Arrangement for digital brightness control of lamps

An arrangement for digital brightness control of lamps in control channels, particularly for use in planetaria illuminations, comprising

• at least one lamp,
• at least one power control stage for brightness control of said lamp in digitally divided steps of a brightness raster,
• at least one programmable counter having a counter input, a set input and an output,
• at least a bistable flip-flop having two inputs and one output,
• at least a gate circuit having two inputs and one output,
• said lamp, said power control stage, said counter, said flip-flop and said gate circuit constituting one of said control channels,
• said output of said flip-flop being connected to one of said two inputs of said gate circuit and to said input of said power control stage,
• said output of said power control stage being connected to said lamp,
• said gate circuit output being connected to said counter input, said counter output being connected to one of said two flip-flop inputs,
• said counter being programmable via said set input,
• a mains synchronizing stage having two inputs and one output,
• said synchronizing stage being for producing mains synchronous pulses,
• said output of said synchronizing stage being connected to the other of said two flip-flop inputs,
• a voltage source being connected to the one of said two inputs of said synchronizing stage,
• a pulse generator being connected to the other of said two inputs of said synchronizing stage and to the other of said two inputs of said gate circuit,
• said pulse generator being for producing a pulse sequence frequency corresponding to the frequency of the mains synchronous pulses divided by steps determined by the bit number of said brightness raster.