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In Reply to: RE: DIY Compression Driver Experiment posted by Paul Scearce on March 04, 2015 at 18:10:14
Paul,
Any photos? I'd like to see how to do compression drivers. Do you use a phase plug?
Follow Ups:
I didn't take too many construction photos. Sorry. I found one of the front part of the compression chamber/phase plug. The diaphragm is a straight sided cone, suspended at the outer edge and driven from the inner edge. It is formed around the phase plug, and is held about .2mm-.3mm away from it. I wanted to keep the front volume as small as practical.
There is a conical plug glued inside the piece pictured, with the tip at the exit of the driver. All of the sound is directed through the radial slits shown, into the expanding chamber that is formed by this front piece and the conical plug.
Joseph Merhaut designed and patented an electrostatic compression driver. I have always found that flat stock and flat things are easier for the DIY'er to build than round things. you might want to track down his patent it is based on very simple but precision flat electrostatic panel and a not too difficult phase plug' Here is just one of Joseph's books. Joseph was Europe's equivalent to Harry Olson. Nice work glad to see you working on such a project sure you will inspire others as well to do so. Best regards Moray James.
books.google.ca/books/about/Theory_of_electroacoustics.html?id=ml7bAAAAIAAJ&edir_esc=y
moray james
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