Objective: To build a shielded cable with a passive low pass filter to be used for connecting the ground connection of a typical US 120V socket or from an earth ground rod to a bed sheet with silver threads in it for grounding or earthing purposes. The purpose is for the filter to eliminate any/all AC noise from going up the shielded cable and getting to the bed sheet.
For testing possible filter configurations I have a Fluke 179 True RMS multimeter and an old Hitachi V-152F-15MHz Oscope and a BK 3011B - 2 MHz Function generator.
My thoughts are to use a single resistor with an electrolytic capacitor so when measured with the multimeter in one direction I would measure the resistor value and in the other direction I would measure an infinite impedance.
I have explored several online low pass filter calculators:
www.redcrab-software.com/.../RC-Low-Pass-Filter
sim.okawa-denshi.jp/.../CRlowkeisan.htm
learningaboutelectronics.com/.../Low-pass-filter-calculator.php
markimicrowave.com/.../
I have a few questions:
1. Do I make the filter with a cutoff frequency of 60Hz or something very low like 1Hz or less?
2. Is an RC filter best or use an RLC or some other config?
3. Could the filter be better with a 2nd order (or 3rd, or 4th ...?).
4. For the filter connected to a shielded cable, are surface mount components better to use than leaded components?
Thank You!!
