Use NE555 to make voice-controlled music lanterns

The circuit of the voice-controlled music lantern is shown in Figure 3-15. The circuit consists of a transducer, an audio voltage amplifier, a monostable trigger,
a thyristor switching circuit and a power supply circuit.
    VDI, VD2, Cl, and C2 form a simple capacitor step-down half-wave rectifier circuit, which outputs about 12V DC voltage for use by
  the entire control circuit. Piezoelectric ceramic sheet B is an acoustic-electric transducer, which can convert environmental sound wave signals into corresponding electrical signals.
  The transistor VT is the audio voltage amplification. The time base circuit NE555, R3, and C3 form a monostable trigger with extremely short transient time, and
  its transient time t=ll R3×03 =123.42 us. LED, R4 and vs form the lantern driving circuit.
    Adjust the potentiometer RP so that the voltage at pin 2 of the integrated block NE555 is slightly higher than 1/3 VDD, and the time base circuit is in a stable state. Pin 3
  outputs low level, vs is turned off, and the colored light string H does not light up. When the indoor music sound waves are transmitted to the piezoelectric ceramic piece B, the audio voltage is induced at both ends of it
  , and is invertedly amplified by the transistor VT, causing the level of pin 2 of the time base circuit to fluctuate around 1/3 VDD. When the potential
  ≤ 1 /3 VD, A enters the transient state, pin 3 outputs high level, the LED lights up, vs is turned on by being touched, and the colored lamp H is powered on and emits light.
  Since A's philosophical state was very short-lived, it quickly returned to the steady state and the colored lights went out. In other words, there will be no retention
  phenomenon . It can change with the level of pin 2 of the integrated block A, that is, the intensity of the sound wave sensed by the marrow B. Adjust the value of the potentiometer RP
  to adjust the sound control sensitivity of the circuit.