Use 5GM168 to make novel voice-controlled music lanterns

The circuit of the voice-activated music lantern
controller is shown in Figure 2-111. It consists of three major parts: power circuit, control circuit and audio amplifier .
    The power circuit consists of VD1~VD4, R1, C1, LEDI and LED2.
After the 220V AC power is bridge-rectified by VD1~VD4, it outputs full-wave pulsating DC power to power the 4-way light bulbs H1-H4. This pulsating direct current is also reduced by Rl and
limited by current to make LED1 and LED2 emit light. The light-emitting tube has two functions here: - it is used as a working power supply indicator for the controller, and
the second is to use its forward voltage reduction when it is turned on, about 2x1.6V. After being filtered by cl, a stable DC power is output to supply power to integrated block A.
    The control circuit is mainly composed of integrated circuit A and thyristors VS1~VS4. A uses 5G M168. After power on, its
pins 2-5 can output high level, which are added to the gates of VSI~VS4 through resistors R4~R7 to control the conduction
angle of the thyristor to make the lantern HI —H4 two-two shining jumps in pairs (that is, the mandarin duck jumping cycle method). R3+RI' and C2 are
the external oscillation resistor and capacitor of the integrated block. Adjusting RP can change the oscillation frequency of the voltage-controlled oscillator inside the integrated block, so
the flashing cycle frequency of the colored lights can be adjusted.
    The audio amplifier is composed of VT and other components. Its power supply is taken from the DC voltage of about 3.2V at both ends of Cl. R2 and C4 form
a decoupling circuit, which can further reduce the AC ripple coefficient of the power supply. Microphone B picks up the surrounding environment sound wave signal and enters
the base of VT from c5 for amplification. The amplified audio signal is sent from the collector output through C3 to the audio voltage control input end of the integrated block, which is pin 8.
After internal rectification and amplification, the oscillation frequency of the voltage-controlled oscillator is controlled. Therefore, the cyclic flashing frequency of the lamp is also affected by
the strength of the audio signal picked up by microphone B. The stronger the sound wave signal picked up by B, the faster the lantern jumps; otherwise, the slower the speed.