UP_TO_SPEED_LOGIC

Published:2009/7/7 3:26:00 Author:May | From:SeekIC

Simple speed-sensing circuit fed by tachometer pulses makes READY output high when rotating device reaches desired minimum or threshold speed. Single-action triggering eliminates instability at decisionpoint. Circuit also provides hysteresis, for separating pull-in and drop-out points any desired amount as determined by ratio of R1 to R2 in timing network. Article covers circuit operation and gives timing diagram.-W. Bleher, Circuit Indicates Logic Ready, EDN Magazine, March 5, 1974, p 72 and 74.



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