Abstract: An illuminated sign is for traffic control, in particular for road traffic, and includes light sources for generation of the sign and a monitoring device for functional monitoring of the light source. The light sources are embodied as light diodes and the monitoring device is embodied as a device for the limited current loading of the light diodes. The functional monitoring of said sign can be achieved with reasonable technical requirements in both the deactivated and activated state thereof.

Abstract: An illuminated sign is for traffic control, in particular for road traffic, and includes light sources for generation of the sign and a monitoring device for functional monitoring of the light source. The light sources are embodied as light diodes and the monitoring device is embodied as a device for the limited current loading of the light diodes. The functional monitoring of said sign can be achieved with reasonable technical requirements in both the deactivated and activated state thereof.

Abstract: A speed control circuit provides control acceleration or deceleration with respect to a rate of speed or to standstill and is effected for a DC motor by way of a processor system which is provided with a speed signal proportional to the speed of the DC motor. During the acceleration or deceleration phase, the pulse duration of the speed signal has a path-dependent control criterion assigned thereto. During operation at constant speed, the pulse duration has a control criterion corresponding to a rated speed assigned thereto. Further, a switching device is provided by way of which the value or, respectively, the mean value and the direction of the current through the DC motor can be set on the basis of the control criterion.