Generation of oscillations by methods not covered by groups , including modification of the waveform to produce sinusoidal oscillations

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Analogue function generators for performing computing operations Generation of oscillations using amplifier with regenerative feedback from output to input Generation of oscillations using active element having a negative resistance between two of its electrodes Generation of oscillations using transit-time effects Generation of oscillations using a shock-excited tuned circuit Generation of oscillations using deflection of electron beam in a cathode-ray tube Generation of oscillations using galvano-magnetic devices, e.g. Hall-effect devices, or using super-conductivity effects Generation of oscillations using radiation source and detector Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source Generation of oscillations by combining unmodulated signals of different frequencies Generation of oscillations periodically swept over a predetermined frequency range Simultaneous generation by a free-running oscillator of oscillations having different frequencies Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs