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• Finished circuit design!

  Giovanni Cimolin da Silva • 09/22/2015 at 13:04 • 0 comments

  I have finally finished the circuit design!

  It would be great to receive some feedback about my design.

  I am starting the PCB project this week.

  Here are a list of things that changed since the last update:

  -->Power supplies

  Two power supplies have been added, one for the analog side of the IC and the other for the digital part.

  I'm using two LM1117 low-dropout regulators from TI, which have 3v3 fixed voltage and +-1% accuracy.

  They are a bit of overkill but it is what I have in hand.

  -->Connectors

  I'm using a simple SIL 10 pin connector for communication and power, just to make it easy to plug into a breadboard.

  For the electrodes I've chosen to use T-Block connectors.

• Halfway through circuit design

  Giovanni Cimolin da Silva • 09/06/2015 at 23:23 • 0 comments

  I'm almost finishing the circuit design.

  All of the components values I've used are referenced in the datasheet of the IC.

  I'm making the circuit using single supply 5V input wich then is regulated to 3.3V in two regulators in the board.

  TODO:

  - Find insulated connectors for electrode connection

  - Design two power sources for the circuit: AVCC and DVDD

  - Design 5v<-->3v3 converters for I/O and comm pins

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