Abstract:
For energizing an inductive load with a maximum current of brief duration followed by a steady current, less than the maximum, the inductive load is initially connected, by means of an amplifier switch, across a voltage source of relatively high-output voltage and subsequently connected, by means of another amplifier switch, across a voltage source of relatively low-output voltage. Trigger circuitry is operable to apply an input pulse of predetermined duration to the amplifier switch associated with the voltage source of high-output voltage and simultaneously trigger a delay circuit arranged to apply an input voltage to the amplifier switch associated with the source of low voltage. Respective diodes connect a common point the outputs of the respective amplifier switches, the common point and a point at a reference potential provide respective first and second connections to the inductive load.
Abstract:
Circuitry used in detecting a data signal on an electric transmission line includes a detector with a charge capacitor and a circuit comprising a diode, resistors and an auxiliary capacitor. Upon the appearance of a data signal at the input of the detector, the circuitry generates a delayed triggering signal at its output due to the parallel connection of the charge and auxiliary capacitors and the resulting large time constant of the circuitry. When the data signal ceases to appear, the diode becomes reverse biased by the charge having been stored on the auxiliary capacitor, and since the time constant of the circuitry is thereby made smaller, the provision of the triggering signal is rapidly ended.
Abstract:
For energizing an inductive load with a maximum current of brief duration followed by a steady current, less than the maximum, the inductive load is initially connected, by means of an amplifier switch, across a voltage source of relatively high-output voltage and subsequently connected, by means of another amplifier switch, across a voltage source of relatively low-output voltage. Trigger circuitry is operable to apply an input pulse of predetermined duration to the amplifier switch associated with the voltage source of high-output voltage and simultaneously trigger a delay circuit arranged to apply an input voltage to the amplifier switch associated with the source of low voltage. Respective diodes connect a common point the outputs of the respective amplifier switches, the common point and a point at a reference potential provide respective first and second connections to the inductive load.
Abstract:
Device for automatically correcting a code, forming an improvement to a device which combines, in a single unit, means for perforating a paper tape which moves step-by-step, and for reading the code which has just been perforated during the preceding step, this improvement consisting of automatically correcting any code which has been erroneously perforated by causing the tape to step back to the location of the error and either correcting the error or voiding and re-perforating the code at a new location.
Abstract:
Circuitry used in detecting a data signal on an electric transmission line includes a detector with a charge capacitor and a circuit comprising a diode, resistors and an auxiliary capacitor. Upon the appearance of a data signal at the input of the detector, the circuitry generates a delayed triggering signal at its output due to the parallel connection of the charge and auxiliary capacitors and the resulting large time constant of the circuitry. When the data signal ceases to appear, the diode becomes reverse biased by the charge having been stored on the auxiliary capacitor, and since the time constant of the circuitry is thereby made smaller, the provision of the triggering signal is rapidly ended.