Based on the 556 chip constitutes a loop catching chick game machine circuit

Single chip microcomputer STM32L151CCU6

There are two 555 time base circuits inside the 556. Because they are packaged in one chip, better consistency can be achieved. The other 556 is a bipolar circuit with large output drive capability, output current up to 200MA, and operating frequency range up to 01001Hz to 500kHz.