"Richard J Kinch" wrote in message
. ..
Look, if you want an air analog to an electrical transformer, you would
have to have an air motor (not a diaphragm regulator) doing the pressure
reduction, with the motor output used to regeneratively compress more
free air. That way, power would be conserved, like a transformer,
subject to some mechanical inefficiency.

Actually, that'd be a rotary phase converter type deal. An inverter would
be a whistle, and a transformer would be acoustical in nature. This makes
sense since the only way to regulate DC is a variable resistance (as a
pass or shunt regulator), likewise it is for air at pressure.

Tim

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