OT Fun: Sleuth who did this schematic...

S

Silvar Beitel

Guest
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)

--
Silvar Beitel
 
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)

bringing up soldering isn\'t a bad pick-up line depending on the lady no joke
 
On 09/03/20 23:27, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)

Not me, but cool, especially if the lady understands electronics...

Chri
 
On 9/4/2020 3:57 AM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)

Cute, but not mine. I\'m too old for one-night stands. :)
 
Silvar Beitel wrote:

https://micro.magnet.fsu.edu/creatures/pages/wedding.html

Best regards, Piotr
 
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ.  On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work?  Just a shot in the dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady no
joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?

--
Cheers
Clive
 
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ.  On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work?  Just a shot in the dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country.  I mean, who uses .22 rather than 220n?

It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Friday, September 4, 2020 at 12:25:54 AM UTC-4, Pimpom wrote:
On 9/4/2020 3:57 AM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)


Cute, but not mine. I\'m too old for one-night stands. :)

What, are you in the grave?

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209
 
On Thursday, September 3, 2020 at 8:05:32 PM UTC-4, Chris wrote:
On 09/03/20 23:27, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark..

(The place and host were great, BTW.)


Not me, but cool, especially if the lady understands electronics...

Chri

No. She\'s an artist and art professor at UoA. She converted her large garage into a studio and has artwork (not just hers) *everywhere*. This particular item was in the guest room bathroom, behind the door. Perhaps a subtle indication of what she thinks of engineers. :) :)

--
Silvar Beitel
 
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs

I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris
 
On 09/04/20 16:22, Silvar Beitel wrote:
On Thursday, September 3, 2020 at 8:05:32 PM UTC-4, Chris wrote:
On 09/03/20 23:27, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the dark.

(The place and host were great, BTW.)


Not me, but cool, especially if the lady understands electronics...

Chri

No. She\'s an artist and art professor at UoA. She converted her large garage into a studio and has artwork (not just hers) *everywhere*. This particular item was in the guest room bathroom, behind the door. Perhaps a subtle indication of what she thinks of engineers. :) :)

I guess the next question is, do circuit diagrams shout :). Whatever,
but still quite creative...

Chris
 
On 04/09/2020 16:27, Chris wrote:

<snip>
I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

I thought you guys used foot-pounds per square volt, not farads?

--
Cheers
Clive
 
On 9/4/2020 8:57 PM, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris
Teaching myself electronics with very limited resources,
practically all the (few) books I could lay my hands on (mostly
hopelessly outdated) in the early days were of American origin.
So I \"grew up\" with microfarads and picofarads only - often
written as mfd and mmf or µµF. Even kΩ was not common then. It
was Ω or MΩ.

When I first came across nF and fF in European literature, I was
initially quite lost. Now I use whichever style is shorter for a
given value.
 
On Friday, September 4, 2020 at 11:27:30 AM UTC-4, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Oh! I thought it was about ammunition.

--

Rick C.

+ Get 1,000 miles of free Supercharging
+ Tesla referral code - https://ts.la/richard11209
 
On 09/04/20 18:30, Pimpom wrote:
On 9/4/2020 8:57 PM, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Teaching myself electronics with very limited resources, practically all
the (few) books I could lay my hands on (mostly hopelessly outdated) in
the early days were of American origin. So I \"grew up\" with microfarads
and picofarads only - often written as mfd and mmf or µµF. Even kΩ was
not common then. It was Ω or MΩ.

When I first came across nF and fF in European literature, I was
initially quite lost. Now I use whichever style is shorter for a given
value.

Ditto, in my case, reading the print off my dad\'s early copy of the
arrl handbook. A mine of useful info back then including tube base
connections and exotic photo quality ads from the likes of National and
Jemes Millen.

Whenever I see nF, there\'s always a pause as I do the mental
translation to uF. Old habits die hard...;

Chris
 
On 9/4/2020 11:34 PM, Ricketty C wrote:
On Friday, September 4, 2020 at 11:27:30 AM UTC-4, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Oh! I thought it was about ammunition.
I\'m not a \"gun lover\" but I own a few guns and am a fair shot.
For a long time, I wondered why gun calibers come in such odd
numbers - .357, 5.56mm etc. Now, of course, you can find info on
just about anything on the internet.
 
