have read this post: B&O Beomaster 3500n reborn with Arylic and sensi-touch
sorry you have read this, but the pnp transistor is not in your schematic…!!!
My guess is that the hi/low states of the TTP223 are affecting the resistance required at R1, this maybe why Jareen added additional components.
YouTube has some tutorials on the touch sensor, maybe worth a watch.
Thank you @Steve1 let me try this out
Work this solution for you? new schematic from you? thanks for all other user, best jörg