ELECTRONIC_LOCK

Published:2009/7/14 22:06:00 Author:Jessie | From:SeekIC

Correct combination of switches S1-S5 must be actuated to energize relay in series with ignition switch of auto or any other type of electric lock. If wrong combination is used, lock cannot be opened until resetting combination is entered，When car ignition is turned off, ignition relay should be reset (contact opened) by pressing S6．With connections shown, switches S2,S4,andS5 must be depressed simultaneously to oρen (set) lock. If error is made, output of fault gate goes to logic 1 and contacts of relay 2 will open, After error, S1 and S3 must be depressed simultaneously to reset lock before opening combination can be used again. Switches can be connected for any other desired combinations.-L. F. Caso, Electronic Combination Lock Offers Double Protection, Electronic, June 27, 1974, ρ 110； reprinted in ″Circuits for Electronics Engineers,″Electronics,1977, p 346.



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