[Lowfer] Parts for ZL1BPU DDS exciter

[Lyle Koehler]

This is an updated re-posting of a message that got lost while the reflector
was down.
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So far I have received requests for sets of parts from Dex McIntyre (2
sets), Mike Reid, Ralph Hartwell, Steven Brooks, Ron Kolarik and Peter
Barick. I have ordered 10 sets of parts, which gives a price break on a few
of the components, and that means that there are two extra sets if any
late-comers want to join in. For those who missed the original thread, the
ZL1BPU exciter project is described at
http://www.qsl.net/zl1bpu/micro/EXCITER/Index.htm

I can provide all of the board-mounted parts for $30 postpaid in the US.
That should cover my mailing costs and the shipping costs from the two
suppliers (Digi-Key and Pioneer Standard). A detailed listing of the parts I
intend to provide is at www.qsl.net/k0lr/DDS-parts.htm  This list may be
useful for others who have a well-stocked junkbox and are only interested in
finding US suppliers for some of the more exotic items. The prices shown are
for an order quantity of 10 complete sets of parts. In most cases there is
little or no difference from the single-unit price, except for big-ticket
items like the TCXO. Oh, by the way, I *do* realize that I'm paying more for
5% resistors than for 1% resistors, but I have trouble seeing the color
codes on those darned precision resistors, so I use them only when
necessary!

Note that the list of parts does NOT include the case, circuit board, LEDs,
power and RF connectors, panel-mounted RF level pot, or the cables for
firmware programming and the PC serial interface cable (although a DB-9
female connector and a 10-pin firmware programming header are included). I
plan to load the firmware into the AVR microprocessors, which theoretically
is a one-time effort, so the firmware programming cable is optional. The
remaining necessary items should be available at Radio Shack for under $20.
It may be possible to squeeze everything on a Radio Shack 276-168 general
purpose prototyping board, but the 276-147 board looks a little closer to
the size that Murray used for his prototype.

Besides the TCXO, the parts list includes a few "add ons" that are not on
Murray's list, such as IC sockets, a 2.8 volt regulator (the TCXO is a
3-volt part), a 74HC4046 which is used as a buffer for the TCXO output, and
a 74HC4024 (divide by 128) that can provide a 100-kHz reference output,
which may be useful for precise adjustment of the 12.8 MHz TCXO. The TCXO
has a control pin that can be used for tweaking the frequency by +/- a few
parts per million, and an
on-board "calibration" pot is included in the list.

Barring disasters such as parts not in stock, parts that turn out to be
surface mount (other than the TCXO, which I already know about), etc, I
should have all the stuff in hand and have my exciter built within a few
days. My shipping schedule depends upon whether I run into any problems in
getting my own exciter working...

Lyle, K0LR