[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [Discuss-gnuradio] RE: USRP + case = electrical short?? EXPLAINED
From: |
Weber, Michael J. \(US SSA\) |
Subject: |
RE: [Discuss-gnuradio] RE: USRP + case = electrical short?? EXPLAINED |
Date: |
Thu, 8 Mar 2007 13:41:19 -0500 |
This thread related to the USRP version 4.2, 10-2-2006. As you point
out, the v3 boards have a smaller heatsink pad.
Best,
Mike
-----Original Message-----
From: address@hidden
[mailto:address@hidden
On Behalf Of Brett Trotter
Sent: Wednesday, March 07, 2007 5:52 AM
To: address@hidden
Subject: [Discuss-gnuradio] RE: USRP + case = electrical short??
EXPLAINED
Out of curiosity, what generation USRP do you have? My Rev 3 board has
quite a lot of clearance on the TX-B side (1/4"ish- not measured)
Weber, Michael J. (US SSA) wrote:
>
> I have identified the cause of the shorting issue I was experiencing
> and thought I would share. The bottom-left corner mounting hole of the
> USRP passes very close to the internal heat sink pad for the 3.3V
> regulator; this pad is at 3.3V due to the regulator design (tab is
> hot). Some of the green board mask had scraped off when the mounting
> post for the Side B daughtercards was installed, which brought that
> mounting post, and by extension the enclosure, to the 3.3V potential.
> Photos of the board site are at http://www.likesgadgets.com/gr/ When
> the SMA jumpers connected the ground to the case, a short occurred.
...