[sdiy] Patchell's modules

[James Patchell]

At 02:16 AM 4/16/2005 +0200, Andre Majorel wrote:
>Posting my questions to the list for the benefit of those
>interested in Jim's answers.
>
>Jim, what is the status of the vocal filter, wave shaper and
>multi-segment EG ? Are they "polished" enough that they can be
>built be someone who barely understands the design ? I have a
>scope (Tek 535A :->) but I'm not sure it can do X/Y (it does have
>a "horizontal" banana input).

         That is a tough question.  Of the three, the wave shaper is by far 
the simplest to build.  The Multi-segment EG is the most difficult, 
although, the vocal filter is a close second...(to put it in 
perspective...there are 106 bypass caps on the vocal filter...there are 
about a total of 600 parts that go on that board, and there is a lot of 
wiring that needs to be done to connect it to the front panel)....

         As far as the Tek 535A...well, it has been over 25 years since I 
have used one...I can't remember if it could do XY either...but it sure 
seems like every Tek scope I ever used could.


>Regarding the multi-segment EG, is there a possibility of getting
>a pre-programmed PAL from you along with the PCB ?

         Yes, I can supply the pre programmed PAL...I can also supply the 
THAT140 transistor array (they are not made anymore), but you can also just 
used regular 2n3904/2n3906 matched pairs as well (should work almost the 
same)...


>Finally, are your BOM files available in plain text format ? I
>need to enter the component counts in a spreadsheet (not really a
>spreadsheet, but you get the idea) and extracting the data from
>the PDF is... let's say "labour-intensive".

         Yes, I can post text versions of the BOM's...


>--
>André Majorel <amajorel at teaser.fr>
>http://www.teaser.fr/~amajorel/

         -Jim
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http://www.oldcrows.net/~patchell

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