MODEL_RAILROAD_SWITCHING_

Published:2009/7/7 5:05:00 Author:May | From:SeekIC

Control circuitis used to drive solenoid-operated track Switches oftγpical HO train layout Inputcan be ρair of comρlementary TTL signals from 8008 orother computer or can be from manual switch s1. 74121 mono MVBR controls time that witch is energized in given direction. Outputcult transistors are rated at 20 W,enough for driving solenoids taking 1 A at 12 V Use protective diodes across coils of solenoids,-H,De Monstoy,Model Railroad Switch Control Circuit,BYTE,Oct .1975,p 87.



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