After i had tried making the resistors very high values, many
megs actually, and making the capacitors as high as i had, that
could be used in that circuit, i soon decided that to get higher
values of capacitance i would have to use condensers, or
electrolytic capacitors as they are now known.
The problem here is that electrolytics are uni-directional,
unlike the ones in all the circuits i could find, which are A.C.
working.
So i tried staggering them, with one up, and one down, so as to
keep the uni directional voltage, and also pass the signal,
like this: