Re: DIY Phantom Power (was: fostex fr-2le high frequency noise)

["Mike Feldman" gidney_n_cloyd]

On 06 Jun, 2008, at 12:12 PM, Curt Olson wrote:

> And are the two resistors per channel series or parallel?

Yes the two resistors are in series and in parallel --
in series as viewed from XLR pins 2 and 3, and in
parallel as viewed from the source of 48 volts.

                      +------/]/]/]/]/]/]--------- 2
                       |
        +---------+      2x 6800 Ohms (comma free!)
         |             |
    +   |            +------/]/]/]/]/]/]--------- 3
       48 vDC
     -   |
         +---------------------------------- 1

That probably won't line up very well in everyone's mail reader.

By the way it's worth it to match the pair of resistors as closely
as you can.  I bought a bag of a hundred and spent some time
with a 4 1/2 digit DMM sorting them into several piles.