My experience is also like Harold and ML - switching power supplies often
need a minimum load in order to regulate properly. In general, switching
power supplies are not as 'clean' as a linear power supply, for audio
applications.

So...you can add resistive loads to ensure that there's a minimum current
draw of 200 mA from the supply at all times, you can try to fix the supply
(pain in the bum), or you can simply make a 12v linear supply with a LM7812
regulator. Depending on your current requirement, you might even find a big
wall-wart supply that can supply enough current at 12 v.


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