How to toggle relay with single push-button
Very simple circuit. Its key link is the popular NE555 timer chip. It is she who registers the keystroke and sets the output to either logical 1 or 0. Button S1 - any button to close without latching
Source: https://sdelaysam-svoimirukami.ru/4282-vklyuchenie-i-vyklyuchenie-nagruzki-odnoy-knopkoy.html