What type of touch pad? Capacitive? Resistive? Single button? Multiple buttons? Smartphone type touch screen? How are you sensing the touch: generating a signal that is passed through the touch back to the pad or sensing ambinet noise and mains hum? Please give us a bit more information about your application to guide our advice to you. :) In the meanwhile, you may get some clues from this: http://doras.dcu.ie/20201/1/MastersCorrectionsFinal.pdf

Capacitive input like in a touch lamp to generate an input to a circuit of some type.

Here's one way to do it: <https://easyeda.com/file_view_Capacitive-touch-switch-01_XA60UcuMG.htm> from: <https://easyeda.com/project_view_Projects-for-beginners_tqkewO60i.htm> :)

TY I will take a look at these.