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| This printed circuit development board was laid out 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 using pdfunite from poppler-utils)]] * [[attachment:SpiffChorderGerber.zip|compressed ZIP archive of Gerber files]] |
<<TableOfContents>> = 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: |
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| So far I'm using the same BoM from [[../KeyerPerfboard|the perfboard design]]. Here's a paper test using a 1:1 scale printout of the silkscreen and solder mask together: | * [[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)]] |
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| [[attachment:SpiffChorderPaperTest.png|{{attachment:SpiffChorderPaperTestThumb.png||SpiffChorder Paper Test}}]] | = Bill of Materials = So far I'm using the same BoM from [[ManMachine/KeyerPerfboard#Bill of Materials|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. |
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| 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. Also, the 0.1" pitch right-angle screw terminal blocks I used are just slightly longer than 0.4", so I lightly sanded down the facing sides until they fit snugly but evenly in a piece of perfboard and then attached them to one another with a tiny dab of quick-setting adhesive gel (being careful not to get it into the terminals themselves): | = Paper Placement Test = Here's a paper test using a 1:1 scale printout of the silkscreen and solder mask together: |
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| [[attachment:SpiffChorderScrewTerminalSanding.png|{{attachment:SpiffChorderScrewTerminalSandingThumb.png||SpiffChorder Screw Terminal Sanding}}]] | [[attachment:SpiffChorderPaperTest.jpg|{{attachment:SpiffChorderPaperTestThumb.jpg|SpiffChorder paper test}}]] = 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:ScrewTerminalSanding.jpg|screw terminal sanding}} {{attachment:ScrewTerminalsGlued.jpg|screw terminals glued}} = Condensed Board = For implementation in tighter spaces, I plan to design a stripped-down board omitting CON1, removing lines for M1-3 and UC from CON3 and the associated R15-18, using an 8-pin array (Digikey part MSP10KH-ND) for R8-14, reordering the remaining lines on CON3 to support more direct paths through the PCB, and replacing the GND line from CON4 with VCC like I did on the perfboard layout (since CON3 exposes GND anyway). I may also go with lower-profile parts for C4 and X1 so that skipping the socket for IC1 and the screw terminals for CON2-4 allow the assembly to be about half as thick. = ATmega32u4 = [[http://www.adafruit.com/products/296|Atmega32u4 Breakout Board]] |
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| [[../|back to The Man-Machine...]] | [[ManMachine|back to The Man-Machine...]] |
Contents
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:
Fritzing's schematic view (printed to PDF at 450x315mm with no margins)
an etchable PDF export from Fritzing (combined using pdfunite from poppler-utils)
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 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):
Condensed Board
For implementation in tighter spaces, I plan to design a stripped-down board omitting CON1, removing lines for M1-3 and UC from CON3 and the associated R15-18, using an 8-pin array (Digikey part MSP10KH-ND) for R8-14, reordering the remaining lines on CON3 to support more direct paths through the PCB, and replacing the GND line from CON4 with VCC like I did on the perfboard layout (since CON3 exposes GND anyway). I may also go with lower-profile parts for C4 and X1 so that skipping the socket for IC1 and the screw terminals for CON2-4 allow the assembly to be about half as thick.
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