Jerry (and pmfalcman) is (are) of course right.
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By all means measure your P48V and 9V before doing the arithmetic.? Da P48V is specifically important as many so called Prosumer 'P48' devices may be much less.? I ask people to do this in simpleP48.pdf to give tested values for various capsules.
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Please keep sending me these test results for simpleP48.pdf for those (shock horror !!) who are MicBuilding without a multimeter.
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But we are shooting at a broad target; 5 - 10V.? Drawing Fig 6 in FETbias.doc has highlighted the consequences of just using E24 resistors.? It has also prompted me to personally go again for 5V instead of 10V .. something I keep vacillating between. :)
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I have to resist making the circuit more complex to 'cure' its shortcomings.? But then my failing eyesight and deteriorating soldering skills won't let me fit even one extra bit inside a male XLR.
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There's also an even simpler circuit but IMHO, this sacrifices stuff like simpleP48's excellent RFI/EMI immunity etc .. lesser known features that distinguish good mikes from great mikes.
