TOUCH_SWITCH_FOR_MUSIC_KEYBOARD

Published:2009/7/13 4:46:00 Author:May | From:SeekIC

Touching metal sensor plate adds about 300pF of capacitance between plate and ground,changing RC delay network that slows down clock waveform reaehing -D input of 4013 dual D flip-flop, making flip-flop output high for duration of contact. Circuit is repeated for each key in electronic music system.-D. Lancaster, CMOS Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 278-282.



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