Photoelectric control bird song circuit

This circuit consists of a monostable timing circuit composed of lcl (NE555), and uses
a 3DU5 photosensitive transistor to receive light. When a light
beam passes through the light-transmitting window of 3DU5, 3DU5
is turned on, triggering the ② pin of IC1 to become low level.
Therefore, pin ③ is a high-level output, enabling IC2 to be powered.
Since the trigger terminal is directly connected to the negative pole of the power supply,
11C2 is triggered by the negative pulse and works, so
a burst of birdsong is emitted from speaker B. At the same
time, LED1 and LED2 also light up, like two small eyes shining. This state lasts approximately 45 seconds depending on the selection of components in the figure. If you want to
hear the birdsong longer, just increase the island or G. 1C2 is a KD-156 soft-packed music integrated circuit chip. There are two sounds in the memory,
one is the "ding dong" ringtone, and the other is the bird's cry. As long as the trigger terminal is connected to the negative trigger type, it will be the bird's cry. Pay attention when making.