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Thread: Powering Teensy 3.2 from AA Batteries / Circuit Playground Express

  1. #1
    Junior Member
    Join Date
    Jun 2019
    Posts
    10

    Powering Teensy 3.2 from AA Batteries / Circuit Playground Express

    Hi All,

    Working on an Audio project where I'd like to power the Teensy 3.2, Adafruit Circuit Playground Express and small Mono audio amplifier off of 3 x AA batteries, and wondering on the best wiring for hooking them all together. I will be running the Teensy Audio Library on the 3.2, and reading the sensors from Circuit Playground over UART serial.

    Right now, I am planning to:
    Run the 3 x AA Batteries into CPX
    Take the Vout and GND from CPX to power audio amp

    I am wondering if it would make more sense to:
    Take Vout and GND from CPX to power Teensy 3.2 Vin and GND
    OR,
    Take 3.3V (regulated) out and GND from CPX to power Teensy 3.2 Vin and GND

    Is there one of the above options for powering the Teensy that would be more stable?

    From my understanding, sending the full ~4.5 volts from the batteries should hit the Teensy's Voltage Regulator if it goes through Teensy's Vin...which seems preferable.

    Thanks for the help!

    DS
    Last edited by sumnerdr; 06-05-2019 at 11:33 PM.

  2. #2
    Senior Member
    Join Date
    Oct 2015
    Location
    Roma (IT, EU)
    Posts
    189
    Some audio amps like 4.5V better than 3.3V, depending on the model.
    If that's the case, I would split 2 lines from the AA pack: one goes straight to the power amp, the other enters Teensy Vin. From 3.3V Teensy pin (regulated output, up to 300mA), power the CPX (provided you don't need more than 300mA between CTX and sensors).

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