On the Frequency Doubler

Abstract

The writer treats herein of the frequency doubling devices.
Vellauri and Joly utilized very successfully the wave distortion of two highly saturated transformers.
Zenneck and Jonas, on the other hand, employed the current rectifying apparatus.
These methods may all be considered to rely upon a single and the same underlying principle, that, when the magnetic flux through a coil undergoes the change of a half wave of a sinusoidal curve, lasting only for that half period, a complete wave of current of nearly double frequency may flow through the coil circuit.
The writer shows that Zenneck's method by means of rectifiers can be greatly improved by means of D.C. magnetization applied in the opposite direction to the magnetization of the rectified current. The also treats experimentally with the direct method of deriving alternating currents of higher harmonics from a sinusoidal current source.
The experiments are made at 50 cycles per second.
This report includes the following topics:
I. Introduction.
II. Frequency doubler by means of rectifiers with D.C. magnetization.
III. Direct method of obtaining an alternating current of double frequency.
IV. Conclusions.