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Lost Impulse Detector

IP.com Disclosure Number: IPCOM000094463D
Original Publication Date: 1965-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Ford, WG: AUTHOR

Abstract

This circuit monitors a signal at successive stages of a pulse handling device and identifies a stage that fails to produce a pulse. The circuit locates intermittently faulty stages of a computer.

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Lost Impulse Detector

This circuit monitors a signal at successive stages of a pulse handling device and identifies a stage that fails to produce a pulse. The circuit locates intermittently faulty stages of a computer.

During each normal operating cycle of the monitored device this circuit receives pulses successively at inputs IN 1, IN 2 and IN 3. A circuit for each input terminal turns on an indicating light I1, I2, I3. At the end of an operating cycle, a pulse appears at a reset input. Associated circuits turn off the indicating lights to condition the circuit for the next operating cycle. When a pulse is missing at a stage of the monitored device, the corresponding light is not turned on. The circuit controlling each light includes a semiconductor memory device 1, 2, 3 of the type that turns on and off in response to pulses at a gate terminal. Each such device has its gate terminal connected to receive a pulse at a gain adjusting potentiometer R1, R2 and R3. Also, each has its cathode terminal connected to produce a pulse signifying voltage across a resistor R5, R6 and R7. A transistor T1, T2 and T3 is connected by a resistor R9, R10 and R11 to respond to the voltage across R5, R6 and R7 to turn on the light in its collector circuit. The memory device can be bypassed by a switch Sl, S2 and S3 when the associated input is not used.

The circuit also responds to a missing pulse at any input terminal to energize a relay RLY 1 to stop the monitored device. A semic...