The above circuit is been
corrected on 7/5/2012
|The complete touch
switch circuit is shown below.
The remote capacitance sensor circuit is placed inside a small
potting shell, which contained a three screw terminal block and a single turn
The variable resistor allowed
the capacitance needed to activate the switch to be set from about 10pf to 170pF.
The whole sensor assembly
measured just about a half inch cube and could easily fit neatly inside the end of
the hand rail.
The two buttons were connected
in parallel, so touching either button would toggle the flip/flop.