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Does anyone remember the formula for the rise/fall time for a sine wave...?

I thought I could calculate it but I did it wrong apparently

t1.

[tex]V_o sin(2*\pi*f*t)=.1 V_o [/tex]

[tex]\frac{arcsin(.1)}{2 \pi f} [/tex]

t2.

[tex]V_o sin(2*\pi*f*t)=.9 V_o [/tex]

[tex]\frac{arcsin(.9)}{2 \pi f} [/tex]

t2-t1...

but that isn't right

I thought I could calculate it but I did it wrong apparently

t1.

[tex]V_o sin(2*\pi*f*t)=.1 V_o [/tex]

[tex]\frac{arcsin(.1)}{2 \pi f} [/tex]

t2.

[tex]V_o sin(2*\pi*f*t)=.9 V_o [/tex]

[tex]\frac{arcsin(.9)}{2 \pi f} [/tex]

t2-t1...

but that isn't right

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