Siemens Aktiengesellschaft

Harald Strohmaier

Joseph Sauer

Carsten Braun

Ronald Stempel

Harald Kapp

A drive circuit for an electromagnetic relay having a relay coil and switch contacts, includes a first switching device between a first coil terminal and a first voltage source, a second switching device between a second coil terminal and a zero potential, and a control device producing a current through the coil closing both switching devices. To provide the shortest possible response time and simple and cost-effective construction, a second voltage source is connected through a third switching device to the first coil terminal. The third switching device is connected in parallel with the first switching device, the second voltage source has a higher voltage level than the first voltage source and the control device produces a current through the coil, initially closing all three switching devices and following expiration of a predefined period, opening the third switching device again and keep the first and second switching devices closed.

Drive circuit for an electromagnetic relay

A miniature hearing aid to be worn at the head together with a corresponding manufacturing method are particularly proposed, this hearing aid being distinguished by a miniaturized amplifier unit that is simple to manufacture. A highly shrinkable glue and/or a film that can be sucked on by under-pressure, thereby fixes the electrical components against a carrier part and also holds them against the contacting locations under contacting pressure.

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Falkensee, Germany

Harald Strohmaier