1000 Threads found on edaboard.com: Photo Coupler
I am using Two optocouplers to my inverter mains mode to invereter mode application.I used one opto coupler for zerocrossing detector and another for mains sensing voltage.i connected these optocouplers inputs in it working at all conditions?i am sending schematic as file.
if optocouplers inputs connected in (...)
Analog Circuit Design :: 04-08-2009 08:14 :: srinu9009 :: Replies: 5 :: Views: 1555
The circuit that I post was my boss give,but it can't work,the MOSFET is not seens there has some problems in the photo coupler circuit.
Can anyone tell me how to modify the circuit,but the only and most important is "cost".
Thanks a lot
Analog Circuit Design :: 01-13-2005 19:55 :: chmr :: Replies: 8 :: Views: 1679
check this one may be helpful
Analog Circuit Design :: 12-19-2006 11:49 :: artem :: Replies: 12 :: Views: 2947
I need some help with circuit in the attached file.
I need to momentary trigger a 240V relay through body capacitance.
Relay must be on just until I keep my finger on the touch plate.
I could design the circuit in file: from the upper part I get 12V and, with the Q9 transistor I can have 12V on C3 as long as I keep my finger on the touc
Analog Circuit Design :: 02-08-2010 21:38 :: marco0674 :: Replies: 3 :: Views: 835
I have 3 of these I am wondering if they are bad.
On one side
reads same regardless of polarity
on other side of photo coupler
polarity reversed polarity
5.6m ohms 5.6 m ohms
5.6 m ohms 5.6 m ohms
9.7 m ohms open
These are in circuit tests.
will PC 817 versus EL 817 work the same?
Electronic Elementary Questions :: 11-05-2012 12:08 :: sdowney717 :: Replies: 0 :: Views: 250
In photo coupler Whether I/O Capacitance and Capacitance coupling are same? Can any one clarify me??
Professional Hardware and Electronics Design :: 05-20-2014 03:19 :: Sindhuveee :: Replies: 0 :: Views: 235
Hi sergio mariotti,
1. Unfortunately I have no access to such wideband directional bridges/couplers. I'd be grateful, if you can post or PM a sketch, a photo, or some draft drawing of such units.
2. The mentioned HP/Agilent models not just the upward extensions of the usual directional bridges (I have seen several up to 1 GHz), where the throug
RF, Microwave, Antennas and Optics :: 10-17-2004 10:57 :: g579 :: Replies: 4 :: Views: 3414
These days I'm trying on a 40db coupler and the isolation is respected to be greater than 25db,while by using HFSS9.0 I got only 20db.How to improve the fact?
I used a stripline coupler,a very simple model.you can see from the photo.
Hope someone nice can help me ~~please.
Another,how to perform the mesh operation?I mean in a model some (...)
RF, Microwave, Antennas and Optics :: 09-29-2005 21:19 :: id_guy :: Replies: 2 :: Views: 789
The optocouplers BJT differs from a standard BJT that the area is much bigger to receive more infrared light and the base depth is much bigger to absorb a big part of the infrared. That has two consequences.
1. The internal Ccb is high.
2. The base transit time is high
If the collector current is not driven into low ohmic virtual ground th
Analog Circuit Design :: 03-30-2009 06:23 :: rfsystem :: Replies: 2 :: Views: 1110
For analog applications, there are two options to speed up an opto-coupler
- use it in current source mode, e.g. a cascode circuit or another means that creates a low (AC) load impedance, to overcome miller capacitance.
- use it as a photo diode. In this case, you'll need the base terminal.
Did you check, if the opto coupler pole is (...)
Power Electronics :: 09-03-2011 09:23 :: FvM :: Replies: 1 :: Views: 1339
You conclusion 1/2/3 should be o.k. The purpose on a opto coupler is to isolate two systems(GND and Vcc). The MCU output is driving the diode side and the photo transistor the isolated system side. For the other direction it is just opposite. The absolute maximum ratings in the data sheet is not the operating condition. These are the electrical ch
Electronic Elementary Questions :: 12-14-2012 03:01 :: HTA :: Replies: 8 :: Views: 607
The coupler looks like
In the catalog photo, one port is terminated with 50 ohms, the other with a N connector.
