In 1980, William O'Neil constructed an electronic audio device called "The Spiricom." O'Neil claimed the device was built to specifications which he received psychically from George Mueller, a scientist who had died six years previously. At a Washington, DC press conference on April 6, 1982, O'Neil stated that he was able to hold two-way conversations with spirits through the Spiricom device, and provided the design specifications to researchers for free. However, nobody is known to have replicated the results O'Neil claimed using their own Spiricom devices.[O'Neil's partner, retired industrialist George Meek, attributed O'Neil's success, and the inability of others to replicate it, to O'Neil's mediumistic abilities forming part of the loop that made the system work.
Another electronic device specifically constructed in an attempt to capture EVP is "Frank's Box" or the "Ghost Box". Created in 2002 by EVP enthusiast Frank Sumption for supposed real-time communication with the dead, Sumption claims he received his design instructions from the spirit world. The device is described as a combination white noise generator and AM radio receiver modified to sweep back and forth through the AM band selecting split-second snippets of sound. Critics of the device say its effect is subjective and incapable of being replicated, and since it relies on radio noise, any meaningful response a user gets is purely coincidental, or simply the result of pareidolia.
Source: http://en.wikipedia.org/wiki/Electronic_voice_phenomenon#Spiricom_.26_Frank.27s_Box
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