Start circuit for pulse counter frequency drive - has first output pulse as full pulse in time and voltage relationship, so that impulse drive is activated when next full pulse occurs

摘要

The start circuit forms an electronic pulse counter of such design that already the first pulse at the output (d) forms a full pulse in time- and voltage-wise manner. The pulse counter is pref. of special type, contg. a change-over circuit (20). The last flip-flop (x) tilts from negated potential of the respective pulse line in its active position via a preactivated AND-circuit, in which output (d) is at high potential. ADVANTAGE - Precise coincidence of pulse frequency switching with pulse gap for pulse actuation. Standard versions have low number of switching units.