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Browse Prior Art Database

Binary Counter Trigger

IP.com Disclosure Number: IPCOM000098554D
Original Publication Date: 1959-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

The conventional binary counter trigger uses the well known Eccles-Jordan circuit. The action of such a trigger is inherently slow when transistors are used. The use of external gating to secure reliable operation at low speeds makes high speed operation more difficult. In the circuit shown, use is made of the emitter follower type trigger. This circuit is inherently faster than the Eccles Jordan circuit which uses the grounded emitter connection. A capacitor from output to point B provides the memory for binary operation. It also provides feedback which effectively gates the set off input. The resistive feedback to point A controls the recovery time of the set on input capacitor. This permits high speed 1000 KC operation without the necessity of external gates.

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Binary Counter Trigger

The conventional binary counter trigger uses the well known Eccles-Jordan circuit. The action of such a trigger is inherently slow when transistors are used. The use of external gating to secure reliable operation at low speeds makes high speed operation more difficult. In the circuit shown, use is made of the emitter follower type trigger. This circuit is inherently faster than the Eccles Jordan circuit which uses the grounded emitter connection. A capacitor from output to point B provides the memory for binary operation. It also provides feedback which effectively gates the set off input. The resistive feedback to point A controls the recovery time of the set on input capacitor. This permits high speed 1000 KC operation without the necessity of external gates. Diode D1 and the PN diode of transistor XR-1 conduct alternately to effectively gate the input pulses by changing the time constants at points A and D.

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