23 lines
1.3 KiB
Plaintext
23 lines
1.3 KiB
Plaintext
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revisions from v1:
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- incorrect footprint for 1/4'' jack (can make it work)
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- 7 segment displays can be closer together (footprints are exact)
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- usb diode array wrong footprint (sot666 should be sot23-6) [or order the correct footprint works too]
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- remove 1.3k ohm resistor on Vcc of optoisolator
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- remove grounding resistor (and ground connection) on pin 2 of the midi DIN
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- deisolate potentiometer rv3's ground island
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- add silkscreen text to the boot and enable buttons
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- add silkscreen text on the back detailing dimensions for board and holes
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- enable pin on esp32 needs a 10kohm pullup resistor and a 1uf pulldown capacitor, separate from the button circuit
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- remove 22 ohm in-line resistors on d+ and d- usb lines (o ohm resistor recommended by the datasheet)
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- probably remove the decoupling capacitors on the usb lines too
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- breakout i2s interface
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- buy 0 ohm resistors
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- you can afford a lot more room between chips and components (besides power capacitors)
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- somethings funky with op-amp U4 (it gets hot when powered). also add trimmer potentiometers to tune its gain
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- actually follow the datasheet for the pcm5102 man
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- 2.2nf instead of 2.2uf capacitors on the l/r audio out lines
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- tie mute pin directly to power source
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- theres a whole pcb layout section for TI chips
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- soldering tip: chips always go first
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