A thermo-insulation article for a heat absorptive element, e. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0. A replica transconductor-capacitor filter and a phase detector are used to establish any phase shift in an input signal, and a state machine adjusts capacitor arrays in the the replica transconductor-capacitor filter and the at least one transconductor-capacitor filter in order to set a cut-off frequency of the channel select filter. Further a second body having metallic pads facing the respective terminals.