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'What is this device?'
2004\08\15@190251 by Rich

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Is it like a transistor can, some FETs have four leads.  Does it have a
registration tab on it? Can you trace where the leads go to in order to
determine if any go to +V or common or some device like a relay or a load
resistor etc.?  Try figuring out what it does and you will have a good clue
as to what it is.

{Original Message removed}

2004\08\15@190252 by Rich

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----- Original Message -----
From: "Steve Ruse" <spam_OUTsteveTakeThisOuTspamWOTELECTRONICS.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Sunday, August 15, 2004 12:31 PM
Subject: [EE]: What is this device?


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2004\08\15@190500 by Bob Ammerman

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Might be as small bridge rectifier. Is it anyway near the power supply
circuitry on the board? Are there and + / - or ~ marks on the silk-screen
near it?

Bob Ammerman
RAm Systems

{Original Message removed}

2004\08\15@194110 by Steve Ruse

flavicon
face
On the silkscreen it is labeled as "U1", indicating a semiconductor device.
It is pretty much identical to a transistor can, but the transistors are
labeled "Q*".  There are no other marks on the board around this device. I
can't get any pictures of it right now. Supply to the board is DC, so it
wouldn't be a power rectifier. I'm in the process of drawing the circuit
schematic, so maybe it will be a little more clear after that. Initially it
appears that three connections are to capacitors or resistors, and one to a
small transformer. I don't believe there are any direct connections to power
or ground.

Thanks for the help,

Steve

{Original Message removed}

2004\08\15@200637 by Spehro Pefhany

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At 06:40 PM 8/15/2004 -0500, you wrote:
>On the silkscreen it is labeled as "U1", indicating a semiconductor device.
>It is pretty much identical to a transistor can, but the transistors are
>labeled "Q*".  There are no other marks on the board around this device. I
>can't get any pictures of it right now. Supply to the board is DC, so it
>wouldn't be a power rectifier. I'm in the process of drawing the circuit
>schematic, so maybe it will be a little more clear after that. Initially it
>appears that three connections are to capacitors or resistors, and one to a
>small transformer. I don't believe there are any direct connections to power
>or ground.


If it is a precision reference, it might be the self-ovenized LM199 etc.
that come in a 4-lead TO-46 package, but usually they would have an
insulator around them to keep them from sucking excessive watts.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speffspamKILLspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2004\08\16@000818 by Rich

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Did you try ringing out the connections to determine what they connect to?
If you know where they go it will help determine what they do.


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