Alarm clock radio - Speaker POP!

Discussion in 'Electronics Repair' started by Hawkeye, May 17, 2011.

  1. Hawkeye

    Hawkeye

    Joined:
    May 17, 2011
    Messages:
    2
    Greetings all!

    I have an old favorite alarm clock radio which has very good sound quality. However when it turns on every morning, it makes a startling "pop" sound followed by normal music volume. Is there some type simple electronic repair for this problem? - for example some passive component(s) that could simply be added at the speaker terminals?

    Any advice is appreciated!
    Hawkeye, May 17, 2011
    #1
  2. Hawkeye

    duke37 VIP Member

    Joined:
    Jan 9, 2011
    Messages:
    2,631
    Location:
    Derbyshire. UK
    Some high power audio amplifiers use a relay to isolate the speaker until the amplifier output has settled down. You could perhaps fit a relay to do this job if there is room. A gently turned on MOSFET would do a similar job. The problem may be that an electrolytic capacitor in the radio supply has gone low in capacity letting the supply rise at a much faster rate than it should. If this is the case, there may be more than normal hum.
    Is the clock valved (tubed) or transistorised and do you have a cicuit?
    duke37, May 17, 2011
    #2
  3. Hawkeye

    Hawkeye

    Joined:
    May 17, 2011
    Messages:
    2
    Duke, thanks for the response.
    The clock is solid state/transistorized. I do not have a schematic so thats why I was hoping for an "add-on" solution at the output/speaker.
    There is no audible "hum".
    Hawkeye, May 18, 2011
    #3

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