Discrete 555 timer on BJT

I made the original 555 chip using discrete components, and design a printed circuit board for the assembly of the 555 timer on 26 BJT. This is great educational project. This is not a competitor to the mad scientist discrete 555 timer board, but they are very similar. Link to easyEda project : https://easyeda.com/kisly.va/big-555 0:00 Creating comparators :: Создание компараторов 0:28 Voltage divider by 3 :: Делитель напряжения 0:38 Creating trigger :: Создание триггера 0:55 Work on the output stage :: Работа над выходным каскадом 2:39 PCB design :: разработка печатной платы 7:25 Creation of contact areas :: Создание контактных площадок #ne555 #timer #easyeda