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Ic 555

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Not sure of the absolute minimum, as it would depend on the 555 type (cmos?) and the leakage on the capacitor, but I've seen charts out 100 second periods for a monostable, so I would say...0.005 Hertz

Ken
 
Delays of up to a few of miniutes are possible which translates in to about 2mHz.
 
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