[DSP-10] Warning, cabling to P101 has +12 volts on it.

[David Garnier]

Fellow DSP10�ers

I have been having some back channel discussions about my DSP10 kit
and the problems I have run into.  I have decided to come out of the
closet
and make public. ;-)   This is a heads up for all.

Note, be careful how you wire the cable to P101 or how you insert this
cable onto your DSP10 board!!!  P101 has +12 volts on pin 1, if you
mistakenly wire the harness wrong or reverse inserting the connector
unto
the board, +12 volts could be placed onto one of the unbuffered data
lines
and toast the DSP chip (and maybe more.)  Been there, done that.  Note,
this error is difficult to do with the parts called out by W7PUA's parts
list
or the parts supplied in the TAPR kit, good job guys.

How did I do this you ask???  There's is very little slack for the
harnesses
to be pealed back for initial powering up or debug (my interpetation of
the QST pictures.)  During my debug process I built some prototype
harnesses which used AMP Mod 4 style housings and receptacles (the
quickest parts I could find that day.)  As I found out my AMP
receptacles
did not engage into the supplied housings so I used my AMP housings
(that
had no keying for mating.)  Late one night I reversed the harness going
to
P101 and +12 volts and was applied to Ser En 2 line...

The Newark part number for the DSP chip is 52F2097 and the cost
was about $45 dollars.  A note for all. Newark's shipping box had
Commercial  Invoice's attached to it (with Customs Harmonized Codes
called out for each of the items,) this implies Newark ships
internationally,
give them a call.

If this disaster happens to you contact me. I will be more that willing
to
use the "proper" surface mount tools (during my lunch hour) to swap the
chip for you, free.

73�s and goodluck to all.

dave garnier - wb9own