Use KD-9300 to make a voice-activated and touch-controlled delay light

The sound-activated and touch-controlled delayed light circuit made with KD
-9300 is shown in Figure 3-31. The right part of the dotted line in the figure is the ordinary lighting circuit, and the left part is the controller. It can be seen from the circle that this controller only has two external connections, which can be directly connected in parallel to both
ends of an ordinary switch to transform the lighting into voice control and touch control.
    VDl~VD4 and vs form the main circuit of the light switch. The collector block A and transistors VTI-VT3 form
the control circuit of the delay switch. R6, VD6 and C2 form a simple resistor step-down voltage stabilizing circuit with an output of about 3.9V. DC voltage is used to
power the control circuit. In the static state, the base of vr2 has no bias current and is in a cut-off state. Music integrated circuit A does not
work without trigger voltage, VT3 is also in a cut-off state, vs is turned off, and the lamp H does not light up. When you need to turn on the light, you just clap your palm, and the piezoelectric ceramic
piece B picks up the sound wave signal and outputs the corresponding electrical signal. It is amplified by VT1 and coupled to the base of VT2 by CI. The positive half cycle of the
signal makes vn conduct instantly. A positive pulse signal is obtained on the resistor R4, and the music integrated circuit A is triggered to work
. Its output terminal O/P outputs a music signal about 20s long and directly injects it into the base of VT3, causing VI3 to conduct, and
the music signal After being smoothed by R5 and C3, it is added to the gate of the thyristor vs, so that vs is turned on and the lamp H lights up. When vs
is turned on, the voltage at both ends of C2 will drop to about 2V, but it can still maintain the operation of the music integrated circuit. The music signal
will terminate after 20s. VT3 is cut off, and VS loses the contact current. When the alternating current crosses zero, it is turned off and the light H goes out.
    M is the touch electrode piece. When a human hand touches it, the alternating current leaked from the human body is injected into the base of VI2 through the high-resistance resistor R3
, which can also turn on VT2, and the music integrated circuit A is triggered to work, so if you touch the electrode piece M with your finger, It can also
light up the electric lamp H for 20 seconds.