10A/250VAC 1 CO Relay; No False Triggering; Well, I decided I would not stop here. ... a 5V relay is wired between the output of the timer chip and the ground rail, ... 0 comments on “ Updated 555 ...

The 5V relay (SRD-05VDC-SL-C) operates from the regulated 3.3V DC supply; This V4.0 module has three 10KΩ pull-up resistors (RESET/GPIO0/CH_PD) A PC817 optocoupler drives the relay control MOSFET ...