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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
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
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