DUAL_POLARITY_START_STOP_CONTROL

Published:2009/7/23 22:40:00 Author:Jessie | From:SeekIC

Switches connect relay coils either to positive bus or to ground, so timer can be controlled by either positive or negative pulses. Additional transistor, used in place of relay, pro vides stop switching.Q3 forms damping cir. cult for use where stop pulse duration is too short.-F. W. Kear, Tests Show Control is Key to Timer Accuracy, Electronics, 33:27, p 62.



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