Temp:How to fix the buzzing problem

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What is it and why it heappens

The buzzing problem is better described here: http://www.s1mp3.org/wiki/index.php/Temp:Problems_during_standalone_use#When_playing_songs_.28sometimes.2Falways.29_there_is_a_low_.22buzzing.22_sound_in_the_background_of_the_song There, you can find a solution different of this one described here.

What we need

You will need:

  • 220μf x 6.3v eletrolytic capacitors (2 units)
  • Pieces of tape
  • Pieces of wire
  • All you need for soldering

You can use capacitors with others voltages, for exemple, 4v (a not-usual value), which is smaller than 6.3v. 10v or 12v can be used also, but they are bigger. And if you dont get good results with 220μf, try 470μf or 680μf.

Just looking inside

Buzz1.jpg

  • Red arrow: Tantalum capacitor. This the main part which causes buzzing problem.
  • Yellow arrow: Negative battery lead (ground).
  • Green arrow: Negative usb connector.

Buzz2.jpg

Here, red arrow is positive side of tantalum capacitor. Blue one is the negative.

Working

Caution: Eletrolytics capacitors have correct polarity to use. They have negative marks (-) on the body. Take care with that during soldering.

  • The negative battery connector lead is the ground of the circuit (yellow arrow), and it is electrically connected to the negative side of the capacitor (blue arrow) and to the negative usb connector (green arrow). Solder one electrolytic capacitor between the positive side of the tantalum capacitor and the negative usb connector.
  • We have to reduce the ground connection path by soldering a wire beetween the negative battery connector lead and the negative usb connector.
  • Finally we have to solder the second electrolytic capacitor beetween the negative battery connector lead and the positive side of the tantalum capacitor.

Take care with isolation:

Buzz3.jpg

Look the first eletrolytic capacitor:

Buzz4.jpg

And the final job:

Buzz5.jpg