555 Retriggerable Timing Resistor Calculation

Calculations

# console.log(getResistorForTime(1));   // → "273.1"   (≈ 273 kΩ for 1 minute)
# console.log(getResistorForTime(5));   // → "1365.4"  (≈ 1.365 MΩ for 5 minutes)
# console.log(getResistorForTime(10));  // → "2730.7"  (≈ 2.73 MΩ for 10 minutes)

aimedTimeInMinutes = 3
# for 200uF 
(300000 * aimedTimeInMinutes / log(3) /1000 ) kohm to kohm


# for 470uF 
# https://everycircuit.com/circuit/6350777354813440/retriggerable-monoflop
(4.2*60*1000 / (470 * log(3))  )kohm to kohm

# 20 kohm => 14s
# 80 kohm => 46s
# 300 k.  => 4 min






# 70 kohm => 37s
# 260 kohm => 
# 350 kohm => 3 minutes
# 470 kohm => 3:46 minutes - empirical value