I'm interested in listening to extremely low frequency band below 100Hz, where the famous Schumann resonances reside. I will use a large T shape antenna together with a very low noise, very high impedance preamplifier. This is my current draft of the preamplifier:
C2 is the SA102A100JARC 10pF ceramic through-hole capacitor. R2 is the SM102035007FE 5GOhm through-hole resistor. C3 is an SMD ALU electrolythic capacitor. The goal is to have a -3dB LP cutoff at 100Hz and as low as possible HP -3dB cutoff (~ 1Hz). VCC is 5 volts. The next stage would probably be a 50Hz twin T notch filter. I would appreciate if you guys can do a quick check of the circuit and maybe suggest some enchancements :) Thanks !
P.S.: R2 and C2 are through-hole because of the guard ring and easier control of the leakage current.