The electronic circuit includes, in an automatic gain control loop, an input amplifier, an AGC unit connected to the amplifier output to detect the amplitude of an output signal and a unit for attenuating an input signal of the amplifier based on an adaptation signal from the AGC unit. In one embodiment, such a method includes writing a data set to tape, the data set comprising S sub data sets of fixed size, each sub data set comprising N code word interleaves. The clock helps a child to learn concepts of time by providing them with an identifiable visual image to illustrate the continuous passage of time.