Use NE555 to create touch and voice-controlled dual-function delay lights

The circuit of using NE555 to make a touch and voice-controlled dual-function delay light is shown in Figure 3-11.
    SCR vs. the main circuit that forms the lamp H. Whether vs is turned on or not depends on the level of pin 3 of time base circuit A.
The time base circuit is connected as a typical monostable trigger. When it is in a stable state, pin 3 outputs low level, vs is blocked, and the lamp H
does not light up.
    When you need to turn on the light, you can clap your palms. The piezoelectric ceramic piece B will feel the sound wave signal and then amplify it through the transistor VT2,
and then inject it into the base of VT1 from C6, causing the collector potential of VT1 to drop instantly; if you do not clap your hands, but touch it with your fingers. When the electrode
piece M is turned on, the AC leakage from the human body is injected into the base of VT1 through R4 and R5. The positive half cycle of the signal is enough to turn on the VTI, so it
can also reduce the collector potential of the VTI. Pin 2 of the time base integrated circuit A is triggered by a low level, the circuit flips over and
enters a transient state, and pin 3 outputs a high level. VS gets the trigger current from R2 and is turned on, and the lamp H lights up. At this time, the positive power supply
charges capacitor C4 through R3, causing the level of pin 6 to begin to rise. When it rises to 2[3 VDI), the transient state ends and the circuit returns to the original
stable state. Pin 3 outputs low level, vs is turned off, and the light H goes out. The circuit transient time, that is, the lighting time of lamp H, can be
estimated by the formula r;1.1R3×C4. If the components use the diagram data, it will be about 1 minute.
    The function of C2 is to resist interference and prevent the switch from
being falsely triggered by interference pulses caused by grid voltage fluctuations or switching other household appliances. This circuit uses two high-impedance resistors R5 and R6 to connect the touch piece M in series. Its purpose is to ensure the absolute personal safety of the toucher .