10min_ID_TIMER

Published:2009/7/12 21:07:00 Author:May | From:SeekIC

Red pilot lamp comes on at end of timing period, adjustable with R1 from 7 to 11 min, as reminder for amateur radio operatorto makestation identification required by FCC every 10 minutes. Green lamp indicates that timer is on and timing. Lamps should draw no more than 100 mA, to avoid overloading NE555 timer. Any 9-12 VDC supply can be used.-D. Backys, ldentification Timer, Ham Radlio, Nov. 1974, p 60-61.



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