legacy wiki page NE555 - https://www.electrodragon.com/w/NE555
- button CTR - rest NE555 chip * (?)
- button RST - reset timer
- potentiometer - delay ctrl
- LED opt - indicator relay status
calculation
Delay time = T＝1.1RC.
For example,
capacitor 47uf and
trim pot potentiometer 500K
T = 1.1 * 500 000 * 0.000047=25.85 seconds. (Max. )
- to change the delay time, tune the potentiometer
- default capacitor - 47uf
Demos
https://twitter.com/electro_phoenix/status/1658391696416321536