I am trying to use a monostable 555 timer circuit to control a peristaltic pump. But, the timer duration is not consistent. I replaced the fet and motor with LEDs and the timer behaves as expected (on for ~10s with the pot at 1 Mohm). What else do I need to have the timer drive the fet properly?
555 timer with MOSFET and motor/pump
555 timer with LEDs
555 timer with MOSFET and motor/pump
555 timer with LEDs