You can use the 210 mA adaptor safely as long as the polarity matches  
what the device needs (it should have a little diagram next to the  
plug or in the owner's manual). Match it with the polarity diagram on  
the adaptor and it will work.

The 210 mA is the maximum the adaptor will output. So if your device  
needs 100 mA then it can supply that. It will only put out the amount  
of current that the device needs.
---
Jon M. Hanson (N7ZVJ)
Homepage: http://the-hansons-az.net/drupal
Jabber IM: jon@the-hansons-az.net




On Jul 22, 2009, at 3:42 PM, Josef Lowder wrote:

> Does an AC/DC adaptor need to be an exact match to be safe and not
> damage electrical equipment?
>
> I have several dozen "left-over" AC/DC adaptors, but none exactly
> match a small Radio Shack mixer that is going through 9-volt batteries
> too fast.  And, rather than buying yet another such adaptor, I went
> through my collection of left-overs to see if I could find one to
> match.  Close, but not quite.
>
> I need a 9v 100 mA adaptor; and in my collection I have one 9v 80 mA
> and one 9v 210 mA.  Could either of those be used safely?
>
> One says it can be either a 6v 200 mA or a 7.5v 100 mA which leads me
> to think that perhaps there might be some flexibility in this.  I have
> a bunch of 9v at various mA ratings, along with a bunch of 3v, 5v, 6v,
> 8v, 11v, 12v, 15v, 19v at various mA ratings.
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