RF, Microwave, Antennas and Optics :: 07-02-2013 14:27 :: FvM :: Replies: 4 :: Views: 641
whoever has experience on design microstrip 90-degree hybrid(not use lange coupler) for bandwidth of 4:1 or larger,I just want to know how to realize it?thx.
Other Design :: 03-08-2002 20:34 :: Needbias :: Replies: 8 :: Views: 3158
I have to use a very long lange coupler in respect to my chip dimensions (It's a GaAS MMIC). Can someone give me an advice about how to bend the lange coupler? For example in a U shape?
Other Design :: 08-01-2002 05:26 :: Tomp :: Replies: 1 :: Views: 2140
U can find photo diode model in the opto library of pspice
PCB Routing Schematic Layout software and Simulation :: 02-12-2003 00:06 :: mvvijay78 :: Replies: 2 :: Views: 3715
Attached an old article from DUBUS about the project of a directional coupler; have a look at the three last pages.
Hobby Circuits and Small Projects Problems :: 01-21-2003 15:28 :: FANT :: Replies: 0 :: Views: 1480
Hi, I'm looking for any information about possible topologies of 135° Hybrid coupler (3dB) with in L-Band.
Thank you in advanced.
RF, Microwave, Antennas and Optics :: 01-23-2003 04:58 :: riskio :: Replies: 4 :: Views: 1223
In this forum,I think there have many expert on coupler design.but how to just use software, such as ads2002 or microwave office to design a 3-dB stripline coupler?I use mutilayer model of ads2002,but the result seems not very good.wish expert give me some advice.
RF, Microwave, Antennas and Optics :: 02-16-2003 07:09 :: Needbias :: Replies: 16 :: Views: 3579
okay I found it if you interested in this topic take look......
A variety of soldermasks have been selected to fill the needs of our customers. The following is a description of the soldermasks currently available. The need for closer tolerances has driven the implementation of photo-imageable soldermasks.
PCB Routing Schematic Layout software and Simulation :: 03-04-2003 10:11 :: H_u_n_t_e_r :: Replies: 1 :: Views: 1489
i need to implement a 4x4 butler matrix using microstrip and to avoid line crossover (overlap), i would like to use a 0 dB coupler, but can't find any article describing how to design it. can you please help me?
thanks in advance :)
RF, Microwave, Antennas and Optics :: 03-19-2003 06:33 :: rfdipper :: Replies: 1 :: Views: 1876
Does anyone have a spice model for a MOC3052 opto coupler. Thanks
PCB Routing Schematic Layout software and Simulation :: 04-15-2003 08:29 :: KaSpeR :: Replies: 1 :: Views: 3267
I want to design a wideband direct coupler with small size from 100MHz-500MHz.Could you give me some advice?
The peak power level over 150W.
RF, Microwave, Antennas and Optics :: 05-16-2003 21:13 :: goldensol :: Replies: 8 :: Views: 3454
I'm looking for some dual-channel phototransistors or photodiodes in the side looking packages with shutters and very smalll gap between these shutters. I found out only dual-channel phototransistor PT2559B from Everlight. Does anybody know any alternatives or any others?
Professional Hardware and Electronics Design :: 07-10-2003 06:13 :: kovalja :: Replies: 6 :: Views: 1630
Does anyone know how to design a high directivity coupler such as wiggly line microstrip coupler,I need the formulas,Thank in advance!!!
