Abstract: In a circuit arrangement for adjusting a pulse frequency of a quartz-controlled clock or watch there are present a pulse generator, a multi-stage frequency divider arranged behind said pulse generator and in front of a counter, as well as adjustable means for adding clock pulses in front of at least one predeterminable frequency divider stage during a counting cycle, and adjustable means for subtracting a clock pulse between a frequency divider stage of higher frequency and a frequency divider stage of lower frequency in a counting cycle. The higher-frequency frequency divider stages are developed as fixed, pre-settable counters, and between the pre-settable counter and the next following frequency divider stage the adjustable means for subtracting a clock pulse are arranged. In this way the current consumption of the circuit arrangement can be kept small since its elements oscillate only with a relatively low frequency.

Abstract: A indicator device with vacuum fluorescence elements controlled or triggered by a driving circuit, the heaters of the elements lying in a heating circuit. The heating circuit contains a switch which is controlled or triggered by a clock generator and the clock pulse frequency and the pulse duty factor of the control signal pulses are selected such that the effective value of the pulsed heating current is equal or approximately equal to the dc heating current in accordance with the elements.