Diehl Gmbh & Co.

Diehl Ako Stiftung & Co. Kg

Diehl Stiftung & Co.

Henry Fluhrer

Erwin Potthof

Alfred Meisner

There is proposed a circuit arrangement for the actuation of a VFD, LED or LCD display, which has at least two control blocks for producing control signals for the various kinds of display, wherein the control signals of the control blocks are processed by a common driver component and the driver component transmits suitable actuation signals to the terminals of the VFD, LED or LCD display.

Circuit arrangement for actuating a display

Provided is to an ultrasound sensor for a fumes extractor hood, wherein the sensor monitors the vapor rising from the cooking to the extractor hood. Automatic compensation in respect of temperature and ageing drift of the sensor is effected. For that purpose checking of the resonance frequency is implemented cyclically during on-going operation of the sensor, in which case a shift in the resonance frequency is recognized, and the new resonance frequency is established by a statistical calculation method and used for further operation of the sensor.

Ultrasound sensor for a fumes extractor hood

A circuit arrangement for the control of a ventilator, especially for a stream or vapor vent hood which is located above a cooking range, in dependence upon steam or vapor clouds which are drawn towards the ventilator. An ultrasonic transmission path having an ultrasonic transmitter and an ultrasonic receiver is located in front of the ventilator, with a receiving circuit demodulating the signal which appears at the ultrasonic receiver; wherein an evaluating or sample-and-hold circuit evaluates any fluctuations in the input signal encountered over a period of time and which are based on the presence of steam or vapor clouds in the ultrasonic transmitting path, and counts these signals within a time frame, and wherein a comparator circuit compares the result of the count with preset values and, in accordance therewith, activates the ventilator.

Circuit arrangement for the control of a ventilator

An electronic acoustic signal emitter which includes a piezo-ceramic plate on a metal membrane, and with a circuit board which supports the electronic components. A ring-shaped conductive path with a diameter which is generally as equally large as the metal membrane is arranged on the circuit board in addition to the conductive paths for the components and is electrically connected therewith, which serves as a conductive path and carrier for the metal membrane.

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Nuremberg, Germany

Henry Fluhrer