555 touch mode 10 stages volume automatic regulator circuit

Published:2011/6/16 2:01:00 Author:TaoXi | Keyword: 555, touch mode, 10 stages, volume, automatic regulator | From:SeekIC

As the figure 14-24 shows, the touch regulator is composed of the touch switch, the controllable time base pulse generator, the counting circuit and the volume control circuit, this touch regulator can be used to touching control the volume. The touch switch is composed of the VT1, VT2, VT3 and the resistance capacitance components. When the hand touches the sheetmetal T, the induced voltage is amplified by VT1, then it is rectified and filted by D1 and C1, the DC voltage conducts the VT2, and the VT3 cuts off, the reset port of IC1(555) has the high electrical level, the multivibrator which is composed of the 555 and R7，R8，C2 starts working to output the oscillation pulse. T=0.693(R7+2R8)C2, the cycle of the figure parameter is about 3 seconds. The output pulse of 555 can be used as the count clock CP of the IC2(CD4017). The CD4017 is the decimal counter / pulse distributor.



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