TOUCH_CONTROLLED_RELAY

Published:2009/7/13 4:17:00 Author:May | From:SeekIC

Basic circuit uses Signetics 555 timer to make LED flash each time input is touched with finger. Replace LED with flip-flop (any type) and three sections of 8T90 hex power inverter to drive DC relay. Silicon diode suppresses voltage spikes generated when magnetic field of relay collapses. Use only as many paralleled sections of inverter as are required to operate relay. Input can be brass or copper plate at least 2 inches square.-G.Young, Voltage, Current, and Power Supplies, Kilobaud, Nov. 1977, p 76-78 and 80-82.



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