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Transistor Operated Neon Indicator

IP.com Disclosure Number: IPCOM000098567D
Original Publication Date: 1959-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Fitch, CJ: AUTHOR

Abstract

Gas filled diode 17 is connected in parallel with condenser 19 to form a relaxation oscillator 20. Assume that transistor 11 is nonconductive, a fixed potential is applied to terminals 22 and 23 and is thus applied also across diode 17. It is insufficient to fire diode 17. When a signal is applied over line 15 to cause transistor 11 to conduct, the potential at collector 14 assumes virtually the same potential as emitter 12, namely ground, and a voltage drop is then produced across resistor 16. With collector 14 near ground, the potential applied across diode 17 is sufficient to cause it to fire.

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Transistor Operated Neon Indicator

Gas filled diode 17 is connected in parallel with condenser 19 to form a relaxation oscillator 20. Assume that transistor 11 is nonconductive, a fixed potential is applied to terminals 22 and 23 and is thus applied also across diode
17. It is insufficient to fire diode 17. When a signal is applied over line 15 to cause transistor 11 to conduct, the potential at collector 14 assumes virtually the same potential as emitter 12, namely ground, and a voltage drop is then produced across resistor 16. With collector 14 near ground, the potential applied across diode 17 is sufficient to cause it to fire. Condenser 19 then discharges through diode 17 until the potential across the condenser and diode combination drops to the extinguishing potential of diode 17, at which time diode 17 ceases conducting and condenser 19 begins to charge anew to the ignition potential of diode 17.

This process of firing and extinguishing of diode 17 continues until the removal of the signal from line 15 causes transistor 11 to turn off. The voltage drop across resistor 16 is thus removed. The diode 17 then can no longer fire so that the relaxations of the oscillator 20 cease.

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