Touch switch again

[Ingo Debus]

Hi,

some time ago I posted a touch switch circuit. It turned out that this
circuit doesn't work as well as it seemed first, especially if someone
is touching several touch pads at the same time.
The circuit relies on the mains hum which is fed into the input when
someone touches it, which of course varies a lot.

So, if someone wants to build this circuit, be warned. Perhaps it works
ok it is assured that the person touches a contact with ground potential
at the same time.

Ingo