Eli Bartlit

I built the circuit based off Eddy Bergman’s design.

(link to page here: https://www.eddybergman.com/2019/05/electro-magnetic-field-detector.html )

You should look definitely look at his website as it is the source material for the schematic below:

Reading from right to left the first 4 transistors serve as an antenna amplifier

After some playing around and purchasing some working LEDs, I stuffed it in a metal box.

Here’s an internal view where you can see the BC547 NPN BJTs.

Internal layout (I later added a BNC adapter to the antenna)

I used a bulkhead BNC connector to allow for multiple antenna geometries (or easy replacement of broken antennas).

Here’s the final look.

If the LED positions have too much character for you, I’m sorry (I just started drilling).

While I wouldn’t rely on this for any serious measurements of electromagnetic interference. It’s a fun gizmer. I tell my goth friends that it’s a ghost detector, I tell my engineering friends it’s a toy. I tell myself that it might actually be of some use detecting unwanted breakdown during my high voltage projects.