1000 Threads found on edaboard.com: Optocoupler Circuit
will this ckt work??
R1=R2=22k 2 watt..
whether it will blow the optocoupler ??
please help... .
Reverse diode is usually not included into the photocoupler and must be added..
this could be work ...
without transform this output as DC average...
I suppose you will send the square 50Hz signal in
Microcontrollers :: 01-17-2014 13:50 :: paulfjujo :: Replies: 5 :: Views: 986
I am designing an electronic ckt on Orcad for Nacelle system and I hav to use an optocouplers HCPL-5500, 5600. When I used the HCPL-2601 optocoupler I am getting so many warnings like :No PSpiceTemplate for ISO3, ignoring....
Can anybody help me to find the equivalent diagram for this optpcoupler......
Electronic Elementary Questions :: 07-27-2009 06:08 :: anjali1234 :: Replies: 1 :: Views: 1693
You could use linear opto coupler for this purpose.
Analog Circuit Design :: 11-12-2009 12:03 :: Siniąa :: Replies: 6 :: Views: 1756
i need the simplest U-shaped optocoupler circuit diagram...i am to meaasure the speed(RPM) of a dc-fan controlled by a miocrocontroller....plz help me out!!
Electronic Elementary Questions :: 05-13-2011 23:08 :: ali ghafoor :: Replies: 3 :: Views: 2405
I am using TLP181 optocoupler for turning on light with 12 v source. The device should turn on when signalled from microcontroller (ATmega128) PortB.0 to input of optocoupler. The curcuit looked simple but although there is voltage from microcontroller, it fails to turn on. What is the problem ?
optocoupler that I am using is TLP181. (...)
Hobby Circuits and Small Projects Problems :: 04-23-2014 05:43 :: sujan_014 :: Replies: 8 :: Views: 340
I'm working on a protection circuit for a pxi interface.
Basically I have to isolate the DUT from the command circuit through a pcb
that protects galvanic/ against Esd/ against UnderVolt-Overvoltage.
Now I've chosen an optocoupler for the galvanic isolation.
But I need to be protected also against Esd.
Where these (...)
Analog Circuit Design :: 02-14-2006 07:16 :: rellutzu :: Replies: 1 :: Views: 1145
I have a circuit that contains 5v, 24v and 48VDC. I don't want to use optocoupler, because i want to keep the cost low and the circuit simple. What do you suggest me about this? Must i use or not? What problems may i encounter? Or what can i do instead of using opto to prevent problems?
Hobby Circuits and Small Projects Problems :: 09-10-2003 16:54 :: seyyah :: Replies: 5 :: Views: 2466
optocoupler temperature coefficient..Soft-start controller is gentle on loads..Method offers fail-safe
variable-reluctance sensors..circuit forms adjustable bipolar clamp..Analog switch expands I2C interface..circuit safely applies power to ICs..Simple circuit forms peak/clipping indicator...
eng raafat tannir
Other Design :: 05-27-2007 17:00 :: marcony :: Replies: 0 :: Views: 886
need to run a simulation for a circuit that contains the optocoupler 6n136
can any one help... thx
Analog Circuit Design :: 10-18-2007 09:55 :: ho83 :: Replies: 0 :: Views: 824
Are you trying to drive the FETs directly with the optocoupler, or are the optocouplers driving other gate drive ICs? You should post the actual gate drive schematic.
Insufficient current in the isolators can cause several problems. Of most concern is the possibility that the turn off time of each FET will be increased greatly, leading to cross
Power Electronics :: 05-02-2012 08:16 :: mtwieg :: Replies: 13 :: Views: 1479
I'm designing a circuit with optocoupler 4N25 and 24v dc input which output is connected to the microcontroller
Please calculate the resistance
Electronic Elementary Questions :: 09-19-2012 11:49 :: masoud1234 :: Replies: 6 :: Views: 2123
I am looking for a very high isolation between two microwave circuits(4GHz)(isolation > 50dB).
Is it possible to use a optocoupler between these two circuits?
What should be the specs and type of optocoupler, i should use?
Kindly help by sending some details on such a application.
RF, Microwave, Antennas and Optics :: 10-11-2012 11:59 :: afz23 :: Replies: 6 :: Views: 429
How to identify resistor and capacitor values in optocoupler feedback circuit?
componet involved:optocoupler,AS431,resistors and capacitors..Please help..
