1. The problem statement, all variables and given/known data Converting a 50kHz high pass filter to a 5.3kHz high pass filter. The circuit: 2. Relevant equations Working out the Capacitance, C, and Resistance, R, of the circuit in order to work out the cut-off frequency, Cf, using: Cf = 1/(2*pi*R*C) 3. The attempt at a solution I've managed to work out how to get to the 50kHz Cf, (R=63.63 ohm, and C=5e-8 F) But I don't know what to do in order to get the 5.3kHz Cf, should I adjust just the value of C, or R or both ? What is the most sensible thing to do to preserve the signal quality ? and circuit safety. NOTE: this is not a homework question but more a hobby exercise.