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Author Topic: Optical Isolation  (Read 1638 times)
Yampa Bob

Y.V.R.R.


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« on: June 06, 2009, 09:44:20 PM »

I define it as hiding from my wife at chore time, "Out of sight, out of mind". Cheesy

I ran across these pages during my daily surfing, for those "inquisitive minds want to know" type members. The information is self-explanatory, so in the words of Oliver Goldsmith: "Ask me no questions, and I'll tell you no lies".

Just think of it as a "black box" that isolates inputs and outputs.

Here's the "nitty".  (all you really need to know)
http://en.wikipedia.org/wiki/Opto-isolator

Here's the "gritty".  (gets down and dirty)
http://www.bb-elec.com/tech_articles/optical_isolation_illustration.asp

Here's the "band"...one of my favorites. (in case you have no interest in the above)
http://en.wikipedia.org/wiki/Nitty_Gritty_Dirt_Band

Of course it's train related, when you consider the frustration you sometimes feel working on a locomotive or installing decoders, and nothing seems to work. "If you want to see a rainbow, you've got to stand a little rain".

Enjoy.... or not... Cheesy
« Last Edit: June 06, 2009, 10:17:39 PM by Yampa Bob » Logged

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Rule Number One: It's Our Railroad.  Rule Number Two: Refer to Rule Number One.
pdlethbridge
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« Reply #1 on: June 06, 2009, 10:42:55 PM »

Headache time Cry Cry Cry Cry Cry
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Jim Banner

Enjoying electric model railroading since 1950.


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« Reply #2 on: June 06, 2009, 10:45:21 PM »

Optical isolation - most of us use it every day.  Think of your TV remote control.  It can operate the electronics in your TV set.  Yet there is no wiring in between.  This is the isolation part.  Data is sent by a light beam.  This is the optical part.  There is no chance of getting a shock from your remote, even if your TV gets hit by lighting, thanks to optical isolation.

As an electronic component, an optical isolator is an LED plus a photo sensitive diode or transistor.  They are separated by air or clear epoxy and encased in black epoxy to keep outside lights sources at bay.  Typically, they can withstand thousands of volts before any electricity leaks from one end to the other.  They are used to keep one set of electronics electrically separated from another set of electronics.  In large scale electronics, they can be used to isolate decoder or radio receivers from sound cards, yet still allow them to operate the sound cards.  George Schreyer shows them on his website.

Jim
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Growing older is mandatory but growing up is optional.
Yampa Bob

Y.V.R.R.


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« Reply #3 on: June 06, 2009, 11:39:22 PM »

My wife has control of the TV remote. If I try to change channels, I get a "shock"...from her. 

Oh well, she likes NASCAR, Monster Jam,  Football and Western movies, so I can't complain.  Make that "don't dare" complain, I don't want to be optically isolated from the dinner table.  Cheesy
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I know what I wrote, I don't need a quote
Rule Number One: It's Our Railroad.  Rule Number Two: Refer to Rule Number One.
Terry Toenges


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« Reply #4 on: June 08, 2009, 11:29:46 AM »

Bob - It would be worse to be physically isolated from the dinner table Lips Sealed
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Feel like a Mogul.
Yampa Bob

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« Reply #5 on: June 08, 2009, 01:54:43 PM »

I don't care what my wife calls me, as long as she calls me for dinner.  Cheesy
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Rule Number One: It's Our Railroad.  Rule Number Two: Refer to Rule Number One.
jsmvmd

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« Reply #6 on: June 11, 2009, 03:59:21 PM »

Bob, Have you been chewing your toenails again?
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Yampa Bob

Y.V.R.R.


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« Reply #7 on: June 11, 2009, 06:43:38 PM »

No, PD is the one with "hoof in mouth" syndrome. Actually, he's been trying to learn how to dance the "Hokey Pokey" and caught his lip on a hangnail.

http://kids.niehs.nih.gov/lyrics/hokey.htm

(Read the lyrics)   Cheesy
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Rule Number One: It's Our Railroad.  Rule Number Two: Refer to Rule Number One.
jward


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« Reply #8 on: June 11, 2009, 09:07:23 PM »

what if the hokey pokey really IS what it's all about?
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Jeffery S Ward Sr
Pittsburgh, PA
pdlethbridge
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« Reply #9 on: June 11, 2009, 09:54:25 PM »

Bob trained his horse to do the hokey pokey. Great fun at weddings.
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grumpy

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« Reply #10 on: June 12, 2009, 01:12:11 AM »

Paul
That was a donkey.
Don
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