View single post by EVPDave
 Posted: Dec 15th, 2010 06:05 PM
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EVPDave

 

Joined: Mar 7th, 2007
Location: USA
Posts: 206
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 This design came to me a month ago and I finally put the hardware together to try it. It is a simple feedback loop using both radio (RF) and light. I knew there would be a feedback sound but I was surprised to hear the distinctive RF feedback sound v.s. acoustical feedback. RF feedback has a hollow tone to it.

The device is touchy to set up and is operated in a dark room. The photomultiplier tube I used is very sensitive to modulations of light.

Out of a minute of distorted voices I could only understand one message and it's not that great. I will post a block diagram of the device after this post.

"The Bausch and Lomb inceptor" 

Attachment: 121510thebauchandlombinceptor.mp3 (Downloaded 1099 times)