| 摘要 |
<p>852,029. Circuits employing bi-stable magnetic elements. COLLINS RADIO CO. Jan. 14, 1957 [May 24, 1956], No. 1390/57. Class 40 (9). [Also in Group XL (b)] A delay line for distributing pulses comprises a ladder network having a number of identical sections each consisting of a capacitor 36, an output transformer 41 and an inductor 21 having a core 16 (made e.g. of ferrite) which has a rectangular hysteresis characteristic. Upon closure of switch 73 current flows in the first section." Since the initial permeability of the core 16 is high, the reactance of the inductor is high and the build-up of voltage on the capacitor 36 is slow. After an interval, the core becomes saturated and the reactance of the inductor suddenly drops, causing a pulse of charging current which is applied through the transformer 41 to a first output circuit 46. The full voltage of the source is then applied to the second section, then to the third, and so on until a sequence of pulses has been distributed to all the output circuits 46 to 50. The last output circuit is' coupled to the grid of a triode 52 whereby the last pulse may be amplified and applied to the winding 76 of a normally open relay 51..Closure of relay contacts 64 to 70 short-circuits the capacitors of the delay line sections and applies an A.C. demagnetizing voltage from a source 71 to windings 26 on the cores 16. Alternatively, the A.C. voltage may be applied to the windings 21. Control switch 73 may consist of a pair of normally closed contacts opened by relay 51 whereby the circuit becomes automatically repetitive. The interval between operations may be determined by a time-delay device incorporated in the grid circuit of the triode 52. Rectifiers 31 are used to damp oscillations which may occur during formation of pulses. Specification 830,448 is referred to.</p> |
