Exploring EVPs with the Raudive Diode Detector

 Konstantin Raudive, was a Latvian writer and intellectual who spent a lifetime researching electronic voice phenomena (EVP). In 1971, he authored “Breakthrough: An Amazing Experiment in Electronic Communication with the Dead”, which is considered authoritative on the subject.

Konstantin Raudive

This hard to find book is the documented result of six years of scientific research into the phenomenon, accidentally discovered in Sweden in 1957 by the father of EVP, Friedrich Jorgenson. It includes transcripts of several EVP sessions along with a technical discussion on the methods used to generate the voices.

A flexi disk vinyl of the voice recordings was originally bundled with it. Here’s a link to the full audio for your listening pleasure. If you can manage to take off your pareidolia hat, it’s pretty amazing.

He describes four different approaches, but I find the “diode” method the most compelling as it’s supposed to capture the clearest voices. The book includes three different schematics below:

An excerpt from the book:

The diode method. A short (6-10 cm long) aerial is used to give a more or less broad-banded signal, which is rectified by a diode and fed directly by cable to the radio or microphone input of the tape-recorder.

This provides the clearest voices, but the interference caused by nearby strong wireless transmitters must be reckoned with.

In this day and age, “reckoning with wireless transmitters” sounds like a bit of a hopeless cause. Putting any doubts aside, I found with a quick search that there are more than a few schematics available for updated versions of this detector. I found the Raudive Diode Detector section from this link has a particularly nice write up and schematic. My plan is to build and test a device using this:

I’ll provide an update once I build the device. In the meanwhile, if you’ve captured EVPs, drop me a note and let me know about your hardware setup and experiences!

Through the Ages: EVP Devices Then and Now

The DailyGrail explores the surprisingly robust history of spirit communication devices in their recent post titled Ghost Boxes and Psycho-Phones. From the pre-cursor Ouija boards to current day smartphone apps there’s been a long fascination with capturing voices from the beyond.

As an engineer what I find fascinating is the application of technology. The different approaches used through the ages to “record and hear the voices”.

As mentioned in the article, a 1995 Popular Mechanics article actually categorized the different approaches that can be used, and was the inspiration behind the modern day Spirit Box.

The piece listed four basic ways in which technology could be used “to record and hear the voices” – the Microphone Method, Radio Method, White Noise Method, and the Diode Method. The author, Konstantinos, presented all his information in the typical Popular Electronics style, with little or no mysticism: this was a simple How-To, guaranteed to yield results provided the instructions were followed correctly. 

On my to-do list is to link some designs for these different methods. Have you had success or have built your own spirit communication device? Drop me an email and let me know!