RF, Microwave, Antennas and Optics :: 07-11-2003 06:47 :: Needbias :: Replies: 6 :: Views: 2970
i need to numerical solution(finite element) in chirowaveguide(planar waveguide) and solution wave equition in directional coupler used chiral materials(planar chirowaveguide.
can i used in matter the softe wair ,namly ANSIS or HPHFSS?
can you found the thesis in matter? :cry: :cry: :cry:
RF, Microwave, Antennas and Optics :: 08-31-2003 08:41 :: carrier :: Replies: 1 :: Views: 1000
can sombody help? i want to design a directional coupler at 27Mhz. power 50 watts. directivity 20 db or better.
thanks in advance
RF, Microwave, Antennas and Optics :: 09-11-2003 08:51 :: venus :: Replies: 6 :: Views: 2949
how about the bandwidth & frequency character compare with Branch-line coupler & Ring coupler?
RF, Microwave, Antennas and Optics :: 09-23-2003 22:50 :: littlemmx :: Replies: 6 :: Views: 1343
This dual photo sensor is a photodiode?
I need the internal schematic, and the specifications.
Thanks in advance
Hobby Circuits and Small Projects Problems :: 10-23-2003 10:38 :: bomba :: Replies: 0 :: Views: 1174
I'm designing a mode coupler that will couple the TE21 mode to four external rectabgular waveguides. If you know this structure you know that it's pretty big and it's time consuming to solve it in HFSS (which I have access to BTW).
So is there a better alternative out there? I have heard that some people swear by WASP NET and others like
Electromagnetic Design and Simulation :: 10-30-2003 16:10 :: kazam :: Replies: 2 :: Views: 2195
i am doing a coupler(800--200MH),with striplines,
but the directivity is bad in high frequency ?
can any one help me?
is there any useful information about the coupler
RF, Microwave, Antennas and Optics :: 12-19-2003 03:37 :: qiang :: Replies: 7 :: Views: 1177
hi ,here some design of 90 coupler using epsr=2.2,h=.7874mm=31 mils
RF, Microwave, Antennas and Optics :: 02-24-2004 03:29 :: abdoeng :: Replies: 2 :: Views: 1151
For single balance mixer design use for upconvertor which coupler is best if RF is of 100MHz is to be coupled with local osc freq of 2GHz and if RF is of 500MHz is to be coupled with local osc freq of 8GHz.
RF, Microwave, Antennas and Optics :: 03-04-2004 05:15 :: zeshan102 :: Replies: 1 :: Views: 921
Hi all, I need some info about how to use a Lange-coupler with amplifiers.
I know that a Lange coupler is a for port device, 1 input port, and one isolated and two ports to where the power is splitted equally.
The exercise for me is to "construct a balanced amplifier using the same transistor as in exercise ..."
This confuses me, because h
RF, Microwave, Antennas and Optics :: 03-07-2004 07:56 :: StoppTidigare :: Replies: 4 :: Views: 1474
I need design a waveguide coupler ,center frenquence 37.5GHz,coupling is -4dB.who can give me some suggest or papers?
RF, Microwave, Antennas and Optics :: 03-11-2004 07:37 :: microwaveboy :: Replies: 0 :: Views: 839
I want to design the coupler between RF waveguide and cavity of a linear accelerator.
I heard about HFSS, HFWORKS, MAFIA, ...
Please help me to choose the best software by comparing them
Electromagnetic Design and Simulation :: 03-13-2004 03:21 :: LINAC :: Replies: 5 :: Views: 1373
i need to know what is the code
of the parallel com when i print photo using parallel com
i want to understand it to find out
how can i use it
Professional Hardware and Electronics Design :: 03-16-2004 20:13 :: scorpionss22 :: Replies: 0 :: Views: 783
I need design the waveguide coupler for 8mm,the coupling is -4dB and -7dB,the direction is -20dB or -25dB.I want to know which type maveguide coupler can be used.give me some suggest.
RF, Microwave, Antennas and Optics :: 03-20-2004 04:27 :: microwaveboy :: Replies: 1 :: Views: 916
application in phase shifter is better !
RF, Microwave, Antennas and Optics :: 03-22-2004 02:22 :: cdlonesome :: Replies: 3 :: Views: 1499
I interest in development high res digital photo comera for robot vision. I have many info on image sensor manufacturer, but I have not enouth info on photo camera demo or eval board manufacturer. Please send me this info.
