This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED, generate tone, and thousands of other great beginning projects. Google around for a huge list of resources and example projects. https://elecena.pl/product/17117074/555-timer 2020-08-14 https://elecena.pl/product/17117074/555-timer 2022-02-21 https://elecena.pl/product/17117074/555-timer 2025-04-11 https://elecena.pl/product/17117074/555-timer 2025-04-14 https://elecena.pl/product/17117074/555-timer 2025-04-16