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Doing the BOM

A project log for Yet Another Pi Zero USB Hub

Thought you'd seen enough Pi Zero USB hubs? You're Right!3-port USB hub, 12 V power in (2A capacity), and audio output for the Pi Zero

BenchoffBenchoff 01/12/2016 at 02:040 Comments

A few more revisions until I'm away from Eagle for a few weeks. I've updated the schematic, fixed a few major issues, and added an audio amplifier. Yes, it's a fantastically stupid idea, but I can see the value in having an optional 2 Watt class D audio amp on this board.

With that addition, I've run out of room on the board. Therefore, it's time for the BOM.

Part Value Device Digikey Part No. Unit Price 1k
C1 10uF CAP_POL1206

C2 10uF CAP_POL1206

C3 0.1uF 0.1UF-25V(+80/-20%)(0603)

C4 0.1uF 0.1UF-25V(+80/-20%)(0603)

C5 10uF CAP_POL1206

C6 10uF CAP0603-CAP

C7 10uF CAP0603-CAP

C8 0.1uF CAP0603-CAP

C10 10uF CAP0603-CAP

C11 10uF CAP0603-CAP

C14 33nF CAP0603-CAP

C15 33nF CAP0603-CAP

F1 PTCSMD PTCSMD F2110CT-ND 0.22
F2 PTCSMD PTCSMD F2110CT-ND 0.22
JP1 POWER_JACKPTH_BREAD POWER_JACKPTH_BREAD Adafruit 373 0.76
JP2 3.5mm Audio Jack SMD AUDIO-JACKSMD2 CP-43515TSSJCT-ND 0.59
Q1 12MHz CRYSTALCTS406 CTX855CT-ND 0.75
R1 2.7k RESISTOR0603

R4 270R RESISTOR0603-RES

R5 270R RESISTOR0603-RES

R7 150R RESISTOR0603-RES

R9 150R RESISTOR0603-RES

S1 SWITCH-MOMENTARY-2SMD-1101NE SWITCH-MOMENTARY-2SMD-1101NE CKN10388CT-ND 0.33
USB1 USB_TYPE_A_FEMALE_TH USB_TYPE_A_FEMALE_TH A31726-ND 0.797
USB2 USB_TYPE_A_FEMALE_TH USB_TYPE_A_FEMALE_TH A31726-ND 0.797
D3 PRTR5VV0U2X PRTR5VV0U2X 568-4140-1-ND 0.202
Power IC buck regulator TPS62143RGTR 296-39448-1-ND 0.99
D1 PRTR5VV0U2X ESD Protection Diodes 568-4140-1-ND 0.202
D2 PRTR5VV0U2X ESD Protection Diodes 568-4140-1-ND 0.202
R10 CRCW0402100KFKED 100k Ohm 0402 541-100KLCT-ND 0.02
L1 IHLP1212BZER2R2M11 IHLP1212BZER2R2M11 541-1322-1-ND 0.75
C18 TMK316BJ106KL-T 10uF cap 1206 587-1337-1-ND 0.07
C17 TMK316BJ106KL-T 10uF cap 1206 587-1337-1-ND 0.07
C16 TMK316BJ106KL-T 10uF cap 1206 587-1337-1-ND 0.07
IC3 TPA2016D2RTJR TPA2016D2RTJR 296-25430-2-ND 1.46
USB FE1.1S FE1.1S N/A 0.66

capacitors and resistors aren't free, but they're free enough. I did the math for 1k units on this, just to demonstrate how fantastically stupid manufacturing this would be.

In 1k quantities, the BOM for this board is $9.16. With the resistors and caps and board, it's going to be $10. If this were a product, it would sell for $20-25 without the Raspberry Pi Zero, or just a tiny bit less than a proper Raspberry Pi.

Nevertheless, there's a value in making stuff small, so I'll be making a few of these for personal projects. The github for this project has the updated schematic.

The next task, before sending this out for a real fabrication, is a refactor of the entire project. Looking over the BOM, there are some fantastically stupid choices here.

Here's a digikey cart

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