Analog IC Design and Layout :: 11-02-2012 11:59 :: Neophyte18 :: Replies: 0 :: Views: 268
is it possible to give 230v ac input directly to any optocoupler
Hobby Circuits and Small Projects Problems :: 12-08-2012 07:48 :: nikhilt007 :: Replies: 5 :: Views: 1300
I am successfully using the attached ECG circuit to get ECG signal.
The problem is that this circuit needs two separate 9V DC batteries - one for the amplifier circuit & other for the isolation circuit (which has an optocoupler).
This safety feature is great when one is physically (...)
Analog Circuit Design :: 08-17-2013 07:33 :: vhha :: Replies: 3 :: Views: 395
Dear Members, I am designing 2 KVa pure sine wave inverter system , using SG3525 to step up 24 Dc to 320 Dc , and then using IR2110 to make pure sine wave by SPWM signals from pic16f684 . I have a question that should I Use any optocoupler (like tlp250) between Microcontroller and Driving circuit or should I give signal directly to IR2110. (plz su
Hobby Circuits and Small Projects Problems :: 10-10-2013 08:31 :: pakkiboy :: Replies: 16 :: Views: 1023
for electrical isolation between two different voltages
optocouplers are used
famous optocouplers are MCT2E, 4N35
Analog Circuit Design :: 03-11-2005 12:29 :: email@example.com :: Replies: 6 :: Views: 1235
You can use a relay, but if you would like to experiment a little bit and costruct a small contact-less circuit, take a look at the the circuit below ..
More info on MOC3010 optocoupler can be found here:
Electronic Elementary Questions :: 09-06-2005 00:09 :: IanP :: Replies: 5 :: Views: 1546
I have done a light dimmer cum fan regulator circuit using PIC.
regulation by varying firing angle.
Using optocoupler MOC3021 to drive the triac BT136.
It is working ok,But the triac becomes leeky frequently. triac starts conducting slightly without any drive the load wont be completly cut
Microcontrollers :: 10-21-2005 04:39 :: UroBoros :: Replies: 17 :: Views: 14459
I guess you want to switch on/off battery power what means that the switch will be located between a battery and a load ..
In this case you may consider an optocoupler and P-channel mosfet ..
See attached file for an example of a P-MOS switch ..
Analog Circuit Design :: 11-09-2005 20:00 :: IanP :: Replies: 4 :: Views: 1002
555 has source/sink current of up to 200mA so you should be able to drive your motor directly from its output (pin3) ..
Option1: you can use 555 in monostabile configuration (see picture below) and adjust time in such a way that the motor does only 1 turn .. Other option will require some sort of shaft encoder build around optocoupler or a switch
Electronic Elementary Questions :: 11-11-2005 22:14 :: IanP :: Replies: 2 :: Views: 832
Try to differentiate between signals comming from highly hazardous sections (ignition, for example) and those comming from low-voltage sensors ..
In the former option good protection and signal conditioning can be provided by resistor-zener diode-optocoupler combination ( see example at: ), i
Analog Circuit Design :: 02-14-2006 20:48 :: IanP :: Replies: 1 :: Views: 2188
I have a computer device that sends a 3.3v dc signal when the computer is actively recording audio. I want to connect this device to a record light circuit that uses a solid state relay that (when activated) sends 120V ac to our On-Air lights.
even thought the solid state relay claims a 3-24V input trigger range I have had problems with any sign
Electronic Elementary Questions :: 03-08-2006 12:42 :: Brain Damage :: Replies: 6 :: Views: 16786
Since you only seem to need the pulse rate rather than amplitude, why not a high speed optocoupler with shmitt logic o/p. You may need a transistor pre amp to get the voltage swing a bit higher to overcome the VD of the opto led.
Hobby Circuits and Small Projects Problems :: 06-02-2006 12:02 :: GrandAlf :: Replies: 9 :: Views: 1563
HI TO ALL
I AM MAKING A PROJECT USING S202S11
IT IS A Solid State Relays Built-in snubber circuit
Non-Zero Cross type.
