Possibly the closest there is to wire with power gain...
The complete setup from sound to recording
Caution: A gate resistor should possibly be included to avoid voltage build and possible damage to the mic transformer secondary when the microphone is connected.
The Pleiades K117 preamplifier inside Tuchel connector for MD421 HN and iPad, iPhone etc. No battery is needed as power comes directly from iPad's headphone mic socket which provides power for electret condenser microphone high to low impedance FET preamplifiers.
The cable with Pleiades K117 preamplifier inside Tuchel connector and schematic (pins shown are for XLR not Tuchel). The input transformer is not needed in this case as the Sennheiser MD421 HN HL already has one.
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