Используйте приложение APKPure
Историческую версию 555 Timer Project Free можно получить на Android
Это приложение обеспечит пример 555 Timer Circuit
This application provide the circuit for 555 Timer IC .It can be use for student or engineer as an reference when use 555 Timer.Not just that it also can be combine with your electronic projects and circuits .This application do not need internet to working.Thank you