The power supply diagram of the toy gun is shown in the figure below: It mainly uses a large-scale CMos integrated circuit CW9899 or HC898, in which the crystal triode VT6 is used to amplify the signal, VT1~VT5 is used to drive the small electric beads to light up, and R1 is an external oscillation resistor. When the 3V power supply is turned on, when the switch SB is pressed, the speaker BL will emit a rifle sound, and the sound will stop when the SB is disconnected. It can also change a sound, such as a bomb, and so on. Its feature is that one switch can emit 8 simulated sounds. That is, when the SB is pressed once, a sound can be changed in turn, and when it is pressed for the 9th time, it will start the cycle from the beginning. Another feature of it is that the five ultra-small electric beads can emit light synchronously according to the changes in the simulated sound.
Reference address：Design and schematic diagram of 8-sound 5-flash toy gun
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