My problem is:

I have made a simple high pass filter (first order) which is just a series combination of a capacitor and a resistor of values 100pf and 35kohm resp.

so, by using the formula of cutoff frequency fc = 1/(2*pie*r*c), i found that the cutoff frequency of my circuit is 45.5khz (approx). Now, I want to reduce this cutoff frequency without changing the values of R and C. I want to know that how can we do that

**with the help of transistors or opamps**.

P.S. : I don't want to connect capacitors and resistors in parallel to these C and R of my high pass filter .......REPLY ASAP!!

THANK U IN ADVANCE!!