RF, Microwave, Antennas and Optics :: 03-25-2004 01:48 :: steshenko :: Replies: 2 :: Views: 849
Please kindly advise the difference between 3dB coupler and directional coupler in function ??
RF, Microwave, Antennas and Optics :: 04-01-2004 00:10 :: Wilson98 :: Replies: 6 :: Views: 6288
I'm searching a 4 ports directional coupler with the following specifications:
Input Power : up to 30W
Frequency : between 800Khz and 4Mhz
Someone can give me a surface mount component reference or a manufacturer or a schematic ??
RF, Microwave, Antennas and Optics :: 05-17-2004 12:28 :: bobytronic :: Replies: 3 :: Views: 1733
i want to design a lange coupler use em simulation.
can any one give me an example and these applications?
ADS,MWOFFICE,HFSS,CTS which software sould i choose?
RF, Microwave, Antennas and Optics :: 09-14-2004 23:17 :: wjnbry :: Replies: 7 :: Views: 2252
I am looking for a chip which can get a digital image (like JPG, JPEG ) as input and convert it to S-Video / VGA / SVGA so I can show the photo on my TV screen.
Can someone help ?
Other Design :: 09-22-2004 11:28 :: rzohar :: Replies: 4 :: Views: 1467
hi everyone , i am doing a project on power line carrier communication,
i am managed to get a modulated FSK signal which i am going to ride over a 50Hz/220VAC line. i am using a 89C51 microcontroller and XR2206 as a modulator. i need help in a line coupler/driver.
Also in the contruction of the transformer coupling my transmitter to the mains. i
Digital Signal Processing :: 10-08-2004 16:21 :: snabilat :: Replies: 1 :: Views: 974
I need to design branchline coupler for 63.87 MHz. Lambda/4 becomes 117.4 cm. by using dielectric substrate with epsilonr equals to 4.7, lambda/4 is 54.16 cm.
I fabricated a coupler with this value. however I get isolation equals to 0.3 and other S parameters are not as I expected.
Is there anybody who constructed a coupler before and (...)
RF, Microwave, Antennas and Optics :: 10-25-2004 19:30 :: haydar :: Replies: 20 :: Views: 1555
I'm looking for info about the max power that i can put into coupler, for any load.
i can design it on barilyum. so my problem is the max voltage that will not make a problem
i'm working at s band,
RF, Microwave, Antennas and Optics :: 11-03-2004 09:01 :: eladg :: Replies: 2 :: Views: 675
hi all complete design of directional coupler under hfss.i hope help
Electromagnetic Design and Simulation :: 11-12-2004 22:57 :: abdoeng :: Replies: 0 :: Views: 1281
I need some help in designing a 4-port TE10mode rectangular waveguide at 14.5GHZ.
WG/18 Freq: 11.9Ghz - 18.0Ghz
Dimension: 16.0mm x 7.9mm
Coupling factor: -20dB
I need to know how many holes and the dimensions of each hole to drill on the waveguide.
Any references is welcome.
RF, Microwave, Antennas and Optics :: 11-21-2004 21:15 :: joelim_19 :: Replies: 3 :: Views: 1304
I'd appreciate if you could post (perhaps PM, not to overload the list) a few photographs from different angles on the directional bridge of the 8753 VNA.
One can always learn a lot, knowing how HP realize things that are difficult to do.
Thanks in advance
RF, Microwave, Antennas and Optics :: 12-01-2004 19:06 :: g579 :: Replies: 21 :: Views: 9827
Anyone have any idea about a coupler wich should couple 2 signals, one in 1240MHz with 50KHz BW, and another in 1252 MHz with 16MHz BW. signals have different power, and the coupler should be as compact as possible, and should be a microstrip type.
I think a filter should be design for each signal to force each input port to not sea the other; by
RF, Microwave, Antennas and Optics :: 12-09-2004 14:38 :: mamali :: Replies: 4 :: Views: 730