On Friday, September 4, 2020 at 3:23:25 PM UTC-4, Pimpom wrote:
On 9/4/2020 11:34 PM, Ricketty C wrote:
On Friday, September 4, 2020 at 11:27:30 AM UTC-4, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ. On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work? Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country. I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Oh! I thought it was about ammunition.

I\'m not a \"gun lover\" but I own a few guns and am a fair shot.
For a long time, I wondered why gun calibers come in such odd
numbers - .357, 5.56mm etc. Now, of course, you can find info on
just about anything on the internet.

You can find info... If you want to know about gun calibers and the when and why, a friend of mine is a collector and researcher of military items including guns. He had to sell his guns to enter a retirement community, but still has all his books and knowledge.

My friend is largely blind as well and one day I was reading an article to him about the ammunition used by a sniper. Seems just the details of something seemingly as simple as ammunition is a highly complex function with many trade offs. The part I liked was when they provided an equation with a coefficient that could only be found by measurements, i.e. a fudge factor. lol In the end the only way to be sure of the result is to make it, fire it and measure it.

When I see .22, I figure someone is talking about ammunition. If they were talking about electronics and wanted to be clear, they would not use a naked decimal point, it would be 0.22 and have the units marked. No one can be so lazy as to just write .22 and expect others to understand for sure. Unless they were writing in pencil on wrinkled paper with food splatters. Then it would be perfectly clear.

--

Rick C.

-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209
 
On 9/4/2020 6:10 AM, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ.  On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work?  Just a shot in the dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country.  I mean, who uses .22 rather than 220n?

The author knows where to get TCA0372s...
 
On 2020-09-04 11:27, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ.  On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work?  Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country.  I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Being from the days of multiply-Xeroxed schematics, I never use leading
decimal points. Thus it would be 0.22, except that I do use nanofarads.
;) For a 2200 pF cap I write \'2n2\'.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On 2020-09-04 13:30, Pimpom wrote:
On 9/4/2020 8:57 PM, Chris wrote:
On 09/04/20 14:45, Phil Hobbs wrote:
On 2020-09-04 06:10, Clive Arthur wrote:
On 04/09/2020 00:55, bitrex wrote:
On 9/3/2020 6:27 PM, Silvar Beitel wrote:
Seeing Pimpom\'s, JL\'s, and others posts of hand-drawn schematics
recently makes me finally get around to dumping this question on you:

Last January, I stayed at a B&B in Tucson, AZ.  On the wall of the
bathroom was this bit of \"art\":

https://photos.app.goo.gl/K4XuxmhADMaVq7Uc9

Do any of you recognize it as being your work?  Just a shot in the
dark.

(The place and host were great, BTW.)


bringing up soldering isn\'t a bad pick-up line depending on the lady
no joke

Yeah, but telling here she\'s at best a class A-B, potentially unstable
and hard of hearing isn\'t cool.

If she were a class A she\'d be hot.

Obviously drawn by a very old bloke, or maybe someone from a backward
country.  I mean, who uses .22 rather than 220n?


It\'s not uncommon for schematics to have a note saying \"All capacitances
in microfarads unless noted.\"

Even Digikey doesn\'t seem to know about nanofarads.

And that amp better have a nice low offset voltage. ;)

Cheers

Phil Hobbs


I think nF is quite common in europe, but every experienced engineer
should know that the default is microfarads and what .22 means. It\'s
consistent with 10u and more succinct, .22, rather than 220nF,
3 chars instead of 5...

Chris

Teaching myself electronics with very limited resources, practically all
the (few) books I could lay my hands on (mostly hopelessly outdated) in
the early days were of American origin. So I \"grew up\" with microfarads
and picofarads only - often written as mfd and mmf or µµF. Even kΩ was
not common then. It was Ω or MΩ.

When I first came across nF and fF in European literature, I was
initially quite lost. Now I use whichever style is shorter for a given
value.

I still write kc and Mc for frequencies sometimes.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 

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