Electronic Formula

• Astable 


  T = 1.44/(R1+2R2)C
• Frequency (Hertz)


  f = 1/T
• Monostable 


  T = 1.1 x R x C
• Transistor Gain 


  Hfe = Ic/Ib
• Voltage Divider 


  V out = V in x (R2/R1 + R2)
• Resistors in Series 


  Rt = R1 + R2 + Rn
• Resistors in parallel


  Rt = R1 x R2/(R1 + R2)
• Power rating


  P = VI
• Voltage


  V = IR