Author Topic: Need help ID'ing crystal/osc  (Read 382 times)

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Offline AE7OO

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Need help ID'ing crystal/osc
« on: August 22, 2019, 10:42:13 pm »
Greetings,

I guess my GoogleFU is just not up to snuff today(I also tried Bing). 
After pounding my head on the ol'brick wall |O I decided to come and check to see if maybe someone here has seen them before.

These 3 smd crystals/osc came off an OLD Cisco serial card.
I'm hoping someone can at least ID the manufacturer; Even better would be a link to datasheets.   >:D

Thanks,
GB
 

Online coromonadalix

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Re: Need help ID'ing crystal/osc
« Reply #1 on: August 22, 2019, 10:57:13 pm »
From : MF ELECTRONICS CORP


series   but not he same casing ??
m1000
m1200
m1280

cant find anything much about them              Lots of dead ends
« Last Edit: August 22, 2019, 11:00:27 pm by coromonadalix »
 
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Offline fzabkar

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Re: Need help ID'ing crystal/osc
« Reply #2 on: August 22, 2019, 11:10:56 pm »
Are these oscillators (4-pin) or crystals (2-pin)?

What are the date codes on the other chips in the device?

The Wayback Machine may have your datasheets:

http://web.archive.org/web/*/http://mfelec.com

FWIW, this datasheet helps to make sense of the part markings:

http://web.archive.org/web/20040426230206/http://mfelec.com/PDFs/G.pdf

These are all the PDFs from that domain:

http://web.archive.org/web/*/http://www.mfelec.com/PDFs/*

Another example:

http://web.archive.org/web/20030605181018/http://www.mfelec.com:80/PDFs/EC.pdf
« Last Edit: August 22, 2019, 11:29:03 pm by fzabkar »
 
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Offline AE7OO

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Re: Need help ID'ing crystal/osc
« Reply #3 on: August 23, 2019, 12:02:04 am »
Hi,

All of these have 4 contacts on the bottom.

Thank you all.  I'm going to whip up a quick pcb and see what happens.
 

Offline Scorpio9gm

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Re: Need help ID'ing crystal/osc
« Reply #4 on: August 23, 2019, 04:35:25 am »
Quote
guess my GoogleFU is just not up to snuff today(I also tried Bing).

It's not your GoogleFU that is to blame. Google is no longer a search engine it is an AI brainwashing and manipulation platform and nothing more. Just a few years ago you could find anything you wanted and now it is almost worthless.
 

Offline AE7OO

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Re: Need help ID'ing crystal/osc
« Reply #5 on: August 23, 2019, 05:12:27 am »
I wonder what happened to MF Electronics.  Never mind, it looks like they went under sometime before 2003 when Valpey-Fisher Corp. bought out their assets, or at least some of them.

I've got a basic test PCB done that I'll etch here in about 30 mins.  I'm going to solder the 1.544 unit and see what happens.  The 25M unit is the one I want to use, plus to measure it, I would have to get out my old analog scope(Which is 60Mhz) because the best digital one I have is 25Mhz...:)

These units have the "Ceramic with hermetic resistance-welded metal lid" case that 2 of those datasheets talk about.  So at least that much is true.

I'll be back in the next hour to tell you if the pin-outs worked...  :D
« Last Edit: August 23, 2019, 05:14:50 am by AE7OO »
 

Offline fzabkar

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Re: Need help ID'ing crystal/osc
« Reply #6 on: August 23, 2019, 05:38:24 am »
 
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Offline AE7OO

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Re: Need help ID'ing crystal/osc
« Reply #7 on: August 23, 2019, 10:32:12 am »
Sorry about the delay, I got sidetracked.... >:D

It looks like these are crystals, not oscillators.

Not a big deal, I'll just have to make another board that includes the exciter...  8)

I've included an image of the board, after etching(I use the cold transfer method) and after loading, sorry about the mess.
On the left is where the crystal goes, then to the right the output, and then to the far right is the test point with a 100 ohm resistor inline so the probe would not affect the output.

Sorry for the duplicate...
 

Offline AE7OO

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Re: Need help ID'ing crystal/osc
« Reply #8 on: August 23, 2019, 10:53:48 am »
Whoops!  I spoke too soon...

Earlier I was feeding it 3.3V, and just now I decided to give it 5V in a what the hell lets try it moment.

And it works.  My Owon VDS1022 is showing 1.546Mhz, which is close enough for me, the .002Mhz difference could be the scope, age, or who knows what....

The funky wave is most likely from me being lazy, I'm using the ground lead.

Thanks to everyone who helped me out!
« Last Edit: August 23, 2019, 10:58:02 am by AE7OO »
 


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