Patent
Oscillator/driver circuit for fluxgate magnetometer
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TLDR
In this paper, a low power expenditure oscillator/driver circuit including a transistor drive and control windings connected to a magnetic core suitable for use in a fluxgate magnetometer is disclosed.Abstract:
A low power expenditure oscillator/driver circuit including a transistor drive and control windings connected thereto and being operatively wound on a magnetic core suitable for use in a fluxgate magnetometer is disclosed. Its low power expenditure feature is provided, inter alia, by including an additional resistor in the base circuit of the transistor portion thereof so as to lengthen the base current pulses which permits their termination to be controlled by saturation of the magnetic core.read more
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References
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Patent
Magnetic field gradiometer utilizing a pair of cores driven by a blocking oscillator
TL;DR: In this paper, the authors present a demodulator circuit to cancel out the induced drive signals and only the difference in ambient fields between the two ring cores is passed, indicative of the gradient in the DC magnetic field.
Patent
Blocking oscillator with extended variable pulse
TL;DR: In a blocking oscillator circuit, a unidirectional device such as a diode, in series with a selectively valued resistor is coupled between the input terminals of the active amplifier element, such as between the emitter and base of a transistor as discussed by the authors.