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Core Indicator Circuit

IP.com Disclosure Number: IPCOM000098896D
Original Publication Date: 1958-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Wolff, HP: AUTHOR

Abstract

This core state indicating circuit is adapted for use where the core switching pulses are too short to effect ignition or extinguishing of a neon lamp.

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Core Indicator Circuit

This core state indicating circuit is adapted for use where the core switching pulses are too short to effect ignition or extinguishing of a neon lamp.

The lamp is biased by a DC voltage source at a voltage level between its ionization and de-ionization voltages. A pulse applied to the core Input winding switches the core to the 1 state. As the core switches, a current pulse flows from the W(1) winding and through diode D(1) charging condenser C(1) and raising the voltage across the lamp to a level above its ignition voltage. The R(1) C(1) time constant maintains this voltage for a sufficient time interval after the termination of the W(1) current pulse to allow the lamp to ignite.

A pulse applied to the Reset winding switches the core to the O state. As the core switches a current pulse flows from the W(2) winding and through diode D(2), charging condenser C(2) and lowering the voltage across the lamp to a level causing it to extinguish. The R(2) C(2) time constant maintains this voltage for sufficient time interval after the termination of the W(2) current pulse to allow the lamp to de-ionize.

When the polarities are as shown, the On Side resistance R(1) may be omitted and C(1) will discharge through the lamp when it ignites.

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