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BOM --- minitrash

A. core pcb:

ICs/regulators/etc:

  • wm8731 (SSOP 28) : 1 x (mouser # 238-WM8731SEDS/V)
  • TL072 (SOIC-8): 3 x (or use something fancier for audio i/o; in which case: 1 x TL072 + 2 x something fancier)
  • ADP150 (3v3 regulator, TSOT): 1 x (mouser # 584-ADP150AUJZ-3.3R7)
  • SM5817 diodes : 2 x (mouser # 833-SM5817PL-TP)
  • LM1117-50 (5v0 LDO reg., SOT-223): 1 x (mouser # 511-LD1117S50)
  • lm4040-5v0 (sot-23) : 1 x
  • teensy3.1 : 1 x (don't forget to cut the usb/power trace)

resistors (0603):

  • 100R : 2 x
  • 120R : 2 x
  • 510R : 1 x
  • 910R : 2 x
  • 1k : 2 x
  • 4k7 : 2 x
  • 5k6 : 2 x
  • 27k : 4 x
  • 30k : 1 x (††)
  • 33k : 2 x (*)
  • 47k : 3 x (††)
  • 100k : 6 x (*)

caps, SMD:

  • 15p (NP0/C0G): 2 x (0603)
  • 10n (NP0/C0G): 2 x (0805 or 1206)
  • 68n (NP0/C0G): 2 x (0805)
  • 100n : 22 x (0603)
  • 10uF : 5 x (0805) (ceramic or tantalum)

electrolytic caps, through-hole:

  • 22uF (35V or better): 2 x (power decoupling)
  • 10uF (16V or better): 2 x (in audio path/AC coupling)

misc:

  • 2x5 pin pin header (euro power connector): 1 x
  • 3-pin single row precision ("machined" / "round") socket (female), RM 2.54mm : 1 x
  • 5-pin single row precision ("machined" / "round") socket (female), RM 2.54mm : 2 x
  • 10-pin single row precision ("machined" / "round") socket (female), RM 2.54mm : 1 x
  • 14-pin single row precision ("machined" / "round") socket (female), RM 2.54mm : 2 x
  • 3-pin single row precision ("machined" / "round") pin header (male), RM 2.54mm : 1 x
  • 14-pin single row precision ("machined" / "round") pin headers (male), RM 2.54mm : 2 x

optional:

  • microSD socket (molex) : 1 x (# 502774-0891, mouser # 538-502774-0891)
  • SOIC-8 spi flash (W25), e.g. winbond W25Q128FV.
  • alternatively, SOIC-8 spi RAM, notably microchip 23LC1024, does fit, too.
  • lm4040-2v5 or lm4040-3v0 (sot-23, for teensy 3.x AREF) (NB: in this case, some resistor values need adjustment. see note below)

B. control pcb:

  • NPN transistors (MMBT3904, SOT-23) : 2 x

0603 resistors:

  • 0R : 1 x (or use piece of wire)
  • 470R : 2 x (adust, depending on LED)
  • 510R : 2 x (or use 470R, value is non-critical)
  • 33k : 2 x (may be 0805)
  • 100k : 2 x (may be 0805)

0603 caps:

  • 100n : 2 x

0805 caps:

  • 1uF : 4 x (may be 1206)

misc:

  • 1k-10k 9mm pots, vertical "tall trimmer" / song huei : 4 x
  • jacks, thonkiconn : 8 x
  • tact switches, illuminated - recommended is e-switch TL1265 series: 2 x (†)
  • M3 spacer/standoff 10mm : 1 x
  • M3 screws, 5mm : 2 x
  • 5-pin single row precision ("machined" / "round") pin headers (male), RM 2.54mm : 2 x
  • 10-pin single row precision ("machined" / "round") pin headers (male), RM 2.54mm : 1 x

notes:

( * ) if using a LM4040 for AREF, the CV range needs adjustment. for instance, when using a lm4040-3v0, the effective range reduces to 0 - 3v0. to compensate, use 110k resistors instead. the CV inputs are inverting op amps, so 33/110 * 10V = 3.0V; ditto for lm4040-2v5 -- in this case, 30k and 120k would get you there (30/120 * 10V = 2.5V)

( † ) e.g. mouser # 612-TL1265YQSCLR (yellow), 612-TL1265BQSCLR (blue), 612-TL1265RQSCLR (red), 612-TL1265GQSCLR (green); if illumination isn't a must, any 5x5 (ish) switch should do. e.g. TL1105SPF250Q (+ caps)

(††) used for voltage divider / V_bias (NB: labelled 10k* on the silkscreen -- use 47k/30k instead (see build doc))