Quote:
Originally Posted by cyrano
5,6 V zeners are the quietest, but the gain in S/R is probably undone by a rise in temperature or so...
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True that. The biggest source of noise though I suspect would be the mic capsules. Your circuit already contains plenty of filtering for the zener so I'd expect that to be insignificant compared to the capsule noise.
Mobile phone headsets aren't typically known for their low self noise!
My suggestion with the 5.1 or 4.7 volt zener was more to err on the side of caution with the supply voltage to the Apple headset.