GB1006172A - Improvements in or relating to controllable pulse repeaters - Google Patents

Abstract

1,006,172. Transistor pulse circuits; circuits employing bi-stable magnetic cores. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Feb. 14, 1964 [Feb. 18, 1963], No. 6290/64. Headings H3B and H3T. The output winding of a bi-stable magnetic core is connected in the emitter-collector path of a transistor of a monostable circuit such that, unless inhibiting means are rendered operative, a pulse on an input winding switches the core in one direction and the resulting pulse in the output winding causes the transistor to conduct and return the core to its original state. If core K 1 is in its N state a pulse of one polarity on line PL has no effect on the core but if it is in the P state it will be switched to its N state. This will produce a pulse in winding W 13 which will cause a transistor blocking oscillator to produce a pulse of emitter collector current and this is in such a direction as to return the core to its P state. An output pulse is accordingly produced in the output winding of transformer TR 1 or in a winding on core K 1 or in a load in series with the collector or emitter circuit. The core may be set to remain in the N state and has to be unresponsive to pulses PL by rendering the transistor non-conducting during one of the PL pulses as by applying a simultaneous blocking pulse to diode G 21 or by interrupting the emittercollector current circuit. It may be returned to the P state by closing a switch S to send a current pulse through winding W 11 or by applying a pulse through G 11 to the base of T 1 to cause the transistor to conduct. Alternatively, if the transistor T 2 is rendered conductive its collector current sets the core of the first to the unresponsive N state, the voltage across the common emitter resistor Z 1 serving to prevent transistor T 1 from conducting and resetting the core.