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'[PIC]: Oscillator not working at indicated frequen'
2001\02\07@014705 by Jacob M Hartman

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I believe that it is indeed a parallel cut crystal.  It's an Epson CA-301,
just like the 16F877 guide calls for, with a 15 pF cap to ground on either
side of it.  Incidentally, I just noticed that its labeling reads
"184AP9X".  Maybe that indicates that the crystal is in fact 18.4 MHz?
(Anyone know how these things are labeled?)

Jake

P.S.  Thanks, David, for the pointer to your website.  I certainly learned
a few things!

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2001\02\07@015740 by Bob Ammerman

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----- Original Message -----
From: Jacob M Hartman <spam_OUTjmhartmaTakeThisOuTspamUS.IBM.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, February 07, 2001 1:47 AM
Subject: Re: [PIC]: Oscillator not working at indicated frequency


> I believe that it is indeed a parallel cut crystal.  It's an Epson CA-301,
> just like the 16F877 guide calls for, with a 15 pF cap to ground on either
> side of it.  Incidentally, I just noticed that its labeling reads
> "184AP9X".  Maybe that indicates that the crystal is in fact 18.4 MHz?
> (Anyone know how these things are labeled?)
>
> Jake

Yep, DIGIKEY got ya!

They got me about a year ago in a very similar way:

I ordered some 10MHz XTALs for an 18C.

One unit was way off in frequency, turned out the XTAL was an 11.058MHz
(IIRC).

Good grief!

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\02\07@103616 by David VanHorn

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At 01:47 AM 2/7/01 -0500, you wrote:
>I believe that it is indeed a parallel cut crystal.  It's an Epson CA-301,
>just like the 16F877 guide calls for, with a 15 pF cap to ground on either
>side of it.

With a 15pF cap on either side, you're looking at about 10pF load.
A bit light generally, but not enough to cause that much drift!


>  Incidentally, I just noticed that its labeling reads
>"184AP9X".  Maybe that indicates that the crystal is in fact 18.4 MHz?
>(Anyone know how these things are labeled?)

Sounds suspicious. Call Digikey, and ask for a tech.
The one time they sent me a wrong part, they fedexed the replacement overnight.


>Jake
>
>P.S.  Thanks, David, for the pointer to your website.  I certainly learned
>a few things!


:)


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2001\02\07@111714 by Dan Michaels

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>
>> I believe that it is indeed a parallel cut crystal.  It's an Epson CA-301,
>> just like the 16F877 guide calls for, with a 15 pF cap to ground on either
>> side of it.  Incidentally, I just noticed that its labeling reads
>> "184AP9X".  Maybe that indicates that the crystal is in fact 18.4 MHz?
>> (Anyone know how these things are labeled?)
>>
>> Jake
>
>Yep, DIGIKEY got ya!
>
>They got me about a year ago in a very similar way:
>

Jacob,

On every xtal I have [about 20 different frequencies], the labelling
matches the freq in an "obvious" way.

And don't let Bob steer you wrong on D-K [probably not his intent].
I order from them all the time, and have had few problems.

However, last week I did get a salesperson [man] who was apparently
very new, and screwed my order up in 3-4 places. In your case, simple
difference between entering P/N SE3438 and SE3436. Just imagine
having a job where you have to enter 20,000 of those friggin P/Ns
every day --> decreasing IQ and brain fog and "terminal" stupidity.

BTW, I have used 3 or 4 different 20mhz parallel-cut xtals from
D-K - although not the cylindrical-type - with several different
PICs, and never had a problem.

best regards,
- dan michaels
=================

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2001\02\07@122911 by Olin Lathrop

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> However, last week I did get a salesperson [man] who was apparently
> very new, and screwed my order up in 3-4 places. In your case, simple
> difference between entering P/N SE3438 and SE3436. Just imagine
> having a job where you have to enter 20,000 of those friggin P/Ns
> every day --> decreasing IQ and brain fog and "terminal" stupidity.

That's why I always order on line.  I haven't had them screw up an on line
order yet.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olinspamKILLspamembedinc.com, http://www.embedinc.com

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2001\02\07@152534 by Bob Ammerman

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----- Original Message -----
From: Dan Michaels <.....oricomKILLspamspam.....USWEST.NET>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Wednesday, February 07, 2001 11:17 AM
Subject: Re: [PIC]: Oscillator not working at indicated frequency


> >
> >> I believe that it is indeed a parallel cut crystal.  It's an Epson
CA-301,
> >> just like the 16F877 guide calls for, with a 15 pF cap to ground on
either
{Quote hidden}

Indeed, I think Digikey is terrific.

> However, last week I did get a salesperson [man] who was apparently
> very new, and screwed my order up in 3-4 places. In your case, simple
> difference between entering P/N SE3438 and SE3436. Just imagine
> having a job where you have to enter 20,000 of those friggin P/Ns
> every day --> decreasing IQ and brain fog and "terminal" stupidity.

