[sdiy] Patchell's modules

[Ken Stone]

My thoughts on the Vocal filter and beginners assembling it - As people no
doubt know, I have considerable experience in electronics and assembly, and
yet I find the vocal filter a rather daunting task. The board took many hour
to assemble, and I am still procrastinating on wiring up the panel a couple
of years down the track.

Simply put, the larger a project, the greater the chance of the
inexperienced making one or several mistakes (or the experienced making
mistakes for that matter) and the inexperienced usually have very few
troubleshooting skills to fall back on.

Ken 

>>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
>***************************************************************
>http://www.oldcrows.net/~patchell
>
>***************************************************************
>
>
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>