Electronic Door Release

Published:2012/11/29 0:25:00 Author:muriel | Keyword: Electronic Door Release | From:SeekIC

The IC is a quad 2 input AND gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key,say one of the two non-numeric symbols.



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