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Problem with usb mp3 kid player project

Discussion in 'Audio' started by Nafeel, Feb 14, 2018.

  1. Nafeel

    Nafeel

    3
    0
    Feb 14, 2018
    Hi, i am very new for here

    I recently build a mp3 & FM radio player by using
    • Usb mp3 Kit
    • PAM8403 5V amplifier
    • 2 3W 4ohms speakers
    • 230 Ac to 5 dc transformer power supply
    My power supply is 230v to 6v step down transformer with diode bridge circuit

    However, when I connect these together with power supply , something is wrong. On connecting power, the speakers produce loud clicks and players also blink

    After i gave power separately
    For player from transformer circuit
    For amplifier from a 3v dc battery

    Then it was fine
    I can't catch above problem
    Please help me
     
  2. Tha fios agaibh

    Tha fios agaibh

    1,911
    600
    Aug 11, 2014
    Sounds like power supply is too small.
    Check that the power supply can deliver the current required to drive your load.
     
  3. Audioguru

    Audioguru

    2,580
    585
    Sep 24, 2016
    The absolute maximum power supply voltage for the PAM8403 is 6.0V. Your 230V to 6VAC transformer output might be 7V or 8V AC when not at its full load then the peak is 8V x 1.414= 11.3V and the rectifier bridge reduces it to 9.5V which might destroy the PAM8403 amplifier.
     
  4. Nafeel

    Nafeel

    3
    0
    Feb 14, 2018
    No
    I setup & send it through a transistor ic 7805 and some resistor and check the voltage between the amplifier circuit using
    multimeter and it shows 3v

    Again same problem occurs
     
  5. Audioguru

    Audioguru

    2,580
    585
    Sep 24, 2016
    The 7805 with proper input and output capacitors is fine. Where and why did you add "some resistor"?
     
  6. Nafeel

    Nafeel

    3
    0
    Feb 14, 2018
    To reduce the voltage
    Because pam8403 amplifier circuit get 3v only otherwise the speakers produce loud click
     
  7. Audioguru

    Audioguru

    2,580
    585
    Sep 24, 2016
    A resistor does not simply reduce the voltage. The resistor reduces the current that the amplifier needs then the reduced current reduces the voltage.

    Please post a schematic of how you connected everything together. Maybe your PAM amplifier is missing input coupling capacitors or resistors.
     
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