Announcement

Collapse
No announcement yet.

Audio Amp circuit for Gen4 display?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Audio Amp circuit for Gen4 display?

    Anyone have a suggestion for an extremely small (and preferably inexpensive) audio amp circuit that can be used to replicate the functionality of the built in speaker on the older displays on a Gen4 display?

    -K
    Last edited by kad; 3 weeks ago.

  • #2
    Good day,

    Basically you just need to use a low pass RC filter on the PWM output to get analog signal, then hook it up to any audio amplifier. The amplifier circuit should also have an enable/disable pin to replicate the older versions.
    You can check these modules for reference:
    https://www.adafruit.com/product/2130
    https://www.sparkfun.com/products/11044

    Best Regards,

    Comment


    • #3
      Originally posted by Jerson View Post
      Good day,

      Basically you just need to use a low pass RC filter on the PWM output to get analog signal, then hook it up to any audio amplifier. The amplifier circuit should also have an enable/disable pin to replicate the older versions.

      Jerson,
      Given a typical RC filter setup (see image below), do you have a recommendation for the resistor and capacitor values to use with a Gen4 display? Also, is the audio out pin a 3.3v pin or a 5v pin?

      Click image for larger version

Name:	RC_low-pass_filter_19.jpg
Views:	11
Size:	13.5 KB
ID:	74028

      -K

      Comment


      • #4
        Hi,

        The output pin is 3.3 V. You can try replicating the filter section used by the older display modules since it is optimized for that application.

        Click image for larger version

Name:	Filter.PNG
Views:	10
Size:	45.2 KB
ID:	74031

        Best Regards,

        Comment

        Working...
        X