| 摘要 |
<p>1,037,257. Transistor circuits for eliminating contact bounce effects; telegraphy. WESTERN ELECTRIC CO. Inc. July 25, 1963 [Aug. 30, 1962], No. 29438/63. Headings H3T and H4P. The effect of bounce of a contact connecting a source to a load is suppressed by discharging a condenser through the load when the contact is opened, the discharge being terminated at a predetermined point so that, for example, the current is sustained during the bounce but is not unduly prolonged when the contact is opened. When the teleprinter contact 2 of a frequency shift system is closed the load 1 is energized and a capacitor 8 connected to a point between the contact and the load is rapidly charged through a transistor 6. If the contact bounces the load current is maintained by discharge of the condenser. The contact is opened at the end of the signal but the current in the load is not unduly prolonged because, when the condenser has discharged to a point determined by the potentiometer 4, 5 connected across the source, the transistor cuts off and the discharge ceases.</p> |
