Jinx wrote:

>
> Shouldn't be necessary. A transformer is normally used for
> impedance matching - what you are looking for is voltage
> matching (or rather voltage dropping, therefore a resistor)
>
>

For most headphone impedances a 600ohm/600ohm transformer will give you the
isolation you need without impedance matching problems. Jameco has them for a
buck or so. You could use the phone line transformer out of an old modem card
too, but you might suffer just a little high frequency loss but no so bad.
Rick

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