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Optocoupler Circuit

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hello, 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
Hello everyone, 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...... Regards, Anjali
You could use linear opto coupler for this purpose.
Is this what you need? Learning to Use an optocoupler or Optoisolator. Or did you mean something like this:
I think the optocoupler cannot source the current required by the lamp. what type of lamp you are per the optocoupler datasheet, only it can source 10mA current. Try replacing the lamp with a LED to verify your current demand.
Hello all! 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 (...)
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?
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
need to run a simulation for a circuit that contains the optocoupler 6n136 can any one help... thx
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
I'm designing a circuit with optocoupler 4N25 and 24v dc input which output is connected to the microcontroller Please calculate the resistance R1=? R2=?
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. thanks
How to identify resistor and capacitor values in optocoupler feedback circuit? componet involved:optocoupler,AS431,resistors and capacitors..Please help..
is it possible to give 230v ac input directly to any optocoupler
Hi there, 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 (...)
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
hai for electrical isolation between two different voltages optocouplers are used famous optocouplers are MCT2E, 4N35
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: Regards, IanP
Hai 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
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 .. Regards, IanP
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
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
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
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.
Check the fairchild web page, in the section of power supplies, they have a optocouplers for that.
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 Ras
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. wajahat.
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
Hi all 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
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.
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 urgent
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 ..
Hi 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 Salam Hossam Alzomor
hi friends 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 best regards ashein
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....
Hi 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 (...)
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 do this? please help
Hi there, I would like to build a circuit for changing the mains voltage value to a lower 0-5 Vdc or pulse in order to connect it to micro and have info about the mains voltage value. The product will be class 2 which means that it must be isolated with maximum leckage current 0.5mA. I have buid some circuits using transformer, reset ics, mosfe
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
Hello everyone. Could somebody explain to me the function of optocoupler? When to use optocoupler? and the sample schematic diagram on how it is being used? Thanks.
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
yes the main scope os to isolate your circuit. also the optocoupler are more immune to noise.. :-)
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
hi guys, 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. Regards V. Naresh Kumar Advay Solutions Pvt. Ltd
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...
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.
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.
You should analyze the circuit rather than searching the forum. No current will flow through the optocoupler in the presented circuit.
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: Rgds, IanP

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