11 Threads found on edaboard.com: Photo Coupler
In photo coupler Whether I/O Capacitance and Capacitance coupling are same? Can any one clarify me??
Professional Hardware and Electronics Design :: 05-20-2014 03:19 :: Sindhuveee :: Replies: 0 :: Views: 510
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 (...)
Analog Circuit Design :: 07-30-2013 07:21 :: myatham :: Replies: 1 :: Views: 437
The coupler looks like
In the catalog photo, one port is terminated with 50 ohms, the other with a N connector.
RF, Microwave, Antennas and Optics :: 07-02-2013 14:27 :: FvM :: Replies: 4 :: Views: 1197
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
Power Electronics :: 03-31-2013 14:29 :: FvM :: Replies: 12 :: Views: 1436
I have 3 of these I am wondering if they are bad.
On one side
reads same regardless of polarity
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.
will PC 817 versus EL 817 work the same?
Elementary Electronic Questions :: 11-05-2012 12:08 :: sdowney717 :: Replies: 0 :: Views: 400
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.
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 :: 06-02-2012 06:09 :: TripACT :: Replies: 8 :: Views: 1335
Differences between opto-couplers, photo-couplers & photodarlington opto-couplers ?
Advantages & Disadvantages of these ?
Power Electronics :: 09-14-2011 07:32 :: dineshdeshmuk :: Replies: 3 :: Views: 1620
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 :: 09-03-2011 09:23 :: FvM :: Replies: 1 :: Views: 1668
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 :: 04-08-2009 08:14 :: srinu9009 :: Replies: 5 :: Views: 1952
check this one may be helpful
Analog Circuit Design :: 12-19-2006 11:49 :: artem :: Replies: 12 :: Views: 3298
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 :: 09-29-2005 21:19 :: id_guy :: Replies: 2 :: Views: 1039