For low distortion operation, the diaphragm must operate with a constant charge on its surface, rather than with a constant voltage. The grids are driven by the audio signal; front and rear grid are driven in antiphase. As a result, a uniform electrostatic field proportional to the audio signal is produced between both grids. This causes a force to be exerted on the charged diaphragm, and its resulting movement drives the air on either side of it.
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Add to Cart By Roger R. Sanders An encyclopedic exploration of the important issues, tradeoffs, and technical questions involved in building these fascinating speakers. Offers construction advice for both flat and curved panels. Includes a curved cell design by Barry McClune.
Hearing music via such a device often turns ordinary music listeners into dedicated, passionate partisans of this transducer format as the only true path to accurate sound reproduction. Add to this the additional incentive that such speakers can be constructed out of readily available materials, and the convert turns into a devotee ready to invest quantities of time and energy into the nearest equivalent of the perfect loudspeaker.
The ability to move a panel of graphite-impregnated plastic immersed in a high-voltage field with an audio signal has fascinated audiophiles since the earliest days of high-quality sound reproduction after World War II.
Then there is the electrostatic headphone sideshow which beckons tantalizingly. No one writing about the electrostatic has contributed more to the success of amateur electrostatic speaker builders than Roger R. His first article on the topic appeared in The Audio Amateur in pp. His designs were inspired to some extent, and informed by, the pioneering work of David Hermeyer, who published a series of Audio Amateur articles on building electrostatics, along with power amplifiers designed to drive them.
Electrostatic speaker builders have strong opinions about ideal formats, stator structure, polarizing voltages, and many other details. In this book, the author surveys all the alternatives and keeps clear about his own preferences, many of which are subjective. The Electrostatic Speaker Design Cookbook is a complete guide for the novice and the experienced builder to successfully build this unusual sound reproduction device.
As always, any project in electronic design is a series of choices balanced between goals and limitations. Sanders does an outstanding job of exploring the compromises and tradeoffs required to reach a satisfying result.
Roger Sanders not only builds electrostatic speakers, he builds and holds patents on a number of other devices, his unique bicycle pedal being only one of them. He is also an amateur astronomer and a frequent contributor to periodicals dedicated to that topic. Sanders has founded an interest group for electrostatic enthusiasts with a worldwide membership.
He also makes his address available in this volume for any who need help solving problems, finding materials, or just friendly conversation about one of his favorite topics.
Electrostatic Loudspeaker Design Cookbook
August 3, If you have an interest in audio there are plenty of opportunities for home construction of hi-fi equipment. You can make yourself an amplifier which will be as good as any available commercially, and plenty of the sources you might plug into it can also come into being on your bench. There will always be some pieces of hi-fi equipment which while not impossible to make will be very difficult for you to replicate yourself. Either their complexity will render construction too difficult as might be the case with for example a CD player, or as with a moving-coil loudspeaker the quality you could reasonably achieve would struggle match that of the commercial equivalent.
Electrostatic Loudspeakers: High End HiFi You Can Build Yourself