555 eight stages touch volume controller circuit

Published:2011/6/16 1:32:00 Author:TaoXi | Keyword: 555, eight stages, touch, volume controller | From:SeekIC

As the figure 14-25 shows, the controller is composed of the square wave generator, the shift register circuit, the touch control circuit and the impedance converting circuit, this controller can be used in the touch volume control, and it displays the volume by the LED light beam. The astable multivibrator is composed of the IC1 (555) and R18, R19, C2, f=1.44/(R18+2R19)C2, it is about 2Hz. The output of it can be used as the shift clock pulse of the IC2 and IC3. The IC2 and IC3 use the two-way shift register 74194. The Q0-Q7 have the low electrical level, the circuit is in the keep state, the volume is minimum. When the hand touches the sheetmetal A, S0 has the high electrical level, IC2 and IC3 change into the serial right shift, the LED0-LED7 turns on one by one.



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