Abstract: A low-noise character element display device is obtained by periodically gradually switching on and off of the display elements and by changing the information to be displaced at instants that the display elements are off.

Abstract: In a television receiver having a synchronous video signal detector from which a signal is obtained for controlling a function such as an automatic volume control or a synchronization signal separation, a correction signal, obtained by means of full-wave rectification from a frequency deviation detector, is added to the signal to improve the operation of said function of the receiver in the case of more serious detuning.

Abstract: A flash array has at least two combustion flash lamps and an indicator which indicates whether a lamp has or has not flashed. The indicator consists mainly of a melting strip which is constructed as a radiation-sensitive switch contact and which is part of the electric circuit of the flash array.

Abstract: A method of manufacturing a semiconductor device, in particular a device having two complementary insulated gate field effect transistors, in which an aperture is provided in a masking layer and in said aperture a zone is diffused in the body from a highly doped layer, in particular a phosphorus glass layer. According to the invention, a thermal oxide layer is formed in the aperture in a first heating step during the diffusion, after which the doping layer is removed without using a mask and while maintaining the thermal oxide layer, and the dopant is then further diffused in a second heating step. The thermal oxide layer serves as a partial masking against the diffusion, as an etchant stopper and in many cases also as a mask against ion implantation.