I have an interesting problem. I have a mains circuit that looks like this:

mains---110VAC--+ on/off switch +-------------------+ load
+----------mains return

The load is a regular incandescent light. I need to insert a 5V device
in series with the switch. The problem is that when the switch is off,
then the device also goes off. I have heard that leakage current could
be a way to still have a mostly functional switch and still be able to
provide power to the 5V device. But I haven't been able to find any
designs/circuits that show this. Anyone have any advice?

Jim
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