[sdiy] Noisy Power Supply

[John Luciani]

On 6/21/07, Scott <Scott at scottwick.com> wrote:

> One last thing, someone asked is this only when it is under a load, and
> it is actually the opposite.  When I plug it in w/ no load, or w/ only
> one low powered module, the problem isn't there.  As soon as I plug in a
> few more modules, I see the spike.

Since the ripple goes away without a load and the ripple is ~50Hz it
sounds like you have a linear supply with a bad filter capacitor.

After *all* the capacitors are discharged you could do a visual
inspection for bulging filter capacitors. Look at the pressure relief
device on the top of each cap. You could also take a look at the
capacitor solder joints.

(* jcl *)

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