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BOM_rev.md

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/* BOM for temps utile, rev1, rev1.b, rev1.c */

OLED:

  • you can find these 7 pin, 1.3" displays on ebay, aliexpress and other places for < 10$. they'll be ok, as long as the description claims that they are SH1106 (or SSD1306); and that the pinout is:

    GND - VCC - D0 - D1 - RST - DC - CS, or

    GND - VCC - CLK - MOSI - RES - DC - CS, or

    GND - VDD - SCK - SDA - RES - DC - CS

  • make sure you get the right size: 1.3" (not 0.96")! and once you've received it, make sure the display is configured for SPI (see resistors/labels on the back side of the OLED).

  • alternatively, here are .brd/.sch files for a/the OLED carrier board. in that case, you'd need to get the bare OLED (and some passives). for example here (though there's cheaper options for getting bare OLEDs).

SMD resistors (0805):

value # part note
100R 4x 603-RC0805FR-07100RL 1%
510R 2x 603-RC0805JR-07510RL or simply use 1k, value not critical
1k 7x 603-RC0805FR-071KL 1%
1k2 1x 71-CRCW08051K20FKEA 1%
1k8 1x 71-CRCW0805-1.8K-E3 1%
3k 2x 660-RK73H2ATTD3001F 1%
3k9 2x 660-RK73H2ATTD3901F 1%
6k8 1x 660-RK73H2ATTD6801F 1%
10k 7x 660-RK73H2ATTD1002F 1% (‡)
20k 6x 71-CRCW0805-20K-E3 1% (‡)
33k 6x 660-RK73H2ATTD3302F 1%
100k 10x 660-RK73H2ATTD1003F 1%
  • (‡) the (digital) clock outputs are non-inverting op amps, the values on the pcb (20k feedback, 10k to ground) will result in 3x gain, or 9.9v on the outputs. adjust, if you like. for example, 15k would give you 3.3v * (20k/15k + 1) = 7.7, etc.

SMD caps (0805):

value # part note
1n 2x 581-08055A102J (NP0/C0G) (50V)
3n3 1x 77-VJ0805A332JXATBC (NP0/C0G) (50V)
18n 1x 81-GRM21B5C1H183JA1L (NP0/C0G) (50V)
100nF 9x 80-C0805C104K5R (25V or better)
470nF 5x 603-CC805ZRY5V9BB474 (25V or better)
1uF 2x 581-08055G105ZAT2A (25V or better)
10uF 1x 81-GRM21BR61E106KA3L (16V or better; may be 1206)

SMD caps (0603):

value # part note
10n 4x 81-GRM1885C1H103JA1D (NP0/C0G) (16V or better)

ICs/semis:

what package # part note
TL074 SOIC-14 2x 595-TL074CDR output amplifier
MCP6004 SOIC-14 1x 579-MCP6004T-I/SL CV input buffer
MMBT3904 SOT-23 2x 512-MMBT3904 NPN
1N5817 DO-41 2x 621-1N5817 Schottky, reverse voltage protection
LM1117-5v0 SOT-223 1x 511-LD1117S50 5v LDO
LM4040-5.0 SOT-23 1x 926-LM4040DIM350NOPB precision voltage reference, 5v0
fixed inductor, 10uH 1206 1x 81-LQH31MN100K03L > 25mA

misc through-hole/mechanical:

what package # part note
22uF 2.5mm 2x 647-UPM1V220MDD1TD electrolytic, 35V+
470nF 5mm 1x 505-MKS2C034701CJSSD film/ceramic, 35V+
78L33 TO-92 1x 511-L78L33ACZ 3v3 regulator
jacks - 12x PJ301M-12 'thonkiconn' (or kobiconn)
encoder w/ switch 9mm 2x 652-PEC11R-4220F-S24 20mm, D-shaft (‡)
2x5 male header 2.54mm 1x 649-67996-410HLF euro power connector
1x7 female socket 2.54mm 1x 517-929870-01-07-RA low profile socket (for OLED)
1x14 + 1 sockets+headers 2.54mm 2x - breakable, 'machine' pin (round pin) (†)
tact switches multimecs 5E/5G 2x 642-5GTH935 or 642-5ETH935 -
+ caps multimecs 5E/5G 2x 642-1SS09-15.0, or -16.0 -
teensy 3.x - 1x oshpark / mouser #: 485-2756 cut the usb/power trace!
OLED, 1.3" 7 pin 1x SH1106, 128x64 GND - VCC - D0 - D1 - RST - DC - CS (see note above)
spacer 10mm, 3M 1x 855-R30-1611000 -
jumpers - 1x - for DAC: use a piece of wire

  • (‡) rotary encoder w/ switch: alternatives include mouser # 652-PEC11R-4215F-S24 (15 mm, 'D' shaft); 652-PEC11R-4215K-S24 (15 mm shaft, knurled); 652-PEC11R-4220F-S24 (20 mm, 'D'), 652-PEC11R-4220K-S24 (20 mm, knurled), etc)

  • (†) also see the build guide: we need 14 pins on either side plus the DAC pin, so best to simply use 14 on the one side, and 13 + 2 on the other. the PCBs holes are small, so best to use so-called "machine" pin sockets + pin strip to match.