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Help required with unknown device

by bigshow1977
Tags: device, required, unknown
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bigshow1977
#1
Feb21-12, 09:04 AM
P: 1
Hi

I'm having problems identifying a component on a PCB and i was wondering if anyone here could shed some light on what this device is...


http://db.tt/i1V3uqZf

Anyhelp is appreciated

Rgds


Phil
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jedishrfu
#2
Feb21-12, 09:33 AM
P: 2,985
my guess is its a crystal and the labeling of fcc13 fcc14 ... kind of indicates that
jedishrfu
#3
Feb21-12, 09:36 AM
P: 2,985
if you know what the board is you might be able to get a schematic online or a user guide.

berkeman
#4
Feb21-12, 12:11 PM
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berkeman's Avatar
P: 41,083
Help required with unknown device

Quote Quote by bigshow1977 View Post
Hi

I'm having problems identifying a component on a PCB and i was wondering if anyone here could shed some light on what this device is...


http://db.tt/i1V3uqZf

Anyhelp is appreciated

Rgds


Phil
Quote Quote by jedishrfu View Post
my guess is its a crystal and the labeling of fcc13 fcc14 ... kind of indicates that
I think you are right about it being a frequency source, but my guess would be a programmable oscillator. Especially since they all have the same overall marking, the difference would be in how they are programmed.

This is a similar part:

http://search.digikey.com/scripts/Dk...rds=AP3S3EJ-ND

When ordering it from Digikey, you tell them what frequency you want them programmed to. I recently ordered some at 38.4000MHz, and the other was 39.3216MHz.
jedishrfu
#5
Feb21-12, 12:39 PM
P: 2,985
Quote Quote by berkeman View Post
I think you are right about it being a frequency source, but my guess would be a programmable oscillator. Especially since they all have the same overall marking, the difference would be in how they are programmed.

This is a similar part:

http://search.digikey.com/scripts/Dk...rds=AP3S3EJ-ND

When ordering it from Digikey, you tell them what frequency you want them programmed to. I recently ordered some at 38.4000MHz, and the other was 39.3216MHz.
I think you nailed it. the device looks remarkably similar to the OP's picture.
vk6kro
#6
Feb21-12, 06:15 PM
Sci Advisor
P: 4,032
You could narrow the search a bit by measuring the resistance from each output pin to the other pins on one of these devices.

Draw up a diagram of the resistances, if any, that you find.

Also note how each of those things are connected to each other via the printed circuit board. Do the power supply lines seem to go through all of them?

The FCC bit makes it sound like an interference filter. FCC is the American Govt agency that deals with radio interference, among other things.
likephysics
#7
Feb23-12, 11:53 AM
P: 617
Quote Quote by bigshow1977 View Post
Hi

I'm having problems identifying a component on a PCB and i was wondering if anyone here could shed some light on what this device is...


http://db.tt/i1V3uqZf

Anyhelp is appreciated

Rgds


Phil
Looks like a common mode choke or transformer.

Take a multimeter and test for continuity between the pins. If it beeps between any 2 pins it's either a transformer or choke.


@Berkemen, are you sure it's a Surface mount crystal?
The part in the ckt, looks more like a plastic box than a SMD component.
berkeman
#8
Feb23-12, 12:10 PM
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berkeman's Avatar
P: 41,083
Quote Quote by likephysics View Post
@Berkemen, are you sure it's a Surface mount crystal?
The part in the ckt, looks more like a plastic box than a SMD component.
Yeah, looks like an SMT part to me from that view. Kind of similar to an SO-8 package, but with only 4 leads. I could be wrong, of course.


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