[DSP-10] Q105 & Q106 Orientation

Thu, 4 Sep 2003 18:59:11 -0700

Hi Gerry,

Here's the story...

Q105 and Q106 are Zetex ZVP2106A MOSFETs.  If you look down on the top of
the package, you will see a slight "D" shape to the package.  The "D" shape
is not as pronounced as a TO-92 package.  The writing is located in the
curved part of the "D".  So the curved part of the "D" should face toward
the edge of the PCB.

Another way to check is to go to the Digi-Key web site
(http://www.digikey.com) and type in "ZVP2106A" in the parts search.  Scroll
down to about the lower-middle part of the page and click on the
"Technical/Catalog Information" link.  There you can download the data sheet
and read up on the pin out and compare with the DSP-10 schematic.  (This
technique is really handy when trying to locate a datasheet rather than
going to each individual manufacturer's web site).

Let me know if this helps.

73,

- Steve, N7HPR
 ([email protected])

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Gerry Morgan
> Sent: Thursday, September 04, 2003 3:03 PM
> To: [email protected]
> Subject: [DSP-10] Q105 & Q106 Orientation
>
>
> Greetings
>
> I'm sure this has come up before, but I cannot see it in the
> archives.  I am working on a recent DSP kit from TAPR.  I have
> just gotten to putting in Q105 & Q106 following Steve's, N7HPR,
> Assembly Manual.  I inserted the MOSFETs with the writing visible
> on the side near the edge.  However I now notice that the chip
> info is on both sides of the MOSFETs.  The sides facing the edge
> are mostly white with bevelled edges while the writing on the
> other black sides is quite faint (the edges on these sides are
> sharp).  I think that I have inserted the components in the wrong
> way around based on my first look at the schematic.  Has anyone
> had problems unsoldering the ICs and reusing them?
>
> Any comments would be appreciated.
>
> Regards
>
> Gerry Morgan, EI2CH
>
>
>
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