[OZAPRS] IO PCB audio pTT etc

Glen English VK1XX glenlist at pacificmedia.com.au
Tue Jan 30 16:06:51 AEDT 2018

Today I have done a schematic for a board to plug into either Pi or 
Odroid, OR any platform with a USB for the usual requirements- audio I/O 
, PTT, a uart  and some spare pins for GPSPPS etc

Before I finalize it, are there any requests ?

Currently :

40 pin header for direct connection of IO to Odroid or RPi for 

On board USB audio device (PCM2903) for TX/RX audio  (two channels so 
can suit  IQ radio)

On board USB UART (FT230) for generating RTS for generating PTT, and 
gives you a 3.3V serial port

On board 8-30V in to 5V DCDC converter. quiet.

HW watchdog on PTT

Some IO for ? (2 x analog in, 2 x uart 1 x I2C)

should be buildable for $30 or less. all easy SMT sizes.

the idea is you can plug USB audio , USB uart  for any platform, or you 
can use the built in expansion header IO for PTT etc direct on a 
suitable board. IE good for PC or good for Odroid/PI.

green pluggable header for radio interface.

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