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11 Threads found on Photo Coupler
In photo coupler Whether I/O Capacitance and Capacitance coupling are same? Can any one clarify me??
Hello All, We are monitoring an AC voltage (200Vac) using a diode and resistor and photo LED of Opto-coupler in series. Here the Reverse break down voltage of diode is 700V, Resistor value is 200K ohm, Opto-coupler reverse break down voltage is 6V. How to analyze impact of negative voltage (i.e. reverse break down voltage)? Where the (...)
The coupler looks like In the catalog photo, one port is terminated with 50 ohms, the other with a N connector.
The dominant pole of an opto coupler is associated with the photo transistor, not the LED. (I'm not sure which side you mean with the unusual term "opto diode"). Usual TL431 circuits already achieve a current source characteristic a higher frequencies. A cascode stage can partly improve the frequency characteristic of a resistor loaded poto t
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?
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
Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ? Advantages & Disadvantages of these ? thanks
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 (...)
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 (...)
check this one may be helpful
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 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 (...)