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For a rough estimation, assume RV1 in center position, ignore diode voltage drop, use formula for astable operation in data sheet (R1=1k, R2=5k).
RV1 center position, 10k/2 is effective R2 value (ignoring the diode voltage drop).
frequency of your circuit is:
1/((R2+k*Rv1)+(1-k)*Rv1)
where 'k' as per figure is 0.41
frequency of your circuit is:
1/((R2+k*Rv1)+(1-k)*Rv1)
where 'k' as per figure is 0.41
But by using your equation the frequency will be : 9 * 10^(-5) Hz !!