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Ghost Microphone
The recording of ghost voices is known as electronic voice phenomena, or EVP for short.  
Unexplainable voices being heard during the use of electronic devices was discovered as
early as the 1930's, though it's been said that Nikola Tesla might have been the first to
notice disembodied voices in 1898 being transmitted by his Colorado radio tower. This
might have been the first ghost microphone to have been unwittingly invented. Later,
scientists would come along who devoted their time to diligently record and document
their findings about ghost voices.  The first to make
EVP recordings was Friedrich

As legend would have it, in 1959 the Swedish film producer was outdoors recording bird
calls when he discovered hearing his deceased mother's voice speaking to him upon
playback of the audio tape.  This led to Juergenson experimenting with EVP and, over
time, recording hundreds of ghost voices.  He is now considered to be the “father of EVP.”

Fascinated by the work of Juergenson, Latvian psychologist Dr. Konstantin Raudive
began his own EVP experiments.  He would eventually record and study thousands of
disembodied voices, creating a system of classification for electronic voice phenomena in
order to rate the quality and clarity of the messages.

During his experiments, he solicited help in building a microphone to enhance his EVP
experiments.  Using a Germanium Diode as an external microphone, he found he received greater results.  More ghost voices were recorded. Incredibly, those who have
experimented with the Raudive Diode claim that the device will not allow your audio
recorder to record human voices, even if people are talking in the same room!

A Germanium Diode picks up AM radio frequencies so, when using one to record EVP, it
should be placed inside a
Faraday Cage.  A Faraday Cage is used to block all outside
AM radio transmissions from reaching the
ghost microphone.
Above: The Raudive Diode schematic. L1 = .5mh
coil, R1 = 100k resistor, D1 = 1N34A germanium
The above schematic is the design used by Dr. Raudive to record ghost voices.

Another method of using the Germanium Diode that's achieved success is to simply
attach one to a microphone jack and plug it directly into your digital audio recorder.  
using an older, cassette tape recorder, you will need to use a connecting wire placed
between the recorder and diode to keep it away from the motor noise which may cause
interference.  This set-up makes it easier to incorporate the Faraday Cage.

When using a digital recorder, you may need to cover the external microphone if it does
not disengage automatically.  It will depend on your recorder, as the power level of the
diode is quite low and may not signal the audio recorder to switch from the internal
microphone to an external one. Also, because you might be unable to incorporate a
Faraday Cage using this technique, you will need to be wary of radio broadcasts, limiting
positive results to only credible phrased answers to questions. One word, irrelevant
responses should not be considered. This will reduce the chance of AM radio snippets
being mistaken for EVP in your recording.

In the future, we hope to be able to create and offer some
Ghost Microphones for
purchase.  Check with the
Fringe Technology Store for updates.
Angels & Ghosts!
Ghost Microphone Copyright 2010 Angels & Ghosts, LLC