[sdiy] power woes

[Barry Klein]

Oh, and watch out for plug polarity.  Looks like the Dunlop is negative 
center.
Is this because they want the ground to contact first when plugged in?

Barry

----- Original Message ----- 
From: "dan snazelle" <subjectivity at hotmail.com>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, March 06, 2010 7:15 AM
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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