555

Do you want help with 555 in one of these areas? Here are quick options. Tell me which you prefer (or say a different topic):

• Math properties of 555

  • Factorization: 555 = 3 × 5 × 37
  • Divisibility: divisible by 3 and 5 (and by 15): 555/15 = 37
  • Bases: binary 555 = 1000101011₂; Roman numeral = DLV; base-7: 1422₇

• 555 timer IC (electronics)

  • Astable mode: f ≈ 1.44 / ((R_A + 2 R_B) C); duty cycle D = (R_A + R_B) / (R_A + 2 R_B)
  • Monostable mode: t_on = 1.1 R C
  • Want a quick example problem worked out?

• Or something else (e.g., a coding problem, history numeral, etc.)

If you want, I can give a short practice problem and solution right away. Which area should we focus on?