[sdiy] power woes

[Scott Nordlund]

The ones that cause hum (what kind of hum?) may not be capable of supplying adequate current.

The ones that cause whine (what kind of whine?) could be interfering in a variety of ways.  If the voltage coming from the adapter is noisy, try a snap-on ferrite choke thing, like the Evolver has on its power supply.  It could also be some sort of RF interference with your circuit.

----------------------------------------
> From: subjectivity at hotmail.com
> Date: Sat, 6 Mar 2010 10:15:15 -0500
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] power woes
>
> Ok
>
> I am sitting here with a pile of DC adapters. (trying to find one to bundle with my products)
>
> half of them cause HUM, half of them cause a whine (switching)
>
> Only 2 out of the pile don't cause ANY noise
>
>
> One is a DUNLOP class 2, 60hz 7w, 9vdc 200ma adapter which is made in china and has a chinese model number of
>
> ad-0920
>
>
> i can find these online for $12-15 dollars a piece
>
>
>
> the other is one of the new BOSS switching adapters.
>
> (it costs 30 bucks!)
>
>
> one of the odd things is that some of the switching adapters or class 2 adapters have
> seemingly the same SPECS but cause different problems or noise
>
>
> SO...my question is whether anyone has any advice on DC adapters
>
>
> i might be able to get a bunch from dunlop but it still doesnt answer WHY some cause noise and some dont
>
>
> thanks so much!
>
>
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