VISUAL_INDICATOR

Published:2009/7/1 22:08:00 Author:May | From:SeekIC

When circuit is activated by high output of burglar alarm circuit, 555 timer operating as very low frequency MVBR makes LED1 flash on and off during alarm condition. Alternate connection of LED1 to V+ holds LED1 on for standby while flashing it during alarm. Oscillator output is also available for other uses if desired. indicator can be located remotely from alarm.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 232-235.



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