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I want to build a timer, limited to 5 hrs, for my NiCad charger which runs
on 120VAC. I understand that a 555 IC and a properly sized capacitor and
resistor will provide the timing. How do I connect this to AC? Relay?
Anyone have a schematic? Maybe it would be easier to build a decent charger
that won't damage the batteries?


Five hours is much too long for a standard 555 IC. You'd better buy a time
switch. The simple mechanical ones can be set by the quarter. Switch it on
by hand and place an off stop only at the time you want to swich off.

petrus bitbyter