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Registered Member #5323
Joined: Fri Jun 15 2012, 02:14PM
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Posts: 104
I placed a 2 ft insulated wire with exposed pointy tip nearby the vent of an Ionic Breeze (negative ion generator) and can scavenge enough airborne ions to light an LED (ref my Oct 1st 2012 post). The subject of this new post is that I want to figure out how to filter out RFI and AC from the wire to ensure that ions are indeed the source of power that is illuminating the LED. Said differently, I wonder if some of the energy that is lighting the LED could be coming from RFI or inductively coupled AC generated by the Ionic Breeze HV circuitry (the pointy tip of the wire is only a few inches away from the Ionic Breeze vent). I'd like to filter out AC and radio wave energy from the 2 ft wire, allowing only HV DC to pass. I assume an inductor/cap combo could filter out most of the AC and RFI, but have no idea what values to try.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
An L.C filter has a self-resonant frequency which COULD enhance pickup of ac/rf etc I would use a high value resistor (e.g. 1 MOhm) and a low leakage capacitor (metalised film (mylar/MKT/MMKT) or foi/film (KS/KP) etc.) of say 0.1 uF which gives a cutoff frequency of 1.6 Hz, well below anything internally generated. OR place a sheet of paper/plastic between the ion generator and the probe, which should 'block' the ions, so if you still get current it's not from the ions.
Registered Member #5323
Joined: Fri Jun 15 2012, 02:14PM
Location:
Posts: 104
Sulaiman:
I would like to try the cap and resistor approach, but am a bit unclear. Please describe the configuration that you suggest I connect the 0.1uF and 1Meg Ohm resistor. Thanks.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Connect the capacitor across the led, and the resistor in series between the probe/wire and the led//capacitor. OR with no resistance, capacitance or inductance, try reversing the polarity of the led, if it lights one way and not the other then you know it's dc not ac.
Registered Member #5323
Joined: Fri Jun 15 2012, 02:14PM
Location:
Posts: 104
Thank you much for the suggestions, I will try them.
Revisiting the idea of using an inductor as a filter (no capacitor), is there an inductor value that if placed between the probe wire and LED that might do a good job of attenuating RFI and AC??
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Not a practical value since the source impedance is so high you would need unrealistically high inductance. Putting an inductor between the wire probe and the led forms a resonant circuit (inductance of the inductor and capacitance of the wire) which would filter out most frequencies BUT enhance others.
Since you are collecting micro-amperes a 1 MOhm series resistor would only drop a few volts, negligible compared to the kilovolts available from the source.
Registered Member #5323
Joined: Fri Jun 15 2012, 02:14PM
Location:
Posts: 104
Sulaiman:
I tried your LED test. Here are the results.
The LED illuminates in only one polarity direction. When I reverse the LED polarity, it does not illuminate. I suppose this eliminates AC coupling as a possible source of energy, that leaves only the RFI possibility to consider.
How about using a choke like these to filter the RFI?
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Seek help filtering out RFI and AC from probe wire
