Circuit project: LED flasher circuit
Parts:
• R1 = 1 K-ohm (1000 ohms)
• C = 2.2 uF (.0000022 Farads)
• R3, R4 = 110 ohms
• R2 =CALCULATED BELOW
Calculate correct value for R2:
• Choose flash rate: F = 8 hertz (or cycle/sec)
• With F, R1, and C you calculate the R2 needed:
R2 = [(1.44 / ( F x C)) – R1] / 2
R2 = 40,409.09 OHMS
R2= [(1.44 / ( 8 x .0000022)) – 1000] / 2
R2= [(1.44 / 0.0000176) – 1000] / 2
R2= [(81,818.18) – 1000] / 2
R2= [80,818.18] / 2
R2= 40,409.09
• R1 = 1 K-ohm (1000 ohms)
• C = 2.2 uF (.0000022 Farads)
• R3, R4 = 110 ohms
• R2 =CALCULATED BELOW
Calculate correct value for R2:
• Choose flash rate: F = 8 hertz (or cycle/sec)
• With F, R1, and C you calculate the R2 needed:
R2 = [(1.44 / ( F x C)) – R1] / 2
R2 = 40,409.09 OHMS
R2= [(1.44 / ( 8 x .0000022)) – 1000] / 2
R2= [(1.44 / 0.0000176) – 1000] / 2
R2= [(81,818.18) – 1000] / 2
R2= [80,818.18] / 2
R2= 40,409.09