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Gas Tube Counter Circuit

IP.com Disclosure Number: IPCOM000098879D
Original Publication Date: 1958-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Buley, TL: AUTHOR [+2]

Abstract

There is shown a single order of a parallel entry type counter circuit using commercially available glow transfer tubes. A single positive pulse or series of positive pulses effects a corresponding number of steps of counter advance or decrease. The direction of advance depends upon whether a positive or negative counter entry is desired.

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Gas Tube Counter Circuit

There is shown a single order of a parallel entry type counter circuit using commercially available glow transfer tubes. A single positive pulse or series of positive pulses effects a corresponding number of steps of counter advance or decrease. The direction of advance depends upon whether a positive or negative counter entry is desired.

The counting tube is a cold cathode gas tube having one anode surrounded by 30 cathodes. Ten cathodes are defined as digit cathodes, while each of two other sets of ten electrically commoned cathodes are defined as guide cathodes.

Assume, for example, the glow to be between the 8 digit cathode and the anode so that the digit eight is represented. A positive entry pulse on the input line supplies a positive level to all digit cathodes and a positive pulse to one set of guide cathodes G1 through an associated RC circuit if a negative entry is desired, or to the other set G2 through an associated RC circuit if a positive entry is desired. The set of cathodes G1 or G2 receiving the pulse is determined by the state of a + or entry relay.

With the digit cathodes raised in potential and assuming a desired positive entry so that the positive pulse is routed to the G2 cathodes, the glow will transfer from the 8 digit cathode to the, more negative adjacent G1 cathode. Current flow from G1 to anode will raise the G1 potential. The coupling condenser on the G2 circuit will drain the plus potential from the G2 cathode. At a certain point, the falling G2 potential will bec...