*version 9.1 2878029043
u 846
U? 5
V? 4
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PM? 2
D? 24
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@graphics
t 781 t 6 130 310 660 390 0 191
Trigger SCHMITT:   beta=R2/(R2+R3) =.5

CASO SIMMETRICO:   T=R1C1*ln((1+beta)/(1-beta)=R1C1*ln(1.5/.5)=0.005*ln(3)=.005*1.1=0.0055=SEMIPERIODO   

FREQUENZA= 1/(2*0.0055) = 90.909090...Hz