I use the web ordering capability, and I don't get it wrong (or at least I
haven't yet).

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\02\08@132209 by Jacob M Hartman

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Yep, I bet you're all right:  Digikey probably got me.

The funny thing is, though, that I did order online.  And the invoice
indicates a 20.000 MHz crystal, as does the printed label on the
static-proof baggie in which the crystal came.  Must have been a stocking
error.

Not that I'm complaining; I've ordered plenty of times from Digikey, and
this is the first glitch.  I'll deal with the 18.4 MHz crystal, I suppose,
since it works just fine....  No point in making them spend a few bucks to
ship such a tiny thing.  :-)

Thanks to all,
Jake

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2001\02\08@140815 by Bob Ammerman

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----- Original Message -----
From: Jacob M Hartman <jmhartmaspamspam_OUTUS.IBM.COM>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Thursday, February 08, 2001 1:22 PM
Subject: Re: [PIC]: Oscillator not working at indicated frequency


> Yep, I bet you're all right:  Digikey probably got me.
>
> The funny thing is, though, that I did order online.  And the invoice
> indicates a 20.000 MHz crystal, as does the printed label on the
> static-proof baggie in which the crystal came.  Must have been a stocking
> error.

Yeah, that's exactly what happened to me: order was right, invoice was
right, packing slip was right, baggie was right, product was wrong.

> Not that I'm complaining; I've ordered plenty of times from Digikey, and
> this is the first glitch.

Me either. DK has been quick, they always have what they say they have.

>I'll deal with the 18.4 MHz crystal, I suppose,
> since it works just fine....  No point in making them spend a few bucks to
> ship such a tiny thing.  :-)

I don't know -- I guess I'd like 'em to know where they goofed up so they
could fix it. If you do decide to do something about it let them know you
have a  'colleague' (me) that got a similar result.

Who knows: maybe the guy in charge of packaging crystals is on drugs or
something ;-)

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\02\08@141924 by Dan Michaels

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BobA wrote:
>Who knows: maybe the guy in charge of packaging crystals is on drugs or
>something ;-)
>


Actually, the only guys who will take those jobs are old geezers
with thick reading glasses, who can't tell a red band on a resistor
from a brown band. They faint and trip and knock over the packing bins
a lot too, scattering the goods. Plus they usually have trouble
reading the packing invoices to start with. Bound to mess up once
in a while.

Actually - think of what it would be like if they were as bad as
all of the programmers that Olin knows. Then you would only get
the correct xtal 1% of the time :):):):):):).

- danM
==========

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2001\02\10@012329 by Dave Bell

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Dan Michaels wrote:

>BobA wrote:
>>Who knows: maybe the guy in charge of packaging crystals is on drugs or
>>something ;-)

>Actually, the only guys who will take those jobs are old geezers
>with thick reading glasses, who can't tell a red band on a resistor
>from a brown band.

Hey!!  I couldn't tell a red band from a brown, LONG before I was an old
geezer! Luckily, I have kids to read my codes for me...

Dave

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2001\02\10@083521 by Bob Ammerman

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----- Original Message -----
From: Dave Bell <RemoveMEdbellTakeThisOuTspamTHEBELLS.NET>
To: <spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU>
Sent: Saturday, February 10, 2001 1:22 AM
Subject: Re: [PIC]: Oscillator not working at indicated frequency


{Quote hidden}

Huh, There are bands on resistors?!!?? ;-)

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\02\10@111122 by trm

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What ? Do you only buy the 1% ones with numbers ?

Ted

Bob Ammerman wrote:

{Quote hidden}

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2001\02\10@143532 by Dan Michaels

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Dave Bell wrote:

>
>>Actually, the only guys who will take those jobs are old geezers
>>with thick reading glasses, who can't tell a red band on a resistor
>>from a brown band.
>
>Hey!!  I couldn't tell a red band from a brown, LONG before I was an old
>geezer! Luckily, I have kids to read my codes for me...
>

Anyone as old as I am, and with my thin eyes and crusty humor,
should be able to catch my drift -[unfortunately].

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2001\02\10@145411 by Dan Michaels

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At 11:11 AM 2/10/01 -0500, you wrote:
>What ? Do you only buy the 1% ones with numbers ?
>

>> Huh, There are bands on resistors?!!?? ;-)
>>

This is why some of us have DMMs.

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2001\02\11@042343 by Jinx

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>>Dan Michaels wrote:
>>Who knows: maybe the guy in charge of packaging crystals is on
>>drugs or something ;-)
> >
> >Actually, the only guys who will take those jobs are old geezers
> >with thick reading glasses, who can't tell a red band on a resistor
> >from a brown band.
> >
> > Hey!!  I couldn't tell a red band from a brown, LONG before I
> >was an old geezer! Luckily, I have kids to read my codes for
> >me...
>
> Huh, There are bands on resistors?!!?? ;-)
>
> Bob Ammerman

Bands on drugs too

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