how can i edit the 555-timer astable mode in order to get a larger span of duty cycles passing by values below 50%? D = tH/T= (R1 + R2)/(R1 + 2R2) this is the equation, by changing the values of R1 and R2 I get a maximum span of 50% how can I edit the 555 timer to make the span 60%. (duty cycle to vary between 40% and 100%)
Once I achieve duty cycle less than 50% can i add a notification Light Emitting Diode (LED) in the circuit that will be ON when the duty cycle is larger than 50% and it will go OFF when the duty cycle is below 50%. if yes how can I achieve that?