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Thread: Schematic Review: Modified Teensy 3.5 Circuit

  1. #1
    Junior Member
    Join Date
    Mar 2020
    Posts
    3

    Schematic Review: Modified Teensy 3.5 Circuit

    Posted this in General Discussion, but I realize it makes more sense here:

    I'm making a custom PCB for my neuroscience lab to record and generate different signals during experimentation. We're currently using the Teensy 3.5 for the 5V tolerant input pins and 2 DAC outs for true analog outputs.

    With our PCB, I wanted to have multiple possible power inputs, as USB alone from a hub often does not yield enought current (~250mA needed). I'm aware of powered USB hubs but I wanted a direct option if that is unavailable. I used diodes to handle the different input voltages. We also take in signals and voltage from a rotary encoder, and have several analog and digital I/O through BNC. The PCB will end up in a metal enclosure roughly 110mm x 80 mm, with height 30 mm.

    My schematic is not too different from the 3.5 schematic, just with those added features.


    My main questions are how to add capacitors and a ground plane to the crystals, and whether my diode OR-ing logic makes sense.

    Any feedback or suggestions are greatly appreciated. This is my first PCB design, and I'm using EAGLE.


    https://drive.google.com/file/d/1qg2...ew?usp=sharing

  2. #2
    Senior Member
    Join Date
    Apr 2019
    Posts
    108
    You need to give us access. Can you post a PDF instead?

  3. #3
    Junior Member
    Join Date
    Mar 2020
    Posts
    3
    Sorry about that! Thanks for letting me know. I changed the settings on the link sharing and I've attached the pdf here.
    lab_sch.pdf

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