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Browse Prior Art Database

Decoder Driver For Indicator Tube

IP.com Disclosure Number: IPCOM000098293D
Original Publication Date: 1960-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Griffin, JF: AUTHOR

Abstract

This indicator circuitry accepts binary coded decimal information and displays the decimal equivalent.

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Decoder Driver For Indicator Tube

This indicator circuitry accepts binary coded decimal information and displays the decimal equivalent.

The cold cathode indicator glow tube displays the numerals 0 through 9 and is of the type described in U. S. Patent No. 2,906,906. When an ionizing potential is impressed between the anode and any of the cathodes, the tube fires and a glow surrounds the cathode which is numerically shaped. Here, each cathode is controlled by an NPN high voltage transistor. Properly coded signals, applied to the input diode AND circuits, drive the selected transistor into saturation and cause the associated cathode to glow. Incorrect codes cause more than one cathode to glow.

Circuit symmetry allows economical fabrication of the driver on a pair of identical printed circuit boards, the first including decoder outputs 0, 2, 4, 6 and 8, the second decoder outputs 1, 3, 5, 7 and 9.

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