The frequence stability or precision of a clock circuit (TC) is improved by the fact that the clock pulse signal (tts) produced is synchronized with the aid of a phase-locking loop with a pulse signal (ts) derived from a network pulse signal (nts). Targeted electricity supply of parts of the clock circuit (TCO) by a high capacity capacitor (SC) can avoid considerable energy supply down times. Clock circuit (TC) is intended in particular for low-cost switching systems .
