, with onboard ram to memorize samples.i have several questions : => wich bus is the easier to use (hard and driver for linux/windows) : pci, usb or ieee1394=> i though about using man...
Hobby Circuits and Small Projects Problems :: 03 Jul 2009 12:05 :: millwood :: Replies: 474 :: Views: 271765
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