55 Threads found on edaboard.com: Photo Coupler
Hi All
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 :: 08.04.2009 14:14 :: srinu9009 :: Replies: 5 :: Views: 1275
I experienced once, back in year 2000, my sensing system encountered the transient which was emitted from motors in the conveyor area, may be from inverter near by. At that time, I did know much about this industrial hazard environment, the design lack off filter, photo coupler. Since then I opted for Atmel?s MCU.
However, Recently, I had made
Robotics and Automatics Forum :: 22.07.2004 17:23 :: vrasak :: Replies: 38 :: Views: 8900
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 :: 17.10.2004 16:57 :: g579 :: Replies: 4 :: Views: 2783
Hi FANT,
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
g579
RF, Microwave, Antennas and Optics :: 02.12.2004 01:06 :: g579 :: Replies: 21 :: Views: 8447
Thanks all
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
----------------
chmr
Analog Circuit Design :: 14.01.2005 01:55 :: chmr :: Replies: 8 :: Views: 1390
Your last posts made a bit clear the situation. What you have is a pair of wires coming from the alarm. One end of these wires is connected to the ground (chassis) of the alarm and the other one, when the push button is not hit, is floating without any contact to the alarm.
If the above is right, my guess is that some transient due to the changi
Analog Circuit Design :: 05.04.2005 04:10 :: nandopg :: Replies: 21 :: Views: 2553
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 :: 30.09.2005 03:19 :: id_guy :: Replies: 2 :: Views: 522
--------------------------------------------------------------------------------
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 (...)
Electromagnetic Design and Simulation :: 30.09.2005 03:31 :: id_guy :: Replies: 6 :: Views: 748
check this one may be helpful
Analog Circuit Design :: 19.12.2006 17:49 :: artem :: Replies: 12 :: Views: 2508
The circuit as presented by FvM will work. The values you propose should also work. You do not need to worry too much about any resistor in series with the cap, as that will only add a zero to the loop. You need a slow circuit for now, to make sure you got the regulation right. Then we can talk about transient performance.
Again, the LED curr
Professional Hardware and Electronics Design :: 24.02.2009 18:38 :: VVV :: Replies: 32 :: Views: 5797
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 :: 30.03.2009 12:23 :: rfsystem :: Replies: 2 :: Views: 913
Hi all.
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 :: 09.02.2010 03:38 :: marco0674 :: Replies: 3 :: Views: 676
1. I dont totally understand what do you mean by 'requirements', but following is a brief description of this project.
A circular plate with a single slot is attached to the shaft of the motor. A photo coupler is placed such that the beam gets cut once on one complete rotation of the shaft. Those cuts are translated into HI/LO levels or counts cou
Microcontrollers :: 09.10.2010 15:38 :: khansaab21 :: Replies: 5 :: Views: 525
Use photo-coupler/ optocoupler like a ET110 3. But I am not clear what you're trying to accomplish. If want to signal to signal transfer try that method. If you want one signal on and off the circuit, use J-k flip flops. If you have the necessary circuitry, I provide you more in depth help.
Hobby Circuits and Small Projects Problems :: 12.07.2011 00:04 :: AmericanCircuitTech :: Replies: 3 :: Views: 1042
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 :: 03.09.2011 15:23 :: FvM :: Replies: 1 :: Views: 981
Optocouplers (Optically Coupled) and Fotocouplers (photocouplers) are same thing. Fotodarlington coupler have a Darlington Transistor in its output.Here are the images of a transistor output Optocoupler and a Darlington Transistor output Optocoupler.
61464
61465
Power Electronics :: 14.09.2011 17:17 :: Raza :: Replies: 3 :: Views: 704
Hi all,
I'm trying to understand how this particular opto-coupler works internally.
Unfortunately i have not found any sufficient useful description on the way the internal section works.
75279
I'll be glad if someone could elaborate on the way the photodiode works in the way it is connected according to the scheme
Analog Circuit Design :: 02.06.2012 12:09 :: TripACT :: Replies: 8 :: Views: 576
I have 3 of these I am wondering if they are bad.
On one side
reads same regardless of polarity
1k
1k
21k
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.
Thoughts?
will PC 817 versus EL 817 work the same?
Electronic Elementary Questions :: 05.11.2012 18:08 :: sdowney717 :: Replies: 0 :: Views: 144
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 :: 14.12.2012 09:01 :: HTA :: Replies: 8 :: Views: 269
@monnoliv
Some suggestions:
1) I think you need to change the input stage sensitivity.
Standard voltage range for an oscilloscope is 14 positions from 1mV/div to 20V/div in (full 8div range: 8mV/8div - 120V/8div) in 1-2-5 sequence:
1mV/div, 2mV/div, 5mV/div, 10mV/div, 20mV/div, 100mV/div, 200mV/div, 500mV/div, 1V/div, 2V/div, 5V/div
Hobby Circuits and Small Projects Problems :: 11.06.2004 17:19 :: ME :: Replies: 490 :: Views: 371542
see this ICD2 4550 in thailand web :D
Microcontrollers :: 13.12.2006 08:22 :: SPATAN :: Replies: 1853 :: Views: 470469
hi everyone ,
can i use an ir module (the one with 3 pins) instead of a phototransistor ,if yes, how can i do that , i mean what should i change ? whats the main diffrence between the 2 solution ?
