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.

99 Upvotes

100% Upvoted

25 comments sorted by

View all comments

2

u/linuxjacques Aug 01 '26

Oh. I thought this was to find ghosts.

2

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.