I would like a slow PWM output, driving a relay turning an AC heating element on and off. I desire a period time of around 10s.
What is a realistic upper period time limit for a PWM circuit like the one found here?
According to EveryCircuit, a 100 kOhm potentiometer and 100 uF C1 capacitor should leave me with my desired ~10s period time, but I suspect noise could become an issue with resistances so large and period times so slow.