t3ddftw / BlueBus - History

[IMP] hardware: Rev D

* Remove TL064A
* Remove associated passives
* Remove PCM5102 and add PCM5122 in I2C Mode
* Change output filter on PCM5122 for a higher load
* Re-layout the telephone IO components
* Move Logo
* Rev to D
* Add decently sized and plated mounting holes

[IMP] hardware: Add Drill Legend & Connect DTR

* Add Drill Legend and Drawing info for PCB manufacture
* Connect DTR pin on FT232RL to PIC24 for terminal detection
* Condense Parts list

[IMP] hardware: Rev C Updates

* Ground Shields for USB and S/PDIF
* Wire S/PDIF directly to WM8804 output
* Replace Microphone resistor with 2kohm
* Replace output load impedance resistors on Audio with 110ohm

[IMP] hardware: Minor Rev C updates
* Route TX/RX LED signals to correct LED
* 25LC1024 swap
* Align OSHW / BlueBus Logo correctly

[IMP] hardware: Rev C
* Add TL064A to reduce IBus noise and attenuate the gain of the DAC
* Add WM8804 to convert S/PDIF to I2S
* Add circuitry to emulate factory Telephone
* Add connector for factory telephone
* Add circuitry to drive the OE Microphone
* Add CE symbol
* Add ability to shut off the board via the TH3122

[IMP] hardware: BlueBus Rev C
* Add MOSFETs to handle TCU ON / Mute Signaling
* Add PAM8406 for call audio output
* Add WM8804 for S/PDIF to I2S conversion so that both S/PDIF and I2S can be available at the same time
* Use PCM5122A with I2C mode
* Add microphone input jack
* Update USB jack to use a through-hole connector
* Add cut-out for 6-pin connector snap clip

[IMP] hardware: Minor silkscreen updates
* Update silkscreen
* Ensure 5v rail is fed post capacitor [not that it should matter]

[FIX] hardware: Reb B PCB Silkscreen
* Update Silkscreen names so they are not covered by pads
* Update a couple of small traces

[FIX] hardware: Reb B PCB
* Add TS5A22364 switch to ground L/R while not playing
* Add TMUX154E in place of tri-state buffer as a UART switch
* Replace FT232RQ with FT232L which will be easier to solder
* Add voltage divider on analog audio output to conform with TS5A22364 specs

[IMP] hardware: Minor Rewiring and alignment changes
* Improve wiring around FT232R
* Move passives around to allow more room for ground plane
* Update Net Names so they make sense