Abstract: A method and apparatus for producing a high frequency rotating magnetic field, in particular for domain transport stores, utilizes a rectangular pulse sequence which is fed into two parallel connected flip-flops, one of the flip-flops having an inverter connected serially in front, effecting flip-flop output signals which are phase shifted by 90.degree. which are fed via a terminal stage into respective coils of a Helmholtz coil pair, each of which coils are supplemented with capacitors to form resonant circuits.

Abstract: The invention relates to an arrangement for generating a magnetic supporting field for a magnetic cylindrical domain store, having a soft-magnetic plate matrix comprising at least two plane plates arranged parallel to each other at an interval, and having two bar-shaped permanent magnets situated between said plates and arranged at an interval, wherein said permanent magnets have their respective longitudinal middle axes parallel to each other and are magnetized perpendicularly thereto, and wherein at least one of which is rotatable about its longitudinal middle axis.

Abstract: An arrangement for the production of a magnetic rotary field with the help of a crossed coil pair of separate capacitance connected across each of said coils to form respective parallel resonant circuits each of which is in series with a timing circuit, a controllable voltage source and a resonant circuit switch. A timing pulse succession is fed into a program generator which supplies two 90.degree. phase shifted groups of pulses respectively consisting of starting pulses, stopping pulses, and operational pulse successions. A first switching stage is controlled in each group by the starting and stopping pulses. The first switching stage is connected ahead of the resonant circuit in series with a controllable voltage source.

Abstract: An arrangement for rapidly switching a high frequency magnetic field includes parallel resonant circuits which are supplied with sine or cosine current, respectively, comprise coils which are arranged cross-wise in respect of each other and a switching member is connected parallel to each coil. The switching member comprises a controllable voltage source which is connected by way of an RC circuit to an end of the resonant circuit, and a transistor is connected between the other end of the resonant circuit and a reference potential.