counting circuit with thyristors for count of pulses and for switching on of the load current because of, in particular for coupling relay in telephone exchanges

摘要

Thyristors are arranged in an even and an odd thyristor groups and the operational states of the thyristors are monitored by transistors. When a pulse is received at a timing input connected to the thyristors through a pulse distributor and ignition multiples individually allocated to the thyristor groups, a distributor applies the pulses to the one or the other multiple in accordance with the counting circuit state, so that an even or an odd thyristor is ignited. After a thyristor is ignited, the preceding thyristor is extinguished. Load current circuits are connected through cathodes and/or anodes and decoupling diodes and currents in the one or the other direction.