I have this idea for an instrument/art project... a touch-sensitive flute organ. The idea requires air-valves that open & close based on weather or not a piece of metal is being touched. I've found a number of touch switch schematics online but I think they are toggles... touch once and the switch is on, touch it again and it is off... kind of like those touch controlled lamps that were popular in the 80's. The circuit I need would work similar, but the switch is on only while the metal is being touched. Is that possible?
Thanks for your time,
-Scott