TOUCH_BUTTONS

Published:2009/7/13 4:16:00 Author:May | From:SeekIC

Based on detecting skin resistance between two contacts built into each touch button. Contact going to 0 V would normally be metal front panel of control. Any number of sections like that in dashed lines can be cascaded to handle more buttons. A particular button always comes on when power is applied, and is canceled by next button touched. LED identifies button currently activated; use any LED rated at 20 mA. Supply can be 20 to 30 V. Outputs may be used to drive FET analog switches, varactor tuning diodes, or relays.-P. G. Hinch, Self-Cancelling Touch Button Control, Wireless World, Oct. 1974, p 380.



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