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Neon Lamp Bidirectional Counter

IP.com Disclosure Number: IPCOM000094565D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Nassimbene, EG: AUTHOR

Abstract

This is a bidirectional counter employing three-element neon tubes. The neon tubes are connected so that a fired neon conditions both the preceding tube and the following tube for conduction upon application of the next input pulse. One pulse input line 10 is provided for forward count. Another input line 12 is for a backward count.

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Neon Lamp Bidirectional Counter

This is a bidirectional counter employing three-element neon tubes. The neon tubes are connected so that a fired neon conditions both the preceding tube and the following tube for conduction upon application of the next input pulse. One pulse input line 10 is provided for forward count. Another input line 12 is for a backward count.

Each lamp is biased to 75 volts by resistors 20 and 22. When lamp 2 is on, the current flow through resistor 30 establishes a voltage of 70 volts at the base of the lamp, making the voltage at Point A 70 volts. When a 70 volt input pulse is received on line 12 and transmitted by capacitor 40, Point A is raised to 140 volts. This voltage is transmitted by diode 50, causing lamp 1 to ignite. The current then flowing across resistor 32 produces a pulse through reset capacitors 60 and 62, causing lamp 2 to be extinguished.

When lamp 1 is on, it conditions lamp 0 to 70 volts at Point B and also conditions lamp 2 to 70 volts at Point C. Thus, a pulse on line 10 causes lamp 2 to fire. A pulse on line 12 causes lamp 0 to fire.

Since the register is connected in a continuous ring fashion, a carry pulse is generated when a lamp at one end is ignited and the lamp at the other end is extinguished.

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