Forum Rule: Always post complete source code & details to reproduce any issue!
Results 1 to 5 of 5

Thread: Control input voltage to Teensy

  1. #1
    Junior Member
    Join Date
    Nov 2018
    Posts
    5

    Control input voltage to Teensy

    I have a circuit composed of a series of Op Amps acting as buffers and integratirs to amplify a small input signal. The final output is meant to be sent to a Teensy 3.2, but it is always between -0.5V and 0.5V. This would damage my Teensy since the input range for this model is between 0V to 3.3V.

    Does this mean I need to create a positive offset? how can I possibily create one?

  2. #2
    Senior Member+ Theremingenieur's Avatar
    Join Date
    Feb 2014
    Location
    Colmar, France
    Posts
    2,054
    The "state of the art" solution would use an op amp as an adder circuit.

  3. #3
    Junior Member
    Join Date
    Nov 2018
    Posts
    5
    Thanks! I will give it a try

  4. #4
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Posts
    18,651
    The safest way involves using an opamp powered by only 3.3V. That means needed a rail-to-rail output type if you want to use the full range. But then you at least know the opamp won't accidentally drive the pin hard to a large positive or negative voltage during startup, shutdown, or if something happens like a very fast transition on the input voltage - conditions where the opamp is momentarily not controlled by stable feedback and can briefly output almost anything.

  5. #5
    Junior Member
    Join Date
    Nov 2018
    Posts
    5
    Thanks, it brings up

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •