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Bistable Neon Photoconductor Circuit

IP.com Disclosure Number: IPCOM000097432D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Myers, JL: AUTHOR

Abstract

Bistable Ne-PC operation in response to pulsing is afforded with a single commutating capacitor 10. Initially, as energizing potential is first applied, both neon lamps 11 and 12 and all photoconductors (PC's) 13, 15, 16 and 18 are in the dark or high impedance state. Series resistors 25 and 26 determine the current flowing through lamps 11 and 12.

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Bistable Neon Photoconductor Circuit

Bistable Ne-PC operation in response to pulsing is afforded with a single commutating capacitor 10. Initially, as energizing potential is first applied, both neon lamps 11 and 12 and all photoconductors (PC's) 13, 15, 16 and 18 are in the dark or high impedance state. Series resistors 25 and 26 determine the current flowing through lamps 11 and 12.

Lamp 11 is initially rendered conducting upon starting capacitor 27 attaining sufficient charge through resistors 21 and 25.

Lamp 11 is latched by associated PC 13 and capacitor 27 discharges through the shunt resistor 29. This has sufficiently low resistance to discharge 27. It is high enough not to affect the operation of PC's 13 and . 15. During this time the commutating capacitor 10 charges through resistor 26 and lamp 11, which is in a low impedance state. Lamp 12 does not conduct because of the high resistance state of the associated PC's 16 and 18.

Triggering pulses are applied to neon lamp 30 which excites both PC's 15 and 16. The resistance of PC 16 associated with lamp 12 drops, allowing the latter to conduct and latch through the associated PC 18. At the same time, capacitor 10 is discharged through lamp 12. It is charged in the opposite direction through lamp 11 by way of the the series resistor 25, applying a reverse voltage to lamp 11 dropping the potential across it and, thus, extinguishing it. The resistance of PC 13 rises to prevent lamp 11 from reigniting. Upon the...