Gordon Williams wrote:
> I noticed the other day that the LED was pulsing and the supply was making a
> clicking sound at the same time of the pulses, at about 3 Hz.    The 12 V
> supply output was fluctuating wildly with no load.  When I loaded the supply
> with 200 mA current everything settled down with 11.5 V output and the LED
> stopped pulsing.  I don't remember that the supply was doing this pulsating
> under no-load originally when I started using it 2-3 years ago.  It's got me
> concerned that something is not working right.
>
> Could this be a sign that the power supply is starting to break down?  Is
> the clicking sound from the transformer?
>
> Suggestions?
>   

    Leaky capacitors. Open the power supply and verify.

    MJ


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