BUT I AM UNABLE TO FIND IT LOCAL MARKET
SO COULD U PLEAS THE EQUVALENT CIRCUT FOR IT SINCE I THINK IT CAN POSSIBLE BY USING A optocoupler(MOC3011) AND A TRIAC
Hobby Circuits and Small Projects Problems :: 06-19-2006 07:47 :: riteshjain_82 :: Replies: 0 :: Views: 828
Galvanic - we have power transference between two circuits without the same reference point/ground.
There is Blocking of DC with a infinite series capacitor like in the previous options, but isn't Galvanic.
Other Design :: 07-13-2006 15:06 :: teteamigo :: Replies: 2 :: Views: 1205
can someone tell me how to measure an optocoupler with my DMM to see if its good or bad. i have an optocoupler with 4 pins # l0514the nomber below 817b.
thanks for assistance
Electronic Elementary Questions :: 12-10-2006 19:11 :: rascabuche :: Replies: 1 :: Views: 5746
hi i am using the optocoupler as shown in attachment .The voltage across transister is not same as the voltage applied across diode ? In what way this device provides isolation and still carry information from one side to the other.
Any response in this regard would be helpful.
Analog Circuit Design :: 12-11-2006 07:28 :: wajahat :: Replies: 2 :: Views: 957
The question is about pin-6 of optocoupler that's the base of output transistor.
I'm studing a design in wich the base is not connected; I can't simulate it in Spice because I have an error in the netlist like "pin 6 is unconnected".
So, who can help me to understand why is it possible to connect out of the chip the base of transinstor; is not su
Analog Circuit Design :: 01-05-2007 09:53 :: BGA :: Replies: 1 :: Views: 2635
I made this circuit to be a light dimmer but it did not work. I use BT136 for the SCR and MOC3022 for optocoupler.
Can you tell me what is the problem? may be I should use another SCR.
I have tested this circuit with BT136. It worked.
Most probably you must have interchanged MT1 and MT2 terminals of triac and tha
Robotics and Automatics Forum :: 02-17-2007 14:34 :: CMOS :: Replies: 8 :: Views: 1972
If the optocouples is rated for 6kV, it will provide 6kV isolation barrier that you want in the feedback path. Your schematic shows the part number PI-3796-121903, but I couldn't find the datasheet for the optocoupler with Google.
Analog Circuit Design :: 03-22-2007 23:56 :: kender :: Replies: 4 :: Views: 1061
Wat is the main use of optocoupler when we give feedback in SMPS , is it just to provide isolation or else.
How does the opto circuit operate withj tiny switch IC, and how the resistance value calculated
Analog Circuit Design :: 03-29-2007 03:32 :: saurav_sdpl :: Replies: 4 :: Views: 2609
Use off-the-shelf solid-state relays (incorporate zero-crossing detector, optocoupler and triac) which can be controlled directly from microcontroller pins, or use discrete components such as optocouplers (MOC-series, for instance) and triacs to build one .. see picture below ..
Professional Hardware and Electronics Design :: 03-29-2007 23:38 :: IanP :: Replies: 2 :: Views: 1949
You can use 1:1 transformer or any other ratio if you need.
also you can use an optocoupler in linear mode not in saturation mode
check this link
Analog Circuit Design :: 06-04-2007 04:52 :: alzomor :: Replies: 3 :: Views: 526
i want to use a optocoupler(MOC3021) in the output of flyback converter but i am first in it and i dont know how set it(i want a optocoupler to sense output voltage and reffer it to control circuit,i think this type of optocoupler is not useful),please help me
Analog Circuit Design :: 07-12-2007 13:12 :: ashein :: Replies: 2 :: Views: 842
PLEASE restate your question.... MOC3021 is a triac based optocoupler and contains a triac in itself and i dont understand what you mean when you say that you want to trigger BTA12 using MOC3021... please post your circuit....
Analog Circuit Design :: 09-08-2007 02:37 :: A.Anand Srinivasan :: Replies: 5 :: Views: 5996
I need to design a circuit to read ,measure the 220 V mains voltage.
I saw one design note where the author was using one 150 V zener plus one resistor to limit current to the optocoupler .Mains voltage was measured by measuring the period the output from the optocoupler was low during the positive semi-period . He also had a diode (...)