Hobby Circuits and Small Projects Problems :: 05.06.2006 11:46 :: hassenman :: Replies: 5 :: Views: 748
There are some differences, but both devices operate on the same principle of having excess electrons in the conduction band of a semiconductor, and arranging it so that the electrons recombine with holes in a radiative fashion, giving off light in the process. What is different about a laser? In an LED, the electrons recombine in a random and unor
Electronic Elementary Questions :: 29.06.2006 08:20 :: sanjiv :: Replies: 18 :: Views: 4089
opto coupler is used for the isolation between the input high voltage side and the low output side.
it controls the tiny swithching frequency.the output of the opto is connected to the EN pin of the TNY.the output current of the photo opto coupler,ie the current through the output diode of opto is controlled by the input voltage of the (...)
Analog Circuit Design :: 29.03.2007 10:57 :: cameo_2007 :: Replies: 4 :: Views: 1437
Hi, Taner and maharadga.
I'm so confuse about these results:
1st--> when I removed transformer ,the signals shows normal.
(standby mode-->g/r blink then green blink , overtemp-->red blink)
2nd--> after I connected transformer and then connected load, L
Professional Hardware and Electronics Design :: 14.03.2009 15:45 :: voravat :: Replies: 928 :: Views: 236743
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EDA Jobs :: 14.11.2007 04:47 :: SWAPI :: Replies: 3 :: Views: 8583
Hi,
I'm developing Motor Speed Controller for Permanent Magnet Synchronous Motor(PMSM).I don't 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 equiped with transistors.I have my university final year project that is SCR based DC motor(1-p
Microcontrollers :: 25.12.2007 14:57 :: umery2k75 :: Replies: 18 :: Views: 42492
i believe photodiode can be used for analog cases with a properly modulated light source like LED....
Analog Circuit Design :: 02.02.2008 17:43 :: A.Anand Srinivasan :: Replies: 15 :: Views: 5071
Manipulation is easier than practically implimenting it. Did you work this inverter sucessfully?...May i please request the photos of the same?..Reagards
Power Electronics :: 01.06.2009 07:12 :: pranam77 :: Replies: 251 :: Views: 49543
Hi Everyone,
I hope someone here may be able to help me.
I have an offline UPS made by a local manufacturer who has since closed his business.
The circuit uses a SG3524N PWM controller, three AS324P quad op-amps, a MOC3021 opto-coupler and six P55NF06 MOSFETs to give a 220vac/50Hz (600 VA) output from a 12vdc/31AH lead-acid car battery.
Service Manuals, Requests, Repair Tips :: 24.08.2009 08:58 :: scorpio_stg :: Replies: 4 :: Views: 2021
How can I measure the impedance of a small coil like the attached photo? Coil is 2mm coper wire located inside a quartz tube (4 mm diameter for water cooling). Coil diameter is 2.5 cm and lenght is 2.8 cm both like this and while plasma is ignited and coil is
RF, Microwave, Antennas and Optics :: 29.09.2009 08:27 :: steve_rb :: Replies: 5 :: Views: 873
On the generator I went up to 2000W and checked returned power is almost zero on the generator. What is the correct current and wattage inside the coil?
On the automatcher I can see peak to peak voltage is 2000 V. No trace of arc and no extra heat on the contacts. Everything seems very normal except there is no stronge plasma as I was expected.
RF, Microwave, Antennas and Optics :: 26.06.2010 16:26 :: steve_rb :: Replies: 5 :: Views: 1111
I understand, that you are operating the photodiode in photoelemnt mode? Then the measurement is incorrect, because the photodiode juntion is connected in parallel to "Q1" BC and BE junction. But you are measuring only the the current amount through BE. To measure the full photocurrent, you must bypass a (...)
Electronic Elementary Questions :: 04.09.2010 00:00 :: FvM :: Replies: 11 :: Views: 933
LDR response is always slow and in addition, it gives a voltage out which is proportional to the amount of light, what you want is an abrupt voltage change when the light is interrupted. I suggest using a photo-transistor or photo-diode instead of the LDR. A better alternative, if you can mechanically mount it is to use a slotted (...)
Microcontrollers :: 19.10.2010 14:58 :: betwixt :: Replies: 28 :: Views: 1544
Actually, I've found out that the Y does a better job for me than the delta configuration. A simple 6db resistive splitter in Y has about 8dB of loss at 20GHz. See attached photo of the
PS: @fenfei, use two 33R in p
RF, Microwave, Antennas and Optics :: 19.12.2010 23:50 :: rfmw :: Replies: 6 :: Views: 731
This is the reason that when using a higher IF frequency than RF, always is used high LO injection (above IF), which leads to a higher image frequency, and better image rejection.
