U.S. Philips Corporation

Gerd Schiefer

Hubert C Raets

Jan Zwier

Wilhelmus A Zwijsen

Theo Husgen

Klaus Lohn

Georg Lutteke

Paulus Petrus Groenewegen

Lammert Bruntink

Hans Viktor Weinerth

Karel Petrus Rooij

The invention relates to an electric arrangement for operating a an electric discharge lamp (13) which is connected in series with a coil (14) and a switch (15) to a pulsatory direct voltage source. The combination of the lamp and the coil is shunted by a rectifier. The lamp is shunted by a capacitor (18) and the switch is periodically rendered conductive at an instant when the instantaneous voltage of the pulsatory direct voltage source is between 0.5 and 0.8 times the then required re-ignition voltage of the lamp. The voltage build up across the capacitor (18) after the switch has become conducting causes the lamp to reignite. The luminous efficacy of the lamp is comparatively high.

Electric circuit with transient voltage doubling for improved operation

The IC television tuner has a tunable oscillator and a fixed oscillator, two mixer stages and a filter in between. This tuner operates at two intermediate frequencies the first of which lies in the GHz range. The two oscillators are coupled through hybrid rings.

Tunable high frequency input circuit for a television receiver that

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Aachen, Germany

Gerd Schiefer