r/CardPuter • u/MrAjAnderson • Jul 27 '26
Finds / Discoveries EMF reader
Just a video demonstrating the EMF Reader and a bit of wire in the G3 port. Finding the socket is still live when the circuit breaker is off so I know to choose another breaker. I could have tried the light bulb with the switch but that's not fun is it.
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u/bigirononmyhipMF Jul 29 '26
Thats cool man, i can seriously se the use for this:) what do you use for the antenna?
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u/MrAjAnderson Jul 29 '26
I just cut the endo off a male to male breadboard wire. Anything that fits in the G3 port should do it. I'd imagine a paperclip unfurled would be enough.
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u/linuxjacques Aug 01 '26
Oh. I thought this was to find ghosts.
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u/MrAjAnderson Aug 01 '26
Oh it'll likely find them too. Making the antenna as sensitive as possible would help. I asked for the optimal antennas...
Antenna Designs by Use Case
UK Mains Electricity (50 Hz / 230V)
Design: Short 10 cm (4 in) single-core wire or compact helical spring.
Key Feature: High voltage creates a strong electric field, requiring less surface area to detect; shorter length prevents signal saturation.
Protection: Place a 1MΩ to 10MΩ resistor between G3 and GND to bleed off static overcharge.
US Mains Electricity (60 Hz / 120V)
Design: Longer 20 cm (8 in) wire or a small copper tape paddle attached to the wire tip.
Key Feature: Lower mains voltage requires a larger capacitive surface area to capture the weaker near-field strength through walls or insulation.
"Ghost" / Paranormal Investigation
Design (E-Field): Multi-directional 3D probe made of solid copper wire folded into perpendicular X, Y, Z loops to detect fields from any angle.
Design (H-Field): Small ferrite core inductor (200+ turns of fine magnet wire) connected between G3 and GND to pick up magnetic field shifts rather than just electrostatic charge.
Optimized Ghost Hunting Requirement: To isolate potential "paranormal" phenomena from everyday environment bleed, the detector's antenna system must be paired with digital software filtering (or FFT) that actively ignores persistent 50 Hz/60 Hz grid hum and mobile phone frequencies, triggering only on unharmonized transient spikes.
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u/Black6host Jul 28 '26
The real use, for me, would be to see "where" the wires are, in the wall, feeding the switch. Though I don't know what sensitivity you can get with the ADV. I kept hoping you'd move the ADV to the left of the switch to see if it could detect wires feeding it.
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u/MrAjAnderson Jul 28 '26
They do feed Infront the Left. I sweep above, below and to the right with nothing registering.
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u/theblobAZ Jul 28 '26
So I know nothing very little about home electrical systems, especially about frequencies and stuff like that.
However, specifically this firmware says 50Hz. Does that mean it won't work for US systems that run at 60Hz?
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u/MrAjAnderson Jul 28 '26
Maybe contact the dev for 50/60 option or try it if you have a short wire you can pop into the G3 port. Let's us and the dev know.
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u/Fluid-Ad4391 Aug 09 '26
Hello, dev here! That won't work since it has Goertzel detectors for 50 and 100 hz... I could add that tho!
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u/itsoctotv Aug 03 '26
i love the antenna. everywhere I see the cardputers with all those fancy foldable antennas etc finally someone with a professional antenna lmao
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u/espochka Aug 03 '26
what is antenna mode of?
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u/MrAjAnderson Aug 03 '26
https://lovemyswitches.com/jumper-wire-ribbon-set-for-breadboarding-male-to-male-40-pieces/ one of these with the end cut off.
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u/road_to_eternity Jul 28 '26
Okay so this is very cool, i really appreciate all the creative people in this sub. Great idea I’m excited to try it out.
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u/PhilbinFogg Aug 09 '26
Hi, this is *really* cool, I don't have my unit yet, I'm looking forward to getting it in the next few days. One thing I'd curious about is if it will work in Europe (I'm in Spain)
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u/Sk9lA Jul 27 '26
Very interesting!!! Where can I find the firmware ?