So It should be like the photo, using the low IF in such a configuration for further filtering?
RF, Microwave, Antennas and Optics :: 28.03.2011 12:20 :: neazoi :: Replies: 20 :: Views: 929
I'm currently designing a circuit involving voltage controlled resistance. So far i've made simulations which proove, that this method is possible, but involves lots of auxiliary components.
Currently I'm going to experiment with photoresistors (i've seen some optocouplers with photoresistor output). photoresistors may (...)
Analog Circuit Design :: 06.07.2011 03:49 :: poorchava :: Replies: 9 :: Views: 1060
Opto-couplers / Opto-isolators ::
Microcontrollers :: 15.07.2011 13:59 :: nserudin musa :: Replies: 3 :: Views: 838
ah okay so this is the logic.. when the zero crossing is detected we activate our pwm or that's the time we drive out pwm to the gate of triac ?
Correct, I have posted a couple of photos showing the resulting AC waveform along with the PWM controlling the
Microcontrollers :: 19.07.2011 08:44 :: bigdogguru :: Replies: 136 :: Views: 8541
Hello ,
I want to design a Half-bridge circuit with IR2110 to drive an 60W ultrasonic transducer which operates at 35-40khz and 600V. first I generate PWm signal via PIC IC's CCP module on half bridge mode. Then I amplify this signal to 12V. IR2110 operates 12V too.. Here is my
Power Electronics :: 01.11.2011 21:14 :: ultrasonic :: Replies: 120 :: Views: 37549
Dear FVM,
As you know usually opto coupler chip only contain 2 part(opto sender & receiver) and component haven't other discrete Vcc and GND. thus we can drive both photo transistor and led by different biasing . am i true or no?
Regard
Electronic Elementary Questions :: 13.08.2011 20:51 :: dv_sa559 :: Replies: 18 :: Views: 563
Here's a suggestion to improve this circuit. :-D
Try to redesign the circuit in order to increase the LEDs current intensity, to obtain a true photo flash effect, as for this application LEDs are supposed to be powered up only for a short period of time and by keeping the pulse with duty cycle short, the LEDs will not overheat.
In order to
Analog Circuit Design :: 22.09.2011 17:01 :: mister_rf :: Replies: 27 :: Views: 543
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Business, Promotions, Advertising :: 14.10.2011 09:51 :: dhxiang517 :: Replies: 0 :: Views: 364
i found this circuit
4utatxv5ntkqhxofwxov.png - - udost
i tested it in protues and it work true.but where is a problem in reality.
in protues first time when i run it, output is off (i want it) but when i make circuit and connected voltage,first time output if on.
Electronic Elementary Questions :: 21.11.2011 22:25 :: javadamirpoor :: Replies: 9 :: Views: 387
How did you deduce that it is this pin that is causing the problem, and not some other part of the circuit?
If, however, it IS this pin causing the problem, maybe somehow false triggering the photo-transistor, you can pull down this pin with a 10k resistor to ground.
Hope this helps.
Tahmid.
Microcontrollers :: 16.02.2012 18:01 :: Tahmid :: Replies: 19 :: Views: 451
I've found another interesting image at RFbeam for radar sensor, transceiver modules, test systems, doppler modules, planar arrays
quality is very poor, because only small image available, so i made it a little bigger to put my
RF, Microwave, Antennas and Optics :: 26.02.2012 11:58 :: Terminator3 :: Replies: 34 :: Views: 1502
If you don't need fast switching, photo MOS Driver is good.
Like photo mos Relay, you can drive N-MOS.
Power Electronics :: 05.03.2012 00:35 :: YAS_HASHI :: Replies: 20 :: Views: 1079
The system starts usually at 40ms shutter open and generally ends up at shutter open for about 20 seconds.
Oops. I thought you were bulb-ramping with a fixed interval, but you're obviously interval ramping as well. btw, I've belatedly looked at your website and followed the links so I now have a bit better unde
Hobby Circuits and Small Projects Problems :: 11.05.2012 15:00 :: godfreyl :: Replies: 15 :: Views: 1171
You didn't yet talk about supply voltage. 13 A is an absolute maximum rating and hasn't to do with thermal safe operation of the device. You should always check average power supply and case temperature if possible. I presume correct transistor mounting on the heat sink.
The indicated operation mode "The upper transistor is in class AB, the bott
RF, Microwave, Antennas and Optics :: 31.05.2012 12:11 :: FvM :: Replies: 11 :: Views: 385
that's not true may be an antenna has two or four port
Agreed, but it is not usual. I can't think of any antenna designed for a single frequency where there will be more than one input port. For this particular design created by the HFSS antenna design kit, I have absolutely no idea how one is supposed to use it. If
Electromagnetic Design and Simulation :: 12.06.2012 07:42 :: DeboraHarry :: Replies: 7 :: Views: 928
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