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'[EE:] Silly Question, what is CR'
2004\06\02@063923 by Matthew Brush

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Hello all.

I have a super easy question. I've been looking at a lot of scrap circuit boards kickin around here, and I always notice little parts (usually look like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What does CR stand for?  The only thing I can thing of is Comparator.  Is that right?

Thanks ahead of time.

MJ Brush

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2004\06\02@071943 by Peter van Hoof

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crystal?

Peter


----- Original Message -----
From: "Matthew Brush" <spam_OUTmatthewbrushTakeThisOuTspamYAHOO.CA>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, June 02, 2004 6:38 AM
Subject: [EE:] Silly Question, what is CR


Hello all.

I have a super easy question. I've been looking at a lot of scrap circuit
boards kickin around here, and I always notice little parts (usually look
like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What
does CR stand for?  The only thing I can thing of is Comparator.  Is that
right?

Thanks ahead of time.

MJ Brush

--
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ways.  See http://www.piclist.com/#archives for details.

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2004\06\02@071944 by Peter van Hoof

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must be a ceramic resonator

Peter

----- Original Message -----
From: "Matthew Brush" <matthewbrushspamKILLspamYAHOO.CA>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, June 02, 2004 6:38 AM
Subject: [EE:] Silly Question, what is CR


Hello all.

I have a super easy question. I've been looking at a lot of scrap circuit
boards kickin around here, and I always notice little parts (usually look
like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What
does CR stand for?  The only thing I can thing of is Comparator.  Is that
right?

Thanks ahead of time.

MJ Brush

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

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2004\06\02@072152 by Dave Dilatush

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MJ Brush wrote...

>I have a super easy question. I've been looking at a lot
>of scrap circuit boards kickin around here, and I always
>notice little parts (usually look like SMT transistors)
>which are silkscreen labelled CR1, CR2, etc...  What does
>CR stand for?  The only thing I can thing of is Comparator.
>Is that right?

Nope.

CR = "Crystal Rectifier," a term once used for diodes, but
largely unused since very late in the Jurassic Age.

Why it survives as a component designator abbreviation, I've
never been able to figure out.  I use "D" for diodes.

Dave D.

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2004\06\02@072813 by John J. McDonough
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----- Original Message -----
From: "Dave Dilatush" <EraseMEdavedilatushspam_OUTspamTakeThisOuTCOMCAST.NET>
Subject: Re: [EE:] Silly Question, what is CR


> CR = "Crystal Rectifier," a term once used for diodes, but
> largely unused since very late in the Jurassic Age.

I knew it was a diode, but I didn't know where the CR came from.  Thanks.

--McD

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2004\06\02@080133 by Eisermann, Phil [Ridg/CO]

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pic microcontroller discussion list wrote:
>> which are silkscreen labelled CR1, CR2, etc...  What does
>> CR stand for?
>
> CR = "Crystal Rectifier," a term once used for diodes, but
> largely unused since very late in the Jurassic Age.
>
> Why it survives as a component designator abbreviation, I've
> never been able to figure out.  I use "D" for diodes.
>

I've wondered about that too. My theory is that it is meant to
mean "current rectifier"

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2004\06\02@102404 by Matthew Brush

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"Crystal Rectifier" sounds about right :)  The specific ones I'm looking at
right now are in that little 3pin SMT package that a lot of transistors and
voltage regulators come in.  I also remember seeing them labelling what I
would've guessed were diodes, but assumed they weren't cuz they didn't say
'D5' or whatever.

Anyway, now I know and maybe it wasn't a silly question.  Thanks, Peace


MJ Brush

{Original Message removed}

2004\06\02@104857 by William Chops Westfield

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On Wednesday, Jun 2, 2004, at 03:38 US/Pacific, Matthew Brush wrote:

> I always notice little parts (usually look like SMT transistors) which
> are silkscreen labelled CR1, CR2, etc...  What does CR stand for?

Parts  labled CRn are usually rectifiers (ie diodes.)  For instance,
see here:
www.blueguitar.org/new/text/threads/from_mark/
Voltage%20Multipliers.pdf

I'm not sure what CR stands for.  Perhaps "Current Rectifier" to
indicate a component handling significant power (compared to a signal
diode)?

BillW

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2004\06\02@192724 by Dave Dilatush

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Phil Eisermann wrote...

>I've wondered about that too. My theory is that it is meant to
>mean "current rectifier"

No, it's "crystal rectifier"; just an ancient term for diode. See

http://www.hyperdictionary.com/dictionary/crystal+rectifier

and

http://www.tpub.com/content/neets/14179/css/14179_27.htm

AFAIK the term originated with the advent of germanium
point-contact diodes.

Dave D.

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2004\06\02@193802 by Bob Blick

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Cold Rectifier.

It has no filament, like other (vacuum tube) rectifiers.

Cheers,

Bob

> I have a super easy question. I've been looking at a lot of scrap circuit
> boards kickin around here, and I always notice little parts (usually look
> like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What
> does CR stand for?  The only thing I can thing of is Comparator.  Is that
> right?

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2004\06\02@221023 by Richard Graziano

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It must be on a very old schematic

----- Original Message -----
From: "Matthew Brush" <matthewbrushspamspam_OUTYAHOO.CA>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Wednesday, June 02, 2004 6:38 AM
Subject: [EE:] Silly Question, what is CR


Hello all.

I have a super easy question. I've been looking at a lot of scrap circuit
boards kickin around here, and I always notice little parts (usually look
like SMT transistors) which are silkscreen labelled CR1, CR2, etc...  What
does CR stand for?  The only thing I can thing of is Comparator.  Is that
right?

Thanks ahead of time.

MJ Brush

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

--
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