Large time constant steering circuit for slowly changing a voltage on a node between at least two discrete voltage levels, the circuit comprising an input node for receiving an input voltage, an output node for presenting an output voltage, a capacitive part connected at said output node for providing said output voltage and a resistive part connected between said input and output nodes for conducting a charging current from said input node to said capacitive part or a discharging current from said capacitive part to said input node depending on said input voltage. The resistive part comprises a semiconductor structure connectable between said input node and said capacitive part in such a way that the semiconductor structure remains in an off state irrespective of the input and output voltages and passes only leakage currents for charging or discharging said capacitive part.
