An Optocoupler, is an electronic components that interconnects two separate electrical circuits by means of a light sensitive optical interface. We know from our . 3. Signal transmission between circuits of different po- tentials and impedances. □ Applications. DIP 4pin General Purpose. Photocoupler. 1. 4pin DIP package. The purpose of an optocoupler is to transfer signals from one circuit to another yet keep them galvanically isolated. Here I want . Thanks for clearity on ic

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Thank you for the information.

Mihai on July 15, at 8: Any help would be apreciated. I was referring to the junction resistance. Learn how your comment data is processed.

Blumen on October 26, at 7: Mihai on February 2, at 5: Please correct the pin numbers in image. Mihai on August 27, at With no voltage applied to the LED pins 1 and 2and with an open oltocoupler pin 6there should be a high resistance between pins 5 and 4.

measuring a optocoupler

Mihai on July 19, at 3: Mihai on September 17, at The purpose of an optocoupler is to transfer signals from one circuit to another yet keep them galvanically isolated. Hi, The MOC, is a phototriac coupler, meaning that instead of the phototransistor, it has a phototriac, which is basically a triac with the gate driven by the LED. Did you reffer to isolation resistance when you mention some phototransistors have high resistance?

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Geert Van Droogenbroeck on November 18, at I was wondering if i could just bypass the optcoupler and see if it works. Shahid on August 7, at 1: I appriciate… I tried that emprical method for H11B1 optocoupler.

First of all thanks for sharing such an useful information. I have two circuits.

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It depends on the 2nd circuit you are supplying the voltage on collector of the optocoupler, optocoupler will never transfer the voltages of circuit1 to circuit2, it decreases resistance between your supplied voltages at collector and emitter on the input of circuit2. Wade on February 5, at 9: For response time or frequency response data, check the datasheet. I like the way you explain things. Mihai on March 6, at 2: Viliam on September 7, at 1: Sunil on March 3, at 3: If the LED is good then optocopler should check 187b phototransistor, you could measure it with the ohmmeter just like the LED between pins 3 and 4 the emitter and collector 81b7, and you should get a high resistance value both ways if the phototransistor is good.

Some features may not work properly. If i give the input of V DC what will be the response of this optocouplerr. You have JavaScript disabled or are viewing the site on a device that does no support JavaScript. Mihai on March 18, at Your email address will not be published. I guess, it should work mostly the same as a normal triac.


Sanu sebastian on August 19, at Better check the datasheet for a test circuit. Nupra on March 18, at 6: In my example an ohmmeter is connected at the output, in order to see the change in resistance.

Good design is as little design as possible. Sarfaraz on November 8, at 9: An optocoupler or optoisolatoris a device that contains a light-emitting diode Optocoupoer and a photosensor photodetector, such as a photoresistor, a photodiode, a phototransistor, …etc.

Hi, First of all thanks for sharing such an useful information. Evis on November 12, at 7: Ado on November 14, at The LED is basically a diode, and it should not conduct both ways not get values on the meter both ways. These information are very good indeed. Thanks for the easy to follow explanation of how to rest an optocoupler.

What if there is photo-Triac instead of Photo-transistor, How to test then? Mihai on February 6, at