Analog Circuit Design :: 09-09-2007 13:57 :: leonardo0 :: Replies: 2 :: Views: 2796
i have a unipolar 2 phase step motor and i have a circuit diagram which designed
with uln 2003. but i need to redesign this circuit by using optocoupler. how can i
Robotics and Automatics Forum :: 02-22-2008 09:26 :: adnan_merter :: Replies: 6 :: Views: 8441
An optocoupler followed by a schmitt trigger should be fine. You need to choose your resistor on the LED side according to the current rating for the optocoupler. Being an ac source you should also put a diode in reverse across the LED to protect it from reverse voltage. There are other ways to do it but it is not worth compromising safety to save
Analog Circuit Design :: 03-17-2008 07:40 :: davidgrm :: Replies: 1 :: Views: 901
I have a optocoupler input with a resistor and reverse voltage protection diode.
See basic circuit attached.
The opto is a ACPL-217-500E device from Avago and is rated for 3000Vrms isolation and 10kV/us (CMR).
My questions are as follows:
1: How does the CMR rating actually relate to ESD? (ESD tests are ns while CMR is us)
2: The produ
Professional Hardware and Electronics Design :: 09-05-2008 17:49 :: quinn :: Replies: 2 :: Views: 3189
Could somebody explain to me the function of optocoupler? When to use optocoupler? and the sample schematic diagram on how it is being used?
Microcontrollers :: 09-14-2008 22:58 :: kimtrox :: Replies: 8 :: Views: 3534
I want to isolate my parallel port from my step motor driver by optocoupler.
the input stage on my step motor driver is 74HC14N chip.
which one is best ? (the optocoupler on circuit is a sample,not the one my going to use)
and I hope you can give me some explaination about it. thanks
Hobby Circuits and Small Projects Problems :: 10-05-2008 09:38 :: xinz :: Replies: 4 :: Views: 2167
what is meant by the term optocoupler??
Microcontrollers :: 06-11-2009 02:43 :: puneetnepsam :: Replies: 3 :: Views: 2393
Use the below circuit to clean the made some modifications to the circuit. At the collector of the transistor I hooked up an LED with 1K series. The circuit wasn't working at all, the LED wasn't bliniking. Then i removed the 0.1uF capaci
Microcontrollers :: 06-16-2009 09:08 :: Faizan Jawaid :: Replies: 18 :: Views: 7755
I am using FOD817 optocoupler in my design. As per the data sheet, the current transfer ratio of FOD817A is 80-160. My query is how to measure the CTR and how to fix the CTR.
V. Naresh Kumar
Advay Solutions Pvt. Ltd
Analog Circuit Design :: 06-19-2009 06:13 :: nareshgtr :: Replies: 2 :: Views: 8407
hi,,how do i connect properly the optocoupler with IRF350 mosfets that would control an 8Amps, 220v Ac Motor??
my problem is i dont know how to properly connect the optocoupler to the gate of the IRF350 mosfet..
pls post any schematics that would help me...
thanks n advance...
Microcontrollers :: 07-23-2009 00:39 :: romel_emperado :: Replies: 3 :: Views: 2011
Well the circuit using the TRIAC the potenciometer only adjust the RC time for the gate of the TRIAC.
So, you could control with a uC the time of the gate of the TRIAC and then you have a "digital potencimeter" in you dimmer. You should use an optocoupler for isolating the uC from the AC dangerous voltage.
Electronic Elementary Questions :: 09-07-2009 11:13 :: xvibe :: Replies: 7 :: Views: 3669
GATE pin of MOSFET is connected to Ground via optocoupler it is not getting any voltages, optocoupler is used in a wrong way..
connect optocoupler PIN 4 to Gate & PIN 5 to +24v.
Electronic Elementary Questions :: 11-05-2009 09:32 :: hameeds01 :: Replies: 7 :: Views: 1080
You should analyze the circuit rather than searching the forum. No current will flow through the optocoupler in the presented circuit.
Power Electronics :: 12-10-2009 16:44 :: FvM :: Replies: 4 :: Views: 2756
If you need to isolate microcontroller from the car’s ground then an optocoupler is the answer, otherwise you can just use a resistor with a Zener diode .. see this url:
Digital Signal Processing :: 12-23-2009 23:03 :: IanP :: Replies: 6 :: Views: 5551