1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

HC-05 and annoying pulsation

Discussion in 'Arduino' started by mauros, Oct 1, 2017.

  1. mauros

    mauros Member

    Joined:
    Apr 25, 2017
    Messages:
    53
    Likes:
    0
  2. mauros

    mauros Member

    Joined:
    Apr 25, 2017
    Messages:
    53
    Likes:
    0
    I desolded the HC-05 led but the pulse remained. I then powered through this https://www.parts-express.com/calin...18v-guitar-effect-pedal-power-supply--245-100, which does not have real isolated outputs, because they have the common mass but at least they are filtered one by one, and I powered the stomp boxes separately, all at output at 100mA, except the Zoom that absorbs 500mA and connected it to the output 500 mA. At this point, I did converge the power supply ground on all the enclosures, and I got the absolute silence but it happens ...

    if I turn on the wah wha (bought new and I keep it with the potentiometer closed, I hear a hum and if at the same time I turn on the booster (made by me) that is after the wah, the hum disappears as if the noise loses inside booster, after which there is the amplifier. Here, if I could remove this other hum, I would be more relaxed :)
     
  3. cowboybob

    cowboybob Well-Known Member Most Helpful Member

    Joined:
    Oct 22, 2011
    Messages:
    3,037
    Likes:
    478
    Location:
    James Island, SC
    Good. As I expected.
    Keep chasing the grounds...
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. mauros

    mauros Member

    Joined:
    Apr 25, 2017
    Messages:
    53
    Likes:
    0

    I also removed ground from wah's power supply but unsuccessfully
     
  6. cowboybob

    cowboybob Well-Known Member Most Helpful Member

    Joined:
    Oct 22, 2011
    Messages:
    3,037
    Likes:
    478
    Location:
    James Island, SC
    Why?
     
  7. mauros

    mauros Member

    Joined:
    Apr 25, 2017
    Messages:
    53
    Likes:
    0
    eventual ground loop ... it works the same because ground gets it from the cables too
     

Share This Page