1_h_HOUSEHOLD_TIMER

Published:2009/7/12 23:43:00 Author:May | From:SeekIC

NE555 timer circuit turns off television set or other device at any desired time up to about 1 h after start switch is closed. Use IRC MR312C relay having coil resistance of 212 ohms, or other 12-V relay drawing less than 200 mA. With values shown, R2 gives time delay range of 3 to 58 min. For other ranges, change values of R2 and C1. Clockwise from top, pins on NE555 are 8,3, 4, 2, 1, 7, and 6.-P. C. Walton, Build This $5 Timer, 73 Magazine, Jan. 1976, p 129.



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