Differences between revisions 5 and 23 (spanning 18 versions)

Printed Circuit Board Layout

I used Fritzing to lay out a two-layer SpiffChorder development board and submitted an order for the prototype to Fritzing Fab. The fabrication cost for one unit, including international shipping to the USA, was roughly US$40. I'll post pictures once it arrives in a couple weeks and I have a chance to run tests, but here are some preliminary details:

Bill of Materials

So far I'm using the same BoM from the perfboard design, but I'll probably switch up CON1 with Digikey part 609-2845-ND (vertical rather than right-angle) so as not to block the lower-left mounting hole.

Paper Placement Test

Here's a paper test using a 1:1 scale printout of the silkscreen and solder mask together:

Connector Detail

The 0.1" pitch right-angle screw terminal blocks I used are just slightly longer than 0.4" each. So as to be able to fit the four for CON3-4 directly adjacent to one another, I lightly sanded the facing sides until they fit snugly but evenly in a piece of perfboard. In an effort to make it easier to solder these evenly on the board, I attached their sides together with a tiny dab of quick-setting adhesive gel (being careful not to get it into the terminals themselves):

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-The printed circuit version is in progress using [[http://fritzing.org/|Fritzing]], and an order has been placed to [[http://fab.fritzing.org/|Fritzing Fab]] for a prototype to QA. I'll post pictures once it arrives in a couple weeks, but here are some tidbits to tantalize:
 * [[attachment:SpiffChorder.fzz|Fritzing file]]
 * [[attachment:SpiffChorderSchematic.pdf|Fritzing's schematic view (printed to PDF at 450x315mm no margins)]]
 * [[attachment:SpiffChorderEtchable.pdf|etchable PDF export (combined with ''pdfunite'' from ''popler-utils'')]]
 * [[attachment:SpiffChorderGerber.zip|compressed ZIP archive of Gerber files]]
+= Printed Circuit Board Layout =
I used [[http://fritzing.org/|Fritzing]] to lay out a two-layer !SpiffChorder development board and submitted an order for the prototype to [[http://fab.fritzing.org/|Fritzing Fab]]. The fabrication cost for one unit, including international shipping to the USA, was roughly US$40. I'll post pictures once it arrives in a couple weeks and I have a chance to run tests, but here are some preliminary details:

 * [[attachment:SpiffChorder.fzz|a Fritzing FZZ file containing the PCB layout]]
 * [[attachment:SpiffChorderSchematic.pdf|Fritzing's schematic view (printed to PDF at 450x315mm with no margins)]]
 * [[attachment:SpiffChorderEtchable.pdf|an etchable PDF export from Fritzing (combined using pdfunite from poppler-utils)]]
 * [[attachment:SpiffChorderGerber.zip|a ZIP archive of the Gerber export files for the prototype (sent to me by Fritzing Fab)]]

= Bill of Materials =
So far I'm using the same BoM from [[ManMachine/KeyerPerfboard|the perfboard design]], but I'll probably switch up CON1 with Digikey part 609-2845-ND (vertical rather than right-angle) so as not to block the lower-left mounting hole.

= Paper Placement Test =
Here's a paper test using a 1:1 scale printout of the silkscreen and solder mask together:

[[attachment:SpiffChorderPaperTest.jpg|{{attachment:SpiffChorderPaperTestThumb.jpg|attachment:SpiffChorderPaperTest.jpg}}]]

= Connector Detail =

The 0.1" pitch right-angle screw terminal blocks I used are just slightly longer than 0.4" each. So as to be able to fit the four for CON3-4 directly adjacent to one another, I lightly sanded the facing sides until they fit snugly but evenly in a piece of perfboard. In an effort to make it easier to solder these evenly on the board, I attached their sides together with a tiny dab of quick-setting adhesive gel (being careful not to get it into the terminals themselves):

{{attachment:SpiffChorderScrewTerminalSanding.jpg}} {{attachment:SpiffChorderScrewTerminalsGlued.jpg}}
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