With low-level ultrasonic input signals, the Magnetic Resonance Amplifier (MRA) produces usable direct current power at levels above unity. This circuit is based upon the work and theories of John Ernst Worrell Keely, and is offered into the public domain in his memory.The Magnetic Resonance Amplifier (MRA)
By Joel McClain and Norman Wootan
Without lengthy discussion about the aether, tetrahedral geometric aggregate resonance or the Rule of Nines, it is possible to understand this circuit as basically a tuned magnetic and quartz amplifier.
However, it was necessary to study those subjects in order to design and build the MRA, so if you want to fully realise how it works, avail yourself of the files on KeelyNet which contain all of that and much more.
In the MRA schematic below, there is a tuneable low-power oscillator which supplies a signal to one side of a barium titanite transducer. The opposite side of the transducer is connected to a primary coil which is wrapped around a barium ferrite magnet core. The opposite end of the primary goes back to the oscillator.
A secondary is wrapped around the primary and is connected to an ordinary
bridge rectifier, and the output of the bridge is applied to a DC load.
A filter capacitor can be used on the output of the bridge, and was used
on the MRA which we built. Additionally, a load resistor across the capacitor
will keep the output DC from getting too high as the circuit is tuned.