KEYEB_WITH_IP_CONTROL

Published:2009/7/11 3:51:00 Author:May | From:SeekIC

Provides automatic control of TR relay for break-in operation,74221 TTL retriggerable mono MVBR forms dots or dashes with paddle selecting side of IC that puts out pulse．Half of A2(74123 dual retriggerable mono MVBR with clear)makesspaces between dots or dashes Remaining half of A2 acts with A3b and A3c as TR switch.-B,Voight,The TTL One Shot,73 Magazine．Feb,1977,p 56-58.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/KEYEB_WITH_IP_CONTROL.html

Print this Page | Comments | Reading(3)